热处理工艺对HOVF制备磁致伸缩涂层组织及性能的影响  

Effect of heat treatment process on the microstructure and properties of magnetostrictive coating prepared by HOVF

作　　者：戚青丽 沈功田[1] 郑阳[1] 潘晴川[1] 黄松岭[2] QI Qingli;SHEN Gongtian;ZHENG Yang;PAN Qingchuan;HUANG Songling(China Special Equipment Inspection and Research Center, Beijing 100013, China;Department of Electrical Engineering of Tsinghua University, Beijing 100084, China)

机构地区：[1]中国特种设备检测研究院,北京100029 [2]清华大学电机系,北京100084

出　　处：《功能材料》2022年第3期3206-3209,共4页Journal of Functional Materials

基　　金：国家重点研发计划“公共安全风险防控与应急技术装备”重点专项项目(2018YFC0809002);中国特种设备检测研究院青年基金项目(2020内01)。

摘　　要：采用超音速火焰喷涂方法制备Fe-Ga磁致伸缩涂层作为磁致伸缩导波传感器的敏感性元件。研究300~700℃不同热处理温度对Fe-Ga涂层质量的影响,采用SEM、XRD和磁致伸缩测试仪研究热处理过程中涂层的微观组织和性能变化。结果表明,退火过程中,Fe-Ga涂层保持单一的A2相结构,300~600℃温度范围内颗粒中的变形晶粒逐渐发生了回复再结晶,到700℃发生完全的回复再结晶;磁致伸缩性能随热处理温度的升高而升高,对应地饱和磁场逐渐降低,700℃退火后磁致伸缩达46×10^(-6)。研究表明,适当的退火处理工艺可以改善磁致伸缩性能,对制备高效换能材料具有一定的指导意义。Fe-Ga magnetostrictive coating is prepared by high velocity oxy-fuel spraying(HVOF)process as a sensitive element in magnetostrictive guided wave sensors.The effects of different heat treatment temperatures from 300℃to 700℃on the quality of Fe-Ga coatings are investigated,and the microstructure and properties of the coatings are analyzed by SEM,XRD and magnetostrictive tester.Results show that the Fe-Ga coating maintains a single A2 phase structure during the heat treatment process.The deformed grains in the particles gradually recrystallize at the temperature ranging from 300 to 600℃,and completed recrystallization occurs at 700℃.The magnetostrictive properties increase with the increase of heat treatment temperature,and the corresponding saturation magnetic field gradually decreases.The maximum magnetostriction reaches 46 ppm with the coating annealed at 700℃.This study shows that appropriate annealing process can improve the magnetostrictive properties,which is a guideline for the preparation of high-efficiency transducer materials.

关 键 词：超音速火焰喷涂 Fe-Ga涂层 热处理 微观组织 磁致伸缩性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]