Does Tantalum Have a High Resistance to Corrosion?

Corrosion Resistance of Tantalum

Tantalum has very good corrosion resistance in most inorganic acids, is very similar to glass, and has important uses in the chemical industry. It is resistant to almost all chemical media (including hydrochloric acid at boiling point, nitric acid, and sulfuric acid below 175°C) except hydrofluoric acid, fluorine, fuming sulfuric acid, and alkalis.

tantalum corrosion resistance

Tantalum has excellent corrosion resistance to dilute sulfuric acid below 75% and can be used at any temperature; it can be used at 160~170℃ for concentrated sulfuric acid without inflating; it can be used at 250~260℃ for concentrated sulfuric acid with inflating, and the corrosion increases beyond this temperature. Generally in more than 170 ℃ high-temperature use before the first test research. Tantalum also has good corrosion resistance to phosphoric acid, but if the acid contains a trace of fluorine (>4ppm), the corrosion rate increases.

Tantalum is usually not resistant to corrosion in alkali, it becomes brittle and corrodes more quickly at high temperatures and concentrations.

Tantalum can react with high-temperature gas, O2, N2, H2, etc. can penetrate into the internal to make it brittle, such as contact with the initial ecological H, which will also absorb hydrogen and become brittle. Therefore, tantalum equipment should not be in contact with more reactive metals (such as Fe, Al, Zn), because it is easy to constitute a tantalum-iron (Al, Zn) primary battery, and the hydrogen generated by the primary battery reaction will destroy the tantalum cathode and make the equipment fail.

If a small piece of platinum is connected to tantalum with a very small over-voltage of hydrogen, then all the hydrogen will be released on the platinum and the destruction of tantalum by hydrogen can be avoided.

Tantalum has excellent corrosion resistance but is expensive, so its applications are mainly in the form of composite plates and linings, and in order to reduce costs, the thickness of the tantalum layer wants to be as thin as possible, so composite plates or lining welding is very difficult, because the melting point of tantalum and steel is very different, (the melting point of tantalum is 2996 ℃, the melting point of steel is 1400 ℃) and Fe and Ta at high temperatures will form Fe2Ta brittle Intermetallic compounds if the measures are not appropriate, it is easy to lead to cracking of the weld.

The performance of tantalum capacitors

Tantalum electrolytic capacitors have excellent performance and are small in size among all capacitors but can achieve large electric capacity, so they are easy to be made into small chip components suitable for surface mounting.

The tantalum capacitors currently produced are sintered solid, foil-wound solid, and sintered liquid, of which sintered solid accounts for more than 95% of the total production at present, and the non-metal sealed resin package is the main body.

Tantalum electrolytic produces the working environment medium for capacitors is an extremely thin layer of tantalum pentoxide film that is generated on the surface of tantalum metal material. This layer of the oxide film medium is combined with one of the terminals that make up the capacitor as a whole and cannot exist alone, so the electric capacity per unit volume is particularly large, i.e., the specific capacity is very high, so it is particularly suitable for miniaturization.

During the operation of the tantalum electrolytic capacitor, it has the performance of automatic repair or isolation of oxide film defects, so that the oxide film dielectric is strengthened at any time and its proper insulation capacity is restored without continuous accumulation of damage. This performance with unique self-healing technology ensures the advantage of long life and reliability.

What are the Main Uses of Tantalum?

What are the basic uses of tantalum?

1 Tantalum is used to make tantalum capacitors: tantalum carbide powder and tantalum wire are the key materials for making tantalum capacitors, and they are excellent capacitors. Niobium can also be used to make capacitors.

ta powder

2 Tantalum is used to make high-temperature resistant tantalum products: tantalum can withstand high temperatures, has good strength, and rigidity, and is a high-quality material for making heating parts, heat insulation parts, and charging vessels for vacuum high-temperature furnaces.

3 Tantalum niobium is used to make corrosion-resistant tantalum niobium products: Tantalum niobium is a high-quality material resistant to acid and alkali and liquid metal corrosion and can be used in the chemical industry to make boilers, heaters, coolers, various vessel devices, etc.

4 tantalum niobium in the aerospace industry: used in the production of aerospace aircraft, rockets, submarines, and other engine components, such as combustion chambers, combustion ducts, turbine pumps, etc. Such as WC-103 Nb-Hf-Ti high-temperature niobium-based alloy is a high-quality material for astronautics, used as rocket gas pedal nozzle, spacecraft propulsion powering device and nozzle valve, etc.

5 Tantalum used to make the lining of armor-piercing ammunition: the application is currently mainly in the United States, is a missile, such as TOW2B missile.

6 Tantalum carbide as additives to cemented carbide: cemented carbide is mainly used as tools, tools, molds, and wear-resistant corrosion-resistant structural components, adding TaC can improve its hardness, strength, melting point, etc. NbC can also be used, the performance is second to TaC.

7 Niobium is the main additive for steel. The addition of niobium micro-alloyed steel, and steel grain refinement, can improve the strength and toughness of steel, about 75% of niobium applications in the field.

8 Niobium used as superconducting materials: Nb-Ti alloy is today’s widely used *, the amount of * large superconducting materials, such as Nb47Ti, there are important applications in high-energy physics, is the large hadron collider, heavy ion collider, and other high-energy particle gas pedal * selected practical superconducting materials; Nb3Sn is second only to Nb-Ti practical superconducting materials.

9 Tantalum oxide, and niobium oxide is the raw material for making tantalum-niobium artificial crystal: Ta2O5, Nb2O5 is the raw material for making LT, LN and other crystals, LT, LN is an important piezoelectric, thermoelectric and nonlinear optical materials, in the laser and micro-acoustic surface wave and other technical fields have important uses.

10 Niobium in the atomic energy industry: Nb has a small neutron capture cross-section, high thermal conductivity, and strength, and is used in atomic energy reactors as a nuclear fuel cladding material, nuclear fuel alloy additive, and heat exchanger structural material.

11 other applications: cathode sputtering tantalum coating, high vacuum suction pump tantalum active material, Nb2O5 and Ta2O5 for optical glass modifiers and chemical catalysts, Ta, Nb in medical devices and arts and crafts applications, etc.

Why is Tantalum So Valuable?

Properties of tantalum

Tantalum has a series of excellent characteristics such as a high melting point, low vapor pressure, good cold processing performance, high chemical stability, strong resistance to liquid metal and acid and alkali corrosion, and large dielectric constant of the surface oxide film, which makes it an important modern functional material.

tantalum wire

Tantalum rapidly generates a surface oxide film that closely covers its metallic substrate in almost any environment, which is extremely thin and dense, impervious to almost all media, and self-healing once damaged. Thanks to this excellent protective film, tantalum has extremely good corrosion resistance. Except for fluorine, hydrofluoric acid, acidic solutions containing fluorine ions, fuming nitric acid, and strong alkalis, tantalum is impervious to corrosion in most media.

The main uses of tantalum

In the electronics industry, tantalum is mainly used as tantalum capacitors, which are usually applied in the form of capacitor-grade tantalum powder, tantalum wire, and tantalum foil. Tantalum capacitors are indispensable electronic components for radar, spacecraft, and missiles, and are widely used in civil applications such as mobile communication, electronic equipment, and instruments.

Tantalum powder can be made into small and large capacity capacitors because of its large specific surface area and large dielectric constant of the dielectric film, and therefore large capacity.

Electrolytic capacitors made of tantalum have the advantages of small size, lightweight, good reliability, large operating temperature range, shock resistance, and long service life. Tantalum electrolytic capacitors can be divided into solid electrolyte capacitors and liquid electrolyte capacitors according to their electrolytic degree.

Tantalum electrolytic capacitor

Capacitors can be distinguished by the form of their anodes, there are mainly two kinds of tantalum foil anodes and tantalum powder sintered anodes. Tantalum wire is used as the anode lead for these two types of capacitors. The development of the electronics industry is demanding more and more miniaturization and high reliability of tantalum capacitors. In the miniaturization of tantalum capacitors and chip types, efforts are made to increase the specific capacity of tantalum powder.

Tantalum is also used as a material for electronic tubes. Due to its high melting point, low vapor pressure, good processing properties, low coefficient of thermal expansion, and excellent gas absorption, tantalum is a good material for emitter tubes and high-power electron tube parts. Due to its high chemical stability, tantalum target is an important material for the magneto-space sputtering coating of electronic chips.

Tantalum carbide is a refractory metal, which occupies an extremely important position in cemented carbide industrial applications. Like the ceramic carbides of WC, TiC, and metallic cobalt, TaC has excellent wear resistance, toughness, hardness, and stability.

There are two types of tantalum carbide use: one is to add tantalum carbide directly to WC-Co or WC-TiC-Co alloy in small amounts, which plays a role in controlling grain growth, etc.; the other is to form a solid solution with niobium carbide or other carbides, which can improve the high-temperature hardness, high-temperature strength and oxidation resistance of the alloy, greatly improving cutting speed and extending tool life.

Ceramic carbide has excellent cutting performance, generally composed of α, γ, β three phases. α phase is tungsten carbide; β phase is the metal phase binder, metal cobalt is the most commonly used binder for ceramic carbide; γ phase is the solid solution formed by TaC, NbC, and TiC, γ phase is dissolved in tungsten carbide, its role is as a crystal generation inhibitor.

The deep processing of tantalum and its application

Tantalum has very good plasticity and is extremely easy to be processed plastic. Various industrial profiles (tantalum tube, tantalum rod, tantalum wire, tantalum strip) can be produced by using conventional processing processes (extrusion, forging, rolling, and drawing). Tantalum and tantalum alloy molten ingots have a coarse grain organization and must first be extruded or hot-forged to open the billet and break the grains before they can be further processed into the material.

Pure tantalum can be forged at room temperature to open the billet, tantalum alloy open billet temperature is generally 1100- l200 ℃. During processing, the oxidation of the tantalum alloy surface generates loose oxides and can penetrate into the alloy matrix, forming a hard permeable layer that cracks during processing. Therefore, it is important to try to protect the metal surface from oxidation during the entire machining process.

Currently, tantalum blanks are protected by salt bath heating, coating, jacketing, inert gas protection, etc. The extrusion method can produce metal tubes, bars, and profiles of different sizes; tantalum ingots can be directly forged into rolled slabs. Glass coating can be used as a lubricant; rolling of tantalum alloy plates, usually using two-roll or four-roll mills, with deformation of 10% and 15%, and total deformation of 70% and 80% when rolling 2.5mm thin plates. When rolling a 2.5mm thin plate, kerosene or palm oil is used as a lubricant.

What Products are Made of Tantalum?

Tantalum appears in many applications, including

– Sputtering barrels: Computer disk manufacturers and other industries that use sputtering processes are increasingly using tantalum to resist corrosion in sputtering barrels. The tantalum lining process is more environmentally friendly than chromium lining, helping the industry reduce its ecological impact.

tantalum

– Machined fasteners: Machined fasteners made from tantalum offer excellent corrosion resistance. They replace fasteners made from alternative materials that are prone to failure or require expensive equipment downtime for maintenance. Tantalum fasteners are found in industries such as mining, energy, and pharmaceuticals, as well as in metal and chemical processing.

– X-ray/radiation shielding: Tantalum’s radiopaque properties make it ideal for X-ray and shielding applications that seek to prevent radiation leakage. Tantalum shielding can also protect sensitive electronic components in aerospace structures as well as components operating in corrosive environments.

– Vacuum furnace heating elements: Many vacuum furnace components contain tantalum rods due to tantalum’s oxidation resistance and high melting point. Tantalum’s temperature particle stability increases the life expectancy of the machine, as it can withstand high temperatures for extended periods of time.

– Machined parts for chemical processing equipment: Tantalum’s corrosion-resistant properties make it the material of choice for machined parts for chemical processing equipment. Tantalum machined parts replace inferior materials that perform poorly in harsh chemical environments and require extensive maintenance.

 

The uses of tantalum

– 1: Tantalum carbide, used for cutting tools

– 2: Tantalum lithium, for surface acoustic waves, cell phone filters, hi-fi, and TV

– 3: Tantalum oxide, used in telescopes, cameras, lenses for cell phones and X-ray films, inkjet printers

– 4: Tantalum powder, used for tantalum capacitors in electronic circuits

– 5: Tantalum plate, used in chemical reaction equipment such as coating, valves, etc.

– 6: Tantalum wire, tantalum rod, used for repairing skeleton plates, suture frames, etc.

– 7: Tantalum ingots: used for sputtering targets, high-temperature alloys, computer hardware drive discs, and TOW-2 bomb-forming projectiles

 

Together with tungsten carbide WC and titanium carbide TIC, tantalum carbide TAC is a cemented carbide component used in cutting and drilling tools.

 

Tantalum is particularly suitable for heat exchangers; it has high thermal conductivity and its surface properties prevent the formation of adhesive deposits.

 

Manufacture of furnace components such as screens, supports, and crucibles. The alloying elements in high-temperature alloys increase high-temperature strength. It is biologically inert and can be used for implants, needles, etc. Yttrium tantalate YTAO4 is used in medical diagnostics.

 

SAM offers our customers a wide selection of tantalum rods, tubes, sheets, and wires, all designed for a variety of applications. Our products are cold rolled and annealed in a proprietary process to create machined parts with metallurgical properties ideal for applications such as sputtering gun tubes, processing into fasteners, X-ray radiation shielding, development rings, vacuum furnace heating elements, chlorinator springs, assemblies, and more for light bulbs or chemical processing equipment.

Tantalum Capacitors in the Military Industry

Why is tantalum so popular?

The most important use of tantalum is the manufacture of electronic components, especially capacitors. 50%-70% of the world’s tantalum is used to manufacture tantalum capacitors, mainly in the form of capacitor-grade tantalum powder and tantalum wire.
Because tantalum forms a dense, stable, amorphous oxide film with high dielectric strength on its surface, it forms a stable anodic oxide film in acidic electrolytes and is easy to process.

tantalum capacitors

At the same time, tantalum powder sintered blocks can obtain a large surface area in a small volume, so tantalum capacitors have a series of excellent properties such as high capacitance, low leakage current, and low equivalent series resistance, good high and low-temperature characteristics, and long service life.

Tantalum Capacitors in the Military Industry

A tantalum capacitor is called a tantalum electrolytic capacitor, which is also a kind of electrolytic capacitor, using tantalum metal as the dielectric, hence the name.

The tantalum capacitor was firstly developed by Bell Labs in 1956, and it is a passive component with a small volume and large capacity capacitor.

Tantalum capacitors’ downstream applications can be divided into two categories: military and civilian. The military field includes aviation, spaceflight, ships, weapons, and electronic countermeasures, while the civil field includes consumer electronics, industrial control, electric power equipment, new energy, communication equipment, rail transportation, medical electronics, and automotive electronics. As an essential basic electronic component in electronic circuits, capacitor products are widely used in the military and civilian fields.

Military capacitors are mainly ceramic capacitors and tantalum capacitors. The development of the military electronics industry is especially important in the context of the information-based military. It is widely used in communications, computers, automobiles, electrical appliances, aerospace, national defense, and other industrial and scientific sectors.

Why Do Electrolytic Capacitors Explode?

If you want to know why the electrolytic capacitor explodes, first you have to know what the electrolytic capacitor is. An electrolytic capacitor is a kind of capacitance. The metal foil is the positive electrode (aluminum foil or tantalum foil), and the oxide film (aluminum oxide or tantalum oxide), which is closely attached to the metal, is the dielectric. The cathode consists of conductive material, electrolyte (which can be liquid or solid), and other materials. Because the electrolyte is the main part of the cathode, the electrolytic capacitor is hence named. At the same time, the capacitance of the electrolytic capacitor cannot be connected wrongly.

capacitors explode

Tantalum electrolytic capacitor mainly consists of sintering solid, foil winding solid, sintering liquid, and so on. The sintered solids account for more than 95% of the current production and are mainly composed of non-metallic sealed resin.

The aluminum electrolytic capacitor can be divided into four types: the lead type aluminum electrolytic capacitor; Horn type aluminum electrolytic capacitor; Bolted aluminum electrolytic capacitor; Solid aluminum electrolytic capacitor.

The possible reasons for the capacitor explosion are as follows:

  1. The breakdown of the internal components of the capacitor is mainly due to the poor manufacturing process.
  2. The capacitor is damaged by insulation to the shell. The high voltage side of the capacitor is made of a thin steel sheet. If the manufacturing process is poor, the edge is uneven with burr or serious bend. The tip is prone to corona, and the corona causes the breakdown of oil, the expansion of the case and the drop of oil. In addition, when the cover is closed, if the welding time is too long, the internal insulation burns and produces oil and gas, causing the voltage to drop greatly and damage.
  3. Poor sealing and oil leakage. The insulation resistance is reduced due to the poor sealing of the assembly casing. Or the oil spill caused the oil surface to drop, resulting in the extreme shell direction discharge or component breakdown.
  4. The belly and the inside dissociate. Due to the internal corona, breakdown discharge, and serious dissociation, under the action of overvoltage, the starting free voltage of the element is reduced to the working electric field intensity. This causes the physical, chemical and electrical effects to accelerate the aging and decomposition of the insulation, producing gas and forming a vicious circle, the pressure of the case is increased, causing the drum to explode
  5. A capacitor explodes with an electric charge. All capacitors with rated voltages are forbidden to be charged. Each time the capacitor bank recloses, the capacitor must be discharged for 3min after the switch is disconnected. Otherwise, the voltage polarity of the closing moment may be caused by the opposite polarity of the residual charge on the capacitor. For this purpose, a capacitor bank with a capacity of more than 160kvar is generally required, and automatic tripping device should be installed when there is no pressure. And the capacitor bank switches are not allowed to install automatic reclosing.

In addition, it may be caused by high temperature, poor ventilation, high operating voltage, excessive voltage harmonic component or operating overvoltage, etc.

Stanford Advanced Materials (SAM) is a leading supplier and manufacturer of high-quality capacitor grade tantalum powder and tantalum wire with competitive price and great delivery time. Please visit http://www.samaterials.com for more information.

What Are the Advantages of Tantalum Electrolytic Capacitors

Tantalum electrolytic capacitors are widely used in communications, computers, aerospace, and military, as well as advanced electronic systems, portable digital products, and other fields.

tantalum electrolytic capacitors

Tantalum electrolytic capacitor is made of tantalum (Ta) metal as anode material, which can be divided into foil type and tantalum powder sintered type according to different anode structures. Among tantalum powder sintered tantalum capacitors, there are tantalum capacitors with solid electrolytes and tantalum capacitors with non-solid electrolytes due to different electrolytes. The shell of tantalum electrolytic capacitors is marked with CA, but the symbol in the circuit is the same as that of other electrolytic capacitors. Compared with aluminum electrolytic capacitors, tantalum electrolytic capacitors have the following advantages.

Tantalum-Electrolytic-Capacitors
Tantalum-Electrolytic-Capacitors

Small volume

Because tantalum electrolytic capacitors are made of very fine tantalum powder, and the dielectric constant of the tantalum oxide film is higher than that of the alumina oxide film, the capacitance per unit volume of tantalum electrolytic capacitors is large.

Wide temperature range for use

Tantalum electrolytic capacitors commonly can work normally at the temperature of -50 ℃~100 ℃. Although the aluminum electrolytic capacitor can also work in this range, its electrical performance is not as good as that of the tantalum electrolytic capacitor.

Long life, high insulation resistance, and small leakage current

Tantalum oxide film in tantalum electrolytic capacitors is not only corrosion-resistant but also can maintain good performance for a long time.

Good impedance frequency

For capacitors with poor frequency characteristics, the capacitance will drop sharply and the loss (tg delta) will also rise sharply when the working frequency is high. However, solid tantalum electrolytic capacitors can operate above 50kHz. When the frequency of the tantalum electrolytic capacitor increases, the capacity will also decrease but by a small margin. The data show that the tantalum electrolytic capacitor capacity decreases by less than 20% at 10kHz, while the aluminum electrolytic capacitor capacity decreases by more than 40%.

capacitor-tantalum

High reliability

Tantalum oxide film has stable chemical properties. In addition, Ta2O5 anode substrate of tantalum can withstand strong acid and pressure, so it can use a liquid electrolyte with low resistivity of solid or acid. In this way, tantalum electrolytic capacitors have less loss than aluminum electrolytic capacitors and have good temperature stability.

Chip tantalum electrolytic capacitors are made of highly pure and extremely small homogeneous particles, which are characterized by small size, large capacity, and high frequency. In recent years, chip tantalum electrolytic capacitors have been widely used in mobile phones, DVDs and other consumer electronic products.

Please visit http://www.samaterials.com for more information.

How are Tantalum Capacitors used in Audio and Microphone Industry?

As tantalum capacitors have become more widely used in the market, their models and supply volumes have increased and prices have started to fall. Nowadays, aluminum electrolytic capacitors are replaced by tantalum capacitors in many industries. Of course, tantalum capacitors also have their own defects, such as not having high enough pressure, which greatly limits their use area.

capacitive microphone

Tantalum is easily oxidized in the air. The tantalum capacitors made by using its oxide film as the medium have the function of repairing wounds automatically, so they are durable and reliable. The tantalum oxide film is very thin, so the distance between two plates of tantalum capacitors is very close, and the reaction is very sensitive, so the charging and discharging speed is fast. These characteristics determine that tantalum capacitors are suitable for high-frequency, low-current, and fast reactive circuits. Therefore, tantalum capacitors are widely used in satellites and other circuits requiring fast response and high reliability.

Tantalum capacitors are often used in advanced audio circuits, mainly high audio circuits, due to their high sensitivity and fast charge-discharge. As the loss of weak current to high audio is reduced, the relatively high pitch and sound quality are improved. In short, the tantalum capacitive microphone has the following advantages.

Capacitive Microphone
Capacitive Microphone

Broad frequency response

The vibrating membrane is the main component of the microphone which induces sound and converts it into an electrical signal, and the material and mechanism design of the vibrating film is an important factor to determine the sound quality of the microphone. The vibrating membrane of a capacitive microphone can be made of extremely thin material and the induced sound pressure is converted directly into an audio signal, so the bass of frequency response can extend to the ultra-low frequency below 10Hz, and the high tone can easily reach the ultrasonic waves of dozens of KHz, showing very broad frequency response characteristics.

Hypersensitivity

Because there is no load on the diaphragm, the diaphragm can be designed in such a light and thin way that the frequency response is superior and the sensitivity is excellent. It can sense extremely weak sound waves, and output the clearest, most delicate, and most accurate original sound.

Fast transient response

In addition to the characteristics that determine the frequency response and sensitivity of the microphone, the ability of the vibrating membrane to react quickly to sound waves, namely the “instantaneous response” characteristic, is one of the most important factors that affect the microphone’s timbre. The speed of the instantaneous response of the microphone depends on the weight of the whole vibrating membrane. The lighter the vibrating membrane, the faster the reaction speed. The extremely thin vibrating film of the capacitive voice head has an extremely fast transient response, so it can show a clear, energetic, and accurate timbre.

Capacitor microphone

Resistance to fall and impact

In general, the use of microphones can be caused by accidental falls and collisions. Since the capacitive head is made up of lighter plastic parts and a sturdy light metal case, the impact force on the falling ground is small and the failure rate of damage is low.

Small size and lightweight

The capacitive microphone has the advantages of small volume, lightweight, high sensitivity, and superior frequency response due to its ultra-thin vibrating membrane, so it can be designed into subminiature microphones (commonly known as small bees and small ants) and is widely used.

Please visit http://www.samaterials.com for more information.

Tantalum Capacitors VS Ceramic Capacitors

The function of capacitors is to remove the crosstalk of various high-frequency signals generated by the chip itself to other chips so that each chip module can work normally without interference. In the high frequency electronic oscillating circuit, the SMT capacitance and crystal oscillator together form an oscillating circuit to provide the required clock frequency. Its main chemical components are nickel and chromium, and the shape is filamentous, so it is called nickel-chromium wire.

tantalum capacitors

Ceramic capacitors

Ceramic capacitors are made by high dielectric constant capacitor ceramics, which are extruded into tubes, wafers, or disks as the medium. It is divided into two types: high-frequency porcelain medium and low-frequency porcelain medium. Low-frequency ceramic dielectric vessels are limited to those occasions where they are used as by-passes or dc insulation in circuits with lower operating frequencies, or where stability and loss requirements are not high. Such capacitors are not suitable for use in pulse circuits because they are vulnerable to breakdown by impulse voltage.

Ceramic Capacitors

Tantalum Capacitors

Tantalum capacitors are characterized by long life, high-temperature resistance, high accuracy and excellent performance of the high-frequency filter. Tantalum capacitors can generally withstand high temperature and voltage and are often used for high-frequency filtering. Ceramic capacitors look a bit like patch resistors, but they are smaller in capacity and more expensive than aluminum capacitors and have relatively low voltage and current resistance.

Compared with ceramic capacitors, tantalum capacitors on SMT are labeled with capacitance and pressure resistance, and the surface color is usually yellow and black. SMT aluminum electrolytic capacitors have a larger capacity than SMT tantalum capacitors, which is more commonly seen on the display card, with a capacity between 300 VPS F and 1,500 VPS F.

Tantalum_capacitors
Tantalum Capacitors

The difference between tantalum capacitors and ceramic capacitors

They are made of different materials. As the name implies, tantalum capacitors use tantalum as the medium, while ceramic capacitors use ceramics as the medium. The capacitance of ceramic capacitors is much smaller than that of tantalum capacitors. Tantalum electrolytic capacitors can achieve a small capacitance, while the ceramic capacitor can hardly achieve the ideal performance when the capacitance is large.

Tantalum capacitors and ceramic capacitors also have different uses. Tantalum capacitors can be used as coupling, and the frequency range of such circuits as filter oscillatory bypass is large, while ceramic capacitors are mostly used in high-frequency circuits. Since tantalum capacitors are mainly made of tantalum, a very rare metal, so the capacitor grade tantalum powder is very expensive, while tantalum capacitors are sold at a high price and generally used only in high-end products that are not price-sensitive.

Multilayer ceramic capacitors are now the most widely used in almost all electronic products. In recent years, the capacity of ceramic capacitors has become larger and larger with the continuous progress of technology, and 47UF multi-layer ceramic capacitors have emerged. However, the large-capacity ceramic capacitors can only be made by a few big Japanese brands, so the price is still more expensive, which is similar to the price of tantalum capacitors.

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How to Select a Tantalum Capacitor?

What is a tantalum capacitor?

At present, the tantalum capacitor is still a kind of charge energy storage device with a small volume but high capacity, and the amount of electric energy it can store depends on the thickness and area of the medium.

capacitors

The dielectric capacity of the tantalum capacitor’s dielectric layer can reach 120KV/mm, and its relative dielectric constant is 27 times 10-12 farad/meter. Therefore, tantalum capacitors can withstand extremely high field strength in a very thin medium layer, which is the root cause of their small size but high capacity. Tantalum capacitors are not only used in military communications, aerospace, and other fields, but also in industrial control, video equipment, communication instruments, electric vehicles, and other products.

Tantalum capacitors are mainly used for filtering, energy storage, and conversion, marking bypass, coupling, and decoupling and acting as the time constant elements. Pay attention to its performance characteristics in the application, and the correct use will help to give full play to its functions.

 capacitors

How to select appropriate tantalum capacitors?

To choose tantalum capacitors, the first problem is to choose encapsulation, voltage resistance, and capacitance. The capacity determines the size (encapsulation) of tantalum capacitors; on the contrary, what size determines what capacity and pressure tolerance can be achieved. According to the market, the most common problem is that engineers ignore this problem in the design process, and always want to achieve the desired parameters on the smallest device.

For example, the capacity of type A 10UF can be seen to have a withstand voltage of 4v6.3v10v20v, however, if you want to use 25V10UF, only the B type of tantalum capacitor can be used. In addition, since tantalum capacitors are used for derating, generally 70% of the capacitors need to be used, that is, the working voltage is 10V, which should be divided by 0.7. The capacitors can only be used with 16V withstand voltage.

How to purchase the original tantalum capacitors?

Due to the wide variety of electronic components and special uses, the current component market is full of fake products, dismantling and refurbishing products. The choice of a high-quality, long-term cooperation of the business is particularly important.

 capacitors

Currently, the world mainly has the following five brands of tantalum capacitors: AVX, KEMET, VISHAY, NEC, and NICHICON. Tantalum capacitors on the market are divided into two types: yellow tantalum and black tantalum. In simple terms, the black tantalum is produced by molding tantalum powder into shape, while the yellow tantalum is formed on the surface with polyoxide resin. Due to the production process, the internal space of black tantalum is not utilized most effectively, so the capacity of yellow tantalum is larger than that of black tantalum.

Please visit http://www.samaterials.com for more information.