复合制备Ni基合金涂层的组织结构及性能演变特征

发布时间：2018-01-23 12:31

本文关键词： 感应重熔强制冷却 Ni涂层定向晶摩擦磨损　出处：《稀有金属材料与工程》2017年03期 　论文类型：期刊论文

【摘要】：采用超音速等离子喷涂技术在45#钢基体上制备Ni60合金涂层,对预制的涂层分别进行高频感应重熔和感应重熔+强制冷却处理。借助OM、SEM、XRD、显微硬度计和销盘式摩擦磨损试验机对3种涂层的组织结构、显微硬度分布及摩擦磨损性能进行分析,研究Ni60合金涂层组织结构及其性能的演变特征。结果表明:3种涂层组织结构差异较大,单纯感应重熔涂层使喷涂涂层组织结构细密化,感应重熔+强制冷却的涂层形成了外延型生长的定向晶结构。喷涂涂层硬度自内向外呈明显下降趋势,而后续处理的2种涂层均表现为自内向外略为增加趋势,导致喷涂涂层尽管有较高的平均硬度,但表层硬度低于其他2种涂层。3种涂层均有很好的耐磨性能,但后续处理使涂层的摩擦系数明显增大,耐磨性能显著增强,尤其附加强制冷却的涂层表现出更加优异的耐磨性能,其平均磨损率分别低于喷涂涂层约8.5倍和单纯感应重熔涂层约2倍。
[Abstract]:By supersonic plasma spraying on 45# steel substrate preparation of Ni60 alloy coating, coating on prefabricated respectively for high frequency induction remelting and induction remelting, forced cooling processing. With the help of OM, SEM, XRD, microhardness tester and pin on disc friction and wear on the structure of 3 kinds of coating test machine, friction and wear performance analysis the distribution of microhardness, changes of the structure of Ni60 alloy coating and its properties. The results showed that 3 kinds of coating structure differences, simple induction remelting coating sprayed coating as well as the organizational structure of the coating, forced cooling + induction remelting forming the directional crystal structure of epitaxial growth. The hardness of the coating is sprayed from the inside to the outside is obvious a downward trend, 2 kinds of coating and subsequent treatment showed a slightly increasing trend from the inside to the outside, although the average hardness of lead spray coating has high surface hardness, but lower than The other 2 kinds of wear resistance coating.3 coatings are very good, but the subsequent processing of the friction coefficient of the coating increases obviously and the wear resistance increased significantly, especially with forced cooling coatings exhibit more excellent wear resistance, the average wear rate were lower than those of sprayed coating is about 8.5 times and the simple induction remelting coating is about 2 times.

【作者单位】：兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室;兰州交通大学;
【基金】：国家自然科学基金资助项目(51165021) 国家国际科技合作项目(2013DFR50790) 省部共建有色金属先进加工与再利用国家重点实验室资助项目(兰州理工大学)(SKL1301) 兰州理工大学博士基金
【分类号】：TG174.4
【正文快照】： Ni60合金粉末由于熔点低、润湿性好、自身较强能够阻止裂纹扩展、晶界滑移、位错移动[3-5]。因此,的脱氧排渣等优点,而广泛应用于机械、矿山、石油、可以被当作耐磨骨架。化工、汽车、船体等行业耐磨耐蚀零部件表面保护涂在涂层设计研究中,如果仅依靠涂层自身组织结层的制备,

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