Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Mechanical Properties and Microstructures of Alumina Composites Reinforced with SiC Whiskers and TiC Particles

SiC 휘스커 및 TiC 입자 강화 알루미나 복합재료의 기계적 성질과 미세조직

  • Published : 2000.08.01
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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.

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References

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