为了解决先驱体转化陶瓷法中金属粉末活性填料在制备陶瓷涂层中分散不均的问题,采用激光裂解钛酸四丁酯改性聚二甲基硅氧烷法在金属基体表面制备陶瓷涂层,通过电子显微镜、X射线衍射和X射线光电子能谱等手段,取得了涂层表面并分析了激光裂解钛酸四丁酯改性聚二甲基硅氧烷生成物的组成与结构。结果表明,钛酸四丁酯添加量的质量分数为0.05时,涂层表面不同区域的Ti相对含量均在3%左右,Ti元素在涂层中分布均匀,钛酸四丁酯改性聚二甲基硅氧烷在激光作用下生成的陶瓷涂层主要由晶态的SiC,TiO2,非晶态SiO2,(TiO2)56(SiO2)44以及C6H18OSi2等组成,激光裂解过程中新生的TiO2,(TiO2)56(SiO2)44等陶瓷相对所制备的陶瓷涂层表面孔隙具有填补作用,使陶瓷涂层表面均匀平整致密,孔隙、缝隙基本消失,解决了金属粉末活性填料的分散问题。

In order to solve the problem that metallic powder active fillers were easily dispersed nonuniformly while preparing ceramic coatings by polymer derived ceramics method, the ceramic coating was prepared by laser pyrolysis of polydimethylsiloxane modified by butyl titanate. The composition and structure of products were analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that, while the mass fraction of the addition of butyl titanate is 0.05, the relative content of Ti element in different areas of coatings is about 3% and Ti element disperses uniformly in ceramic coating. Under the action of high energy laser, the ceramic coating generated from the polydimethylsiloxane modified by butyl titanate is composed of crystalline SiC and TiO2, as long as amorphous SiO2, (TiO2)56(SiO2)44 and C6H18OSi2. The formation of new ceramic phase such as TiO2 and (TiO2)56(SiO2)44 can fill the pores and lead to the less porosity of the ceramic coating, and make the coating surface uniform and densified. The study solves the dispersion of active filler of metal powder.