Microstructure and Mechanical Properties of the <TEX>$Al_2O_3-SiC$</TEX> Ceramics Produced by Melt Oxidation

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J. Korean Ceram. Soc. > Volume 31(10); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(10): 1169.

용융산화법으로 제조한 $Al_2O_3-SiC$ 세라믹스의 미세구조와 기계적 성질

김일수, H. W. Hennicke¹

동의대학교 재료공학과
¹Clausthal, 독일

Microstructure and Mechanical Properties of the $Al_2O_3-SiC$ Ceramics Produced by Melt Oxidation

ABSTRACT

Five Al2O3/SiC/metal composites with four different particle sizes of green SiC abrasive grains are grown by the directed oxidation of an commercially available Al-alloy. Oxidation was conducted in air at 100$0^{circ}C$, 96 hours long. Slip casted SiC-fillers were placed on the alloy or SiC powder deposited up to the required layer thickness. Their microstructures are described and measurements of density, elastic constants, frexural strength, fracture toughness and work of fracture are reported. The results are compared with those of commercial dense sintered Al2O3. The properties of produced materials have a strong relationship to not only the properties of Al2O3, SiC, Al and Si but also to the phase share and phase distribution. The composite materials are dense (0.5% porosity), tough (KIC = 3.4~6.4 MPa{{{{ SQRT { m} }}), strong ({{{{ sigma }}B = 170~345 MPa) and reasonably shrinkage free producible. The reinforcements is attained mainly through the plastic deformation of ductile metal phase.