Abstract: The ceramic coatings were prepared by laser pyrolysis of aluminium-containing polysiloxane . The formation and structure of the product were characterized by scanning electron microscopy (SEM), X-ray diffraction ( XRD) and X-ray photoelectron spectroscopy ( XPS).The results show that the chemical valence of Al has a great influence on the morphology of the ceramic coating prepared by laser pyrolysis of polysiloxane.During the laser pyrolysis process, Al react with the C, O and Si of polysiloxane and generate new ceramic phase .Crystalline Al0.2 Si0.8 O2.2 and amorphous Al2 O3 ceramic phase are generated with the addition of Al particles , while amorphous Al2O3 and AlOx ceramic phase are generated by adding aluminum isopropoxide into the polysiloxane .The new ceramic phase leads to the less porosity of the ceramic coating and makes the coating surface uniform and densified via filling the pores .

Key words: The ceramic coatings were prepared by laser pyrolysis of aluminium-containing polysiloxane . The formation and structure of the product were characterized by scanning electron microscopy (SEM), X-ray diffraction ( XRD) and X-ray photoelectron spectroscopy ( XPS).The results show that the chemical valence of Al has a great influence on the morphology of the ceramic coating prepared by laser pyrolysis of polysiloxane.During the laser pyrolysis process, Al react with the C, O and Si of polysiloxane and generate new ceramic phase .Crystalline Al0.2 Si0.8 O2.2 and amorphous Al2 O3 ceramic phase are generated with the addition of Al particles , while amorphous Al2O3 and AlOx ceramic phase are generated by adding aluminum isopropoxide into the polysiloxane .The new ceramic phase leads to the less porosity of the ceramic coating and makes the coating surface uniform and densified via filling the pores .