Low melting point thermal interface material

ITherm 2002. Eighth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.02CH37258) Pub Date : 2002-08-07 DOI:10.1109/ITHERM.2002.1012519

R. Webb, J. Gwinn

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引用次数: 29

Abstract

A high performance thermal interface material has been developed that consists of a 25 /spl mu/m coating of low-melting-temperature alloy (LMTA) tinned on each side of a 50 /spl mu/m copper substrate. The alloy has a melting point below the maximum CPU operating temperature. Steady-state tests per ASTM D-5470 show 0.058 K-cm/sup 2//W at 138 kPa contact pressure. Contact pressures as small as 34 kPa are permissible. Thermal cycling tests (1000 cycles) show negligible performance degradation, if the temperature is cycled less than 12 K above the melting point. Thermal cycling 20 K above the melting point results in degradation due to formation of a low thermal conductivity intermetallic alloy at the LMTA-copper interface. Removal and replacement of the LMTA results in negligible increase in interface resistance. Manufacturing methods are discussed, and a concept for the application of LMTA to the CPU-heatsink interface is presented. The LMTA alloy offers performance competitive with the best thermal grease, without the "messy" disadvantages of thermal grease.

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低熔点热界面材料

开发了一种高性能热界面材料，该材料由25 /spl μ m的低熔温合金(LMTA)涂层组成，镀在50 /spl μ m的铜基板两侧。合金的熔点低于CPU的最高工作温度。根据ASTM D-5470进行的稳态测试显示，在138 kPa接触压力下，0.058 K-cm/sup 2//W。接触压力可小至34kpa。热循环测试(1000次循环)显示，如果循环温度低于熔点以上12 K，则性能下降可以忽略不计。熔点以上20k的热循环导致降解，这是由于lta -铜界面上形成了低导热的金属间合金。移除和替换LMTA导致界面电阻的增加可以忽略不计。讨论了制造方法，并提出了LMTA在cpu -散热器接口中的应用概念。LMTA合金提供了与最佳导热脂竞争的性能，而没有导热脂的“凌乱”缺点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ITherm 2002. Eighth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.02CH37258)

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