The main compound of red corundum is α-alumina, also known as chrome corundum and ruby. The market is generally artificial red fused alumina.
Red fused alumina adds 22% chromium to the base of white corundum and is made by electric arc furnace melting. The color is purple-red. The hardness is slightly higher than that of brown corundum, similar to white corundum, and the microhardness can be 2200-2300Kg/mm2. Toughness is higher than white corundum and slightly lower than brown corundum. The grinding tools made of the same are suitable for grinding high carbon steel, high speed steel and thin wall parts thereof, and the abrasive can also be used for grinding, polishing materials, precision casting sand, spraying materials, chemical catalyst carrier, special ceramics, advanced refractory materials and the like.
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