灰铸铁表面碳化钨层的制备与耐磨性能

机械工程材料, 2016, 40(2): 16-20. doi: 10.11973/jxgccl201602004

灰铸铁表面碳化钨层的制备与耐磨性能

1.西安建筑科技大学机电工程学院,西安,710055

2.西北工业大学材料学院,西安,710068

3.西安建筑科技大学机电工程学院,西安,710055

4.西安建筑科技大学机电工程学院,西安,710055

基金项目: 陕西省科学技术研究发展计划项目工业攻关计划(2014K08-13) 国家科技计划项目对俄科技合作专项(2014DFR50630) 中国博士后科学基金资助项目(2014M552488) 国家高技术研究发展计划(“863”计划)项目(2013AA031803) 国家自然科学基金资助项目(51374169)

关键词：碳化钨层 , 显微组织 , 磨损 , 铸渗

Preparation and Wear Resistance of Tungsten Carbide Layer at Gray Cast Iron Surface

Keywords： tungsten carbide layer , microstructure , wear , cast infiltration

利用铸渗结合热处理工艺,在 HT300灰铸铁表面原位制备了碳化钨(WC)层,利用扫描电子显微镜、X 射线衍射仪和销盘磨料磨损试验机研究了 WC 层的显微组织和耐磨性能,分析了其磨损机理。结果表明：灰铸铁表面形成了厚度约为112μm 的 WC 层；WC 层的相对耐磨性随载荷的增大先增加后减小,载荷为15 N 时,WC 层的耐磨性明显高于灰铸铁的；大载荷下 WC 层的磨损失效形式主要表现为颗粒挤压破碎并有部分剥落,同时,有片状的磨屑产生。

Tungsten carbide (WC)layer was in-situ synthesized at the surface of HT300 gray cast iron by combination of casting-infiltration and heat treatment process.The microstructures and wear resistance of the WC layers were studied by scanning electron microscopy,X-ray diffraction and pin disk abrasive wear test.The wear mechanism was also analyzed.The results show that the WC layer with thickness of 1 12 μm was formed on the surface of the gray cast iron.The relative wear resistance of the WC layer first increased then decreased with the increase of loads.When the load was 1 5 N,the relative wear resistance of the WC layer was better than that of the gray cast iron.Under the heavy load,the wear-out failure of the WC layer mainly ascribed to particles′ squeezing fracture and partial peeling,meanwhile sheet-like wear debris was generated.

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