What is tantalum-carbide?
Tantalum carbonide is an metallic cubic crystalline powder which forms a binary compound family with tantalum or carbon. They are metallic conductivity-sensitive, extremely hard and fragile ceramic materials. They are typically sintered to make brownish-gray, powdery forms. This belongs to the sodium-chloride cubic crystal type. Presently, tantalum carbide is used in cemented carbide sintered as a grain growth inhibitor. This significantly slows down grain growth and has a density at 14.3g/cm3.
What are the characteristics of tantalum caride?
Molecular weight: 192.956 It is a light metallic cubic-crystalline powder that belongs to the sodium chloride type cubic cristal system. Insoluble in water; insoluble or inorganic inorganic acid. Soluble in the mixture of hydrofluoric acid (nitric) acid. Decomposable. This substance is highly resistant to oxygen and melts quickly when dissolved in potassium pyrosulfate. It has high conductivity. The resistance of 30O at normal temperature is a sign that it’s superconductive.
What does tantalum carbide do?
The most common material used in human life, carbon is high-temperature resistant, thermal conductivity, chemical stability and good heat resistance. These attributes make it a key component of daily life and in the future development and application of science, technology and engineering. A crucible made from graphite has a critical role in preparation of silicon carbide crystals through physical vapor transmission. But, graphite crucibles cannot be used to grow crystals directly due to high-temperature corrosion of raw materials. Tantalum carbide can be coated on graphite to solve this problem. Tantalum carbide, a ceramic material can be produced by directly reacting tantalumi-containing compounds and carbon at high temperature. Due to its high melting points and chemical stability, Tantalum carbide is resistant to the corrosion of many chemical substances at elevated temperatures. As a coating for graphitecrucibles’ surfaces, it is able to protect, enhance the quality of crystals and lower production costs.
Due to tantalum carbide’s brittleness, and the differences in thermal expansion coefficient between coating and matrix, the bonding strength between layer and matrix is weak. The quality of the finished product can be affected by visible cracks in the coating or falling off the matrix. High adhesion coatings are therefore essential.
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