FeCr/Al_(2)O_(3)复合涂层的制备及其高温电磁性能研究  

Preparation and high-temperature and wideband electromagnetic wave absorption of FeCr/Al_(2)O_(3) composite coatings

作　　者：梁鑫 郑玉 仲星屹 王昕[2] 张晨[2] 李洁[2] LIANG Xin;ZHENG Yu;ZHONG Xinyi;WANG Xin;ZHANG Chen;LI Jie(Chengdu Aircraft Industry(Group)Co.Ltd.,Chengdu 610091,China;University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]成都飞机工业(集团)有限责任公司,四川成都610091 [2]电子科技大学,四川成都611731

出　　处：《电子元件与材料》2022年第11期1165-1172,共8页Electronic Components And Materials

摘　　要：传统电磁功能涂层所使用的聚合物粘结剂在高温下将发生分解,难以满足高温应用需求。为实现电磁功能涂层在高温下的服役应用,采用大气等离子喷涂技术成功制备出一种具有层状FeCr合金结构的FeCr/Al_(2)O_(3)合金/陶瓷复合涂层,并对其电磁性能和高温结构稳定性进行了系统研究。结果表明,涂层具有均匀一致的双相结构,同时具有较强的磁性,涂层的静态磁性能和电磁性能随FeCr合金含量的变化而变化。当FeCr体积分数为5%时,涂层的ε′从11.65上升到了11.99,ε″从0.002上升到0.014。涂层在600℃下能够进一步晶化减少内部缺陷,当FeCr体积分数为15%时,涂层的ε′从35.5下降至28.5,ε″从2.5下降至1.5,分析原因主要是由于电磁场中的弛豫极化响应时间随温度的升高而减少。Traditional electromagnetic functional coatings is difficult to meet the needs of high-temperature applications since the polymer binders would decompose at high temperatures.In order to realize the application of electromagnetic functional coating at high-temperature,an novel FeCr/Al2 O3 composite coating with laminated FeCr alloy particle was designed and prepared using atmospheric plasma spraying,and its electromagnetic performance and high temperature stability were systematically studied.The results show that the coating has uniform and consistent duplex structure with strong magnetism,and static magnetic properties and electromagnetic properties of the coating vary with the content of FeCr alloy.ε′andε″of 5%FeCr/Al_(2)O_(3) coating increased from 11.65 to 11.99 and 0.002 to 0.014,respectively.After 100 h high temperature test at 600℃,ε′andε″of 15%FeCr/Al2 O3 coating decreased from 35.5 to 28.5 and 2.5 to 1.5,respectively.The reason is that the relaxation polarization time of the coating increased with increasing temperature in the electromagnetic field.

关 键 词：高温电磁性能 大气等离子喷涂 抗氧化性 弛豫极化 复介电常数 

分 类 号：TB34[一般工业技术—材料科学与工程]