等离子喷涂纳米Al2O3-13%TiO2陶瓷涂层的工艺研究
Research on Process for Plasma Sprayed Al2O3-13%TiO2 Ceramic Coatings
徐心洁, 贺 毅, 马东林
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作者单位：(西华大学 材料科学与工程学院, 四川 成都 610039)
中文关键字：热震性能； Al2O3-13%TiO2； 等离子喷涂； 纳米陶瓷； 工艺参数
英文关键字：thermal shock; Al2O3-13%TiO2; plasma spray; nano ceramic coating; process parameters
中文摘要：采用正交实验方法对等离子喷涂纳米Al2O3-13%TiO2陶瓷涂层的电压、电流及主气流量进行优化设计，并利用SEM、XRD对纳米Al2O3-13%TiO2复合粉和涂层进行检测和分析。结果表明，影响涂层热震性能的因素主次关系是电流>电压>主气流量；优化后的喷涂参数为电压60 V，电流450 A，主气流量40 L/min，优化后纳米涂层的熔融、涂覆状态有所改善。喷涂时涂层中生成了γ-Al2O3，增加了涂层内的孔隙率，同时，Rutile-TiO2相转变成Brookite- TiO2相，增加了涂层中的内应力，加剧了裂纹的扩展，降低了涂层的抗热震性能。
英文摘要：The main plasma spraying process parameters, such as voltage, current and main gas flow rate, were optimized by orthogonal experiment. Nano-structured Al2O3-13%TiO2 powder and coating were checked and analyzed by metallmicroscope, SEM and XRD. The results show that the current and voltage have more effect on the ability of thermal shock assistance of the coating than main gas flow rate. The optimum process parameters are 60 V, 450 A and 40 L/min. After optimization, the melting state of the surface coating is better. The generated γ-Al2O3 during spraying increases the porosity of the coating. Rutile-TiO2 is transformed into Brookite-TiO2, which increase innerstress, aggravates the expansion of longitudinal crack and reduces the ability of thermal shock assistance of the coating.