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학술저널
저자정보
민경은 (한국생산기술연구원 용접접합기술센터/마이크로조이닝센터) 김해연 (한국생산기술연구원 용접접합기술센터/마이크로조이닝센터) 방정환 (한국생산기술연구원 용접접합기술센터/마이크로조이닝센터) 김종훈 (한국생산기술연구원 용접접합기술센터/마이크로조이닝센터) 김준기 (한국생산기술연구원 용접접합기술센터/마이크로조이닝센터)
저널정보
한국재료학회 한국재료학회지 한국재료학회지 제21권 제5호
발행연도
2011.1
수록면
283 - 287 (5page)

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초록· 키워드

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As the performance of microelectronic devices is improved, the use of copper as a heat dissipation member is increasing due to its good thermal conductivity. The high thermal conductivity of copper, however, leads to difficulties in the joining process. Satisfactory bonding with copper is known to be difficult, especially if high shear and peel strengths are desired. The primary reason is that a copper oxide layer develops rapidly and is weakly attached to the base metal under typical conditions. Thus, when a clean copper substrate is bonded, the initial strength of the joint is high, but upon environmental exposure, an oxide layer may develop, which will reduce the durability of the joint. In this study, an epoxy adhesive formulation was investigated to improve the strength and reliability of a copper to copper joint. Epoxy hardeners such as anhydride, dihydrazide, and dicyandiamide and catalysts such as triphenylphosphine and imidazole were added to an epoxy resin mixture of DGEBA and DGEBF. Differential scanning calorimetry (DSC) analyses revealed that the curing temperatures were dependent on the type of hardener rather than on the catalyst, and higher heat of curing resulted in a higher Tg. The reliability of the copper joint against a high temperature and high humidity environment was found to be the lowest in the case of dihydrazide addition. This is attributed to its high water permeability, which led to the formation of a weak boundary layer of copper oxide. It was also found that dicyandiamide provided the highest initial joint strength and reliability while anhydride yielded intermediate performance between dicyandiamide and dihydrazide.

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