レーザ加熱によるAl_2O_3セラミックスの亀裂の修復に関する研究 : AEによる修復状態の評価

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Ceramics have many excellent mechanical characteristics. However, it is being taken up that the bending strength is decreased by the micro crack of the ceramics surface as a serious problem. Therefore, the repair of the cracks is one of the important technologies for the practical use of ceramics. This paper describes the repair of the crack for Al_2O_3 ceramics with pulsed YAG laser irradiation and the evaluation of its conditions with Acoustic Emission (AE) method. The specimens of Al_2O_3 Ceramics (i.e. smooth, pre-cracked and laser irradiated specimen) were prepared. The AE signals were measured during 4-point bending test of these specimens. As a result of evaluating the repair condition of the crack with the laser irradiation based on the microscopy and AE method, the following facts became clear. ( 1 ) In the detected AE signals during the bending test of the smooth, the pre-cracked and the laser irradiation specimen, there were features. ( 2 ) In the 270 V-applied voltage or less, the repair effect of the crack was not obtained. There was the recovery of the strength in the 310 V-applied voltage ; however,the behavior of AE signals resembled the feature of the pre-cracked specimen because the damage by the laser irradiation was intense. On the other hand, the bending strength and the AE signals of the irradiation specimen of the 290 V-applied voltage were similar to the features of the smooth specimen. ( 3 ) In addition to the bending strength and the microscopy, it was proven that making observation of the behavior of the detected AE signals during the bending test could carry out the detailed evaluation on the repair condition of the crack.
一般社団法人日本機械学会の論文
2001-05-25

レーザ加熱によるAl_2O_3セラミックスの亀裂の修復に関する研究 : AEによる修復状態の評価

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