The Influence of Titanium Boride on Castables

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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 0.3028nm. In the crystal, the boron and titanium atom planes alternately form a network structure in which the B and 3 other B are covalently-bonded and the extra electron is formed as a large P bond. This graphite like layered structure between boron electrons and Ti outer layers determines TiB2’s good conductivity, metallic luster, and hardness.

Castables and the influence of titanium boride addition

The carbon in the injectable material can improve the corrosion resistance of the materials, reduce structural spalling, and increase thermal shock stability. Castables will suffer from carbon oxidation. TiB2 is widely used in ceramic materials and in corundum 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 powder fused with SiC particles or fine powder. Other raw materials used included a-Al2O3 and Secar71 powders, silicon, sphere pitch, and silicon powder. The white powder of corundum was substituted with titanium boride, in different mass fractions, of 0.5%, 1.5%, and 2.0%, and its influence on the castable properties 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 first increases then decreases. Appearance porosity decreases then increases. The oxidation resistance and flexural strength increase and decrease in order. Addition of TiB2 at 1% (w) can give the highest high-temperature flexural resistance. Addition of 1% (w), TiB2, can give a sample a more comprehensive index.

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