吸波涂层失效因素研究

发布时间：2018-05-06 05:25

本文选题：吸波涂层 + 失效　；参考：《表面技术》2015年07期

【摘要】：目的研究吸波涂层因物理和化学损伤而导致的失效原因,用于评估吸波涂层的寿命,指导吸波涂层的功能结构优化,提高吸波涂层的使用寿命。方法通过高低温振动双结合、加速人工老化试验等方法和分析涂层失效前后的微观形貌、组成元素,对导致吸波涂层失效的多种因素进行试验验证。结果在固化阶段和高低温振动条件下,涂层因内应力变化导致开裂脱落;在紫外线照射和盐雾作用下,涂层因氧化和盐雾渗透导致粉化、鼓泡。结论建立了吸波涂层失效体系及失效因子,得到影响涂层实效的因素主要为:涂层厚度、附着力、致密度、有机成膜物功能键特性、吸收剂氧化活性等。在吸波涂层设计中,应采用低交联度树脂,降低因固化反应带来的内应力增加;通过减薄增韧,提高涂层的耐高低温交变和振动性能;通过设计耐腐蚀屏蔽层和在表面涂覆高耐侯保护层,提高吸波涂层在大气和介质腐蚀下的使用寿命。
[Abstract]:Objective to study the failure reasons of absorbing coatings due to physical and chemical damage, to evaluate the life of absorbing coatings, to guide the optimization of the functional structure of absorbing coatings and to improve the service life of absorbing coatings. Methods by double combination of high and low temperature vibration, accelerated artificial aging test and so on, the microstructure and composition of the coating before and after failure were analyzed, and many factors leading to the failure of the absorbing coating were tested and verified. Results during the curing stage and under high and low temperature vibration conditions, the coating was cracked and shed due to the change of internal stress, while under the action of ultraviolet radiation and salt spray, the coating was powdered and bubbled due to oxidation and salt spray penetration. Conclusion the failure system and failure factor of absorbing coating are established. The main factors influencing the effectiveness of the coating are: coating thickness, adhesion, density, functional bond characteristics of organic film, oxidation activity of absorbent and so on. In the design of microwave absorbing coating, low crosslinking resin should be used to reduce the increase of internal stress caused by curing reaction, and the resistance to high and low temperature alternation and vibration of the coating should be improved by reducing the thickness and toughening. The corrosion resistant shielding layer and the high resistance protective layer are designed to improve the service life of the absorbing coating under atmospheric and medium corrosion.
【作者单位】：西南技术工程研究所;
【分类号】：TG174.4

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