等离子喷涂工艺参数对FeCrBSi合金涂层结合强度的影响

采用等离子喷涂工艺在Q235钢基体上直接制备了FeCrBSi合金涂层，使用正交试验法研究了喷涂工艺参数对涂层结合强度的影响，并对喷涂工艺参数进行了优化，同时在优化参数的基础上进一步研究了涂层厚度对结合强度的影响。结果表明：等离子喷涂制备FeCrBSi合金涂层的最佳工艺参数为喷涂电流900A，主气流量44．8L·min-1，辅气流量27．8L·min-1，喷涂距离110mm；采用最佳工艺制备的涂层与基体的结合强度为18．2MPa，内聚强度为33．5MPa；随着涂层厚度的增加，涂层与基体的结合强度明显下降，而涂层的内聚强度先上升后下降，较佳的涂层厚度为347．2μm。

Effect of Plasma Spraying Process Parameters on the Bonding Strength of FeCrBSi Alloyed Coatings

FeCrBSi alloyed coatings was prepared on Q235 steel substrate directly by plasma spraying process. The effect of plasma spraying process parameters on the bonding strength of the coatings was studied by orthogonal test method, and the process parameters were optimized at the same time. Then the effect of coating thickness on the bonding property of the coatings was also studied on the basis of optimized parameters. The results show that the best process parameters for plasma spraying FeCrBSi alloyed coatings were spraying electric current of 900 A, main gas flow of 44. 8 L · min-1 , assist gas flow of 27. 8 L · min-1 and spraying distance of 110 rnm. Bonding strength between the substrate and the coating, and inside the coating of the sample sprayed by optimized parameters was 18. 2 MPa and 33. 5 MPa separately. With the increase of coating thickness, bonding strength between the substrate and the coating decreased obviously, but the bonding strength inside the coating first increased and then decreased. The optimized coating thickness was 347. 2μm.