基于正交试验的等离子喷涂NiAl和NiCrAl涂层工艺研究

Research on Plasma Spraying NiAl and NiCrAl Coatings Process Based on Orthogonal Experiment

基于正交试验研究了等离子喷涂NiAl和NiCrAl涂层过程中结合强度与等离子喷涂参数之间的响应关系,分析了涂层显微特征的影响因素并据此优化了工艺参数。结果表明,影响NiAl涂层结合强度的因素主次顺序为氢气流量、氩气流量、电流、喷涂距离,影响NiCrAl涂层结合强度的因素主次顺序为喷涂距离、氩气流量、电流、氢气流量,工艺优化能够显著改善NiAl和NiCrAl涂层的显微特征和性能。NiAl涂层的工艺范围为氩气流量110~120 SCFH,氢气流量20~25 SCFH,电流600~610 A,喷涂距离130~140 mm,结合强度均在30 MPa以上,最大值为33 MPa。NiCrAl涂层的工艺范围为氩气流量120~130 SCFH,氢气流量25~30 SCFH,电流610~620 A,喷涂距离130~140 mm,最大结合强度为43.6 MPa。

The response relationship between bonding strength and plasma spraying parameters in the process of plasma spraying NiAl and NiCrAl coatings was studied by the orthogonal experiment.The influencing factors of coating microstructure were analyzed,and the process parameters were optimized.The results showed the factors that affect the bonding strength of NiAl coating were hydrogen flow,argon flow,current,spraying distance.Meanwhile,the factors of the NiCrAl coating were spraying distance,argon flow,current,hydrogen flow.The microstructure and performance of NiAl and NiCrAl coatings can be significantly improved by process optimization.The optimized process range of NiAl coating was argon flow rate 110~120 SCFH,hydrogen flow 20~25 SCFH,current 600~610 A,and spraying distance 130~140 mm,the bonding strength was all above 30 MPa,and the maximum value was 33 MPa.At the same time,the optimized process range of NiCrAl coating was argon flow 120~130 SCFH,hydrogen flow 25~30 SCFH,current 610~620 A,and spraying distance 130~140 mm,the maximum bonding strength was 43.6 MPa.