What is titanium diboride?
Titanium diboride powders are gray or gray-black and have a hexagonal (AlB2) crystal structure. Titanium diboride melting point is 2980℃, which has a very high hardness. The antioxidation temperature of titanium diboride can reach 1000℃ in air, and it is stable in HCl and HF acids. Titanium diboride is mainly used to prepare composite ceramic products. Because it can resist the corrosion of molten metal, it can be used in the manufacture of molten metal crucibles and electrolytic pool electrodes.
What is the crystal structure of titanium Diboride?
Titanium diboride (TiB2) is the most stable compound of boron and titanium. It has a C32 structure and is bound by its valence bond. It is a hexagonal quasi-metallic compound. In the crystal structure, the boron atomic plane and titanium atomic plane appear alternately to form a two-dimensional network structure, in which B combines with the other three B to form a covalent bond, and an extra electron forms a large π bond. The layered structure of boron atoms, which is similar to graphite, and the electrons in the outer layer of Ti determine that TiB2 has good electrical conductivity and metallic luster, while the Ti-B bond between the boron atomic surface and the titanium atomic surface determines the high hardness and brittleness of this material.
Properties of titanium diboride:
Among many compounds, metal borides have better high-temperature properties than metal carbides. For example, diboride (TiB2) cermet products are more suitable for use under high temperatures and high erosion conditions than titanium carbide (TiC) and tungsten carbide (WC) cermet products.
Titanium diboride powder is gray (or gray-black), and the oxidation resistance temperature in the air can reach 1100℃, as a new type of ceramic material, has very excellent physical and chemical properties, in addition to the melting point is very high hardness, chemical stability, electrical and thermal conductivity, mechanical and mechanical properties at high temperature are excellent.
What is titanium Diboride used for?
Titanium diboride and its composites can be combined with other metals and ceramic-based polymers to form a series of new materials with commercial application value.
(1) Titanium diboride can be used as a grain refining and particle strengthening additive. It can greatly improve the mechanical, mechanical and physical and chemical properties of the aluminum base, copper base titanium aluminum alloy and iron base materials. The effect of grain refinement and particle strengthening will be increased with the increase of purity and fineness of titanium diboride powder.
② Titanium diboride can be combined with silicon carbide, aluminum nitride, boron nitride, titanium carbide and another non-oxide ceramic composite, can also be combined with alumina and other oxide ceramic materials, after a large number of experimental studies show that the preparation of new composite material has more excellent mechanical strength and rupture toughness, can make one of the high-quality materials of armor protection materials.
③ Titanium diboride particles mixed with high-performance resin can be made into PTC heating ceramics and head PTC materials, it has the characteristics of safety, power saving, reliability, easy processing and forming, is a key high-tech renewal of household appliances such as electric iron, electric blanket, electric oven, air conditioner hot air heating room.
④ Titanium diboride has excellent electrical conductivity and excellent corrosion resistance to melting metal and can be used to make evaporation vessels, melting metal crucibles, aluminum electrolytic cell cathodes, spark plugs and other electrode and contact starting materials.
⑤ Because of the good wettability of titanium diboride and liquid aluminum, using titanium diboride as the cathode coating material can reduce the power consumption of aluminum electrolytic cells and prolong the life of the aluminum electrolytic cells.
⑥ Titanium diboride can be used to make ceramic cutting tools and molds. It can manufacture finishing tool, drawing die, extrusion dies, blasting nozzle, sealing element, etc.
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