【作者】 范志国；

【导师】 王飚；

【作者基本信息】 昆明理工大学 ， 材料加工工程， 2004， 硕士

【摘要】 本文主要介绍了用等离子喷焊法制备Al2O3-MxOy硬面陶瓷复材的技术，同时也简要介绍了涂覆烧结法在基材(A3钢)上制备多元氧化物复合陶瓷涂层的技术。通过采用大型金相显微镜、x-射线衍射仪、电子探针等设备分析了陶瓷涂层的相结构、相组成、组织特征以及陶瓷涂层中各元素的分布情况。本试验不仅在实验室中模拟磷化工生产工况进行了小试样的分析和研究，而且还采用等离子喷焊法和涂覆烧结法完成了两块中试生产应用复材的制备，并且把采用两种方法制备的混化搅拌桨叶片同时应用到磷化工生产现场，与现有的磷化工设备的抗腐蚀、磨损的工艺进行比较。小试样试验分析表明：金属基体、预涂层、过渡涂层以及多元氧化物陶瓷涂层之间存在比较清晰的分界面，涂层由无数变形颗粒及孔隙组成层状结构。陶瓷涂层的相结构主要为固溶体β一Al2O3·TiO2，同时存在亚稳相γ-Al2O3、 稳定相α-Al2O3和金红石TiO2。通过引入了预涂层和过渡涂层，缓解了陶瓷与金属性能的差异，增加了涂层之间的结合强度，降低了喷涂后涂层中的残余应力。在氧化铝粉末中加入的其它陶瓷粉末(如：TiO2，SiO2，B2O3，Na2O，MgO)，不仅使得陶瓷粉末的喷涂具有良好的喷焊工艺性能，而且制备的陶瓷涂层与基材(A3钢)相比，具有较高的硬度、结合强度、耐蚀性和耐腐蚀磨损性。并且，由于喷涂后对陶瓷涂层采取了重熔处理，使陶瓷涂层与基材达到了牢固的冶金结合，进一步增强了涂层之间的结合强度，降低了孔隙度，增强了陶瓷涂层的抗腐蚀、磨损的能力。总之，等离子喷焊法制备的陶瓷涂层的质量与许多因素有关，其中包括：涂层设计、喷涂设备、喷涂工艺参数、陶瓷粉末的性能以及陶瓷涂层与基体的结合机理。更多还原

【Abstract】 The preparing of Al2O3-MxOy hard-faced ceramic composites had been carried out by means of plasma thermal spraying and the poly-oxides ceramic coating was prepared on the substrate by means of coating and sintering method. The phase structure,phase compositions,micro-structure characteristic and elements distribution of the Al203-MxOy hard-faced ceramic coating were analyzed by using large-field optical microscope and X-ray diffraction and electric probe . The small experiments simulated the producing conditions of phosphor chemistry and the small samples in the laboratory were analyzed .Two middle-scale materials were prepared by using the plasma spraying weld method and the coating and sinering method. Furthermore, the vanes of phosphor chemistry blender prepared by these two methods were applied to the producing of phosphor chemistry in order to improve the wear resistance and corrosion resistance properties of phosphor chemistry equipments.The test of these small samples revealed: there are clear interfaces between the metal substrate, the previous coating, the transitional coating and the final coating, the coating characterized by layer structure that was composed by countless anamorphic grains and holes. The test from X-rays diffraction revealed that the phases of ceramics coating were composed by the solid solution B-Al2O3.TiO2,meta-stable Y- Al2O3,stable a-A12O3 and TiO2.Because of using the previous coating and transional coating, the properties differences between metals and ceramics were reduced and the bonding strength was improved and the residual stress in the coating was reduced. The ceramic coating had better plasma thermally sprayed properties when other ceramic powder (for example:TiO2,Si02,B203, Na20, MgO) were mixed in the A1203. Besides the ceramic coating possessed higher compactness, hardness, bonding strength and better wear resistance and corrosion resistance than the substrate (A3 steel) . Furthermore, because of the scanning remelting the coating after spraying, there were firm metallurgy bond that increased the bonding strength and reduced the numbers of holeand increased the wear resistance and the corrosion resistance of ceramic coating.In conclusion, the quality of the ceramic coating prepared by means of the plasma sprayed weld method was related to many factors , including coating design ,spraying equipment, spraying technics parameter, the propertiers of ceramic powder and bonding mechanism between the ceramic coating and the metal substrate.更多还原