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Properties and application of titanium carbide ceramics

wallpapers News 2020-05-12
Titanium carbide ceramics are typical transition metal carbides. Its bond is composed of ionic bonds, covalent bonds, and metal bonds mixed in the same crystal structure, so TiC has many unique properties. The structure of the crystal determines the essential characteristics of TiC, such as high hardness, high melting point, wear resistance, and electrical conductivity.

Titanium carbide TiC ceramics are face-centered cubic crystal type, high melting point, good thermal conductivity, high hardness, excellent chemical stability, no hydrolysis, high-temperature oxidation resistance, does not react with acid at room temperature, but in nitric acid and hydrofluoric acid. It can dissolve in the mixed acid and form nitride at 1000 ℃ under the nitrogen atmosphere.

1. Multiphase materials: Titanium carbide ceramics are superhard tool materials. TiC can be made with TiN, WC, Al2O3, and other raw materials to make various types of multiphase ceramic materials. These materials have a high melting point, high hardness, and excellent chemical stability. The preferred material for cutting tools and wear parts. Titanium carbide-based cermets are not used for the crescent-like wear of steel and have good oxidation resistance, so they are used for the cutting of high-speed wire guide wheels and carbon steel. Multiphase ceramic tools containing titanium carbide have been widely used.

2. Coating material: As a surface coating, titanium carbide is an extremely wear-resistant material. Some strong carbides are plated on the diamond surface by physical or chemical methods to form metals or alloys. These metals or alloys can interact with carbon atoms on the diamond surface at high temperatures to generate stable metal carbides. These carbides not only have a good bond with diamond but also can be well infiltrated by the matrix metal, thereby enhancing the adhesion between diamond and matrix metal. Depositing a titanium carbide film on the tool can increase the service life of the tool by several times.

3. In the research of nuclear fusion reactors, titanium carbide coating materials, and (TiN + TiC) composite coating materials, after chemical heat treatment, the anti-tritium penetration layer formed on the surface of titanium carbide can resist hydrogen ion irradiation and resist great Temperature gradient and thermal cycling.

4. In addition, titanium carbide can also be used to make crucibles for melting tin, lead, cadmium, zinc, and other metals; transparent titanium carbide ceramics are also good optical materials.

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