Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 277, Issue 1-2, Pages 154-160Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(99)00536-5
Keywords
copper-based leadframe; brown oxide; black oxide; epoxy; interfacial fracture toughness
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A copper-based leadframe is oxidized in two types of alkaline solutions; one forming brown oxide and the other forming black oxide, and molded with epoxy. SEM and X-ray studies on the surfaces of oxidized leadframe and fracture-toughness measurements by using sandwiched double-cantilever beam (SDCB) specimens showed that the interfacial fracture toughness is directly related to the formation of acicular CuO precipitates at the interface. However, once a continuous layer of CuO precipitates formed on the leadframe (brown oxide) or the underlying Cu2O layer (black oxide), interfacial fracture toughness saturated regardless of further oxide thickening. The size of the acicular precipitates was found to have secondary effects on the interfacial fracture toughness. (C) 2000 Elsevier Science S.A. All rights reserved.
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