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Apatite-mullite glass-ceramics

1996; Elsevier BV; Volume: 196; Linguagem: Inglês

10.1016/0022-3093(95)00611-7

1873-4812

A. Clifford, Robert G. Hill,

Advanced ceramic materials synthesis

Two series of glasses based on (2 − x)SiO2 · xP2O5 · Al2O3 · CaO · yCaF2 were studied. The values of x and y were varied from 0 to 1. The nucleation and crystallisation processes that occurred in these glasses were measured. Glasses in which x = 0.5 and y was greater than 0.5 crystallised to fluorapatite and mullite. Crystallisation occurred by a bulk nucleation mechanism involving prior amorphous phase separation. The glass with x= 0.5 and y = 0.5 was converted to a ceramic to give a material consisting of elongated fluorapatite crystals that had high fracture toughness.