Tribological Properties of Pressureless-sinteed Silicon Carbide

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J. Korean Ceram. Soc. > Volume 35(7); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(7): 721.

상압소결 탄화규소 소결체의 마찰마모특성

백용혁, 최웅, 서영현¹, 박용갑²

전남대학교 세라믹공학과
¹포항제철(주) 광양제철소
²선문대학교 재료공학과

Tribological Properties of Pressureless-sinteed Silicon Carbide

ABSTRACT

In this study solid-phase sintered silicon caribide samples composed of SiC powder having boron and car-bon black as additives were prepared by pressureless sintering at $1950^{circ}C$. The bending strength the frac-ture toughness and the specific werar rate of the samples were examined and the micro structures of the broken and the worn surface were observed by SEM to understand the relationship between the tri-bological charcteristics and the micro structure. Additionally the relationship between the micro struc-tures and the tribological characteristics of the samples for the frictional opponents SiC and $Al_{2}O_{3}$ pins were investigated
Conclusions
are as follows ; 1. The specific were rate of the samples for the SiC pin was larger than that for the $Al_{2}O_{3}$ pin. HOwever the specific wear rate for the $Al_{2}O_{3}$ pin was increased about 6,45 times as that for the SiC pin under the load increasing. 2. The specific wear rate of the SiC pin was larger than that of the $Al_{2}O_{3}$ pin. owever the specific wear rate of the $Al_{2}O_{3}$ pin was increased about 4 times as that of the SiC pin under the load increasing 3. The micro stucture of the worn surface showed a flat face without cracks in the case that the frictional opponents has the low friction coefficient but in the case of without cracks in the case that the frictional opponents has the low friction coefficient but in the case of the high friction coefficient the micro structure of the worn surface showed an uneven face having spread-ed cracks. 4. The tribological characteristics of thesolid-phase sintered SiC samples was similar to that of li-quid-phase sintered ones when the pin having the high friction coefficient was used.

Key words: Tribological propertis, Friction coefficient, Wear resistance, Specific wear rate