| Nitrided Pressureless Sintering 공정을 이용한 질화규소 세라믹스의 제조 및 특성 |
| 천승호, 한인섭, 정용희, 서두원, 이시우, 홍기석, 우상국 |
| 한국에너지기술연구원 에너지재료연구센터 |
| Preparation and Properties of Silicon Nitride Ceramics by Nitrided Pressureless Sintering (NPS) Process |
| Sung-Ho Cheon, In-Sub Han, Yong-Hee Chung, Doo-Won Seo, Shi-Woo Lee, Kee-Soeg Hong, Sang-Kuk Woo |
| Energy Materials Research Center, Korea Institute of Energy Research |
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| ABSTRACT |
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The mechanical properties and microstructure and thermal properties of Nitrided Pressureless Sintering(NPS) silicon nitride ceramics, containing three type of $Al_{2}O_3,;Y_{2}O_3$ sintering additives, were investigated. Also, we have investigated the effect of silicon metal content changing with 0, 5, 10, 15, and $20wt%$ Si in each composition. In $5wt%;Al_{2}O_3,;5wt%;Y_{2}O_3,;and;5wt%$ Si composition, silicon nitride sintered body was successfully densified to a high density. The average 4-point flexural strength and relative density of these specimens were 500 MPa and 98% respectively. Also, Thermal expansion coefficient and thermal conductivity of specimens at room temperature were $2.89{times}10^{-6}/^{circ}C;and;28W/m^{circ}C$, respectively. The flexural strength of sintered specimens after thermal shock test of 20,000 cycles was maintained as-received value of 500 MPa. |
| Key words:
Nitrided Pressureless Sintering(NPS), Silicon nitride, Thermal shock resistance |
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