Cr掺杂类金刚石碳基薄膜在发动机油环境下的摩擦学机制

doi:10.11901/1005.3093.2015.642

材料研究学报

2017, Vol. 31

Issue (1): 18-26 DOI: 10.11901/1005.3093.2015.642

本期目录 | 过刊浏览

Cr掺杂类金刚石碳基薄膜在发动机油环境下的摩擦学机制

郑韶先¹,任思明^1,³,蒲吉斌^2,³(

)

1 兰州交通大学机电工程学院兰州 730070
2 中国科学院海洋新材料与应用技术重点实验室浙江省海洋材料与防护技术重点实验室中国科学院宁波材料技术与工程研究所宁波 315201
3 中国科学院兰州化学物理研究所固体润滑国家重点实验室兰州 730000

Tribological Behavior of Cr Doped Diamond-like Carbon Coating in Engine Oil

Shaoxian ZHENG¹,Siming REN^1,³,Jibin PU^2,³(

)

1 School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2 Key Laboratory of Marine Materials and Related Technologies, Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
3 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

引用本文:

郑韶先,任思明,蒲吉斌. Cr掺杂类金刚石碳基薄膜在发动机油环境下的摩擦学机制[J]. 材料研究学报, 2017, 31(1): 18-26.
Shaoxian ZHENG, Siming REN, Jibin PU. Tribological Behavior of Cr Doped Diamond-like Carbon Coating in Engine Oil[J]. Chinese Journal of Materials Research, 2017, 31(1): 18-26.

全文: PDF(11535 KB) HTML

摘要:

系统研究了在发动机工作温度(180℃)铬掺杂类金刚石碳基薄膜(Cr-DLC)在聚α-烯烃(PAO润滑油)及含添加剂二烷基二硫代磷酸锌(ZDDP)的PAO润滑油中的摩擦磨损性能,用多种手段表征分析了Cr-DLC薄膜在润滑油介质中的摩擦机理。结果表明: 在含添加剂ZDDP的润滑状态下ZDDP衍生的润滑膜抑制了薄膜表面的石墨化,金属元素的掺入提高了薄膜的表面活性,加速了摩擦界面的化学反应,促进了润滑膜的形成和抗磨产物(CrO_x/CrPO₄)的积累,大大提高了Cr-DLC薄膜的摩擦学性能。

关键词 ：材料表面与界面, DLC, ZDDP, 摩擦磨损, 润滑膜, 摩擦化学反应

Abstract：

The tribological behavior of Cr doped diamond-like carbon coating (Cr-DLC) was investigated systematically in poly-alpha-olefin (PAO) oil at 180 °C (operating temperature of engine oil) with and without antiwear additive zinc dialkyldithiophosphate (ZDDP) for various applied loads. Then the worn surface was characterized by means of Energy dispersive X-ray spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. Results show that ZDDP-derived lubrication film can suppress the surface graphitization of Cr-DLC coating. In addition, the Cr-doping could increase the activity of friction surface to accelerate the tribochemical reaction between coating and ZDDP, which promoting the formation of lubrication film and the accumulation of antiwear products, therewith, improved tribological be havior of Cr-DLC coating in PAO with ZDDP additive.

Key words： surface and interface in the materials DLC ZDDP friction and wear lubrication film tribochemical reaction

收稿日期: 2015-11-11

基金资助:国家自然科学基金(51305433)和浙江省重点基金(LZ17E050004)

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.642 或 https://www.cjmr.org/CN/Y2017/V31/I1/18

表1 有限元模拟过程中材料的具体参数

图1 Cr-DLC薄膜的截面和表面形貌

图2 Cr-DLC薄膜在不同载荷下的von Mises 等效应力图

图3 Cr-DLC薄膜在不同载荷下的摩擦系数曲线

图4 Cr-DLC薄膜在PAO和PAO+ZDDP润滑下的磨损率

图5 Cr-DLC薄膜在100 N、不同润滑条件下磨痕的SEM照片和截面轮廓

图6 不同载荷条件下Cr-DLC薄膜与钢球分别在PAO(a, b, c, d)和PAO+ZDDP(e, f, g, h)对磨磨斑处的SEM照片

图7 在不同载荷条件下Cr-DLC薄膜与钢球分别在PAO(a, b)和PAO+ZDDP(c, d)对磨磨斑处的面分布图谱

图8 沉积态在施加载荷100 N和不同润滑条件下Cr-DLC薄膜磨痕内外的拉曼图谱

图9 钢球与Cr-DLC薄膜在100 N、PAO+ZDDP润滑介质中对磨后磨斑和磨痕处的XPS图谱

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