Overview of Titanium carbide
Titanium carbide, chemical formula TiC, molecular weight is 59.89. Gray metallic face-centered cubic lattice solid. Melting point 3140±90 ℃, boiling point 4820℃, relative density 4.93. Hardness is greater than 9. Insoluble in water, soluble in nitric acid and aqua regia. It is stable to air below 800℃ and eroded by air above 2000℃. It can react with pure O2 at 1150C.
Titanium carbide ceramics are typical transition metal carbides. Its bonding is made up of ionic, covalent and metallic bonds mixed in the same crystal structure, so TiC has many unique properties. The crystal structure determines the basic characteristics of TiC, such as high hardness, high melting point, wear resistance and electrical conductivity.
Preparation of titanium carbide
Method: the mixture of titanium powder and carbon obtained by hydrogen reduction TiO2 under high temperature, or by TiO2 and carbon powder mixed pressed into blocks, and then heated to 2300-2700℃ in the electric furnace and carbonized in H2 or CO atmosphere. The hard crystalline powder of TiC and titanium carbide is prepared by the reaction of titanium dioxide and carbon black at a temperature above 1800°C. It is compacted with cobalt or nickel for cutting tools and heat-resistant parts. It is lighter and less costly than tungsten carbide, but it is more brittle in cutting tools. However, when combined with tungsten carbide in the sintered carbide tool material, it reduces the tendency to create grooves in the tool.
Properties of titanium carbide
Theoretically, TiC contains 20.05% carbon and is light metallic gray. It is chemically stable and almost inert to hydrochloric and sulfuric acids. In oxidizing chemicals, such as aqua regia and nitric or hydrofluoric acid, TiC is readily soluble. It also dissolves in an alkaline oxide melt. Nitrogen forms above -1500°C when heated in a nitrogenous atmosphere. TiC is attacked by chlorine gas and tends to oxidize in air at high temperatures.
The density of TiC is 4.94 g/cm3, the Mohs hardness is 9+, the microhardness is 3200kg /mm2, and the elastic modulus is 309,706 MPa. The fracture modulus of the material sintered at 2600 ~ 3000℃ is 499.8 ~ 843.2 MPa at room temperature. The thermal modulus of fracture is 107.78-116.96mpa at 982℃ and 54.4-63.92mpa at 2200℃. TiC melting point is 3160 ° C, resistivity at room temperature is 180 ~ 250 | jQ - cm. It can be used as a conductor at high temperatures. The thermal expansion coefficient between room temperature and 593°C is 4.12 × 10-6/°F. Thermal conductivity is 0.041 CAL /cm S /°C.
Application of titanium carbide ceramics
1. Multiphase materials: titanium carbide ceramics belong to super hard tool materials, TiC can be made with TiN, WC, Al2O3 and other raw materials into various multiphase ceramic materials, these materials have a high melting point, high hardness, excellent chemical stability, is the preferred material for cutting tools, wear-resistant parts. Titanium carbide ceramics are used in the cutting of high-speed wire regulating wheels and carbon steel because of their good oxidation resistance and no crescent-shaped wear with steel. Multiphase ceramic cutting tools containing titanium carbide have been widely used.
2. Coating material: As a surface coating, titanium carbide is a very wear-resistant material. In the diamond surface by physical or chemical method coated with some strong carbides to form metal or alloy, these metals or alloys at high temperature and diamond surface carbon atoms interface reaction, the formation of stable metal carbides. These carbides can not only bond well with diamond, but also be infiltrated by matrix metal, so as to enhance the adhesion between diamond and matrix metal. By depositing titanium carbide films on the tool, the tool life can be increased several times.
3. In the research of nuclear fusion reactor, titanium carbide coating material and (TiN+ TiC) composite coating material, after chemical heat treatment, generate tritium-resistant permeability layer on the surface of titanium carbide, can resist hydrogen ion irradiation and resist a large temperature gradient and thermal cycle.
4. In addition, titanium carbide can also make smelting tin, lead, cadmium, zinc and another metal crucible; Transparent titanium carbide ceramics are also good optical materials.
Titanium carbide Supplier
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years' experience in providing super high-quality chemicals and Nanomaterials. Currently, our company has successfully developed a series of materials. The
Titanium carbide powder produced by our company has high purity, fine particle size and impurity content. For the latest
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