溶胶凝胶法制备钢基陶瓷复合涂层及其性能研究

发布时间：2018-06-16 03:04

  本文选题：陶瓷涂层 + 溶胶凝胶法　； 参考：《长江大学》2017年硕士论文

【摘要】：本论文简要地综述了金属基陶瓷复合涂层的研究现状和溶胶凝胶法制备金属基陶瓷复合涂层的研究现状,并对溶胶凝胶法制备钢基陶瓷涂层的技术进行分析。利用改变用量和正交试验相结合的试验方法,选择溶胶凝胶法制备钢基陶瓷复合涂层的配方和固化工艺;利用扫描电镜(SEM)、能谱仪(EDX)和X射线衍射(XRD)来进行陶瓷复合涂层成分研究及微观组织结构观察,分析研究微观组织结构和截面结合机理;对钢基陶瓷复合涂层的性能进行测试和分析,根据测试结果,分析钢基陶瓷复合涂层的耐磨性、结合强度、抗热震性和耐腐蚀性。通过多次试验得出:采用溶胶凝胶法在Q235钢基体表面制备性能优良的陶瓷复合涂层是可行的。陶瓷复合涂层的配方:陶瓷骨料氧化铝、二氧化硅和氧化铬配比为4:3:1,复合溶胶水玻璃和硅溶胶配比7:3,陶瓷骨料和复合溶胶配比1:1.2;陶瓷复合涂层的固化工艺:涂层浆料放置时间为30分钟,并隔5分钟充分搅拌一次,固化方式为开始升温90℃,保温2小时,再次升温300℃,保温一个小时,再升温到400℃,以每分钟升温1-2℃,直到700℃,保温十分钟后随炉冷却。通过扫描电镜、能谱仪和X射线衍射的结果与分析,陶瓷复合涂层有Fe2Al4Si5018、NaAl(SiO3)2、Fe2SiO4、FeSi和Al86Cr14等新相;陶瓷复合涂层表面质量较好,气孔较少,致密性较好;陶瓷复合涂层和Q235钢基体界面有化学作用、吸附作用、机械作用和扩散作用,这些作用相互补充,有效地提高陶瓷复合涂层和钢基体结合强度。根据陶瓷复合涂层的性能测试结果,溶胶凝胶法在Q235钢基体制备的陶瓷复合涂层比Q235钢基体的耐磨性提高了3.2倍;陶瓷复合涂层和Q235钢基体的平均结合强度为3.3MPa,陶瓷复合涂层自身平均结合强度0.85MPa,陶瓷复合涂层与钢基体有良好的结合强度;在600℃、700℃、800℃、900℃抗热震试验中,陶瓷复合涂层抗热震次数分别为31次、24次、19次、7次,陶瓷复合涂层有良好的抗热震性能;陶瓷复合涂层耐酸性、耐碱性和耐盐性比Q235钢分别提高8-9倍、6-7倍、3-4倍,比1Cr18Ni9不锈钢分别提高2-3倍、2-3倍、2倍,陶瓷复合涂层能有效的提高基体的耐腐蚀性能。
[Abstract]:In this paper, the research status of metal-based ceramic composite coating and sol-gel preparation of metal-based ceramic composite coating are briefly reviewed, and the technology of preparing steel based ceramic coating by sol-gel method is analyzed. The formula and curing process of the composite coating prepared by sol-gel method were selected by the combination of changing dosage and orthogonal test. The composition and microstructure of ceramic composite coatings were studied by means of SEM, EDX and XRD. The microstructure and cross-section bonding mechanism of ceramic composite coatings were analyzed and studied by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The properties of steel based ceramic composite coating were tested and analyzed. According to the test results, the wear resistance, bonding strength, thermal shock resistance and corrosion resistance of steel based ceramic composite coating were analyzed. The results show that it is feasible to prepare ceramic composite coatings on Q235 steel by sol-gel method. Ceramic composite coating formulation: ceramic aggregate alumina, The ratio of silica to chromium oxide is 4: 3: 1, the ratio of composite sol, water glass and silica sol is 7: 3, and the ratio of ceramic aggregate and composite sol is 1: 1.2. The curing process of ceramic composite coating is as follows: the coating slurry is placed for 30 minutes, and the mixture is stirred at full intervals of 5 minutes. The curing method is to start at 90 鈩，

本文编号：2024952