文献类型：期刊文献

中文题名：基于 CCBT 压电陶瓷换能器的高温长时在线超声监测

英文题名：High Temperature Long-term Online Ultrasonic Monitoring Based on CCBT Piezoelectric Ceramic Transducers

作者：Yang, Zhen[1]; Li, Jian[1]; Zhao, Kefeng[1]; Chen, Zhicheng[1]; Hu, Zheng[1]; Qiu, Xunlin[1]; Xiang, Yanxun[1]

机构：[1] School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2026

卷号：62

期号：10

起止页码：83

外文期刊名：Jixie Gongcheng Xuebao/Journal of Mechanical Engineering

收录：EI(收录号：20263221264509)

语种：中文

外文关键词：Bismuth - Crack propagation - Crystallography - Failure (mechanical) - Piezoelectric transducers - Ultrasonic scattering - Ultrasonic testing

摘要：Long-term service of pressure equipment under high-temperature conditions and fluid erosion can easily induce material damage such as crack initiation and propagation. Sudden appearance of cracks caused by various factors may rapidly lead to operational failure and catastrophic consequences. To address the challenge of timely detection of abrupt defects in high-temperature equipment through conventional periodic shutdown inspections, a high-temperature resistant piezoelectric ultrasonic transducer is successfully developed based on a Ce-doped bismuth-layered piezoelectric ceramic (Ce-CaBi4Ti4O15, CCBT). Experimental results demonstrate that CCBT exhibits a Curie temperature of 790 ℃. Within the temperature range from room temperature to 450 ℃, its piezoelectric d33 coefficient and DC resistivity remain at 22 pC/N and 250 kΩ·m, respectively, showing excellent thermal stability. The coefficient of thermal expansion (10.45×10?6/℃) closely matches that of common high-temperature equipment materials such as carbon steel and nickel-chromium steel, effectively preventing structural failure caused by thermal stress. By integrating CCBT transducers with a self-developed ultrasonic monitoring system and implementing high-temperature sound velocity correction, the system achieved long-term precise monitoring of 1 mm through-hole defects in P92 steel specimens at 460 ℃, with detection errors below 2% and a mean time between failures(MTBF) of 1 008 hours. The proposed monitoring technology demonstrates outstanding high-temperature stability and detection accuracy, offering a potential solution for continuous in-service non-destructive monitoring of high-temperature equipment. ? 2026 Chinese Mechanical Engineering Society. All rights reserved.