| WEI Ao-bo,MA Guo-zheng,LI Guo-lu,YONG Qing-song,GUO Wei-ling,XIN Zhi-guo,WANG Hai-dou.Spatial Environmental Factors on the Wear Life of Coated Self-lubricating Joint Bearings Influence Law and Mechanism[J],51(11):10-19 |
| Spatial Environmental Factors on the Wear Life of Coated Self-lubricating Joint Bearings Influence Law and Mechanism |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.11.002 |
| KeyWord:space environment H-DLC film joint bearing self-lubrication wear life wear mechanism |
| Author | Institution |
| WEI Ao-bo |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China;Key Laboratory of National Defense Science and Technology of Equipment Remanufacturing Technology,, Beijing , China |
| MA Guo-zheng |
Key Laboratory of National Defense Science and Technology of Equipment Remanufacturing Technology,, Beijing , China |
| LI Guo-lu |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China |
| YONG Qing-song |
Facility Design and Instrumentation Institute of China Aerodynamics Research and Development Center, Sichuan Mianyang , China |
| GUO Wei-ling |
Key Laboratory of National Defense Science and Technology of Equipment Remanufacturing Technology,, Beijing , China |
| XIN Zhi-guo |
Key Laboratory of National Defense Science and Technology of Equipment Remanufacturing Technology,, Beijing , China |
| WANG Hai-dou |
Key Laboratory of National Defense Science and Technology of Equipment Remanufacturing Technology,, Beijing , China ;National Engineering Research Center for Mechanical Product Remanufacturing, Army Academy of Armored Forces, Beijing , China |
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| Abstract: |
| Self-lubricating joint bearings have replaced traditional ball bearings in some weapons and equipment, aerospace, large water conservancy equipment and other fields because of their strong load-bearing capacity, simple structure, no regular lubrication, high reliability and other advantages. In recent years, with the rapid development of aerospace technology, aerospace vehicles have increasingly high performance requirements for self-lubricating joint bearings. At present, a type of self-lubricating joint bearings with self-lubricating coating as wear-reducing lubricating material has attracted the attention of researchers and has been extensively researched. In this study, the GE17 type joint bearing produced by Fujian Longxi Bearing Co., Ltd. is used as the research object. The self-lubricating material is selected as hydrogen-containing diamond-like film, and the preparation process is non-equilibrium magnetron sputtering technology, and the inner and outer rings of the bearing are coated separately, and then the inner and outer rings of the bearing are assembled together by professional equipment. The self-lubricating joint bearing wear life test device is used with MSTS-1 multi-functional vacuum friction and wear tester to realize the wear life test of self-lubricating joint bearing with coupled space environment factors. The full-life wear test was conducted in four environments:atmosphere, vacuum, atomic oxygen erosion and ultraviolet irradiation, respectively, during which the vacuum was no greater than 10‒4 Pa, the atomic oxygen and ultraviolet test parameters were:atomic oxygen energy 5 eV, flux density≥2.0×1015 atoms/(cm2.s), ultraviolet irradiation intensity 5 solar constants, and irradiation time 12 h. The measured the operating parameters of the bearings were:oscillation angle ±15°, oscillation frequency of 2 Hz, radial load of 150 N. At the end of the test, the wear marks of the inner and outer rings of the joint bearings with wear loss under different environments were characterized by means of a swept electron microscope and a white light three-dimensional profiler. It was found that both the friction torque signal and the friction surface temperature signal during the wear process of the joint bearing in different environments can be used as the physical signal of the bearing wear loss, but the abrupt change point of the temperature signal is earlier than the torque signal; the average wear life of the joint bearing in the four environments of atmosphere, vacuum, atomic oxygen erosion and UV irradiation were 87.48 h, 30.55 h, 17.06 h and 29.37 h. Adhesive wear and abrasive wear mainly occurred in all four environments, and some oxidation wear also existed in the bearings after atomic oxygen erosion. In addition, the inner ring of the bearing wears more seriously than the outer ring of the bearing, and the outer ring of the bearing is more likely to adsorb a large amount of spherical abrasive chips. Therefore, it is concluded that the frictional heat generated by the inner and outer rings of the bearing cannot be discharged quickly due to the vacuum environment, so the temperature of the frictional contact surface of the bearing is higher and the performance of the H-DLC film decreases, which leads to a significant decrease in the bearing wear life. UV irradiation has little effect on bearing wear life. |
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