代雪婷,南健,程庆元.金相磨抛工艺对碳化钨涂层组织评定的影响[J].热喷涂技术,2021,13(2):55~61.
金相磨抛工艺对碳化钨涂层组织评定的影响
Effect of Metallographic Grinding and Polishing Process onWC-10Co-4Cr Coating Microstructure Evaluation
  
DOI:10.3969/j.issn.1674-7127.2021.02.007
中文关键词:  超音速火焰喷涂  碳化钨涂层  金相制备
英文关键词:High velocity oxygen fuel spray  Tungsten carbide coating  Metallographic preparation
基金项目:
        
作者单位
代雪婷 国营芜湖机械厂
南健 国营芜湖机械厂
程庆元 国营芜湖机械厂
摘要点击次数: 72
全文下载次数: 73
中文摘要:
      碳化钨涂层内部为复合相组织, 硬度高脆性大, 金相制备易导致涂层内部出现裂纹、 分层、 拔出等缺陷。 本文利用超音速火焰喷涂制备 WC-10Co-4Cr 涂层, 采用不同的金相研磨和抛光工艺, 分别评定 WC-10Co-4Cr 涂 层的组织。 结果表明: 不同的金相研磨和抛光工艺对 WC-10Co-4Cr 涂层的孔隙率的评定结果有明显影响。 随着 磨抛压力的上升, 涂层内部孔隙的尺寸明显增大, 涂层原有孔隙周边被压裂、 脱落, 且脱落碳化钨颗粒进一步增 强了对涂层表面的磨削效果, 使得涂层表面的局部区域出现大范围脱落, 从而导致随着研磨压力的上升, 涂层的 孔隙率升高了 12.5% 至 30%, 随着抛光压力的上升, 涂层的孔隙率升高了近一倍。 因此, 为降低磨抛工艺对涂层 组织评定的影响, 建议使用 15N 的磨抛压力开展碳化钨涂层的金相制备, 以获得更加准确的金相评定结果。
英文摘要:
      The internal coatings oftungsten carbide is composite phases with high hardness and brittleness. Metallographic preparation process can easily lead to crack, delamination, pull-out and other defects in the coating. In this work, the WC-10Co-4Cr coating was deposited by high velocity oxygen fuel spray(HVOF). The microstructure of WC-10Co-4Cr coatings prepared different metallographic grinding and polishing processes has been evaluated. The results showed that the different metallographic grinding and polishing processes have obvious effect on the evaluation results of porosity of WC-10Co-4Cr coating. As the pressure of grinding and polishing increased, the size of pores inside the coatings enlarged obviously. The areas around the original pores of coating were fractured off. There was a large area of peeling off on the coating surface due to the further enhanced grinding effect of dropped tungsten carbide particles, which caused the porosity of coating ascend by 12.5% to 30%. Also,with the increase of polishing pressure, the porosity of the coating nearly doubled. Therefore, in order to reduce the effect of grinding and polishing processes on the microstructure evaluation of coating, it is suggested to use 15N grinding and polishing pressure to carry out the metallographic preparation of tungsten carbide coating, so as to obtain more accurate metallographic evaluation results.
查看全文  查看/发表评论  下载PDF阅读器
关闭