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Vol.4 No.1 previous AA 39 -40-SP6(41-42-43-44)-NT 46 -47

Academic Articles
Regular Paper Vol.4No.2 (2012) p.56 - p.62
 

Fabrication of Micro Capsule Containing Fluorescent Magnetic Particles for Advanced Inspection of Heat Exchanger Tubes

 
Fuyumi ITO 1, * Akihiko NISHIMURA1
 
1 Japan Atomic Energy Agency, Kansai Photon Science Institute 8-1 Umemidai, Kizugawa, Kyoto, 619-0215, Japan
 
Abstract
Stress Corrosion Cracking (SCC) sometimes occurs in the heat exchanger tubes of aging nuclear power plants. Magnetic particle Testing (MT) is used to facilitate visual observation on SCC. The MT was improved by the micro capsules which were containing both fluorescent pigment and magnetic particles. The magnetic particle micro capsules (MPMC) were fabricated by liquid mixture synthesis in various magnetic particle weight concentrations. MPMCs with < 10 wt% successfully maintained the spherical shape. MPMCs with 2 wt% and 6.7 wt% MPMCs were drawn around the electromagnet poles. Furthermore these capsules were easy to be confirmed by shining on side illumination. The proposed MPMC will be useful for MT to inspect the SCC symptom
 
Keywords
magnetic particle inspection, heat exchanger tube, crack, micro capsule, emulsion, density matching, line of magnetic force, leakage magnetic flux, a laser defect-processing head
 
Full Paper: PDF EJAM Vol.4No. 2 pp.56-62 "Fabrication of Micro Capsule Containing Fluorescent Magnetic Particles for Advanced Inspection of Heat Exchanger Tubes
Article Information
Article history:
Received 3 Feb 2012
Accepted 4 June 2012