Often heard some friends ask what is black corundum, black corundum is not black silicon carbide, black corundum is good or corundum good question, simply write an article to elaborate on the difference between black corundum and black silicon carbide.
First of all, we look at Baidu Encyclopedia of the definition of black corundum:
Black corundum, also known as low aluminum corundum, is an ash-black crystalline body mainly composed of alpha-Al2O3 and iron spinel obtained by melting bauxite in an electric arc furnace, and is characterized by lower Al2O3 content , And contains a certain amount of Fe2O3 (about 10%) exists, which has moderate hardness, high toughness, high temperature, thermal stability of the characteristics. It is mainly used for polishing and sandblasting of stainless steel, metal products, optical glass and bamboo products. It is also a novel abrasive for making resin grinding wheel, cutting sheet and emery cloth.
Second, we look at the definition of black silicon carbide Baidu encyclopedia:
Black silicon carbide is quartz sand, stone tar and high-quality silica as the main raw material, high temperature smelting resistance furnace. Its hardness between corundum and diamond, the mechanical strength higher than corundum, crisp and sharp.
Silicon carbide is mainly composed of SiC, black silicon carbide containing about 95% SiC, its toughness is higher than green silicon carbide, mostly used for processing low tensile strength materials such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals .
Finally, we summarize some of the statements about black corundum:
1, black silicon carbide Mohs hardness 9.2, black corundum Mohs hardness 9.0-9.1, black silicon carbide slightly brittle;
2, black corundum, corundum and black silicon carbide is not good or bad points, mainly to see where it applies;
3, black corundum is not cubic boron nitride, cubic boron nitride molecular formula is BN.
