Corundum is bauxite, coal and iron as raw material in electric arc furnace at high temperature smelting. In the smelting process, the carbon anthracite in the silica alumina, iron oxide and titanium oxide is reduced to metallic impurities, the alloy of these metals taken together, due to its large specific gravity than the molten corundum to the bottom of settlement and corundum melt-liquid separation. Only a small amount of impurity inclusions in the corundum melting fast.
The main ingredients of mineral corundum corundum physics, trigonal system, a small amount of mineral impurities are: calcium silicate, calcium plagioclase, mullite (also known as mullite), titanium compounds, vitreous, and a small amount of iron alloy.
Corundum anti-crushing ability, anti-oxidation, corrosion resistance, good chemical stability, which is a widely used abrasive. Suitable for grinding high tensile strength of the metal materials, such as ordinary carbon steel, hard bronze, alloy steel grinding and grinding, thread and gear grinding, white fused alumina can be used for precision casting and high-grade refractory.
(2) black corundum BA
Black corundum corundum smelting methods and the same is Sanshui bauxite as raw material, add a small amount of reducing agent is made by smelting, its power consumption is about two-thirds of corundum. Black, the main chemical components: Al2O3 not less than 77%, SiO2 content of 10 ~ 12%, Fe2O3 content is 7 ~ 10%, TiO2 is about 3%, the proportion of not less than 3.61.
Black corundum with good self-sharpening, grinding, less heat, better finish machined parts for the bottom part before plating polished, aluminum and stainless steel polishing, can also be used to polish optical glass, processed timber. Due to its hydrophilic, can be used in the manufacture of sandpaper, emery cloth and resin abrasive, but also can be used for polishing paste and polishing powder. Black corundum due to iron content is high, and therefore should not be used in the manufacture of ceramic abrasive.
(3) White corundum WA
White fused alumina powder as raw materials in industry, in the arc by melting temperatures above 2000 degrees and then cooled steel. Aluminum oxide (Al2O3) content of 98%, and a small amount of iron oxide, silicon oxide and other ingredients, white.
Harder than corundum corundum, grit easily broken, sharp edges and corners, good cutting, grinding, heat a small and so on. For hard materials, heat-sensitive strong steel grinding. Such as hardened steel. High carbon steel, general high speed steel, alloy steel grinding. Mainly used for tools, cutting tools, dies, gears, threads, thin-walled parts grinding and profile grinding.
没有评论:
发表评论