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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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In this study, the crack healing effects of Al₂O₃ ceramics based on the heat treatment conditions were investigated. The influence of the additive amounts of SiC nanoparticles and the cycling process of indentation-heat treatment on the crack healing effect of Al₂O₃ ceramics were also examined. Three-point bending tests were carried out and the morphological changes in the fracture surface were observed by using FE-SEM. As a result, heat-treated samples in a vacuum or air atmosphere showed improved bending strengths compared to un-heat treated samples. This means that cracked specimens can be healed by heat treatment in a vacuum or air atmosphere. The crack healing effect of Al₂O₃ ceramics that were heat treated in an air atmosphere was much higher than that of those heat treated in a vacuum. After heat treatment, the Al₂O₃ ceramics with 30 wt% SiC nanoparticles showed a higher bending strength than those with 15 wt% SiC. The cyclic indentation and heat treatment did not remarkably affect the crack healing effect. The SEM images showed that the median crack, indenter mark on the surface, and pores in the fracture surface of a specimen almost disappeared after being heat treated in an air atmosphere.
목차
ABSTRACT
1. 서론
2. 재료 및 실험방법
3. 결과 및 고찰
4. 결론
참고문헌
참고문헌 (11)
참고문헌 신청
1. [학술지(정기간행물)] - Ando, K. / 2002 / High Temperature and Fatigue Strength of Ccrack-healing Mullite/ Silicon Carbide Ceramics / Journal of the Korean Society for Power System Engineering 6 (1) : 88 ~ 95
2. [학술지(정기간행물)] - Ando, K. / 2005 / Crackhealing Ability of Structural Ceramics and a New Methodology to Guarantee the Structural Integrity Using the Ability and Proof-test / Journal of the European Ceramic Society 25 (5) : 549 ~ 558
3. [학술지(정기간행물)] - Ando, K. / 2002 / (Crack-healing + Proof Test) : A New Methodology to Guarantee the Structural Integrity of a Ceramics Component / Journal of the European Ceramic Society 22 : 121 ~ 128
4. [학술지(정기간행물)] - Fang, J. / 1995 / Residual Stress Relaxation Behavior in Al2O3-SiC Nanocomposite / Materials Science and Engineering A 195 (1) : 163 ~ 167
5. [학술지(정기간행물)] - Kim, B. A. / 2009 / Mechanical Properties of Silicon Carbide Sintered with Additive Y2Al5O12 / Journal of Nuclear Materials 386-388 : 1095 ~ 1097
2. [학술지(정기간행물)] - Ando, K. / 2005 / Crackhealing Ability of Structural Ceramics and a New Methodology to Guarantee the Structural Integrity Using the Ability and Proof-test / Journal of the European Ceramic Society 25 (5) : 549 ~ 558
3. [학술지(정기간행물)] - Ando, K. / 2002 / (Crack-healing + Proof Test) : A New Methodology to Guarantee the Structural Integrity of a Ceramics Component / Journal of the European Ceramic Society 22 : 121 ~ 128
4. [학술지(정기간행물)] - Fang, J. / 1995 / Residual Stress Relaxation Behavior in Al2O3-SiC Nanocomposite / Materials Science and Engineering A 195 (1) : 163 ~ 167
5. [학술지(정기간행물)] - Kim, B. A. / 2009 / Mechanical Properties of Silicon Carbide Sintered with Additive Y2Al5O12 / Journal of Nuclear Materials 386-388 : 1095 ~ 1097
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UCI(KEPA) : I410-ECN-0101-2014-550-003649710