한국재료학회지 (Korean Journal of Materials Research)

  • 제14권9호
  • /
  • Pages.649-654
  • /
  • 2004
  • /
  • 1225-0562(pISSN)
  • /
  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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SiC 휘스커 강화 Al2O3 복합재료의 고인화

Toughening of SiC Whisker Reinforced Al2O3 Composite

  • 김연직 (국립 익산대학 산업설비제어과) ;
  • 송준희 (전북대학교 공과대학 기계공학부 공업기술연구센터)
  • Kim Yon Jig (Dept. of Industrial Facilities Control, Iksan National College) ;
  • Song Jun Hee (Faculty of Mechanical Engineering, Research Institute of Industrial Technology, Chonbuk National University)
  • 발행 : 2004.09.01
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초록

In this paper, the fracture toughness and mechanisms of failure in a random SiC-whisker/$Al_{2}O_3$ ceramic composite were investigated using in situ observations during mode I(opening) loading. $SiC_{w}/Al_{2}O_3$ composite was obtained by hot press sintering of $Al_{2}O_3$ powder and SiC whisker as the matrix and reinforcement, respectively. The whisker and powder were mixed using a turbo mill. The composite was produced at SiC whisker volume fraction of $0.3\%$. Compared with monolithic $Al_{2}O_3$, fracture toughness enhancement was observed in $SiC_{w}/Al_{2}O_3$ composite. This improved fracture toughness was attributed to SiC whisker bridging and crack deflection. $SiC_{w}/Al_{2}O_3$ composite exhibited typically brittle fracture behavior, but a fracture process zone was observed in this composite. This means that the load versus load-line displacement curve of $SiC_{w}/Al_{2}O_3$ composite from a fracture test may involve a small non-linear region near the peak load.

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