采用新型电火花沉积设备,把WC-8Co陶瓷硬质合金材料沉积在铸钢材料上,制备了电火花沉积合金涂层,用SEM、XRD等技术研究了沉积层在500℃的高温耐磨性和800℃高温氧化100 h后氧化膜形貌图、组织结构和高温抗氧化性能.结果表明:沉积层厚度为20～ 30 μm.500℃高温条件下沉积层的耐磨性比基体提高了3.3倍,500℃高温条件下沉积层的磨损机理主要是粘着磨损、疲劳磨损、氧化磨损和磨粒磨损的综合作用.800℃高温条件下沉积层氧化100 h后的氧化膜的厚度约为10 μm;氧化膜主要由FeFe2O4、Fe2O3、Fe5C2和Fe2W物相组成;800℃高温下沉积层抗氧化性能比基体的抗氧化性能提高了4.8倍.细小弥散分布的硬质相和致密的氧化膜极大提高了沉积层的抗高温磨损性能和抗高温氧化性能.
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