活塞环用Mo-(NiCr-Cr_3C_2)复合涂层的优化研究

Optimization of Mo-(NiCr-Cr_3C_2)Composite Coating for Piston Ring Application

采用机械混合方法配制喷涂用粉末Mo-(NiCr-Cr3C2),并利用大气等离子喷涂方法制备活塞环耐磨涂层,对涂层进行力学性能以及摩擦学性能测试。结果表明,Mo的添加有助于减小涂层的孔隙率,涂层显微硬度随Mo含量的增加而降低,添加20%(质量分数)Mo的复合涂层具有较好的摩擦磨损性能。复合涂层的磨损主要表现为黏着磨损和磨粒磨损,NiCr-Cr3C2含量高的涂层存在较多的剥落现象。涂层的耐磨性与涂层的硬度模量比(H/E)有较好的对应关系。

The composite powder of Mo-（NiCr-CraC~） was mechanically blended and deposited using atmospheric plasma spraying. The mechanical property and tribological performance of the prepared coating were tested. The results show that the porosity and the microhardness of the composite coat- ing are inversely proportional to the Mo content. The coating with the Mo addition of 20% （mass frac- tion） presents better performance in the frictional test. All the composite coatings mainly endures adhesive wear and abrasive wear. The coating containing large portion of NiCr-Cr3C2 is prone to flake during the wear. The wear resistance of the coating shows a good accordance with the index of H/E of the coating.