Superplasticity o f liquid-phase sintered beta -SiC

摘要

The compression and the tension tests of liquid-phase sintered beta -SiC fabricated by hot-pressing using ultra fine powders were performed at 1973 K approx 2048 K in N_2 atmosphere. Amorphous phases were observed at the grain boundaries and at multi-grain junctions in the assintered material. Strain hardening was observed under all experimental conditions. Stress exponents in the compression test were form 1.7 to 2.1 in the temperature ranging from 1973 K to 2023 K. A maximum tensile elongation of 170