The Preparation and Application of Titanium Diboride Powder
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Update time : 2021-03-02 09:18:50
Titanium diboride powder is gray or gray-black and has a hexagonal (AlB2) crystal structure. The melting point of titanium diboride is 2980°C and it has high hardness. The anti-oxidation temperature of titanium diboride in the air can reach 1000℃, and it is stable in HCl and HF acid. Titanium diboride is mainly used to prepare composite ceramic products. Because it can resist the corrosion of molten metal, titanium diboride can be used in the manufacture of molten metal crucibles and electrolytic cell electrodes.
The Preparation of Titanium Diboride
The current methods for preparing titanium diboride raw materials mainly include carbothermic reduction method, self-propagating high temperature and synthesis method, mechanochemical reaction method, vapor deposition method, ball milling method, etc.
1.Carbothermal reduction method
Using titanium and boron oxides as raw materials, carbon black as reducing agent, long-term high-temperature carbon reduction treatment in a carbon tube furnace, the purity of the synthesized titanium diboride powder depends on the purity of the raw material powder. This method is a process that is frequently used in industrial production. The disadvantage is that the obtained titanium diboride powder has a large particle size and a high impurity content.
2.Self-propagating high-temperature synthesis (SHS)
This method is generally to press the raw material mixture to be reacted into a block, and then ignite one end of the block to ignite the reaction. The huge heat released by the reaction causes the adjacent materials to react, and finally a combustion wave spreading at a speed v is formed. Finally, as the combustion wave advances, the raw material mixture is transformed into the final product. If the self-propagating high-temperature synthesis method is combined with other special technical means, a dense titanium diboride material can be directly prepared.
3.Mechanochemical reaction method (MR)
In this method, the reactant powder is placed in a high-energy ball mill, and the powder is repeatedly deformed to broken under the action of the squeezing and shearing of the grinding ball. The violent friction and collision of the ball milling medium causes the mechanical energy to be converted into chemical energy, thereby synthesizing the required reactants. Compared with the first two methods to prepare titanium diboride, the mechanochemical reaction method has the advantages of low synthesis temperature, wide source of raw materials and low cost.
The Application of Titanium Diboride
Titanium diboride and its composite materials 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 refinement and particle strengthening additive. It can be mixed into aluminum-based, copper-based titanium-aluminum alloy and iron-based materials to greatly improve the mechanical and physical properties of the material.
2.Titanium diboride can be composited with non-oxide ceramics such as silicon carbide, aluminum nitride, boron nitride, titanium carbide, etc., or can be composited with oxide ceramic materials such as alumina, and the new composite materials prepared thereby have more Excellent mechanical strength and fracture toughness, one of the high-quality materials that can be used to make armor protection materials.
3.Titanium diboride particles mixed with high-performance resin can be made into PTC heating ceramics and head-type PTC materials, which have the characteristics of safety, power saving, reliability, and easy processing and molding. They are electric irons, electric blankets, electric ovens, and air conditioners A key high-tech for the upgrading of household appliances such as hot-air heating.
4.Titanium diboride has excellent electrical conductivity and excellent resistance to molten metal corrosion. It can be used to make evaporators, molten metal crucibles, aluminum electrolytic cell cathodes, spark plugs and other electrode and contact head materials.
5. Due to the good wettability of titanium diboride and metal aluminum liquid, using titanium diboride as the cathode coating material of the aluminum electrolytic cell can reduce the power consumption of the aluminum electrolytic cell and prolong the life of the electrolytic cell.
6. Titanium diboride can be used to make ceramic cutting tools and molds. It can manufacture finishing tools, wire drawing dies, extrusion dies, sandblasting nozzles, sealing components, etc.
Luoyang Trunnano Tech Co., Ltd (TRUNNANO) is a professional titanium diboride powder with over 12 years experience in chemical products research and development. If you are looking for high quality titanium diboride powder, please feel free to contact us and send an inquiry.
