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J. Korean Ceram. Soc. > Volume 37(8); 2000 > Article
Journal of the Korean Ceramic Society 2000;37(8): 792.
SiC 휘스커 및 TiC 입자 강화 알루미나 복합재료의 기계적 성질과 미세조직
이영규, 김준규, 조원승, 최상욱
인하대학교 재료공학부
Mechanical Properties and Microstructures of Alumina Composites Reinforced with SiC Whiskers and TiC Particles
ABSTRACT
Alumina composites reinforced with SiC whiskers only or combinded with TiC particles were prepared by hot-pressing at 1850$^{circ}C$ for 1h. The mechanical properties and microstructures of composites were investigated in this study. By of addition either 20 vol% SiC whiskers or 20 vol% TiC particles, the flexural strength fo alumina was increased from 360 MPa to 650 MPa or 730 MPa, respectively, and the KIC was also increased from 3.5 MPa$.$m1/2 to 5.5MPa$.$m1/2 or 4.4MPa$.$m1/2, respectively. In the case of composites with 20 vol% SiC whiskers and 2 vol% TiC particles. The flexural strength and KIC showed relatively high value of 800 MPa and 5.3MPa$.$m1/2, respectively. The improvement of mechanical properties was considered to be due to both the smaller average grain size and the crack deflection.
Key words: Alumina, Composite, Microstructure, Mechanical properties
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