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Wet Processing and Low-Temperature Pressureless Sintering of SiC Using a Novel Al3BC3 Sintering Additive

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Highly concentrated slurry preparation and low-temperature pressureless sintering of SiC using a novel Al3BC3 additive were investigated. Al+B4C+C powder mixture, which is a conventional sintering additive system of SiC, could not be dispersed in ethyl alcohol above 10 vol%. In contrast, Al3BC3 slurry (average particle size: 0.5 m) could be prepared up to 50 vol% solid loading and SiC slurry containing 10 wt% Al3BC3 was successfully fabricated up to 45 vol%. The relative density of SiC was 97.9% after pressureless sintering at 1850°C. Young's modulus and hardness of a sintered SiC were 411 and 22.5 GPa, respectively. The present report proposes a method for the low-temperature pressureless sintering of SiC specimens having complex shape and fair mechanical properties by the application of a ternary compound (Al3BC3) as a novel-sintering additive.

Document Type: Research Article


Affiliations: 1: National Institute for Materials Science, Ibaraki 305-0047, Japan 2: National Institute for Materials Science, Ibaraki 305-0044, Japan 3: Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Tokyo 153-8505, Japan

Publication date: December 1, 2009


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