Abstract
Effects of the addition of B, Al, Fe, and C on the annihilation of stacking faults (S.F.) in β-SiC powder compacts were investigated. The separability of the X-ray diffraction lines, Kα 1 and Kα 2 , was applied to the qualitative evaluation of the lattice strain to elucidate the annihilation phenomena. Dissolution of B or Al (rapid heating condition) into SiC grains enhanced the lattice strain suppressing both grain growth and S.F. annihilation. The second phases formed in Al (slow heating condition) and Fe addition to β-SiC promoted both grain growth and S.F. annihilation, while the residual free carbon in C- added β-SiC impeded the grain boundary movement and hence suppressed grain growth and S.F. annihilation.
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