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Wet Processing and Low‐Temperature Pressureless Sintering of SiC Using a Novel Al 3 BC 3 Sintering Additive
Author(s) -
Lee SeaHoon,
Sakka Yoshio,
Tanaka Hidehiko,
Kagawa Yutaka
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03336.x
Subject(s) - sintering , pressureless sintering , materials science , slurry , ternary operation , relative density , composite material , metallurgy , computer science , programming language
Highly concentrated slurry preparation and low‐temperature pressureless sintering of SiC using a novel Al 3 BC 3 additive were investigated. Al+B 4 C+C powder mixture, which is a conventional sintering additive system of SiC, could not be dispersed in ethyl alcohol above 10 vol%. In contrast, Al 3 BC 3 slurry (average particle size: 0.5 μm) could be prepared up to 50 vol% solid loading and SiC slurry containing 10 wt% Al 3 BC 3 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 (Al 3 BC 3 ) as a novel‐sintering additive.