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The Influence of Titanium Boride on Castables

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Update time : 2021-09-15 14:54:50

What is titanium boride?

Titanium boride (TiB2) is the most stable compound of boron and titanium. It has a C32 structure and is combined in the form of valence bonds. It is a metalloid compound of the hexagonal crystal system. The structural parameters of the complete crystal are: a is 0.3028 nm, and C is 0.3228 nm. In the crystal structure, the boron atom plane and the titanium atom plane alternately form a two-dimensional network structure, in which B and the other 3 B are covalently bonded, and the extra electron forms a large π bond. This graphite-like layered structure of boron atoms and Ti outer layer electrons determine the good conductivity and metallic luster of TiB2, and the Ti-B bond between the boron atomic surface and the titanium atomic surface determines the high hardness of this material And brittleness.

The influence of the amount of titanium boride added on the castable

The carbon in the injection material can prevent the slag from penetrating into the material, improve the corrosion resistance and thermal shock stability of the material, and reduce the structural spalling and cracking of the material. However, carbon oxidation will greatly reduce the performance of castables. TiB2 has been widely used and studied in ceramic materials and corundum materials, and has achieved good results, but it has been less studied in castables. For this reason, the effect of TiB2 addition on the properties of iron trough castables has been studied.

In order to improve the oxidation resistance of the castable, ASC iron ditch casting was prepared with fused brown corundum particles, SiC particles and fine powder, white corundum powder, α-Al2O3 powder, Secar71, silicon powder, spherical pitch + silicon powder as the main raw materials. The white corundum powder was replaced by titanium boride powder with mass fractions of 0, 0.5%, 1%, 1.5%, and 2%, respectively, and the influence of TiB2 addition on the properties of the castable was studied. The results show that with the increase of the amount of TiB2 added, the linear change of the sample after being held at 1000 and 1500 ℃ for 3 h first decreases and then increases, the bulk density first increases and then decreases, the apparent porosity first decreases and then increases. The flexural strength first increases and then decreases, and the oxidation resistance first increases and then decreases. When TiB2 is added to 1% (w), the maximum high-temperature flexural strength can be obtained. When TiB2 is added with 1% (w), the sample can get a better comprehensive index.

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