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A novel approach to tribological measurements at harsh conditions

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Author: Weltevreden, E.R. · Heide, E. van der
Type:article
Date:2011
Source:Cryogenic Optical Systems and Instruments XIII, 24-25 August 2011, San Diego, CA, USA. Conference code: 86998, 8150
series:
Proceedings of SPIE - The International Society for Optical Engineering
Identifier: 442964
ISBN: 9780819487605
Article number: No.: 815003
Keywords: Materials · Cryogenic · Durability · Material combinations · Tribology · Vacuum · Contact pressures · Cryo-tribometer · Cryogenic vacuum · Extreme conditions · Extreme environment · Friction and wear · High-tech equipments · Low temperatures · Material combination · Material combinations · Measuring applications · Position mechanism · Rolling contacts · Sliding velocities · Cryogenics · Durability · Friction · Lubricating oils · Mineral oils · Optical systems · Vacuum · Tribology · Mechatronics, Mechanics & Materials · MIP - Materials for Integrated Products · TS - Technical Sciences

Abstract

When dealing with high-tech equipment, accurate positioning is of the utmost importance to ensure durability and a productive lifetime. Unexpected high friction or wear of positioning mechanisms can lead to unnecessary down-time or products that are not up to specification. To ensure a sufficient lifetime, it is necessary to know beforehand how the sliding and rolling contacts will behave over time. This demand becomes more stringent when the machine operates at extreme conditions, e.g. vacuum or extremely low temperatures. Traditional greases and mineral oil based lubricants do not perform adequately in such extreme environments, as they either contaminate the vacuum or do not provide sufficient film thickness. TNO recently developed a unique measuring application, the TNO cryotribometer, in order to measure friction and wear of position mechanisms at harsh conditions. Preliminary results show that the contact pressure and the sliding velocity influenced the friction level greatly. This set-up is currently used to find and analyze different material combinations, which demonstrate a constant friction level under cryogenic vacuum conditions. © 2011 SPIE.