大气等离子喷涂工艺参数对Al2O3涂层性能的影响

为了提高燃烧器工艺烧嘴的使用寿命,在UMCo-50基材表面大气等离子喷涂Al2O3层。采用正交试验法对喷涂工艺参数进行了优化,运用微观形貌分析、X射线衍射分析并结合强度及显微硬度等测试方法,系统研究了喷涂主气流量、功率和送粉量对AI2O3涂层综合性能的影响规律。结果表明:喷涂主气流量、功率和送粉量对Al2O3涂层性能具有交互性影响,在40L/min Ar,48 kW和30g/min条件下可以获得性能较好的Al2O3涂层,极大地提高了UMCo-50基材的抗高温氧化和耐磨性能,使之具有广阔的应用前景。

Effect of Process Parameters on Properties of Atmospheric Plasma Sprayed Al2O3 Coating

The work aims to optimize atmospheric plasma spraying process parameters of Al2O3 oxide ceramic coatings for the combustion burner (material: UMCo-50). Based on the orthogonal experimental design of the process parameters, the effects of main gas flow, power and powder feeding rate on the properties of atmospheric plasma sprayed Al2O3 coatings were systematically studied. The microstructure of powder and coatings was studied by X-ray diffractometer and scanning electron microscope. The bonding strength and cross section hardness of the coatings were measured by tensile machine and Vickers hardness tester. The optimized spraying process parameters were obtained. Results showed that the flow rate of main gas, power and powder feeding rate had the interactive influences on the properties. Under the condition of 40 L/min Ar, 48 kW and 30 g/min, the coating with better performance was obtained. Furthermore, the coating greatly improved the high temperature oxidation resistance and the wear resistance of the substrate materials (UMCo-50), which presented the wide application prospect. words: