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Fabrication of micro capsule containing fluorescent magnetic particles for advanced inspection of heat exchanger tubes

高度な熱交換器検査技術のための蛍光磁粉内包マイクロカプセルの作製

伊東 富由美; 西村 昭彦 

Ito, Fuyumi; Nishimura, Akihiko

溶接部欠陥の検査技術の1つとして蛍光磁粉を用いた磁粉探傷試験がある。伝熱管の検査技術に適用する磁粉探傷試験を高度化するため、複雑な形状及び深さが数$$mu$$m以上の欠陥でも検出可能という特徴を活かしつつ、伝熱管内に磁粉を散布するという短所の改善が必要である。ここではミリメートルサイズの欠陥に磁粉を集合するため、磁粉を内包したマイクロメートルサイズのカプセルの作製を行った。この作製したマイクロメートルサイズのカプセルは磁力線に集合することを確認した。これにより磁粉の回収が容易となり、高経年化する軽水炉の検査技術に役立つ手法となる。

Stress corrosion cracking sometimes occurs in the heat exchanger tubes of aging nuclear power plants. At the present time, Eddy Current Testing (ECT) is used to inspect these heat exchanger tubes. When symptoms of corrosion or cracks are found on the inside wall of the tubes, they are usually repaired. As repaired tubes increase in number, the cost of repair work rises considerably. Therefore, discovering tiny cracks has the purpose of ensuring not only progress on safety but also economical benefit. Cracks are observed not only by ECT but also by Magnetic particle Testing (MT), which facilitates visual observation. In the case of MT, a dispersed liquid with magnetic particles is applied to a magnetized sample. However, this dispersed liquid could potentially enter inside the crack. To solve this problem, this paper proposes that magnetic particles be contained inside a micro capsule, this capsule calls Magnetic Particle Micro Capsule (MPMC).

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