• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2026, Vol. 62 ›› Issue (10): 83-92.doi: 10.3901/JME.260493

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High Temperature Long-term Online Ultrasonic Monitoring Based on CCBT Piezoelectric Ceramic Transducers

YANG Zhen, LI Jian, ZHAO Kefeng, CHEN Zhicheng, HU Zheng, QIU Xunlin, XIANG Yanxun   

  1. School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237
  • Received:2025-05-05 Revised:2025-12-18 Published:2026-07-29

Abstract: 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.

Key words: bismuth layered piezoelectric ceramics, piezoelectric ultrasonic transducer, ultrasonic monitoring, high-temperature online monitoring, high-temperature ultrasonic velocity correction

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