1517 光ファイバAE計測システムを用いた真空ろう接材の接合状態の評価(S10-3 非破壊評価とモニタリングIII,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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This study aims to study in-situ evaluation of bond quality of brazing in vacuum using an optical fiber acoustic emission monitoring system with a highly heat resistant optical fiber. The heat resistant fiber was fabricated by plating Ni-P on a commercially available metal coated fiber. This fiber enables us to monitor AE at elevated temperature up to 1150℃ We monitored AE using the system during blazing at appropriate and lower temperature at pressure of 2 Pa. We detected two types of AE signals classified by frequency analysis during brazing. One was the AE with low frequency components which was detected during heating and cooling process and were identified as friction noises of the sample and jig or fastening bolts. Another was the AE with broad band frequency of 20 kHz to 120 kHz which was detected only cooling process for the sample brazing at lower temperature and was caused by poor bond quality.
一般社団法人日本機械学会の論文
2008-08-02