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通过激光裂解含Ti粉聚二甲基硅氧烷先驱体,制备了陶瓷涂层,并分析了裂解产物的组成与结构。结果表明,在高能激光作用下,Ti粉与聚二甲基硅氧烷发生自由基反应,生成由晶态的SiC、TiC、TiO2和非晶态SiO2、单质C、C6H18OSi2组成的复相陶瓷涂层。新生的TiO2和TiC陶瓷相能填补陶瓷涂层的孔隙,使涂层表面平整,孔隙减少。金属Ti粉的加入还有利于降低复相陶瓷涂层中自由碳的质量分数,当添加的Ti粉质量分数为5.0%时,涂层中Si、O和C元素质量分数分别达到74.44%、16.48%和6.19%。
The ceramic coating was prepared by laser pyrolysis of Ti powder-containing polydimethylsiloxane precursor, and the composition and structure of the cracked product were analyzed. The results show that Ti powder and polydimethylsiloxane undergo free radical reaction under the action of high-energy laser to form a multi-phase ceramic coating composed of crystalline SiC, TiC, TiO2 and amorphous SiO2, simple substance C and C6H18OSi2 Floor. The newborn TiO2 and TiC ceramic phase can fill the pores of the ceramic coating, the coating surface is flat and the porosity is reduced. The addition of Ti powder also helps to reduce the mass fraction of free carbon in the multi-phase ceramic coating. When the content of Ti powder is 5.0%, the mass fraction of Si, O and C in the coating reaches 74.44% and 16.48% % And 6.19%.