| SPACE LUBRICATING MATERIALS |
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| Effect of Key Process Parameters on the Properties of Oil-impregnated Porous Polyimide Retainers |
| HE Ying1,2, HU Jixing1, HU Hanjun1, WANG Shiwei1, HUO Lixia1, ZHOU Hui1, ZHANG Kaifeng1,*, GAO Hong3
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1 National Key Laboratory on Vacuum Technology and Physics, Lanzhou Institute of Physics, Lanzhou 730000, China
2 School Chemistry and Chemicl Engineering, Central South University, Changsha 410083, China
3 China Academy of Space Technology, Beijing 100094, China |
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Abstract Oil-impregnated porous polyimide (PI) exhibits excellent corrosion resistance and self-lubricating properties. Unique pore structure of the material enables sustained and stable oil storage and supply, making it widely applicable in bearing retainers to ensure reliable lubrication during operation. This study systematically investigates the effects of key process parameters—including powder particle size, pressure-retaining process, and sintering methods—on the pore microstructure, oil retention capacity, and tribological properties of porous PI. The forming process for porous PI retainers is further optimized through experimental analysis. Results demonstrate that porous PI synthesized using 200-mesh particles, a multi-stage pressure release process (≥2 cycles), and constant-volume sintering achieves optimal comprehensive performance. The material maintains an oil content of approximately 23%, an oil retention rate exceeding 99%, a coefficient of friction below 0.09 under atmospheric conditions and vacuum environments. The optimized forming process shows significant application potential for manufacturing high-precision, long-service-life retainers in high-speed bearings operating under harsh aerospace conditions.
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Published: 10 August 2025
Online: 2025-08-13
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