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Black corundum is silicon carbide?

Often hear some friends ask, what is the black corundum, black corundum is black silicon carbide, black corundum good or corundum good questions, just write an article to elaborate on the difference between black corundum and silicon carbide.

First of all, let's take a look at baidu encyclopedia in the definition of black corundum:

Black corundum and low aluminum corundum, is in electric arc furnace, the bauxite made by melting a is given priority to with alpha Al2O3 and spinel mineral phase of the colored crystals, its characteristic is Al2O3 content is lower, and contain a certain amount of Fe2O3 (10%), thus has moderate hardness, high toughness, high temperature resistant, the characteristics of the thermal state performance is stable. More for free grinding, such as the beat of the products before electroplating grinder coarse grinding, it is mainly used for stainless steel, metal products, optical glass, bamboo and wood products, polishing and sanding, making resin grinding wheel, cutting slices, new abrasive cloth.

Next let's look at baidu encyclopedia in the definition of black silicon carbide:

Black silicon carbide is quartz sand, stone tar and high quality silica as the main raw material, through high temperature electric resistance furnace smelting. Its hardness is between fused alumina and between diamond and mechanical strength higher than that of corundum, sharp and crisp.

Main composition for SiC, silicon carbide black silicon carbide containing SiC by about 95%, its toughness is higher than the green silicon carbide, mostly used for processing low tensile strength of material, such as glass, ceramics, stone, refractory material, cast iron and nonferrous metal, etc.

Finally we have some idea about the black corundum do a summary:

1, black silicon carbide mohs hardness 9.2, black corundum 9.0 9.1 mohs hardness, black silicon carbide is a bit fragile;

2, black corundum, corundum and black silicon carbide is not what is good or bad, basically see its application in what place;

3, black corundum is not cubic boron nitride, the formulas for cubic boron nitride BN.