| 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) |
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| ABSTRACT |
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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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