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Are brown fused alumina and silicon carbide the same product? What's the difference?
Latest company news about Are brown fused alumina and silicon carbide the same product? What's the difference?

  Some people will call brown corundum silicon carbide, and think that the two are a kind of product with the same use in all aspects. In fact, this is wrong. Brown corundum and silicon carbide are two different abrasives.


Different raw materials of brown corundum and silicon carbide:


  Brown corundum: Commonly known as carbon corundum, it is a brown artificial corundum formed by melting and reducing alumina, carbon materials and iron filings in an electric arc furnace. Therefore, it is called "brown corundum". Its main chemical composition is alumina, its content is 95%≤97%, and it contains a small amount of iron, silicon, titanium, etc. Brown corundum is the basic abrasive, which is used because of its good grinding performance, wide application range and low price.

  Silicon carbide is also a rare mineral in nature - cyanite. Silicon carbide is also known as silicon carbon. Due to its small natural content, silicon carbide is mainly man-made. The usual method is to mix quartz sand with coke, use quartz sand and petroleum coke, add salt and sawdust, put it in an electric furnace, heat it to about 2000°C, and undergo various chemical treatments to obtain silicon carbide micropowder.


Different uses of brown corundum and silicon carbide:


  Brown corundum abrasives can be used for ceramics, resin high-consolidation abrasives, grinding, polishing, sandblasting, precision casting, etc., and can also be used to manufacture refractory materials.

  Silicon carbide has four main application areas, namely functional ceramics, advanced refractories, abrasives and metallurgical raw materials. Brown corundum abrasive


The different properties of brown corundum and silicon carbide:


  Brown fused alumina has the characteristics of high purity, good crystallinity, strong fluidity, low linear expansion coefficient, and corrosion resistance. It is only suitable for removing burrs on the surface of hardware parts such as stainless steel, carbon steel, and aluminum alloy. There are two basic varieties of silicon carbide, black silicon carbide and green silicon carbide, which belong to α-SiC.


(1) Black silicon carbide contains above 95% silicon carbide, and its toughness is higher than that of green silicon carbide. It is mainly used for processing low tensile strength materials such as glass, ceramics, stone, refractory materials, cast iron, and non-ferrous metals.


(2) Green silicon carbide contains more than 97% SiC and has good self-sharpness. It is mainly used for precision grinding of hard alloy, titanium alloy, optical glass, honing sleeve and high-speed steel tool. In addition, there is cubic silicon carbide, which is a special process of yellow-green crystal. This abrasive tool is suitable for superfinishing of bearings, and the surface roughness can be processed from Ra32~0.16 micron to Ra0.04~0.02 micron.

Pub Time : 2022-10-08 20:55:18 >> News list
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