| 摘要: |
| 通过大气等离子喷涂方法，使用自制的含有WC-Co、Cu和BaF2/CaF2共晶体的复合喷涂粉末，制备出WC-Co-Cu-BaF2/CaF2自润滑耐磨涂层。在200 ℃、400 ℃和600 ℃下进行WC-Co-Cu-BaF2/CaF2涂层和WC-Co涂层的高温摩擦试验，用扫描电镜观察涂层磨损表面微观形貌。结果表明：200 ℃时，由于WC-Co-Cu-BaF2/CaF2涂层摩擦产物层中含有的WC硬质颗粒引起磨粒磨损，该涂层摩擦因数和磨损率相对较高。而400 ℃和600 ℃时，WC-Co-Cu-BaF2/CaF2涂层的摩擦产物层中均无WC颗粒存在，且由于涂层中Cu和BaF2/CaF2等固体润滑剂的作用，生成的摩擦产物层光滑且致密，涂层的摩擦因数和磨损率均较低，在400～600 ℃下表现出比WC-Co涂层优异的耐磨性能。 |
| 关键词: 等离子喷涂 自润滑 高温摩擦 磨损机理 |
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| Fabrication and High Temperature Tribological Properties of Plasma Sprayed WC-Co-Cu-BaF2/CaF2 Selflubricating Wear Resistant Coatings |
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YUAN Jian-hui， ZHU Ying-chun， LEI Qiang， ZHAN Qing， HUANG Jing， DING Si-yue1,2
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1. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo Zhejiang 315201;2. Shanghai Institute of Ceramics, Chinese Academy of Sciences， Shanghai 200050
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| Abstract: |
| WC-Co-Cu-BaF2/CaF2 selflubricating wear resistant coating was deposited by atmospheric plasma spraying (APS) process using homemade feedstock powders composed of WC-Co, Cu and BaF2/CaF2 eutectic. The high temperature tribological properties of the WC-Co-Cu-BaF2/CaF2 and WC-Co coatings were investigated at 200 ℃，400 ℃ and 600 ℃. Microscopic observation of the coatings after wear was performed using SEM. It is found that the hard WC particles in the triboreaction layers of WC-Co-Cu-BaF2/CaF2 coating induce abrasive wear and result in higher friction coefficient and wear rate at 200 ℃. The triboreaction layers without any hard WC particles were formed in 400 ℃ and 600 ℃ wear tests. With the help of Cu and BaF2/CaF2 eutectic which acted as solid lubricants in the coating, the triboreaction layers became smooth and compact. Lower friction coefficient and wear rate of WC-Co-Cu-BaF2/CaF2 coating were achieved at these temperatures. The wear resistant behavior of WC-Co-Cu-BaF2/CaF2 coating was superior to that of WC-Co coating at relatively high temperature (400～600 ℃). |
| Key words: plasma spraying selflubricating high temperature tribological wear mechanism |
