THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Effects of contact pressure and interface temperature on thermal contact resistance between 2Cr12NiMoWV/BH137 and γ-TiAl/2Cr12NiMoWV interfaces

ABSTRACT
Thermal contact resistance (TCR) between interfaces is an important parameter in the analysis of temperature distribution for structural comonents. TCR between heat resistant steel 2Cr12NiMoWV/aluminum alloy BH137 interfaces and 2Cr12NiMoWV/titanium alloy γ-TiAl interfaces were experimentally investigated in the present paper. The effects of contact pressure and interface temperature were detailed. The temperature of contacting surfaces was from 80°C to 250°C, and the contact pressure ranged from 2 MPa to 17 MPa. All experiments were conducted in ambient atmosphere. Results showed that TCR decreases with an increment of interface temperature or contact pressure. Under the same conditions of contact pressure and interface temperature, TCR between 2Cr12NiMoWV and BH137 interfaces is lower than that between 2Cr12NiMoWV and γ-TiAl interfaces. The temperature dependence of thermal conductivity and mechanical properties was analyzed to explain the results. Furthermore, with the piston and piston pin as the research object, steady state temperature fields were simulated in cases of considering TCR and without considering TCR, respectively. The results showed that the maximum temperature of the piston pin will be lower when TCR is considered.
KEYWORDS
PAPER SUBMITTED: 2019-10-18
PAPER REVISED: 2019-12-04
PAPER ACCEPTED: 2019-12-08
PUBLISHED ONLINE: 2020-01-04
DOI REFERENCE: https://doi.org/10.2298/TSCI191018470L
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