RESEARCH PAPERS: Contact Conductance

Effects of Metallic Vapor Deposition Process and the Overall Coating Thickness on Thermal Contact Conductance

[+] Author and Article Information
A. H. Howard, G. P. Peterson

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843

J. M. Ochterbeck

Department of Mechanical Engineering, Clemson University, Clemson, SC 29634

J. Heat Transfer 117(4), 828-834 (Nov 01, 1995) (7 pages) doi:10.1115/1.2836298 History: Received January 01, 1995; Revised July 01, 1995; Online January 23, 2008


An investigation was conducted to determine the effects of the vapor deposition process and. the interstitial coating thickness on the overall joint conductance of metallic interfaces. Eight aluminum 6061-T6 test specimens were coated with indium and tested while in contact with uncoated aluminum 6061-T6 specimens. In the first test set, all specimens were coated to a thickness of 3.51 μm, but the vapor deposition process was varied to produce both single and multiple-layered coated specimens. In the second test set, the coating thickness was varied from 0.026 μm to 3.51 μm. The results indicated that when creating multiple layered coatings, oxidation and thermal cycling caused poor layer adhesion, and resulted in significantly reduced dimensionless contact conductance enhancement factors than for single-layered coatings with an equivalent thickness. Additionally, the results demonstrated that the thermal contact conductance could be enhanced to much greater levels than previously reported in the literature, and that the dimensionless enhancement factor asymptotically approached a maximum enhancement value. A theoretical maximum enhancement limit has been presented for comparison with the experimental data.

Copyright © 1995 by The American Society of Mechanical Engineers
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