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Preparation And Microstructure Of Machinable Al2O3/Mica Composite By Ball Milling And Hot-Press Sintering, Qingbo Tian, Deyu Kong, Tongguang Zhai

Chemical and Materials Engineering Faculty Publications

A machinable α-Al₂O₃/mica composite was prepared by hot-press sintering. In this experiment, a mica-contained glass ceramic in the MgO-Al₂O₃-SiO₂-F glassy system was employed and the base glass powders were obtained by traditional melting-quenched method. Then, α-Al₂O₃ milling swarf was introduced by medium α-alumina milling ball to the glass powders. The test results indicate that the composites consist of mica crystal and mullite crystal, which are precipitated in the base glass. The α-Al₂O₃ shows an irregular polygon, which is inlayed in the base material. With …