吸波涂层大部分是以有机材料为载体,在其中添加导体(如W,Mo)或半导体材料(如SiC,TiC,TiO2 ),然而,有机载体的高温耐受温度不超过200 ℃,高温热稳定性很差。一般无机材料的高温耐受性较好,其中研究较多的几种材料包括TiC、TiO2 以及通过不同手段制备的SiC 等。为了提高吸波涂层的耐热性能,文中实验采用Mg-Al-Si 系微晶玻璃作为基体材料,通过向微晶玻璃中加入不同吸波介质材料,包括含量相同的TiC、TiO2 以及干法制备的SiC 和通过湿法制备的SiC;对比了相同含量,不同吸波材料的介电性能;探究了作为吸波涂层材料吸波能力较强的介质材料。结果表明:TiC 在X 波段和Ku 波段的吸波能力都较为突出,并且比不同制备方式的SiC 的吸波能力强。通过显微结构的表征发现,在微晶玻璃中的TiC 材料分布均匀,颗粒细小,有利于材料吸波。经过测试,试验制得的样品可在800 ℃的空气中反复使用,介电性能无明显变化,具有较好的的高温热稳定性和抗氧化性。

Most of the microwave absorbing coatings are supported by organic materials, in which conductors (such as W,Mo)or semiconductor materials(such as SiC,TiO2,TiC). However the high temperature tolerance of the organic carriers is not more than 200 ℃, and the high temperature thermal stability of the organic carriers is poor. In order to improve the heat-resistant of wave absorbing coating, this experiment adopted glass-ceramic consist of Mg-Al-Si as a matrix, by adding the absorbing material into it, including TiC,TiO2,SiC and SiC prepared by sol-gel method, compared the dielectric properties of different wave absorbing materials with the same content. The experimental shows that whether in the X band or in the Ku band, TiC has the best ability for absorbing waves which better than SiC with prepared by different ways. It is found that TiC in glass-ceramic is uniformly distributed with fine particles, which is beneficial to absorbing wave. And the results show that the sample can be repeatedly used in 800 ℃ of air, also there is no significant decrease in dielectric properties and have certain high temperature tolerance. This means that the material has good high temperature thermal stability and autoxidation ability.

TM277