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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Cr2O3涂层/SiC块体在水润滑下的磨损机制和润滑状态

郑学斌; 黄民辉; 陈忠明; 谭寿洪; 夏继余; 丁传贤   

  1. 中国科学院上海硅酸盐研究所; 上海200050
  • 收稿日期:1997-06-17 修回日期:1997-07-04 出版日期:1998-08-10 网络出版日期:1998-08-10

Wear Mechanism and Lubrication State of Plasma-Sprayed Cr2O3 Coating Against SiC Bulk Under Water Lubrication

ZHENG Xue-Bin; HUANG Min-Hui; CHEN Zhong-Ming; TAN Shou-Hong; XIA Ji-Yu; DING Chuan-Xian   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1997-06-17 Revised:1997-07-04 Published:1998-08-10 Online:1998-08-10

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摘要： 本文以等离子喷涂Cr2O3涂层和SiC块体组成摩擦副，考察其在水润滑条件下的摩擦磨损性能，应用SEM、XPS等技术观察和分析了磨痕和磨屑的形貌、元素分布和物相组成．目的是揭示该摩擦副在不同工况条件下的磨损机制和润滑状态．结果表明：Cr2O3涂层／SiC块体摩擦副的摩擦系数和磨损系数都非常小；Cr2O3涂层的磨损机理为气孔边缘的微断裂和塑性变形；SiC的磨损表现为摩擦化学反应生成SiO2及SiO2在水中的溶解．Cr2O3涂层和SiC块体的磨损对载荷和速度的稳定性较好．摩擦副在高载荷低速时处于边界润滑状态，在低载荷或高速情况下处于部分弹流润滑状态．

关键词: 等离子喷涂Cr2O3涂层, SiC, 磨损机制, 润滑

Abstract: Friction and wear properties of plasma-sprayed Cr2O3 coating against SiC bulk at different loads and sliding velocities under
water lubrication were investigated . Worn surfaces and wear debris were examined by means of SEM and XPS. The aim was to reveal wear mechanism and
lubrication state of the pairs under different testing conditions. The results obtained indicate that friction coefficients and wear coefficients
for Cr2O3 coating and SiC bulk pairs are quite low. Wear mechanism of Cr2O3 coating is microfracture along the borders of pores and
plastic deformation, and wear mechanism of SiC bulk is formation of SiO2 through tribochemical reaction and dissolution of SiO2 in water. Wear
mechanisms of Cr2O3 coating and SiC bulk are steady upon normal loads and sliding velocities. The pairs are in boundary lubrication state
at low velocities and high loads and in partial elasto-hydrodynamic lubrication either at high velocities or at low loads.

Key words: plasma-sprayed chromium oxide coating, silicon carbide bulk, wear mechanism, lubrication

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