超音速等离子喷涂工艺参数对AlSi-20%Al/Ni涂层结合强度的影响

Influence of Supersonic Plasma Spraying Process on Bonding Strength of AlSi-20%Al/Ni Coating

为使AlSi-20%Al/Ni超音速等离子喷涂涂层获得优良的结合性能,采用正交实验法研究了喷涂距离、喷涂电压、喷涂电流等喷涂工艺参数对结合强度的影响。利用X射线衍射、扫描电镜等手段对涂层的相组成和断口形貌进行分析,利用WDW-E100D微机控制式万能拉伸试验机对涂层结合强度进行测试。结果表明:涂层由AlSi和AlNi两相组成,影响AlSi-20%Al/Ni涂层结合强度工艺参数的主次顺序为喷涂距离、喷涂电压、喷涂电流,优化后的工艺参数为主气流量3.2m3/h,喷涂电流为380A,喷涂电压为130V,喷涂距离为90mm,在此参数下制备的涂层组织致密,其结合强度为65.5MPa。

In order to get a supersonic plasma sprayed A1Si-20%A1/Ni coating with good properties, the effect of supersonic plasma spraying process parameters on the bonding strength of the coatings was investiga- ted by orthogonal experiment. The fracture of the coating and morphology of the sprayed layer were investiga- ted by X-ray diffraction（XRD） and scanning electron microscopy（SEM）, and the bonding strength of the coatings was tested by WDW-E100D. The result shows that the coating is composed by AISi and A1Ni, the primary and secondary gradation of process parameters which are effect on the bonding strength of the coating are spraying distance, spraying voltage and spraying electric current. The optimized process parameters of the supersonic plasma spraying A1Si-20% A1/Ni coating is primary gas flux 3. 2 m3/h, spray current 380 A, spray voltage 130 V and spray distance 90 ram. With the optimized process parameters, the coating is compact and the bonding strength of the coating reaches to 65.5 MPa.