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无机材料学报

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2017 , Vol. 32 >Issue 8: 813 - 818

DOI: https://doi.org/10.15541/jim20160590

抑制剂对WC-Co硬质合金涂层性能的影响

  • 王学政 ,
  • 王海滨 ,
  • 刘雪梅 ,
  • 杨涛 ,
  • 宋晓艳
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  • (北京工业大学 材料科学与工程学院, 新型功能材料教育部重点实验室, 北京100124)
王学政(1972–), 男, 博士研究生. E-mail: w2003-2008@163.com

收稿日期: 2016-10-28

  修回日期: 2016-11-25

  网络出版日期: 2017-07-19

基金资助

国家“863”计划主题项目 (2013AA032001);北京市自然科学基金重点项目(2131001);北京市自然科学基金(2154045)

收起

Grain Growth Inhibitor on the WC-Co Cemented Carbide Coating

  • Xue-Zheng WANG ,
  • Hai-Bin WANG ,
  • Xue-Mei LIU ,
  • Tao YANG ,
  • Xiao-Yan SONG
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  • (College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, China)
WANG Xue-Zheng. E-mail: w2003-2008@163.com

Received date: 2016-10-28

  Revised date: 2016-11-25

  Online published: 2017-07-19

Supported by

863 Prograns (2013AA032001);Natural Science Foundation of Beijing (2131001, 2154045)

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摘要

利用原位还原碳化反应合成的超细WC-12Co复合粉末作为原料, 分别添加1.0wt%晶粒长大抑制剂即VC、Cr3C2和NbC, 经团聚造粒和超音速火焰(HVOF)喷涂制备了超细结构的硬质合金涂层。研究了不同晶粒长大抑制剂对涂层的显微组织结构、物相、硬度、耐磨性能和耐蚀性能的影响。结果表明, 与未添加晶粒长大抑制剂涂层相比, 添加1.0wt% VC或Cr3C2制备的硬质合金涂层中WC颗粒的平均尺寸降低了约49%, 涂层硬度明显提高, 磨损速率降低了约52%~55%。添加1.0wt% NbC对制备涂层中WC颗粒尺寸的抑制作用不明显, Co粘结相中由于形成了(W, Nb)C化合物, 其耐蚀性获得显著提高, 但该化合物脆性大, 导致涂层耐磨性不及添加VC和Cr3C2制备的涂层。

关键词： 晶粒长大抑制剂; 超细WC-Co复合粉; 硬质合金涂层; 耐磨性; 耐蚀性

本文引用格式

王学政 , 王海滨 , 刘雪梅 , 杨涛 , 宋晓艳 . 抑制剂对WC-Co硬质合金涂层性能的影响[J]. 无机材料学报, 2017 , 32(8) : 813 -818 . DOI: 10.15541/jim20160590

Abstract

The ultrafine WC-12Co composite powder was synthesized by in situ reduction and carbonization reactions. Using the composite powder with an addition of 1.0wt% grain growth inhibitor (GGI) i.e. VC, Cr3C2 and NbC, as raw materials, the ultrafine-structured cemented carbide coatings were fabricated by the high velocity oxy-fuel (HVOF) spraying method. Prior to thermal spraying, the powders were agglomerated into thermal spray feedstock. The effects of GGI addition on phase constitution, microstructure, hardness, and wear and corrosion properties of the coatings were investigated. The results show that the mean WC particle size of coatings with an addition of 1.0wt% VC or Cr3C2 decreases by about 49% as compared to that without GGI. Moreover, hardness of the coatings is significantly improved and the wear rate decreases by 52%-55%. Addition of 1.0wt% NbC has little effect on WC particle size of the coating but leads to formation of (W, Nb)C compound in the Co binder. Thus the corrosion resistance of the coating containing NbC is significantly enhanced. However, its wear resistance is lower than those with VC or Cr3C2, due to high brittleness of the (W, Nb)C compound.

Key words： grain growth inhibitor; ultrafine WC-Co composite powder; cemented carbide coating; wear resistance; corrosion resistance

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