Formation of solder cap on Cu pillar bump using formic acid reduction

Monta, Masaru; Okiyama, Kouichi; Sakai, Taiji; Imaizumi, Nobuhiro

doi:10.1109/eptc.2012.6507153

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…On the basis of the previous studies [2][3][4][5][6] , the method of using formic acid atmosphere is believed to be a promising technique for fluxless soldering. The oxide films of conventional Sn-3.0Ag-0.5Cu are mostly composed of SnO and SnO 2 7)…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the reaction of formic acid (HCOOH) atmosphere with solder (Sn) oxide can be described as follows 3) :…”

Section: Introductionmentioning

confidence: 99%

“…In fluxless soldering studies, one promising method was using reducing atmosphere such as hydrogen and formic acid. For instance, formic acid atmosphere is used to remove the native oxide of a solder on a copper pillar 3) . Hanss, et al 4) have reported a fluxless soldering process for LED packaging under formic acid atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Thermal Aging on the Impact Strength of Soldered Bumps under Formic Acid Atmosphere

Nishikawa

2017

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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In this study, we have investigated the effect of thermal aging on impact strength of Sn-Ag-Cu solder bumps in fluxless soldering process using formic acid atmosphere. We conducted impact tests on as-reflowed and thermally-aged solder bumps, which were fabricated on either formic acid atmosphere or a liquid flux. The results indicated that the morphology of the intermetallic compound layers in samples soldered using formic acid was similar to those soldered with the liquid flux, after soldering and after thermal aging. The fluxless solder bumps, using formic acid atmosphere, have impact strengths similar to the solder bumps obtained using the liquid flux in nitrogen atmosphere

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