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The Preparation Of Titanium DiborideThere are many methods that can be used to prepare titanium diboride. These include the carbothermic method of reduction, the self-propagating method at high temperature, mechanochemical method of reaction, the vapor deposition technique, and ball milling.
1.Carbothermal Reduction Method
The quality of the titanium diboride powder synthesized depends on the powder purity. This is achieved by using titanium and boron oxids as raw materials. Carbon black is used as a reducing agent. This process is widely used in industrial production. The powder obtained from this process has large particles and is high in impurities.
Self-propagating High-Temperature Synthesis (SHS)
In general, this method is to compress the raw material mixture that will be reacted and ignite one end of the resulting block. The reaction releases a huge amount of heat, which causes adjacent materials to react. Eventually a combustion waves spreading at speed v forms. As the combustion waves advance, the raw materials are transformed into the finished product. The self-propagating, high-temperature method can be combined with special technical means to produce a dense material of titanium diboride.
3. Method of mechanical reaction (MR).
The powder reactant is squished and shredded by the ball milling medium, resulting in the breaking of the powder. The ball milling medium generates chemical energy through the violent friction. Comparing the two first methods of preparing titanium dioxide, the mechanochemical reactions method has advantages such as low synthesis temperatures, a wide range of raw material sources, and low costs.
The Application of Titanium DiborideTitanium diboride can be mixed with ceramic polymers and other metals to create new materials that have commercial applications.
1.Titanium boride can serve as an additive for grain refinement or particle strengthening. It can be used to enhance the mechanical and physic properties of materials based on aluminum, copper and titanium-aluminum alloys.
It is possible to combine titanium diboride and non-oxide ceramic materials, such as silicon carbide, aluminum nitride or boron carbide. Or, it can be combined with oxide ceramics, such as alumina.
PTC head-type materials and PTC heating ceramics can be created by mixing titanium diboride powder with high performance resin. They have many advantages, such as safety, reliability, efficiency and easy processing. These include electric irons (and blankets), electric ovens (and air conditioners), and electric blankets. This is a key high-tech to upgrade household appliances like hot-air heaters.
It has an excellent electrical conductivity, and is resistant to corrosion caused by molten metallic materials. It is used for evaporators as well as aluminum electrolytic cells cathodes, electrodes, contact heads, and molten-metal crucibles.
5. Using titanium diboride for the cathode of an aluminum electrolytic battery can reduce its power consumption and extend the life span of the cell.
6. Titanium diboride may be used in the manufacture of ceramic tools and molds. It is used for the manufacture of finishing tools, wire-drawing dies extrusion dies sandblasting components etc.
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