<strong>H13</strong>钢表面电火花沉积<strong>WC-Ni</strong>基金属陶瓷涂层微观组织及摩擦磨损性能

doi:10.11900/0412.1961.2020.00360

金属学报

2021, Vol. 57

Issue (8): 1048-1056 DOI: 10.11900/0412.1961.2020.00360

研究论文

本期目录 | 过刊浏览

H13钢表面电火花沉积WC-Ni基金属陶瓷涂层微观组织及摩擦磨损性能

王文权, 杜明, 张新戈(

), 耿铭章

吉林大学材料科学与工程学院汽车材料教育部重点实验室长春 130022

Microstructure and Tribological Properties of WC-Ni Matrix Cermet Coatings Prepared by Electrospark Deposition on H13 Steel Substrate

WANG Wenquan, DU Ming, ZHANG Xinge(

), GENG Mingzhang

Key Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130022, China

引用本文:

王文权, 杜明, 张新戈, 耿铭章. H13钢表面电火花沉积WC-Ni基金属陶瓷涂层微观组织及摩擦磨损性能[J]. 金属学报, 2021, 57(8): 1048-1056.
Wenquan WANG, Ming DU, Xinge ZHANG, Mingzhang GENG. Microstructure and Tribological Properties of WC-Ni Matrix Cermet Coatings Prepared by Electrospark Deposition on H13 Steel Substrate[J]. Acta Metall Sin, 2021, 57(8): 1048-1056.

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摘要:

为了提高H13钢表面性能，延长其使用寿命，采用电火花沉积工艺在H13钢基体上制备了WC-Ni基金属陶瓷涂层，并分别以Ni和Mo作为过渡层制备了复合涂层。利用XRD、SEM、EDS、显微硬度计和摩擦磨损试验机分析了涂层的物相、微观组织、显微硬度和摩擦磨损性能。结果表明，WC-Ni涂层表面由溅射状沉积斑点堆积而成，横截面分为涂层区、过渡层和基体3个区域，WC硬质相弥散分布于涂层内。Ni/WC-Ni复合涂层的表面较为光滑平整，Ni过渡层的引入并未改变涂层的物相，界面处WC硬质相异常长大。Mo/WC-Ni复合涂层表面存在微细裂纹，且生成了新相Fe_9.7Mo_0.3。复合涂层的硬度均高于WC-Ni涂层，复合涂层的摩擦系数和磨损失重均低于基体与WC-Ni涂层，Mo/WC-Ni复合涂层具有更好的耐磨性。

关键词 ：电火花沉积, WC-Ni基金属陶瓷涂层, 复合涂层, 组织结构, 摩擦磨损性能

Abstract：

H13 steel is one of the most promising materials for molds owing to its outstanding hardenability, high toughness, and thermal cracking resistance. To reinforce the surface performance and extend service life of H13 steel, a WC-Ni matrix cermet composite coating with a Ni or Mo transition layer was prepared by electrospark deposition on an H13 steel substrate. The phase compositions, microstructure, microhardness, and tribological properties of the coating were investigated in detail. The surface of the WC-Ni coating contained accumulated sputtered deposition spots. The cross section of WC-Ni coating is composed of a coating, a transition layer, and a substrate with a clear boundary; the WC hard phases are dispersed in the coating. The Ni/WC-Ni composite coating surface is relatively smooth and flat, and its phase composition is consistent with that of the WC-Ni coating. The WC hard phases show abnormal growth at the interface. The surface of a Mo/WC-Ni composite coating exhibits microcracks and indicates the formation of a new Fe_9.7Mo_0.3 phase. Hardness values of the composite coatings are greater than that of the WC-Ni coating, and their friction coefficient and wear loss are lower than that of the H13 steel substrate and WC-Ni coating. In addition, the antiabrasive performance of the Mo/WC-Ni composite coating is better than that of the Ni/WC-Ni composite coating.

Key words： electrospark deposition WC-Ni matrix cermet coating composite coating microstructure tribological property

收稿日期: 2020-09-09

ZTFLH:

TG174.44

基金资助:中央高校基本科研业务费项目(45120031B004);吉林省省校共建项目(440050316A14)

作者简介: 王文权，男，1971年生，教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00360 或 https://www.ams.org.cn/CN/Y2021/V57/I8/1048

图1 电火花沉积过程示意图

图2 电火花沉积WC-Ni基金属陶瓷涂层、Mo/WC-Ni复合涂层和Ni/WC-Ni复合涂层的XRD谱

图3 电火花沉积WC-Ni基金属陶瓷涂层、Mo/WC-Ni复合涂层和Ni/WC-Ni复合涂层表面形貌的SEM像

图4 电火花沉积WC-Ni基金属陶瓷涂层的截面形貌、EDS扫描分析和WC颗粒尺寸分布图

图5 电火花沉积Ni/WC-Ni复合涂层与Mo/WC-Ni复合涂层截面形貌的SEM像及EDS线扫描分析

图6 电火花沉积WC-Ni基金属陶瓷涂层、Mo/WC-Ni复合涂层和Ni/WC-Ni复合涂层的显微硬度分布

图7 室温下摩擦载荷为5和8 N时H13钢基体、WC-Ni金属陶瓷涂层、Mo/WC-Ni复合涂层和Ni/WC-Ni复合涂层摩擦系数曲线

图8 摩擦载荷为5和8 N时H13钢基体、WC-Ni金属陶瓷涂层、Mo/WC-Ni复合涂层和Ni/WC-Ni复合涂层的磨损失重

图9 H13钢基体、WC-Ni金属陶瓷涂层、Mo/WC-Ni复合涂层和Ni/WC-Ni复合涂层的磨损形貌

表1 图9中方框区域的EDS分析结果 (mass fraction / %)

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