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What determines the color change of white corundum abrasive tools

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Carrie Ge

White corundum ultra-fine grinding powder is used in computer chip components, electronic communication products silicon chip components, rocket engine temperature-resistant components, high-temperature gas turbine blade components, etc. white fused alumina powder The production method of white corundum ultra-fine grinding powder is based on aluminum hydroxide. It is prepared after calcination, crushing, pickling, classification and drying. For fine powder with a particle size of less than 40 microns, it is classified by hydraulic sedimentation, and the classification is carried out from fine to coarse, first divided into fine grade, then coarse grade Until all classifications are completed.

 

The color change of white corundum abrasive tools is mainly determined by the amount of impurities in the binder and the firing atmosphere. hsl abrasives If it is fired in an oxidizing atmosphere, when the content of (TiO2+Fe2O3) in the binder is less than 0.55%, the white corundum will not show red or red-yellow hue.

 

With the increase of the content of Fe2O3 and TiO2 in the binder, the white corundum abrasive tool will show red and red-yellow tone gradually. Therefore, if the content of (TiO2+Fe2O3) in the binder is greater than 0.55%, the white corundum abrasive tool is not suitable for firing Use an oxidizing atmosphere, preferably a neutral atmosphere or a weak oxidizing atmosphere for firing.

 

Adding talc powder, quartz powder and magnesium oxide powder to the bonding agent white corundum abrasive tool binder can eliminate the redness of white corundum, but it has an impact on the strength of the abrasive tool.

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