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Formation of solid solutions between SiC and AlN during liquid-phase sintering

1996; Elsevier BV; Volume: 29; Issue: 1-3 Linguagem: Inglês

10.1016/s0167-577x(96)00110-3

1873-4979

Jong-Kook Lee, Hidehiko Tanaka, Hwan Kim,

Metal and Thin Film Mechanics

A 2H-solid solution between SiC and AlN, along with a dispersion of SiC, was prepared by liquid-phase sintering, and the mechanism of solid solution formation between SiC and AlN was investigated from studies of the microstructures of the sintered body. The SiC-AlN composite microstucture was composed of isolated SiC particles, the 2H-solid solution of spherical shape, and an irregular shaped phase which was liquid at high temperature. The grain morphology of the 2H-solid solution phase was almost the same with equiaxed grains of 2 to 3 μm in diameter. The AlN content in the 2H-solid solution was higher than that of SiC. A few 2H-grains showed a core-rim structure and a difference in Si content between core and rim. The Si content in the rim was higher than that in the core. Al2O3 grains surrounded by YAG were found to be embedded in the 2H grains. The 2H-solid solution formed during liquid-phase sintering occurs via a nucleation and growth process.