Microstructures and tribological properties of plasma sprayed WC–Co–Cu–BaF2/CaF2 self-lubricating wear resistant coatings
Microstructures and tribological properties of plasma sprayed WC–Co–Cu–BaF2/CaF2 self-lubricating wear resistant coatings
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DOI：
10.1016/j.apsusc.2010.03.006
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发表时间：
2010-06
影响因子：
6.7
通讯作者：
Jianhui Yuan;Yingchun Zhu;H. Ji;Xuebin Zheng;Qichao Ruan;Y. Niu;Ziwei Liu;Yi Zeng
中科院分区：
文献类型：
--
作者：
Jianhui Yuan;Yingchun Zhu;H. Ji;Xuebin Zheng;Qichao Ruan;Y. Niu;Ziwei Liu;Yi Zeng
以自制的WC-Co、Cu和BaF 2/CaF 2共晶粉末为原料，采用常压等离子喷涂（APS）工艺制备了WC-Co-Cu-BaF 2/CaF 2自润滑耐磨涂层。与WC-Co涂层相比，所制备的金属陶瓷涂层具有更好的摩擦性能。此外，由于Cu与BaF 2/CaF 2相的结合，WC在APS过程中易发生脱碳现象，不仅起到了有效的固体润滑作用，而且还起到了粘结相的作用，改善了WC的组织，防止了WC的分解。优化后的试样含10 wt.% Cu和10 wt.% BaF 2/CaF 2复合材料具有优异的摩擦磨损性能。通过对复合材料的显微组织、成分和力学性能的分析，探讨了自润滑耐磨涂层的磨损机理。
A promising WC–Co–Cu–BaF2/CaF2self-lubricating wear resistant coating was deposited via atmospheric plasma spraying (APS) process by using homemade feedstock powders composed of WC–Co, Cu and BaF2/CaF2eutectic. The as-prepared cermet coatings had better frictional behavior comparing with the WC–Co coating. Moreover, the often-occurred decarburization of WC in APS process was noticeably improved due to the binding of copper and BaF2/CaF2phase, which not only offered effective solid lubrication, but also acted as bind phases to mend the microstructure and protected WC from decomposition. The optimized specimen contained 10wt.% Cu and 10wt.% BaF2/CaF2in a WC–Co matrix, which had excellent frictional and wear performance. The wear mechanism of the self-lubricating wear resistant coating was discussed with the microstructures, compositions and mechanical properties of the composite materials in detail.