A new methodology to guarantee the structural integrity of Al2O3/SiC composite using crack healing and a proof test
A new methodology to guarantee the structural integrity of Al2O3/SiC composite using crack healing and a proof test
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DOI：
10.1111/j.1460-2695.2007.01132.x
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发表时间：
2007-07-01
影响因子：
3.7
通讯作者：
Ando, K.
中科院分区：
文献类型：
--
作者：
Ono, M.;Nakao, W.;Ando, K.
结构陶瓷易碎，对缺陷很敏感。因此，陶瓷部件的结构完整性可能会受到固有缺陷的严重影响。对于这个问题，自我修复是一个很好的答案。然而，目前还没有一种技术可以治愈嵌入的缺陷。因此，需要一种技术来保证陶瓷部件的可靠性，因此，K. Ando等人开发了一种使用裂纹愈合然后进行证明测试的技术来实现这一目标。利用这种技术，测试裂纹愈合区的力学行为对于确保陶瓷构件的结构完整性非常重要。本研究首先烧结了具有良好裂纹愈合能力的Al2O3/SiC复合材料。其次，在试样上引入裂纹（3mm x 4mm x 36mm），使抗弯强度降低约80%，随后裂纹被愈合。第三，对裂纹愈合后的试样进行了验证试验。最后，使用裂纹愈合和证明测试的样品，进行了高达1373 K的断裂测试。从室温（R.T.）到1373 K，将测量到的最小断裂应力（sigma(Fmin)）与理论最小强度（sigma(G)）进行比较。结果表明，σ (G)与σ (Fmin)在1373 K范围内具有较好的一致性，裂纹愈合后进行验证试验是提高Al2O3/SiC复合材料存活概率和保证其可靠性的一种很好的技术。
Structural ceramics are brittle and sensitive to flaws. As a result, the structural integrity of a ceramic component may be seriously affected by inherent flaws. Self-crack-healing is an excellent answer to this problem. At the moment, however, there is no technique to heal embedded flaws. Therefore, a technique to guarantee the reliability of ceramic components is demanded, and thus a technique using crack healing followed by proof test was developed by K. Ando et al. to accomplish this. With this technique, testing the mechanical behaviour of the crack-healed zone is very important for ensuring the structural integrity of a ceramic component. In this study, first Al2O3/SiC composite with an excellent crack-healing ability was sintered. Second, a crack was introduced on the sample (3 mm x 4 mm x 36 mm), which reduced the bending strength by about 80%, and subsequently the crack was healed. Third, a proof test was carried out on the crack-healed sample. Last, using the crack-healed and proof-tested sample, a fracture test was carried out up to 1373 K. The measured minimum fracture stress (sigma(Fmin)) was compared with the theoretical minimum strength (sigma(G)) from room temperature (R.T.) to 1373 K. It was concluded that sigma(G) showed good agreement with sigma(Fmin) up to 1373 K and that the crack healing followed by proof test was an excellent technique to increase the survival probability by administering a proof test and to guarantee the reliability of Al2O3/SiC composite.