Browse > Article

Failure Path of the Brown-oxide-coated Copper-based Leadframe/EMC Interface under Mixed-Mode Loading  

이호영 (서울대학교 기계항공공학부)
Publication Information
Journal of the Korean institute of surface engineering / v.36, no.6, 2003 , pp. 491-499 More about this Journal
Abstract
Copper-based leadframe sheets were oxidized in a hot alkaline solution to form brown-oxide layer on the surface and molded with epoxy molding compound (EMC). The brown-oxide-coated leadframe/EMC joints were machined to form sandwiched double-cantilever beam (SDCB) specimens and sandwiched Brazil-nut (SBN) specimens for the purpose of measuring the fracture toughness of leadframe/EMC interfaces. The SDCB and the SBN specimens were designed to measure the fracture toughness of the leadframe/EMC interfaces under nearly mode-I loading and mixed-mode (mode I ＋ mode II) loading conditions, respectively. Fracture surfaces were analyzed by various equipment such as glancing-angle XRD, SEM, AES, EDS and AFM to elucidate failure path. Results showed that failure occurred irregularly in the SDCB specimens, and oxidation time of 2 minutes divided the types of irregular failures into two classes. The failure in the SBN specimens was quite different from that in the SDCB specimens. The failure path in the SBN specimens was not dependent on the phase angle as well as the distance from tips of pre-cracks.
Keywords
Mixed-mode loading; Brown oxide; Adhesion strength; Phase angle; Failure path;
Citations & Related Records
연도 인용수 순위
  • Reference
1 H. Lee, Y. Y. Earmme, IEEE CPMT, 19 (1996) 168
2 H. Y. Lee, Mater. Sci. Eng., A311 (2001) 217
3 C. Kembell, Adhesion, D. D. Eley, Oxford University Press, London, (1961) 19
4 F. Roudet, Y. Desplanques, S. Degallaix, Int. J. Fatigue, 24 (2002) 327   DOI   ScienceOn
5 B. Fiedler, M. Hojo, S. Ochiai, K. Schulte, M. Ando, Compos. Sci. Tech., 61 (2001) 1615   DOI   ScienceOn
6 A. A. Gallo, R. Munamarty, IEEE Trans. Reliab.,44 (1995) 362   DOI   ScienceOn
7 S. Omi, K. Fujita, T. Tsuda, T. Maeda, IEEE CHMT, 14 (1991) 818
8 B. J. Love, P. F. Packham, J. Adhesion, 40 (1993) 139   DOI   ScienceOn
9 이호영, 김성룡, 한국표면공학회지, 33 (2000) 241
10 Z. Suo, J. W. Hutchinson, Mater. Sci. Eng., A107 (1989) 135
11 이호영, 한국표면공학회지, 36 (2003) 347
12 M.-Y. He, A. Bartlett, A. G. Evans, J. Am. Ceram. Soc., 74 (1991) 767   DOI
13 D. Stevanovic, S. Kalyanasundaram, A. Lowe, P.-Y. B. Jar, Compos. Sci. Tech., 63 (2003) 1949   DOI   ScienceOn
14 이호영, 유 진, 한국재료학회지, 9 (1999) 992