【摘 要】
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Background, Motivation and Objective Thermal power generation increased its share up to ~88％ in 2013 Japan due to shutdown of nuclear power plants so that maintenance of thermal power plants becomes t
【机 构】
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Kumamoto University, Japan Tokyo University of Sc
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Background, Motivation and Objective Thermal power generation increased its share up to ~88％ in 2013 Japan due to shutdown of nuclear power plants so that maintenance of thermal power plants becomes the critical issues since unexpected shutdown could cause huge economical loss. On-line monitoring during operation has been desired since it can reduce risk of unexpected shutdown and periodical shutdown time for maintenance. Ultrasonic testing is mainly used because it can detect internal defects however, on-line monitoring for thermal power generation is difficult due to high temperatures such as 550°C. Sol-gel composite ultrasonic transducers can operate high temperatures and Mn-doped CaBi4Ti4O15 (CBT)/Pb(Zr,Ti)O3 (PZT) sol-gel composites has been developed for nondestructive testing above 500°C to improve sensitivity and signal-to-noise ratio high temperatures and it demonstrated comparable performance with Bi4Ti3O12 (BiT)/PZT at 550°C, though long-term monitoring test is necessarily to evaluate on-line monitoring capability.
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