Preparation of Si-SiC Composites by Si-Infiltration

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J. Korean Ceram. Soc. > Volume 29(9); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(9): 750.

Si 침윤에 의한 Si-SiC 복합체 제조

김인술, 장주민, 오기동, 박홍채

부산대학교 무기재료공학과

Preparation of Si-SiC Composites by Si-Infiltration

ABSTRACT

Reaction bonded si-SiC composites were prepared by silicon infiltration technique at temperature of 1$600^{circ}C$ for 30 minutes in vaccum atmosphere. The microstructure and mechanical properties of Si-SiC composites were investigated and characterized. UF-15 and SE-10 as SiC powders, phenolic resin and carbon black as carbon source, and metallic silicon powder as molten Si source were used as starting materials. New SiC crystallines nucleatd and grown by reaction of Si and C were detected by TEM and SEM-EDS. The bonding between new and original SiC was found to be strong. But the wetting of SiC by unreacted metallic Si and the rapid grain growth of new SiC decreased density and fracture toughness. Fracture toughness and modulus of rupture of Si-SiC composite were about 3.2 MPa.m1/2 and 480 MPa, respectively.