The calcination of brown corundum abrasive improves its hydrophilicity. The hydrophilic property of brown corundum abrasive is increased by 3.5 times after it is burned at 800 ℃ - 1350 ℃ for 2-4 hours.

Hydrophilic use of brown corundum abrasive:

Because impurities such as volatiles on the surface of brown corundum abrasive are removed, low melting point substances are burned off, and capillary phenomenon on the surface of abrasive increases. The stacking density of brown corundum abrasive decreases correspondingly, and its hydrophilicity is improved. The durability of the abrasive used for coating abrasives can be improved by about 30%. Improve the strength of abrasive tools. After calcination, impurities such as surface volatiles are removed from the abrasive, which improves the purity and cleanliness of the abrasive. Therefore, during the manufacture of the abrasive, the adhesion between the abrasive particles and the binder is improved, the amount of binder is reduced, and the strength of the abrasive is improved. The appearance and cutting ability of the abrasive tools are improved. After calcination, because the iron coated corundum abrasive grains are swollen and cracked, the magnetic substances are simply removed by magnetic separation, which reduces the content of the abrasive magnetic substances, does not appear rust spots when firing the abrasive tools, and improves the appearance and cutting ability of the abrasive tools.