High-temperature calcined abrasive is calcined in the raw corundum production process, and then heat treatment. Its characteristics are: the expansion coefficient is very small, excellent hydrophilicity, higher toughness, strength, to solve the abrasive in the processing of the cracks and rust appear, thus improving the accuracy of abrasive processing and grinding effect, Adapt to the production of high-grade fixed abrasive and coated abrasive.
Calcined corundum abrasives on the impact of abrasive:
1, corundum abrasive after calcination, eliminating the abnormal expansion of abrasive. As fused corundum in the refining process, the abrasive contains the bottom price of titanium oxide (TI2O3, TIO), and titanium non-oxide (TIC, TIN), which at 400-500 ℃, will further oxidation, the volume A corresponding increase in the volume of abrasive changes beyond its normal expansion. Abnormal expansion of abrasive, will lead to corundum ceramic wheel firing, the surface of the mesh cracks, resulting in a large amount of waste, and the use of calcination is the most effective means to remove abnormal expansion.
2, corundum abrasive calcined treatment, improve the toughness of the abrasive. It is found that this is due to the abrasive in the calcination process, first solid-fused in the corundum crystal T13 + is oxidized, causing lattice shrinkage, thereby increasing the compressive strength of the abrasive; followed by calcination will make up for the granulation process Medium-sized microcracks and small crystal defects, and eliminates the internal stress caused by the grain processing. Therefore, the abrasive produced by the calcined abrasive is durable and sharp, and improves the grinding performance of the abrasive.
3, corundum abrasive calcined, the hydrophilic properties of abrasives increased several times, the study found that this is due to the removal of impurities on the abrasive surface, the low melting point material is burned, good hydrophilic abrasive coated abrasives, durable Degree can be increased by 30%.
4, after calcined abrasive, as part of the iron and corundum mixed particles cracked, flat and magnetic become strong, it is easy to be magnetic separation, not only to improve the effectiveness of magnetic separation, but also in the manufacture of abrasive does not appear Rusty spots.
