超音速电弧喷射成形工艺参数对AgNiCu15-5沉积坯致密性的影响

摘要

The orthogonal design approach was used to investigate the effects of technical parameters of ultrasonic arc spray formation ( UASF ) on the density of AgNiCu15_5 deposited billets. The morphology of the deposited billets was studied by SEM. The experimental results show that, under the condition of 250 mm spray length, both the arc voltage(U) and the pressure of atomization gases(P) have great effects on the density of deposited billet, whereas the arc current (I) and the substrate rotation speed ( Z) have no marked effects. The optimal process parameters of preparing the AgNiCu15-5 deposited billet are given as follows; the arc voltage is 32 V, the pressure of atomization gases is 0. 9 MPa, the arc current is 220 A, the substrate rotation speed is 800 r/min. SEM revealed that the microstructure of the deposited billets obtained under the optimal process parameters is compact.%采用正交设计方法和通过极差分析研究了超音速电弧喷射成形工艺参数对AgNiCu15-5沉积坯致密性的影响,同时采用SEM对沉积坯的组织形貌进行观察.研究结果表明,当沉积距离L为250 mm时,影响沉积坯致密性的工艺参数的主次顺序为:电弧电压U、雾化气压P、电弧电流I、沉积盘转速Z；综合分析表明,优化的沉积工艺参数为U2P2I3Z2,即U为32 V、P为0.9 MPa、I为220 A、Z为800 r/min.SEM分析表明,优化工艺参数制备的沉积坯内部组织致密,孔隙极少.