Tantalum Carbide TaC Powder Cas 12070-06-3

What is Tantalum Carbide TaC Powder ？

Tantalum carbide is a metallic cubic crystalline powder that forms a binary chemical compound family of tantalum and carbon. They are extremely hard, fragile, refractory ceramic materials with metallic conductivity. They appear as brownish-gray powders and are usually processed by sintering. It belongs to the sodium chloride type cubic crystal system. At present, tantalum carbide is also used as a cemented carbide sintered grain growth inhibitor, which significantly inhibits grain growth, with a density of 14.3g/cm3.

Tantalum carbide is insoluble in water, hardly soluble in inorganic acid, in a mixed acid of hydrofluoric acid and nitric acid, and can decompose. Strong oxidation resistance, easily melted and decomposed by potassium pyrosulfate. Tantalum carbide has high electrical conductivity, with a resistance of 30Ω at room temperature, showing superconducting properties. Tantalum carbide can be used in powder metallurgy, cutting tools, fine ceramics, chemical vapor deposition, hard wear-resistant alloy tools, tools, molds, and wear-resistant and corrosion-resistant structural components to improve the toughness of the alloy. The sintered body of tantalum carbide is golden yellow and can be used as a watch decoration.

The bond between tantalum carbide and carbon atoms is a complex mixture of ions, metals, and covalent contributions, and these carbides have very hard and brittle materials due to strong covalent components. For example, TaC has a microhardness of 1600-2000 kg/mm2 (~9μH) and an elastic modulus of 285gPa, and the corresponding values ​​of tantalum are 110kg/mm2 and 186gPa. The carbon content in TAC increases hardness, yield, and shear stress.

As an important cermet material, tantalum carbide is sometimes added to the tungsten carbide alloy when commercially used for cutting applications.

Tantalum carbide melting point: Depending on the purity and measurement conditions, the melting point of tantalum carbide reaches its peak at about 3880°C. This value is the highest value among binary compounds. Only tantalum carbide ha can have a slightly higher melting point of about 3942°C, while the melting point of carbide clam is comparable to TaC.

Tantalum carbide Properties:

Tantalum carbide TaC is an extremely hard (Mohs hardness 9-10) refractory ceramic material commercially used in tool bits for cutting tools. The diamond exceeds the hardness. 

It is a heavy, brown powder usually processed by sintering and an important cermet material. 

It is sometimes used as a fine-crystalline additive to tungsten carbide alloys. 

Tantalum carbide is the stoichiometric binary compound with the highest known melting point, at 4150 K (3880°C), and boiling point at 5500 C. 

The substoichiometric compound TaC0.89 has a higher melting point, near 4270 K (4000°C).

How is Tantalum Carbide TaC Powder produced?

The Tac powder of the desired composition is prepared by adding a mixture of heating and graphite powder in a vacuum or an inert gas atmosphere (argon). The heating was performed at about 2000 ° C using a furnace or arc melting. The alternative technology is reduced by carbon tantalum oxide in a vacuum or hydrogen atmosphere at 1500-1700 ° C. This method was used for carbonized tantalum in 1876 but lacked thermometrically controlled product control. Direct production TAC is produced directly from the component by self-propagating high-temperature synthesis.

Tantalum Carbide Uses:

The main use of tantalum carbide is carbide, capacitors, electronic devices, high-temperature components, chemical equipment, and ferrite. Carbides are typically added to tungsten carbide/cobalt (WC / CO) powder wear to enhance the physical properties of the sintering structure.

The tantalum carbide also serves as a grain growth inhibitor to prevent large particles from forming a material to produce an optimum hardness.

It is also used as steel mold coatings in aluminum alloy injection molding. While providing hard, wear-resistant surfaces, it also provides low-friction mold surfaces.

Carbides are also used to produce sharp instruments with extreme mechanical resistance and hardness. In addition, tantalum carbide can also be used in the following:

1. Cemented carbide

The tantalum carbide plays an important role in the cemented carbide, improving alloy properties by improving fibrous tissue and phase transformation kinetics, making alloys stronger, more stable, and processing deformation.

2. Electronic industry

Natunction inherits many advantages of carbide nanomaterials and has its unique side. Such as high hardness (normal temperature is 9-10, high melting point (approximately 3880 ° C), Yang's modulus (283-550 GPa), strong conductivity (32.7-117.4 μΩ · CM at 25 ° C in electrical conductivity) ), High-temperature superconducting (10.5k), anti-chemical corrosion candles and heat shock ability, highly catalytic activity of ammonia decomposition and hydrogen separation.

3. High-temperature alloy

In carbide, the melting is preferably a tantalum carbide(TAC) (melting point 3890 ° C) and carbide (HFC) (melting point 3880 ° C), followed by carbide (ZrC) (melting point 3500 ° C). These materials have excellent mechanical properties at high temperatures that greatly exceed the best polycrystalline graphite, especially carbonized, the only material that maintains certain mechanical properties in the temperature range of 2900 ° C-3200 ° C.