How do tantalum products work in modern industry?

How do tantalum products work in modern industry?

Capacitor tantalum powder

Tantalum electrolytic capacitor is an electronic device that takes tantalum as a metal anode and generates dielectric oxide film on the tantalum surface by anodic oxidation. The most important difference between tantalum capacitors and other types of capacitors is the quality of the tantalum oxide dielectric film, which has a high dielectric constant and breakdown voltage.

Generally speaking, the higher the purity of tantalum powder, the higher the breakdown voltage of the tantalum capacitor anode film. The tantalum powder has a high specific surface area, which can be remained even after compaction and sintering due to its special pore structure.

tantalum powder

Apart from the tantalum powder, tantalum foil is also used in foil capacitors, and tantalum wire is used as capacitor anode lead. In 2000, the annual output of tantalum capacitors reached 25 billion tons, requiring 800 tons of tantalum powder and nearly 150 tons of tantalum wire. Excellent performance such as high reliability and compactness, high efficiency, and long shelving time make tantalum capacitors be used in the instrument and control system of computers, communication systems, aircraft, missiles, ships, and weapon systems.

Tantalum and its alloys

The alloying of tantalum or tantalum-based alloy is usually carried out in the electron beam furnace. In order to obtain the ingot with uniform composition, vacuum arc remelting (VAR) is required after the smelting and purification in the electron beam furnace. All tantalum and tantalum alloy products are processed by electronic beam casting, and the use of vacuum arc remelting depends on the use of the product.

Tantalum alloy has the lowest ductile-brittle transition temperature, good low-temperature ductility, small work hardening coefficient, and excellent high-temperature strength, which is an ideal structural material for working under 1600-1800 ℃. At present, Ta-W and Ta-Nb alloy materials are mainly used in the manufacture of aerospace industry and space nuclear power system components.

Tantalum alloys

Other applications of tantalum

At present, the global annual consumption of tantalum is about 900 tons. The electronics industry is the largest and most promising application of tantalum, accounting for an estimated 66% of total consumption; the second application of tantalum is in the cutting tool industry, which accounts for 22 percent of total consumption; tantalum, as a superalloy high temperature strengthening additive, accounts for 6% of the total consumption; tantalum and tantalum alloy account for 3% of total consumption in valves, heat exchangers and plug-in heaters of chemical industries. As a biological material, tantalum is highly compatible with body fluids. In thoracic surgery, tantalum U nail is used to close vessels and arteries without an allergic reaction, and medical fields such as holes used to seal the skull during craniotomy account for about 1% of tantalum use. The other 2% of tantalum is used for military purposes.

Stanford Advanced Materials supplies high-quality tantalum products to meet our customers’ R&D and production needs. Please visit http://www.samaterials.com for more information.

Overview of the Metal Tantalum

Overview of the Metal Tantalum

Tantalum is a kind of refractory nonferrous metal with a hardness of 6-6.5. Its melting point can reach 2996 ℃, which is second only to tungsten and rhenium. Tantalum is malleable and can be drawn into thin foil, and it has a very small coefficient of thermal expansion, which is only 0.6 percent for every degree rise.

metal tantalum

Tantalum also has excellent chemical properties and is highly resistant to corrosion. Tantalum does not react with hydrochloric acid, concentrated nitric acid, and aqua regia under both cold and hot conditions. The experiments showed that tantalum did not react with the alkali solution, chlorine gas, bromine water, dilute sulfuric acid, and many other agents at room temperature, but only with hydrofluoric acid and hot concentrated sulfuric acid, which is relatively rare in metals.

Tantalum

Tantalum has a wide range of applications due to its excellent performance. For example, tantalum can be used as a substitute for stainless steel in the production of various inorganic acids. Besides that, tantalum can replace tasks that used to be undertaken by precious metal platinum in chemical, electronic, electrical, and other industries, thus greatly reducing the cost. Tantalum is manufactured into capacitor equipment for military use, and half of the world’s production of tantalum is used in tantalum capacitors. America’s military industry is unusually advanced, and it is the world’s largest arms exporter. The Defense Logistics Agency, the largest owner of tantalum, once bought a third of the world’s tantalum powder.

Tantalum is a kind of stable anodic oxide film in the acidic electrolyte. The electrolytic capacitor made of tantalum has the advantages of large capacity, small volume, and good reliability. Capacitor making is the most important use of tantalum, and the consumption of tantalum accounts for more than 2/3 at the end of the 1970s. Tantalum is also used to make electronic transmitter tubes and high-power tube parts. Moreover, Tantalum metal can be used as the structure of the combustor of the aircraft engine.

Tantalum and its alloys are widely used in all walks of life. Tantalum and tantalum-hafnium alloys are often used as heat-resistant, high-strength materials for rockets, missiles, and jet engines, as well as components for control and adjustment equipment. Tantalum is easy to be processed and shaped, so it is used as supporting accessories, heat shield, heater, and radiator in the high-temperature vacuum furnace. Tantalum carbide is used to make cemented carbide.

Boride, silicified, and nitride alloys of tantalum are used as heat release elements and liquid metal sheathing materials in the nuclear industry. Tantalum oxide is used in the manufacture of advanced optical glass and catalysts. In 1981, tantalum was consumed by about 73% of electronic components, 19% of the machinery industry, 6% of transportation, and 2% of the rest.

Stanford Advanced Materials supplies high-quality tantalum products to meet our customers’ R&D and production needs. Please visit http://www.samaterials.com for more information.

Newer Posts