| 摘要: |
| 针对含Co质量分数不同的Ni-Co电镀层，通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)和显微硬度表征其组织结构和硬度，采用高温销/盘磨损试验机评价其在室温和280 ℃时与35CrMo钢销或Si3N4陶瓷球配副时的耐磨性。结果表明：随Co质量分数增加，结晶取向变化、晶粒细化和固溶强化作用将镀层硬度从2.03 GPa提高至3.96 GPa，增强抵抗硬质点犁削的能力。280 ℃试验后，镀层的磨损量相比室温成倍增加，与钢销对摩后，1.5%Co镀层磨痕表面粘附钢销材料，其磨损量低于硬度较高的27%Co镀层；与陶瓷球对摩后，27%的Co质量分数促进磨损过程中生成Co的氧化物和形成耐磨的摩擦反应层，使镀层磨损量相比1.5%Co镀层下降65.4%。结合结晶器使用工况考虑，27% Co有利于提高Ni-Co电镀层的耐磨性。 |
| 关键词: Ni-Co电镀层 耐磨性 结晶器铜板 摩擦反应层 |
| DOI：10.3969/j.issn.1007-9289.2013.06.016 |
| 分类号: |
| 基金项目: |
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| Wear Resistance of Ni-Co Electrodeposited Coatings on Copperplate of Crystallizer |
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GENG Zhe, LIU Yang, ZHANG Hongjie, LI Shu1,2
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1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016;2.No.1 Steelmaking Plant of Anshan Iron and Steel Co., Anshan 114011, Liaoning
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| Abstract: |
| Ni-Co electrodeposited coatings containing different amounts of Co were investigated. Their microstructure and hardness were characterized by scanning electron microscope (SEM), Xray diffraction (XRD) and microhardness tester. The wear behavior of Ni-Co coatings rubbing with 35CrMo steel pins or Si3N4 ceramic balls was evaluated by a pinondisk tribometer at room temperature and 280 ℃. The results show that the coating hardness increases from 2.03 GPa to 3.96 GPa and the wear resistance against hard particles plowing is enhanced because of the change of crystal orientation, grain refinement and solid solution strengthening when the Co content increases. The wear volumes of coatings are several times higher at 280 ℃ than that at 25 ℃. After rubbing with a steel pin, the worn track of 1.5%Co coating is adhered by the pin material, resulting in the wear volume abnormally lower than 27%Co coating with higher hardness. After rubbing with a ceramic ball, 27% Co content can promote the generation of cobalt oxides and the formation of tribofilm during the frictional process, making the volume loss of coating decrease by 65.4% compared with 1.5%Co coating. As the working conditions of crystallizer are considered, 27% Co content is beneficial for improving the wear resistance of Ni-Co coatings. |
| Key words: Ni-Co electrodeposited coating copperplate of crystallizer wear resistance tribofilm |
