电火花沉积Ni-Cr合金涂层的组织及性能

利用电火花沉积技术,采用自制电极在P20钢基材表面沉积Ni-Cr合金涂层,研究了沉积层的组织特征、显微硬度分布及耐磨、耐蚀性能。结果表明：通过优化沉积工艺参数可以获得厚度高达430μm的沉积层。电火花沉积层与基体的结合界面属于非均匀混合互熔结晶型界面,沉积层与基体呈现良好的冶金结合;涂层中下部组织为细小的枝晶组织,而上部组织为纳米晶结构。沉积层的硬度呈梯度分布,涂层外层硬度值最高。涂层的耐磨、耐蚀性能比基体有较大提高,涂层上部超细的纳米晶结构是其耐磨性能及耐蚀性能提高的主要因素。...

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Bibliographic Details
Published in材料工程 no. 3; pp. 74 - 78
Main Author 高玉新 赵程 易剑
Format Journal Article
LanguageChinese
Published 台州学院机械工程学院,浙江台州318000%青岛科技大学表面工程研究所,山东青岛,266061%台州学院机械工程学院,浙江台州318000 2012
青岛科技大学表面工程研究所,山东青岛266061
清华大学新型陶瓷与精细工艺国家重点实验室,北京100084
Subjects
Ni-Cr合金涂层
微观组织
性能
电火花沉积
电火花沉积
性能
微观组织
Ni-Cr合金涂层
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ISSN1001-4381
1001-4381
DOI10.3969/j.issn.1001-4381.2012.03.016

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Summary:利用电火花沉积技术,采用自制电极在P20钢基材表面沉积Ni-Cr合金涂层,研究了沉积层的组织特征、显微硬度分布及耐磨、耐蚀性能。结果表明：通过优化沉积工艺参数可以获得厚度高达430μm的沉积层。电火花沉积层与基体的结合界面属于非均匀混合互熔结晶型界面,沉积层与基体呈现良好的冶金结合;涂层中下部组织为细小的枝晶组织,而上部组织为纳米晶结构。沉积层的硬度呈梯度分布,涂层外层硬度值最高。涂层的耐磨、耐蚀性能比基体有较大提高,涂层上部超细的纳米晶结构是其耐磨性能及耐蚀性能提高的主要因素。
Bibliography:ESD; Ni-Cr coating; microstructure; property
11-1800/TB
GAO Yu-xin,ZHAO Cheng,YI Jian,（1 Surface Engineering Laboratory,Qingdao University of Science and Technology, Qingdao 266061,Shandong,China;2 College of Mechanical Engineering,Taizhou University,Taizhou 318000,Zhejiang,China;3 State Key Laboratory of New Ceramics and Fine Processing,Tsinghua University,Beijing 100084,China）
The Ni-Cr alloyed coating was produced on the surface of P20 steel plate with self-made electrode by electro-spark deposition（ESD） technique.The microstructures and properties of the coating were investigated.The results show that ESD process can produce big-thickness coating with proper process parameters,and the thickness is about 430μm.The coating is well bonded to the matrix and the interface between the coating and the substrate is presented as non-uniformly mixed mutuai melting crystallization.The superfine dendritic structure prevails in the middle and bottom of the coating and nano-structured grains in the upper coating.The hardn
ISSN:1001-4381
1001-4381
DOI:10.3969/j.issn.1001-4381.2012.03.016