Abstract
This study describes the interfacial thermal performance of low melting temperature alloys (LMAs) for the application as thermal interface materials (TIMs). The thermal performance of LMAs evaluated in terms of accelerated life cycle testing, which included highly accelerated stress testing (HAST) at 85oC and 85%RH and thermal cycling from −40°C to +125°C. Three lead and cadmium free low melting alloys (75.5Ga &24.5In, 100Ga, and 51In, 32.5Bi &16.5Sn) were tested as candidate LMAs. ASTM D 5470 testing methodologies were used to evaluate thermal performance of LMAs as well as some commercial TIMs (greases, phase change materials). Results showed that the proposed alloys survived 960 hours of highly accelerated stress testing (85°C and 85% RH) and 500 cycles from −40°C to +125°C without significant performance degradation.
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