IEEE Trans Ultrason Ferroelectr Freq Control. 2022 Nov;69(11):3070-3080. doi: 10.1109/TUFFC.2022.3176488. Epub 2022 Nov 2.
Structural health monitoring (SHM) is growing rapidly with strong demand from industrial automation, digital twins, and Internet of Things (IoT). In contrast to the manual installation of discrete devices, piezoelectric transducers by directly coating and patterning the piezoelectric materials on the engineering structures show the potential for achieving SHM function with improved benefits over cost. Until the recent years, high-performance lead-free piezoelectric ceramic coatings, including potassium-sodium niobate (KNN) and bismuth sodium titanate (BNT)-based coatings, are produced by thermal spray method. This article reviews the background and progresses of using thermal spray method for fabricating piezoelectric ceramic coatings and their values for SHM applications. The review shows the combination of environmentally friendly lead-free compositions, and the scalable thermal spray processing method opens substantial application opportunities. Ultrasonic SHM technology enabled by thermal-sprayed piezoelectric ceramic coatings is an important area where the lead-free piezoelectric ceramic materials can play with their technical competitiveness and commercial values over the lead-based compositions.
结构健康监测（SHM）随着工业自动化、数字孪生和物联网（IoT）的强烈需求而迅速发展。与离散设备的手动安装相比，通过直接在工程结构上涂覆和图案化压电材料的压电传感器显示出了实现 SHM 功能的潜力，在成本效益方面具有显著优势。直到最近几年，包括铌酸钾钠（KNN）和钛酸铋钠（BNT）基涂层在内的高性能无铅压电陶瓷涂层才通过热喷涂方法生产。本文综述了使用热喷涂方法制造压电陶瓷涂层的背景和进展，以及它们在 SHM 应用中的价值。综述表明，环保型无铅成分的结合，以及可扩展的热喷涂加工方法为其提供了大量的应用机会。热喷涂压电陶瓷涂层所实现的超声波 SHM 技术是一个重要领域，在这个领域中，无铅压电陶瓷材料可以凭借其技术竞争力和商业价值超越含铅成分的材料。
