We obtained data on thermal contact resistance for contact interfaces between UN and several other metals in vacuum at about 50°C:UN-In, UN-type 1100 Al, UN-Cu, UN-V-15% Cr-5% Ti, UN-Mo, UN-UN, and three UN-type 302 stainless steel interfaces. Many variables affected the results, and the correlation of the data showed the rela¬tive importance of stress, hardness, thermal conductivity, and surface topography. The correlation obtained from the data also suggests means for reducing thermal contact resistance in fuel elements;these possibilities are discussed.
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