摘要
在模拟服役温度条件下研究FeSi合金粉末/有机硅树脂吸波涂层微观形貌结构和力学性能的演变规律,对优化提升涂层性能和预测涂层服役寿命具有重要意义。本工作采用空气冷喷涂工艺制备了FeSi合金粉末/有机硅树脂吸波涂层,在400℃下分别对吸波涂层进行了10次、20次、30次、40次、50次的热循环处理,采用多种分析检测手段,研究了热处理对吸波涂层的微观形貌、物相组成、官能团、硬度及结合强度等方面的影响。结果表明,在400℃下吸波涂层质量损失仅0.12%,即涂层耐热性能良好,形貌结构比较稳定。随着热循环处理次数的增加,涂层表面显微硬度从室温的17.32HV1±0.57HV1增加到热处理循环10次后的34.01HV1±0.75HV1;当热循环次数继续增加时,涂层表面硬度趋于稳定。吸波涂层的结合强度则随着热循环次数的增加逐渐下降,热循环40次后,涂层结合强度下降至(1.95±0.60)MPa。涂层发生氧化交联反应以及涂层和基底热膨胀系数不匹配产生的热应力累积是影响热循环处理过程中吸波涂层力学性能的主要原因。
It is important to study the microstructure and mechanical properties of FeSi alloy powder/silicone resinmicrowave absorbing coatings under the simulated service temperature conditions to optimize the coating performances and predict their service life.In this work,the microwave absorbing coatings were prepared by air-cooled spraying process,and they were subjected to 10,20,30,40 and 50 thermal cycles at 400℃.The results of thermogravimetric analysis showed that the mass loss of microwave absorbing coating at 400℃was only 0.12%.It meant that the coating had good heat resistance and stable morphological structure.With the increase of thermal cycles,the surface hardness of the coating increased from 17.32HV1±0.57HV1 at room temperature to 34.01HV1±0.75HV1 after 10 cycles.When thermal cycles continued to increase,the surface hardness of the coating stabilized.The bonding strength of the microwave absorbing coating gradually decreased with the increase in thermal cycles,decreasing to(1.95±0.60)MPa after 40 thermal cycles.The main reasons may be the oxidative cross-linking reaction of the coating and the accumulated thermal stress due to mismatch,which damaged the mechanical properties of the microwave absorbing coatings during thermal cycling.
作者
钟镇涛
洪森
邓妍
何泽乾
戴翠英
毛卫国
张有为
刘平桂
ZHONG Zhentao;HONG Sen;DENG Yan;HE Zeqian;DAI Cuiying;MAO Weiguo;ZHANG Youwei;LIU Pinggui(School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,Hunan,China;School of Materials Science and Engineering,Changsha University of Science&Technology,Changsha 410014,China;Stealth&Coatings Institute,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第20期191-197,共7页
Materials Reports
基金
国家科技重大专项(J2019-Ⅵ-0017-0132,J2022-Ⅵ-0008-0039)
国家重点研发计划(2021YFB3702304-4)。
关键词
FeSi合金粉末
吸波涂层
热膨胀系数
硬度
结合强度
FeSi alloy powder
microwave absorbing coating
thermal expansion coefficients
hardness
adhesive strength
