等离子与电弧喷涂Ni-Cr-Al涂层结合强度和磨粒磨损性能

Bond strength and wear performance of plasma sprayed and arc sprayed

采用等离子和电弧两种方法制备厚度不同的Ni-Cr-Al涂层,对比涂层在不同喷涂工艺下的组织结构、结合强度、涂层挠度和耐磨性能,并研究涂层结合强度和挠度随涂层厚度变化的规律。结果表明:涂层组织均呈现出典型的层状结构特征,界面结合良好。结合强度和挠度均随着厚度的增加而降低,当厚度>0.5 mm时,等离子涂层的结合强度和挠度随厚度下降的幅度要大于电弧喷涂涂层,其中等离子涂层最大厚度为1.3 mm时结合强度为21.57 MPa,挠度为10.9×10-3in(l in=25.4 mm),而电弧喷涂涂层厚度为2.2 mm时的结合强度为22.79 MPa,挠度10.3×10-3in,涂层的绝对磨损量随着磨损时间的增加而升高,但相对磨损量则降低,涂层的磨损量随着磨损试验载荷的增大而增大。

Morphology,bond strength,residual stress and wear resistance of plasma sprayed and arc sprayed Ni-Cr-Al coatings were investigated by means of SEM,fensile test,Almen method and wearing tests.The relationships between the coating thickness and bonding strength and deflection of the Alwen strips were examined.Both coatings exhibit typical characteristic layered structure with good bonding interface.The bond strength and deflection of the coated samples decrease with the increase of coating thickness.When the thickness of coating is greater than 0.5 mm,the decline range of bonding strength and deflection of plasma-sprayed coating is higher than that of arc-sprayed coating with the increase of thickness.The bonding strength of plasma-sprayed coating is 21.57 MPa and deflection is 10.9 × 10-3 in（l in=25.4 mm） with the max thickness of 1.3 mm.For the arc-sprayed coating,the bonding strength is 22.79 MPa and deflection is 10.9 × 10-3 in when the coating thickness is 2.2 mm.Weight loss increases with the increasing of wearing time and load while the relative weight loss decreases when the wearing time increases.