Journal
TRIBOLOGY INTERNATIONAL
Volume 190, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2023.109053
Keywords
Porous polyimide; blackening failure; Cr content; oil degradation
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This study reveals distinct tribological behaviors of PAO oil-impregnated PPI surfaces when sliding against 440 C and GCr15 steel bearing balls. The interface of 440 C/PPI exhibits fewer black products, lower friction, and reduced wear compared to GCr15/PPI. This is attributed to the formation of a robust Cr oxide film on the surface of 440 C steel balls, mitigating PAO oil degradation.
The tribological failures of poly-alpha-olefin (PAO) oil-impregnated porous polyimide (PPI) undermine the long-term reliability of aerospace bearing cages, often resulting in black product formation. Thus, addressing blackening is crucial. This study uncovers distinct tribological behaviors of PAO oil-impregnated PPI surfaces when sliding against 440 C and GCr15 steel bearing balls. Compared to GCr15/PPI, the 440 C/PPI interface exhibits fewer black products, lower friction, and reduced wear. Analysis attributes this to the higher Cr content in 440 C steel balls, facilitating a robust and dense Cr oxide film on their surfaces, which mitigates PAO oil degradation from tribo-chemical reactions with iron. Lastly, a universal approach involving Cr ion injection onto steel ball surfaces significantly enhances the tribological performance and blackening resistance of PAO oil-impregnated PPI.
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