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What is titanium boreide?
Titanium boride is the most stable of all the compounds containing boron or titanium. It has a C32-structure and is combined as valence bonds. It is a hexagonal metalloid. The crystal structure is composed of a and C. a is 0.302 nm. In the crystal, the boron and titanium atoms alternately form a network structure in which the B and 3 other B are covalently-bonded and an extra electron forms a strong p bond. This graphite like layered structure between boron electrons and Ti outer layers determines TiB2’s metallic luster, good conductivity and high hardness.
Castables and the influence of the added titanium boride
The carbon in the injectable material can improve the corrosion resistance of the materials, reduce structural cracking, and increase thermal shock stability. Castables will suffer from carbon oxidation. TiB2 is widely used in ceramics, corundum, and other materials. It has shown good results. However, it has not been studied as much in castables. The effect of TiB2 additive on the properties iron trough castables was studied for this reason.
ASC iron-ditch castings were prepared to increase the oxidation resistance using brown corundum particles fused with SiC powder, white powder corundum and a-Al2O3 as well as silicon powder. The white powder of corundum was substituted with titanium boride, in different mass fractions, of 0, 0.5%, 1%, 1.5%, and 2.0%, and its influence on the properties of castable was investigated. The results show with an increase in the amount of TiB2, the linear change after 3 hours at 1000 or 1500 first decreases then increases. Bulk density increases then decreases. Appearance porosity decreases then increases. The flexural and oxidation resistance increase and decrease in order. Addition of TiB2 at 1% (w) can give the highest high-temperature flexural resistance. Addition of 1% (w) to TiB2 can improve the comprehensive index.
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