摘要
采用真空热压烧结工艺,制备TiB_2/(W,Ti)C/Ag(TWA)双润滑机制耦合从低温到高温均具有润滑性能的陶瓷刀具材料。X射线衍射(XRD)分析表明烧结过程中各组分化学相容性较好,断口形貌扫描电子显微镜(SEM)照片显示润滑剂Ag不仅能有效填充晶粒间隙,还能增强晶粒间黏结强度。以TiB_2/(W,Ti)C(TW)作为对比进行摩擦磨损实验,结果表明:室温下磨损表面均出现轻微机械犁沟,随着温度升高,TWA磨损表面形成富含润滑剂Ag的润滑膜,能有效减少摩擦系数与磨损量,400℃时其磨损量仅为TW磨损量的一半,TW、TWA主要磨损机制分别为磨粒磨损和黏结磨损。TiB_2在700℃原位生成的反应膜能提高复合材料减磨与耐磨性能,TW、TWA磨损机制主要为轻微磨粒磨损和氧化磨损。
TiB2/（W, Ti）C/Ag（TWA） coupling mechanisms ceramic tool material possessing the lubricity from room temperature to 700℃ was prepared by the hot pressing sintering. X-ray diffraction patterns showed that the composites with wide chemical compatibility in sintering possess. It can be seen from scanning electron microscope （SEM） photographs of fracture surfaces that lubricant Ag can not only fill into the gap between （W,Ti）C（TW） and TiB2 grains, but also enhance the bonding strength. Friction and wear testing results indicated that mechanical furrows exist in TWA and TW worn surface at room temperature. With increasing temperature, the lubricant Ag was smeared on TWA worn surface and they exhibit lower friction coefficient, only a half of that of the TW ceramic. Abrasive wear and adhesive wear are found dominant in both TW and TWA. The properties of antifriction and wear resistance can be improved by in-situ generated reaction film of TiB2 at 700℃, mild abrasive wear and tribo-oxidation are the dominant wear mechanisms in TW and TWA.
作者
曾国章
周后明
赵振宇
罗文懿
刘新乾
ZENG Guozhang ZHOU Houming ZHAO Zhenyu LUO Wenyi LIU Xinqian(School Of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China ShenZhen Institute of Information Technology, Shenzhen 518029, China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2017年第5期775-779,825,共6页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(51375418
51375419
51275436)
湖南省高校创新平台开放基金资助项目(13K040)
深圳市科技计划资助项目(JCYJ20160415114050831)
关键词
热压烧结
陶瓷刀具
耦合润滑
摩擦磨损
hot pressing sintering
ceramic tools
coupling lubrication
friction and wear
