Factors Affecting the Quality of Capacitor Grade Tantalum Powder

The powdered tantalum is dark gray or silver gray, which is an important raw material for the preparation of capacitors and tantalum materials.

The quality of capacitor grade tantalum powder used for manufacturing tantalum capacitor cores is mainly measured by its physical properties, chemical composition, and electrical properties.

Tantalum_capacitors
Tantalum Capacitors

Physical Properties

Physical properties mainly include average particle size, particle shape, fluidity and forming density. Low-pressure series products should have a small average particle size, complex grain shape, and low forming density, while high-pressure series products should have a large average particle size, simple grain shape, and high forming density. The fluidity determines whether tantalum powder can be formed by automatic forming machine. Therefore, with the rapid increase in the production of small chip tantalum capacitors, great attention has been paid to the fluidity of tantalum powder.

Chemical Composition

The chemical composition has a direct effect on the electrical properties of tantalum powder. High impurity content, especially high content of phosphorus, boron, oxygen, carbon, potassium, sodium and iron, will increase the leakage current and decrease the breakdown voltage of tantalum anodized film, so as to degrade the electrical properties of tantalum powder. However, the content of certain elements in tantalum powder is not as low as possible. It is found that adding certain selected elements can improve certain electrical properties of tantalum powder, and it has been proved that adding a small amount of phosphide to tantalum powder can inhibit the shrinkage of tantalum during sintering and thus increase the capacitance of tantalum powder by weight, while the breakdown voltage of tantalum powder can be increased by adding trace aluminum compounds with high dielectric strength.

Tantalum powder
Tantalum powder

Electrical properties

Electrical properties refer to the dc leakage current, breakdown voltage and capacitance of the oxide film on the surface of tantalum anode after weighing, pressing, vacuum sintering and anodizing of tantalum powder. All these properties are not only determined by the intrinsic characteristics of amorphous tantalum pentoxide anodized film but also closely related to the physical properties and chemical composition of tantalum powder.

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

How is the 3D Printing Tantalum Powder used in Biomedicine?

As a new manufacturing method for the global manufacturing industry, additive manufacturing caught the attention of the public six or seven years ago. And “3D printing”, a very down-to-earth and vivid name, was coined. Metal 3D printing is widely regarded as the most promising technology. Tantalum powder is an excellent biocompatible material, which has very strong biological inertia and corrosion resistance. Stanford Advanced Materials (SAM) has begun research on the application of 3D printing of tantalum powder in biomedicines such as hip joints.

tantalum-powder

Tantalum has a high boiling point, excellent resistance to corrosion, low coefficient of thermal expansion and a high coefficient of capacitance, which has been used in electronic industries. SAM’s spherical tantalum powder is a good choice for 3d printing tech as it has high purity, uniform particle size, complete surface structure, easy dispersion, large specific surface area, and high surface activity.

SAM has successfully produced a biologically inert tantalum lattice structure and can have specific and random results. These structures follow the structural rigidity of human bones and can be well combined with bone cells so that the human body can excellently accept this kind of new tissue. SAM is dedicated to providing ultra-fine tantalum powder (D50=3um, D90<10um) for bio-applications. When used for additive manufacturing and selective laser melting, this type of ultra-fine tantalum powder can always maintain structural consistency. The final surface can also be further modified. The metal properties are still very stable.

SAM has successfully produced a biologically inert tantalum lattice structure and can have specific and random results. These structures follow the structural rigidity of human bones and can be well combined with bone cells so that the human body can excellently accept this kind of new tissue. SAM is dedicated to providing ultra-fine tantalum powder for bio-applications. When used for additive manufacturing and selective laser melting, this type of ultra-fine tantalum powder can always maintain structural consistency. The final surface can also be further modified. The metal properties are still very stable.

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