铸铁等离子喷焊Stellite6钴基合金涂层的组织与性能

以Steilite6钴基合金粉末为原料，采用等离子喷焊技术，选择合适的工艺参数，在HT250基体上制备具有冶金结合的耐磨、耐热合金涂层．借助于OM、SEM、XRD观察分析涂层的组织，利用显微硬度计测试涂层的显微硬度分布，在磨损试验机上通过环一块磨损试验评估涂层的耐磨性能．结果表明：等离子喷焊涂层组织均匀细小，主要由γ-Co、（Cr，Fe），C2相组成；涂层的显微硬度可达590～680HV。；在室温干滑动磨损条件下，基体试样的失重量约为涂层的5．5倍，表明涂层的耐滑动磨损性能明显提高．

Microstructure and Performance of Stellite 6 Co-based Alloy Coating Prepared by Plasma Spray Welding on HT250 Cast Iron

By plasma spray welding technology with the appropriate processing parameter, a wear-resistant coating was prepared on HT250 Cast iron with Stellite6 cobalt-based alloy powder. The microstructure of the spray coating was investigated by OM,SEM and XRD. The microhardness of the coating was tested by microhardness tester. The wear resistance performance of the coating was evaluated on a MM-200 block-on-wheel sliding wear tester. The results show that the coating has a microstructure consisting of γ-Co solid solution and （Cr,Fe）TCs compound,its microhardness varies from 590-680 HV0.5. The loss-weight of the HT250 substrate is about 5.5 times higher than that of coating under dry sliding wear test conditions. The wear resistance of the coating is enhanced greatly.