Brown corundum is a brown artificial corundum produced by smelting and reducing bauxite, carbon and iron filings in an electric arc furnace. The main chemical composition of brown corundum is Al2O3, which is 95.0% and 97.00% respectively, and also contains a small amount of Fe, Si, Ti and other elements. Brown corundum is the most basic abrasive. Artificial abrasives made of white corundum have an aluminum oxide (Al2O3) content greater than 99%, and contain a small amount of iron oxide, silicon oxide and other components, and are white. So, what is the difference between brown corundum and white corundum? Let the editor of Yuanfeng Abrasives and Refractory Materials introduce it to you!

1. Different raw materials: The raw material of brown corundum is bauxite, and there are also anthracite and iron ore. The raw material of white corundum is alumina powder.

2. Different uses: Brown corundum can be used to make ceramics, resin high-consolidation abrasives, as well as grinding, polishing, sandblasting, precision casting, etc., and can also be used to make advanced refractory materials. White corundum is suitable for grinding fine-grained abrasives such as high-carbon steel, high-speed steel and stainless steel. White corundum can also be used for precision casting and advanced refractory materials.

3. Different performance: Brown corundum has the characteristics of high purity, good crystallization, strong fluidity, low linear expansion coefficient and corrosion resistance. White corundum has the characteristics of high purity, good self-sharpening, acid and alkali corrosion resistance, high temperature resistance and stable thermal performance. In comparison, the hardness of white corundum is higher than that of brown corundum.

4. Different composition: Although both brown corundum and white corundum contain alumina, the alumina content of white corundum is above 99%, and the alumina content of brown corundum is about 95%.

5. Different color: Since the alumina content of white corundum is higher than that of brown corundum, the color of white corundum is white and that of brown corundum is brown-black.

6. Different production: White corundum is produced from alumina powder (the same raw material as electrolytic aluminum), while brown corundum is produced from calcined bauxite.

7. Different users: White corundum is used by some high-end users because it has better cutting force and polishing effect. It is mostly used for carbon steel, alloy steel, malleable cast iron, hard bronze, etc., while brown corundum is commonly used in the market and is also used in large quantities in the market. It is mostly used for tempered steel, high-speed steel, high-carbon steel, etc.

White corundum has strong cutting force and is used to remove metal or non-metal burrs, pre-burrs, etc. It has the function of polishing the surface of parts and is a medium polishing abrasive. Brown corundum is used to remove burrs on the surface of hardware parts such as stainless steel, carbon steel, and aluminum alloy. The grinding of brown corundum is not as delicate and bright as white corundum.