1Cr17Ni4不锈钢金属和陶瓷等离子体喷涂工艺研究

1Cr17Ni4马氏体型不锈钢用作传动轴时耐磨损性能有待改善.采用等离子体喷涂方法在1Cr17Ni4马氏体型不锈钢表面制备Al2O3-TiO2 、Cr2O3陶瓷涂层和NiCrAlY金属涂层及NiCrAlY/ Al2O3-TiO2、NiCrAlY/ Cr2O3复合涂层,研究了它们的组织结构和磨损特性,讨论了喷涂工艺与耐磨损性能的关系.结果表明, Cr2O3涂层组织致密度高,与基体结合强度高,其耐磨性能好.提高喷涂功率时,Al2O3-TiO2、Cr2O3涂层致密度及与基体结合强度提高,其耐磨性能提高.合金涂层NiCrAlY的熔化状况和平化效果较陶瓷涂层优良,陶瓷涂层只有在较高喷涂功率时才有较好熔化和平化效果,而合金涂层在较低喷涂功率时,就可以得到较好的熔化和平化效果.陶瓷涂层Al2O3-TiO2、Cr2O3在磨损过程中的去除机制为断裂机制,金属涂层NiCrAlY在磨损过程中的去除机制为塑性变形机制.

Study on Technology of Plasma-spraying Ceramic and Alloy Coatings on 1Cr17Ni4 Stainless Steel

The properies of wear resistance of 1Cr17Ni4 stainless steel used for transmission shaft should be improved. The Al2O3-TiO2, Cr2O3 ceramic coating , NiCrAlY alloy coating and Al2O3-TiO2/NiCrAlY, Cr2O3/NiCrAlY multilayer coating on 1Cr17Ni4 stainless steel were fabricated by plasma spraying. The microstructure and properties of these coatings and the relationship between the wear resistance and the technology of plasma-spraying were studied. The result indicated that the density of Cr2O3 coating and the bond strength between coating and substrate were high, so its properties of wear resistance were better than other coatings . The density of Al2O3-TiO2, Cr2O3 coating and the bond strength with substrate and its wear resistance increased with the plasma-praying power increasing. The melting status of NiCrAlY alloy coating was better than ceramic coating. The ceramic coating has more excellent melting status at higher spraying power, but the alloy coating could get it at lower spaying power. The removing of ceramic coating Al2O3-TiO2 , Cr2O3 in the abrasive process was mechanism of fracture, but for alloy coating NiCrAlY, it was mechanism of plastic deformation.