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Study on crack-healing behavior of structural ceramics -Crack-healing behavior at service temperature and resultant strength at temperature of healing-

结构陶瓷裂纹愈合行为研究-使用温度下的裂纹愈合行为及愈合温度下的强度-

基本信息

批准号：
13650076
负责人：
ANDO Kotoji
金额：
$ 2.24万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The object of this study is to investigate the following four topics. (1) Crack-healing behavior at service temperature and resultant strength at temperature of healing of mullite/SiC composite sintered by the authors. (2) Crack-healing behavior at service temperature and resultant strength at temperature of healing of Si_3N_4/SiC composite sintered by the authors. (3) Development of alumina (Al_2O_3) having quite high crack-healing ability. (4) Development of silicon carbide (SiC) having quite high crack-healing ability. The results obtained for each object are as follows :(A) It was found that the mullite/SiC has quite high in-situ crack-healing ability, that is, the material can heal a crack even at service temperature and, moreover, crack-healed zone had quite high strength at the temperate of healing. A pre-crack of considerable length, which reduced the bending strength by 70%, can be healed completely at temperatures between 1273K and 1473K even under quite high static and cyclic bending stress. The bending strength of the crack-healed specimens is similar to that of the smooth specimens.(B) It was found that the Si_3N_4/SiC has quite high in-situ crack-healing ability. A pre-crack of considerable length, which reduced the bending strength by 50%, can be healed completely at temperatures between 1173K and 1473K even under quite high static and cyclic bending stress. The bending strength of the crack-healed specimens is similar to that of the smooth specimens.(C) An alumina having quite high crack-healing ability and high temperature strength has been developed. The basic crack-healing behavior of the alumina was investigated.(D) The limit temperature of the crack-healed zone of SiC ceramics was increased from 873K to 1473K.

本研究的目的是调查以下四个主题。(1)作者研制的莫来石/碳化硅复合材料在使用温度下的裂纹愈合行为和在愈合温度下的合成强度。(2)作者研制的Si_3N_4/碳化硅复合材料在使用温度下的裂纹愈合行为和愈合温度下的合成强度。(3)具有较高裂纹愈合能力的氧化铝(Al_2O_3)的研制。(4)具有较高裂纹愈合能力的碳化硅的研制。结果表明：(1)莫来石/碳化硅复合材料具有较高的原位裂纹愈合能力，即即使在使用温度下也能修复裂纹，且裂纹愈合区在愈合温度下具有较高的强度。在1273K~1473K温度范围内，即使在相当高的静弯曲应力和循环弯曲应力下，相当长的预裂纹使抗弯强度降低了70%，也能完全愈合。裂纹愈合试件的抗弯强度与光滑试件的抗弯强度相近。(2)研究发现，Si3N4/SiC复合材料具有较高的原位裂纹愈合能力。在1173~1473K温度范围内，即使在较高的静弯曲应力和循环弯曲应力下，相当长的预裂纹使抗弯强度降低50%，也能完全愈合。裂纹愈合试件的抗弯强度与光滑试件相近。(C)研制了一种具有较高裂纹愈合能力和高温强度的氧化铝。研究了氧化铝的基本裂纹愈合行为。(D)碳化硅陶瓷裂纹愈合区域的极限温度由873K提高到1473K。