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자동차 전장모듈용 Sn-Cu-Cr(Ca) 중온 솔더의 접합특성 연구

Joint Property of Sn-Cu-Cr(Ca) Middle Temperature Solder for Automotive Electronic Module

  • 방정환 (한국생산기술연구원 마이크로조이닝센터) ;
  • 유동열 (한국생산기술연구원 마이크로조이닝센터) ;
  • 고용호 (한국생산기술연구원 마이크로조이닝센터) ;
  • 김정한 (한국생산기술연구원 마이크로조이닝센터) ;
  • 이창우 (한국생산기술연구원 마이크로조이닝센터)
  • Bang, Junghwan (Micro-Joining Center in Korea Institute of Industrial Technology) ;
  • Yu, Dong-Yurl (Micro-Joining Center in Korea Institute of Industrial Technology) ;
  • Ko, Yong-Ho (Micro-Joining Center in Korea Institute of Industrial Technology) ;
  • Kim, Jeonghan (Micro-Joining Center in Korea Institute of Industrial Technology) ;
  • Lee, Chang-Woo (Micro-Joining Center in Korea Institute of Industrial Technology)
  • 투고 : 2013.09.17
  • 심사 : 2013.10.28
  • 발행 : 2013.10.31

초록

Joint properties of vehicle ECU (Electric Control Unit) module which was manufactured by using Sn-Cu-Cr-Ca alloy were investigated. A new solder which has a middle melting temperature about $231^{\circ}C$ was fabricated as the type of 300um solder ball and paste type. The prototype modules were made by reflow process and measured spreadability, wettability shear strength and estimated interface reaction. The spreadability of the alloy was about 84% from the measurement of contact angle of the solder ball and the wetting force was measured 2mN. The average shear strength of the module which was manufactured by using the solder paste, was 1.9 $kg/mm^2$. Also, the thickness of IMC(intermetallic compound) was evaluated with various aging temperature and time in order to understand Cr effect on Sn-0.7Cu solder. $Cu_6Sn_5$ IMC was formed between Cu pad and the solder alloy and the average thickness of the $Cu_6Sn_5$ IMC was measured about 4um and it was about 50% of thickness of $Cu_6Sn_5$ IMC in Sn-0.7Cu. It is expected to have a positive effect on reliability of the solder joint.

키워드

참고문헌

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