Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지

Toughening Characteristic of Ceramic Composites by Microcracking

Microcracking에 의한 세라믹 복합재료의 고인성화 특성

  • 장병국 (한국에너지기술연구소 에너지재료연구팀) ;
  • 우상국 (한국에너지기술연구소 에너지재료연구팀)
  • Published : 1999.02.01
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Abstract

In order to investigate the toughening characteristic by microcrack formation in ceramic composites, $Al_2$O$_3$/(0~20)vol% YAG composites containing equiaxed second grains were fabricated using$ Al_2$$O_3$ during hot-pressing. AE(acoustic emission) measurements have been coupled with fracture toughness experiments of SENB method, to evaluate the microcrack formation and the improvement in fracture toughness of ceramic composites. Formation of microcrack was detected by Ae. The generation of AE events increased with increasing of load when load was applied at specimen. The AE events are generated mainly around at maximum load. Specially, the detected AE evetns of composites are many as compared with monolithic $Al_2$$O_3$. Fracture toughness of composites was improved than that of monolithic alumina. $Al_2$O$_3$/YAG composites exhibit main toughening effects by microcracking, results from mutual coalesence of microcracks being generated under applied load. However, there are few toughening mechanism like microcracking in monolithic alumina.

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References

  1. J. Am. Ceram. Soc. v.74 no.2 P.F.Becher
  2. Ceram. Eng. Sci. Proc. v.11 no.7-8 W.Rice
  3. J. Am. Ceram. Soc. v.73 no.7 J.Homeny;W.L.Voughn
  4. J. Am. Ceram. Soc. v.69 no.3 E.Breval;V.Srikanth;E.C.Subbarao
  5. J. Am. Ceram. Soc. v.64 no.7 A.G.Evans;K.T.Faber
  6. J. of Mater. Sci. v.28 E.D.Case;Y.Kim
  7. J. of Mater. Sci. v.28 E.D.Case;Y.Kim
  8. 재료거동학 이강용
  9. Bull. of Kor. Ceram. Soc. v.10 no.4 B.K.Jang;S.H.Lee;H.K.Oh
  10. Materials Evaluation v.50 no.7 Z.Gong;E.O.Nyborg;G.Oommen
  11. J. Am. Ceram. Soc. v.78 no.9 M.Ruhle;N.Claussen;A.H.Heuer
  12. Ceram. Int. v.18 V.Srikanth;E.C.Subbarao;G.V.Rao
  13. J. Jpn. Inst. Metals. v.47 no.7 T.Ohira;T.Kishi
  14. J. Jpn. Inst. Metals. v.49 no.9 T.Kishi;S.Wakayama;Y.Shinozaki;Y.Kagawa;E.Nakata
  15. Ceramic Bulletin v.56 no.6 N.Claussen;J.Steeb;R.F.Pabst
  16. J. Am. Ceram. Soc. v.64 no.7 A.G.Evans;K.T.Faber