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Impact of test-environment and cryogenic aging on mechanical properties and tribological performance of PI-based materials
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Portugal.ORCID iD: 0000-0002-8025-5104
CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Portugal.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-8676-8819
(English)Manuscript (preprint) (Other academic)
Abstract [en]

This study investigates the effect of test-environment, temperature, and cryogenic aging in liquid nitrogen for 5 months on mechanical and tribological performance of polyimide (PI) and PI composites. Tribological tests were conducted at 25 °C in air, and at both 25 °C and -100 °C in a high vacuum (10-5 Pa) environment. Impact of cryogenic aging, testing condition on PI-based materials varied depending on the polymer structure and composition. Cryogenic aging led to embrittlement, increasing the coefficient of friction and wear rate up to 77% and 165%, respectively. Some polyimides exhibited the lowest coefficient of friction (0.04) in vacuum at 25°C, while the temperature reduction to -100 oC in vacuum generally decreased the tribological performance, increased contact stresses and abrasive wear of the materials. 

Keywords [en]
polyimide, vacuum, cryogenic temperature, cryogenic aging
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:ltu:diva-105593OAI: oai:DiVA.org:ltu-105593DiVA, id: diva2:1860623
Available from: 2024-05-24 Created: 2024-05-24 Last updated: 2024-05-27
In thesis
1. Tribological and Mechanical Performance of Thermoplastic Composites: Effect of Cryogenic Aging and Testing-Environment
Open this publication in new window or tab >>Tribological and Mechanical Performance of Thermoplastic Composites: Effect of Cryogenic Aging and Testing-Environment
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2024
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-105597 (URN)978-91-8048-589-0 (ISBN)978-91-8048-590-6 (ISBN)
Public defence
2024-09-03, Luleå University of Technology, Luleå, 10:00 (English)
Opponent
Supervisors
Available from: 2024-05-27 Created: 2024-05-27 Last updated: 2024-05-27Bibliographically approved

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Nikonovich, MaksimEmami, Nazanin

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