| 摘要: |
| 为了评估 a-C ∶H 和 ta-C 涂层应用于铝合金干式切削刀具表面防护的可行性,在 M2 高速钢基底上,用 RFPECVD 方法沉积 a-C ∶H 涂层,用磁过滤阴极真空电弧方法沉积了 ta-C 涂层。 通过热重试验观测两种涂层在升温过程中的质量变化。 将这两种涂层在大气环境退火,用拉曼光谱等方法表征涂层的结构,用纳米压痕法测量涂层硬度。 通过大气环境下的球盘摩擦磨损试验,比较 a-C ∶H 和 ta-C 涂层的对7075 铝合金摩擦学性能。 结果显示:经过 400 ℃退火,a-C ∶H 涂层硬度从24. 8 GPa 下降至 20. 0 GPa,ta-C 涂层硬度从 28. 7 GPa 增加至 30. 8 GPa;a-C ∶H 涂层对7075 铝合金的摩擦因数从 0. 17 下降至 0. 14,ta-C 涂层摩擦因数保持不变为 0. 12;a-C ∶H 涂层磨损率从1. 9×10 -15 m 2·N -1上升至 2. 4×10 -15 m 2·N -1 ,ta-C 涂层磨损率从 8. 0×10 -16 m 2·N -1上升至 9. 2×10 -16 m 2·N -1 。当采用 7075 铝合金为对偶摩擦件时,ta-C 具有比 a-C ∶H 涂层更低的摩擦因数和磨损率,而且随温度变化更稳定,因此 ta-C 是一种更有前途的铝合金干式切削刀具防护涂层。 |
| 关键词: 类金刚石 a-C ∶ H ta-C 摩擦 磨损 石墨化 退火 7075 铝合金 |
| DOI：10.11933/j.issn.1007-9289.20190905001 |
| 分类号:TG174.44;TG115.58 |
| 文章编号:1007-9289(2020)01-0047-08 |
| 文献标识码:A |
| 基金项目:深圳市科技创新委员会基础研究项目(JCYJ20180302153906051) |
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| Tribological Properties of a-C ∶ H and ta-C Coatings on 7075 Aluminum Alloys |
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Huang Zhihong1, Yang Dou2, Yang Bing2, Liu Chuansheng3
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1.Department of Mechanical Engineering, Wenzhou Polytechnic, Wenzhou 325035 , China;2.School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072 , China;3.Ion Beam Laboratory, Shenzhen Institute of Wuhan University,Shenzhen 518057 , China
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| Abstract: |
| To assess the feasibility of a-C ∶H and ta-C coatings as surface protection coating on tools for dry cutting of aluminum alloys, on the M2 high-speed steel substrate, the a-C ∶H coating was deposited using the radio frequency PECVD method, and the ta-C coating was deposited using the magnetic filter cathode vacuum arc method. Then the two diamond-like carbon (DLC) coatings were annealed in the atmosphere. The structure and mechanical properties of the coating were characterized by Raman spectroscopy and nanometer indentation. The tribological properties of the a-C ∶H and ta-C coatings against 7075 aluminum alloy were measured by using a ball-on-plate tribotester under atmospheric environment. Results show that after annealing at 400 ℃, the hardness of the a-C ∶H coating decreased from 24. 8 GPa to 20. 0 GPa, and that of the ta-C coating increased from 28. 7 GPa to 30. 8 GPa. The friction coefficient of the a-C ∶H coating against the 7075 aluminum alloy decreased from 0. 17 to 0. 14, and the friction coefficient of the ta-C coating remained at 0. 12. The wear rate of the a-C ∶H coating increased from 1. 9×10 -15 m 2·N -1 to 2. 4×10 -15 m 2·N -1 , and the wear rate of the ta-C coating increased from 8. 0×10 -16 m 2·N -1 to 9. 2×10 -16 m 2·N -1 . When sliding against the 7075 aluminum alloy, the ta-C has a lower friction coefficient and wear rate than the a-C ∶H coating, and is more stable with temperature changes. Therefore, ta-C is a more promising aluminum alloy dry cutting tool protective coating |
| Key words: diamond-like carbon (DLC) a-C ∶H ta-C friction wear graphitization annealing 7075 aluminum alloys |
