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J. Korean Ceram. Soc. > Volume 28(3); 1991 > Article
Journal of the Korean Ceramic Society 1991;28(3): 189.
알콕사이드로 부터 $alpha$-Sialon 세라믹스의 제조 및 기계적 성질(II)
이홍림, 윤창현
연세대학교 공과대학 요업공학과
Synthesis of $alpha$-Sialon Ceramics from an Alkoxide and Their Mechanical Properties(II)
Si(OC2H5)4, commercial AlN and Y2O3 powder were used as the precusor of Si3N4, AlN, Y2O3, respectively. After Si3N4 powder was synthesized by carbothermal reduction and nitridation at 135$0^{circ}C$ for 13h in N2 atmosphere, characteristics of synthesized powder and the ceramics sintered at 178$0^{circ}C$ for 1h under 30MPa were investigated. In order to evaluate the reliability of sintered body, Weibull modulus was investigated. Premixing of carbon black as a reduction agent had no effect on Si(OH)4 formation, and Si3N4 powder synthesized from Si(OC2H5)4 was $alpha$-Si3N4 single phase. Mechanical properties of sintered body were measured as follows : flexural strength ; 750MPa, fracture toughness ; 3.71Mn/3/2, hardness : 17.4GPa, thermal shock resistence temperature ; $600^{circ}C$. Flexural strength at room temperature was 750MPa and was retained up to 110$0^{circ}C$. The Weibull modulus of sintered body was 10.7.
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