铸钢轧辊亚微米WC-15Co电火花沉积涂层的高温性能

发布时间：2018-01-21 05:51

本文关键词： WC-Co硬质合金电火花沉积高温耐磨性高温氧化性　出处：《中国有色金属学报》2016年10期 　论文类型：期刊论文

【摘要】：采用新型电火花沉积设备,把WC-15Co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等技术研究沉积层在500℃的高温耐磨性和800℃高温氧化100 h后的氧化膜形貌、组织结构和高温抗氧化性能。结果表明:沉积层厚度约为30μm。500℃高温条件下,沉积层的耐磨性比基体的耐磨性提高2.7倍,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10~30μm,氧化膜主要由FeFe_2O_4、W_(20)O_(58)和CFe_(2.5)物相组成,沉积层的抗氧化性能比基体的提高3.6倍。细小弥散分布的硬质相和致密的氧化膜极大提高沉积层的抗高温磨损性能和抗高温氧化性能。
[Abstract]:Using a new type electric spark deposition, the WC-15Co ceramic hard alloy material is deposited on the steel material, was prepared by electrospark deposition alloy coating with SEM, XRD and other techniques to study sedimentary layer in the high temperature of 500 DEG C and 800 DEG C high temperature oxidation resistance of 100 h after the oxide film morphology, structure and organization. The high temperature oxidation resistance show that the sediment thickness is about 30 m.500 C under the condition of high temperature, wear resistance of the matrix deposition layer of the deposited layer increased by 2.7 times, the main wear mechanism is adhesive wear, fatigue wear, oxidation wear and abrasive wear effect; 800 DEG C under the condition of high temperature, deposition layer after 100 h oxidation the film thickness is about 10~30 m, the film is mainly composed of FeFe_2O_4, W_ (20) O_ (58) and CFe_ (2.5) phase, 3.6 times higher than the body antioxidant properties of the deposited layers. The dispersed distribution of hard phase and dense oxide film electrode The high temperature wear resistance and high temperature oxidation resistance of the sedimentary layer are greatly improved.

【作者单位】：华北水利水电大学机械学院;
【基金】：国家自然科学基金资助项目(51301070)~~
【分类号】：TG174.445
【正文快照】： 金属表面电火花沉积(Electro-spark deposition)技术是一种低应力、低变形的表面微焊接技术,它的基本原理就是把电极材料(硬质合金如WC、Ti C等)作为工作电极(阳极),氩气中使之与被沉积的金属工件(阴极)之间产生火花放电,在10-5~10-6 s内电极与工件接触的部位达到8000~25000℃

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