Friction Characteristics of SUS440C/Si3N4 Lubricated by Polytetrafluoroethylene Under Cryogenic Environment-Reference-Cited by-同舟云学术

Friction Characteristics of SUS440C/Si3N4 Lubricated by Polytetrafluoroethylene Under Cryogenic Environment

Published:2023-05-19 Issue:10 Volume:145 Page:
ISSN:0742-4787
Container-title:Journal of Tribology
language:en
Short-container-title:

Author:

Kakudo Hiromitsu¹,Takada Satoshi¹,Hirayama Tomoko²

Affiliation:

1. Japan Aerospace Exploration Agency , 1 Koganezawa, Kimigaya-aza, Kakuda, Miyagi 981-1525 , Japan

2. Kyoto University Department of Mechanical Engineering and Science, , Katsura, Nishikyo-ku, Kyoto 615-8540 , Japan

Abstract

Abstract The friction characteristics of SUS440C-Si3N4 lubricated by polytetrafluoroethylene (PTFE) under cryogenic environment have not been researched well. The lubrication mechanisms in such friction condition need to be clarified to improve the fidelity of performance modeling for ball bearings used in liquid rocket engine turbopumps. This research experimentally investigated the friction coefficient of bearing materials via PTFE lubrication under cryogenic environment to clarify the friction characteristics of cryogenic turbopump ball bearings. These experiments revealed the dependence of the contact pressure on the friction coefficient. By several analyses, it was found that lower friction and better wear-resistance characteristics were caused by PTFE film that strongly adhered to metal fluoride formed on the surface of SUS440C due to moderate friction energy.

Publisher

ASME International

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials

Link

https://asmedigitalcollection.asme.org/tribology/article-pdf/145/10/101702/7014329/trib_145_10_101702.pdf

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