The Characteristics of Titanium Diboride Ceramics And Preparation Method of Titanium Diboride
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Update time : 2021-09-09 09:48:49
Among many compounds, metal borides have better high temperature performance than metal carbides. For example, titanium diboride (TiB2) cermet products are more suitable than titanium carbide (TiC) and tungsten carbide (WC) cermet products to be used under high temperature and high corrosive working conditions.
The characteristics of titanium diboride as structural materials and functional materials:
1. In terms of structural materials. The high strength and hardness of titanium boride make it possible to make tools, wire-drawing films, sandblasting nozzles and hard tool materials. At the same time, it can also be an additive to composite materials.
2. Functional materials. The resistivity of titanium boride is very similar to that of pure iron, so its application in functional materials is very useful. Through the electrical properties of titanium boride, it can be made into flexible PTC materials.
The current methods for preparing titanium diboride raw materials mainly include carbothermal reduction method, self-propagating high temperature and synthesis method, mechanochemical reaction method, vapor deposition method, ball milling method and so on.
Carbothermic 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.
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. Due to the self-purification effect of the self-propagating high-temperature synthesis process, the product purity is high, so the obtained powder is easy to be further sintered, and the external energy consumption is low. If combined with other special technical means, dense titanium diboride can be directly prepared Material.
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.
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