| $beta-Sialon/SiC$ Whisker 복합재료의 기계적 물성 및 마찰 마모 특성 연구 |
| 김호균, 소유영, 김인섭, 이병하 |
| 명지대학교 공과대학 무기재료공학과 |
| Mechanical and Tribological Properties of $beta-Sialon/SiC$ Whisker Composite |
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| ABSTRACT |
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$beta$-Sialon has been regarded as one of promising materials showing high strength, fracture toughness, corrosion resistence and wear resistence. The improvement of the fracture toughness and tribological properties of $beta$-Sialon (Z=1) has been attempeted by fabricating the $beta$-Sialon/ SiC whisker composite. Each of green body composed of following ingredients, i.e., Si3N4, AlN, Y2O3 nd SiC, respectively, was first fired at 178$0^{circ}C$ for 3hrs in N2 atmosphere and then post-HIPed at 173$0^{circ}C$ for 1 hr under 170 MPa for N2 gas pressure. The fracture toughness, flexural strength and tribological properties increased with increasing SiC whisker content, despite the reduction of the relative density and hardness. $beta$-Sialon/15 vol% SiC whisker showed a significant enhancement of wear resistance compared to the monolithic $beta$-Sialon. The addition of SiC whisker caused the reduction of the density and hardness, but induced the increment of wear resistance. |
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