The medium-temperature calcined abrasive is calcined at a high temperature of 1050 ° C in the production process of the original brown corundum, and then subjected to bonfire treatment. Its main features are: sharp edges, sharp, uniform grain shape, high strength, good self-sharpness, low grinding heat, greatly improved bond strength between abrasive and abrasive cloth after calcination, greatly reduced sand removal rate and low sand belt expense. In addition, the abrasive has a very small expansion coefficient, excellent hydrophilicity, high toughness and high strength, which solves the cracks and rust spots of the abrasive during the processing, thus improving the precision and grinding effect of the abrasive processing. In particular, it is suitable for the production of high-grade bonded abrasives and coated abrasives. |