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The Main Synthesis Method of Titanium Carbide

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Update time : 2021-10-13 14:55:14

What is titanium carbide?

TiC is light gray, cubic crystal system, insoluble in water, has high chemical stability, hardly reacts with hydrochloric acid and sulfuric acid, but can be dissolved in aqua regia, nitric acid and hydrofluoric acid, and also soluble in alkaline oxidation solution.

TiC is an iron gray crystal with metallic luster. It belongs to the simple cubic structure of NaCl type. The lattice constant is 0.4329 nm. The space group of Fm3m. The carbon atoms and titanium atoms between TiC are equivalent to strong covalent bonds in the lattice position. Bonded atoms, which have several properties similar to metals, such as high melting point, high boiling point and hardness, hardness second only to diamond, good thermal conductivity and electrical conductivity, and show superconductivity even at extremely low temperatures sex. Therefore, TiC is widely used in the manufacture of cermets, heat-resistant alloys, cemented carbides, anti-wear materials, high-temperature radiation materials and other high-temperature vacuum equipment.

Synthesis method of titanium carbide

Titanium dioxide and carbon black as raw materials:

The high-purity titanium dioxide and carbon black are fully mixed in proportion, and the dry powder mixture is press-formed in a hydrogen atmosphere using a horizontal carbon tube furnace or a vertical carbon tube furnace. At 19002300°C, reduction to obtain block TiC, and then pulverization to obtain titanium carbide powder product. Or using sponge titanium and carbon black as raw materials, sponge titanium (or titanium alloy, titanium waste recovered from carbide solid solution) and carbon black are fully mixed in proportion and heated to 15001700°C in a high-purity hydrogen stream. Titanium carbide.

Direct carbonization of titanium metal:

Titanium powder (reduced by sodium or decomposed from titanium hydride, less than 325 mesh) is mixed with carbon black and molded under a pressure of about 0.98 Pa. Then it was put into a graphite container and heated to 15001700°C in a stream of high-purity hydrogen to infiltrate the carbon. The reaction temperature and holding time depend on the type of raw material, particle size and reaction performance.

Gas phase reaction method:

The steam of titanium tetrachloride is mixed with hydrogen-containing hydrocarbons (methane, benzene, etc.), and then sent to the titanium carbide deposited by induction heating or other methods. The reaction precipitates titanium carbide on the substrate. The reaction conditions such as the concentration ratio of the reaction gas, the reaction temperature and the gas flow rate are different, and the form of the precipitated titanium carbide is different.

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