Abstract:
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 TiO
2, as long as amorphous SiO
2, (TiO
2)
56(SiO
2)
44 and C
6H
18OSi
2. The formation of new ceramic phase such as TiO
2 and (TiO
2)
56(SiO
2)
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.