抑制剂对WC-Co硬质合金涂层性能的影响

发布时间：2018-01-30 13:42

本文关键词： 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　出处：《无机材料学报》2017年08期 　论文类型：期刊论文

【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Nb C,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Cr_3C_2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%Nb C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。
[Abstract]:The superfine WC-12Co composite powder synthesized by in-situ reduction and carbonation reaction was used as raw material, and 1.0 wt% grain growth inhibitor, VCnCr3C2 and NB C, were added respectively. Ultrafine cemented carbide coatings were prepared by agglomeration and HVOF spraying. The microstructure, phase and hardness of the coatings with different grain growth inhibitors were studied. The effect of wear resistance and corrosion resistance. The results show that compared with the coating without grain growth inhibitor. The average size of WC particles in the cemented carbide coating prepared by adding 1.0 wtVC or Cr_3C_2 decreased by about 49 and the hardness of the coating increased obviously. The wear rate is reduced by about 52% and 55%. The inhibition of WC particle size in the coating by adding 1.0 wtNbC is not obvious because of the formation of W / W in the Co bonded phase. The corrosion resistance of Nb)C compound was significantly improved, but the brittleness of the coating was higher than that of the coating prepared by adding VC and Cr3C2, and the wear resistance of the coating was lower than that of the coating prepared by adding VC and Cr3C2.
【作者单位】：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;
【基金】：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)~~
【分类号】：TG174.4
【正文快照】： 863 Prograns(2013AA032001);Natural Science Foundation of Beijing(2131001,2154045)WC-Co类涂层具有较高的硬度和优良的耐磨性,在航空航天、汽车、船舶、石油化工、机械制造、电力、印刷等领域得到广泛应用[1-4]。研究发现[5-9],超细/纳米粉末具有特殊的小尺寸效应和表面

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