压电传感器关键材料高温辐照耦合场下性能仿真分析

Simulation and Computational analysis of Mechanical and Electrical Properties of Key Materials for Piezoelectric Vibration Sensors under High-temperature Irradiation Coupling Field

摘要:

核电厂泵、阀、驱动机构等关键设备安全、稳定、可靠运行迫切需要性能稳定的压电传感器，而压电陶瓷是传感器的关键材料。为掌握压电陶瓷材料在高温辐照耦合场下力学与电学性能的变化规律，采用γ射线辐照模型、原子位移损伤仿真分析模型和分子动力学模型建立了压电陶瓷材料辐照仿真模型，对其在300K、573K、755K和800K温度，以及10eV、30eV、50eV不同初级碰撞原子（PKA）下的力学与电学性能进行了研究。经仿真计算分析发现压电陶瓷材料在高温与高辐照剂量耦合场下产生了较多的缺陷，材料的机械性能与电学性能发生一定的变化，进而导致了压电陶瓷材料的损伤与压电性能发生变化。该成果可用于压电陶瓷材料在高温辐照耦合场下性能变化特性分析，并为用于高温高辐照环境下压电传感器的研制提供理论支撑。

Abstract:

The safe, stable and reliable operation of pumps, valves, drive mechanisms and other key equipment in nuclear power plants is in urgent need of piezoelectric sensors with stable performance, and piezoelectric ceramics is an important material for sensors. In order to obtain the rule of change of mechanical and electrical properties of piezoelectric ceramic materials under high-temperature irradiation coupling field, γ-ray irradiation model, atomic displacement damage simulation and analysis model and molecular dynamics model were adopted to establish the irradiation simulation model of piezoelectric ceramic materials, which were studied at different temperatures of 300K, 573K, 755K, and 800K, and at different primary knock-on atoms (PKA) of 10 eV, 30eV, and 50 eV. The simulation calculations and analysis revealed that the piezoelectric ceramic materials produced more defects under the coupling field of high temperature and high irradiation dose, and the mechanical and electrical properties of the materials experienced certain changes, which in turn led to the damage and piezoelectric properties of the piezoelectric ceramic materials changed. The results can be used for the characterization of piezoelectric ceramic materials under high temperature irradiation coupling field, and provide theoretical support for the development of piezoelectric sensors used in high temperature and high irradiation environment.