Thermal conductivity and flash temperature

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Title: Thermal conductivity and flash temperature
Authors: Reddyhoff, T
Schmidt, A
Spikes, H
Item Type: Journal Article
Abstract: The thermal conductivity is a key property in determining the friction-induced temperature rise on the surface of sliding components. In this study, a Frequency Domain Thermoreflectance (FDTR) method is used to measure the thermal conductivity of a range of tribological materials (AISI 52100 bearing steel, silicon nitride, sapphire, tungsten carbide and zirconia). The FDTR technique is validated by comparing measurements of pure germanium and silicon with well-known values, showing discrepancies of less than 3%. For most of the tribological materials studied, the thermal conductivity values measured are reasonably consistent with values found in the literature. However the measured thermal conductivity of AISI 52100 steel (21 W/mK) is less than half the value cited in the literature (46 W/mK). Further bulk thermal conductivity measurements show that this discrepancy arises from a reduction in thermal conductivity of AISI 52100 due to through-hardening. The thermal conductivity value generally cited and used in the literature represents that of soft, annealed alloy, but through-hardened AISI 52100, which is generally employed in rolling bearings and for lubricant testing, appears to have a much lower thermal conductivity. This difference has a large effect on estimates of flash temperature and example calculations show that it increases the resulting surface temperatures by 30 to 50%. The revised value of thermal conductivity of bearing steel also has implications concerning heat transfer in transmissions.
Issue Date: 1-Mar-2019
Date of Acceptance: 29-Dec-2018
URI: http://hdl.handle.net/10044/1/66970
DOI: https://dx.doi.org/10.1007/s11249-018-1133-8
ISSN: 1023-8883
Publisher: Springer Verlag
Start Page: 22
End Page: 22
Journal / Book Title: Tribology Letters
Volume: 67
Copyright Statement: © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Keywords: Science & Technology
Technology
Engineering, Chemical
Engineering, Mechanical
Engineering
Flash temperature
Thermal conductivity measurement
52100 steel
Scuffing
Lubrication
0912 Materials Engineering
0913 Mechanical Engineering
Mechanical Engineering & Transports
Open Access location: http://dx.doi.org/10.1007/s11249-018-1133-8
Online Publication Date: 2019-01-07
Appears in Collections:Mechanical Engineering
Faculty of Natural Sciences



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