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- W3182871022 abstract "Printed Wiring Multilayer Board (PWMLB) structures for high speed, high density circuits are prone to failure due to the microcracking of electrolytic copper interconnections. The failure can occur in the foil that makes up the inner layer traces or in the plated through holes (PTH) deposit that forms the layer to layer interconnections. It is shown that there are some distinctive differences in the quality of Type E copper and that these differences can be detected before its use in a PWMLB. It is suggested that the strength of some Type E copper can be very low when the material is hot and that it is the use of this poor quality material in a PWMLB that results in PTH and inner layer microcracking. Since the PWMLB failure in question are induced by a thermal stress, and since the poorer grades of Type E materials used in these structures are susceptible to premature failure under thermal stress, the use of elevated temperature rupture and creep rupture testing is proposed as a means for screening copper foil, or its PTH equivalent, in order to eliminate the problem of Type E copper microcracking in advanced PWMLBs." @default.
- W3182871022 created "2021-07-19" @default.
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- W3182871022 date "1987-08-01" @default.
- W3182871022 modified "2023-09-27" @default.
- W3182871022 title "Rupture testing for the quality control of electrodeposited copper interconnections in high-speed, high-density circuits" @default.
- W3182871022 hasPublicationYear "1987" @default.
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