Have you heard of blue brown corundum | Forum

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dingxinda9 Jan 13

Blue brown fused alumina is commonly known as blue fused alumina. The color of brown fused alumina is a reproducible quality mark for consumers and manufacturers of brown fused alumina.aluminium oxide When the brown corundum is calcined in an oxidizing atmosphere, the brown particles of the brown corundum become blue, and the solid solution Ti2O3 causes the blue color to appear.


This high-end abrasive is obtained by calcination of brown corundum sand at a high temperature of 1400 degrees, with higher content and higher hardness. The color becomes dark blue, so the production cost of blue corundum is higher than that of brown corundum.


In recent years, brown corundum sand has been used for sandblasting and polishing in industrial products, and it has a wide range of uses. Brown corundum has the characteristics of high temperature resistance, strong cutting ability and high hardness. Many customers have higher requirements and require brown corundum. Calcined again, and there is blue corundum.


Only brown corundum containing solid solution titanium oxide (Ti2O3) will appear calcined blue. Brown corundum with low Ti2O3 content will not turn blue. Like many characteristics of granular materials, the blue color after calcination is the average color of all particles in the sample.


Ti2O3 is the only oxide that titanium can dissolve in α-alumina grains. At the same time, TiO2 is the oxide with the best thermodynamic stability of titanium. Above 1000°C, oxygen can diffuse into α-alumina grains, oxidizing Ti2O3 into more stable TiO2.hsl abrasive It is then wrapped in α-alumina grains. The TiO2 core continues to coalesce and grow at a temperature-dependent rate. Once the titanium dioxide grains reach a size of 0.01 to 0.1μ, they begin to scatter light similar to colloidal suspensions.

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