Abstract

The fabrication of SiC–AlN solid solutions with columnar inter-grains using the addition of small amounts of α-SiC to an AlN–β-SiC mix was studied by hot-pressing under 2030°C. The appreciable amounts of α-SiC content for a reaction of AlN and β-SiC affected the SiC–AlN phase relationships and the microstructures by stabilizing a 2H phase. It could develop columnar inter-grains of 4H phase and the stable 2H phase with a uniform composition and grain size distributions. The α-SiC containing samples showed fracture toughness of 5.1–5.4 MPa m 1/2. The fracture toughness was related to the amounts of 4H present. The enhanced fracture toughness was due to the reinforcement of the columnar inter-grains of 4H phase in the 2H phase induced by appreciable amounts of α-SiC.

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