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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20~30μm。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10μm;氧化膜主要由FeFe_2O_4、Fe_2O_3、Fe_5C_2和Fe_2W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。
A new type of EDM deposition equipment was used to deposit WC-8Co cemented carbide material on the cast steel. The coating of EDM was prepared. The wear resistance of the deposited layer at 500 ℃ was studied by SEM, XRD and other techniques. And high temperature oxidation at 800 ℃ for 100 h, the morphology, structure and oxidation resistance of the oxide film were investigated. The results show that the thickness of sedimentary layer is 20 ~ 30μm. Under 500 ℃ high temperature, the wear resistance of the deposited layer is 3.3 times higher than that of the matrix. The wear mechanism of the deposited layer under the high temperature of 500 ℃ is mainly the combination of adhesive wear, fatigue wear, oxidative wear and abrasive wear. The thickness of the oxide film is about 10μm when the deposited layer is oxidized for 100 h at 800 ℃. The oxide film mainly consists of FeFe 2 O 4, Fe 2 O 3, Fe 5 C 2 and Fe 2 W. The oxidation resistance of the deposited layer is higher than that of the matrix at 800 ℃ Increased by 4.8 times. Fine and dispersed hard phase and dense oxide film greatly improve the high temperature wear resistance of the deposited layer and high temperature oxidation resistance.