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Zhang H.,South China University of Technology | Zhang H.,The Key Laboratory of Specially Functional Materials | Chen X.,South China University of Technology | Chen X.,The Key Laboratory of Specially Functional Materials | And 8 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2010

Glass-ceramics were prepared in a K2O-MgO-Al2O3- B2O3-SiO2-F system doped with different amounts of Ca, P and F, in a percentage of fluorapatite. The batches were melted at 1 500 °C and annealed at 580 °C for 1.5 h. The glass-ceramics with different microstructures and properties were obtained after heat treatment of the glass with special phase separation. The X-ray diffraction and scanning electron microscopy analysis show that flake-shaped fluorophlogopite and needle-like fluorapatite appear in the crystal glass and that needle-like fluorapatite assumed a distinct distribution, both random and oriented, due to the special phase separation. Moreover, for the apatite-oriented samples, machinability in direction parallel to needle-like apatite is inferior to the opposite direction. However, the machinability for the glass-ceramics with random apatite distribution lay somewhere in between. Source

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