不同形态的铝对激光裂解聚硅氧烷制备SiAlCO陶瓷涂层的影响

采用激光裂解含Al聚硅氧烷法制备陶瓷涂层,通过扫描电子显微镜(SEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等手段,分析了激光裂解含Al聚硅氧烷生成物的组成与结构.结果表明,Al元素的化学价态对激光裂解聚硅氧烷制备的涂层形貌有非常大的影响.在激光裂解含Al聚硅氧烷过程中,Al与聚硅氧烷中的C、O、Si发生反应产生新生陶瓷相,但加入Al粒子时生成晶态Al0.2Si0.8O2.2和非晶态Al2O3陶瓷相,加入异丙醇铝时生成非晶态的Al2O3和AlOx陶瓷相.新生陶瓷相对所制备的陶瓷涂层表面孔隙具有填补作用,使陶瓷涂层表面平整致密,孔隙、缝隙基本消失.

Effect of Different Forms of Aluminum on SiAlCO Ceramic Coating Prepared by Laser Pyrolisis Polysiloxane

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 .