| Project/Area Number |
07651039
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
有機工業化学
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| Research Institution | Tokyo Denki University |
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Principal Investigator |
SHIBA Ryuich Faculty of Engineering, Tokyo Denki University, Professor, 工学部, 教授 (90057232)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOZAKI Hiraku Faculty of Engineering, Tokyo Denki University, Professor, 工学部, 教授 (30130298)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1996: ¥300,000 (Direct Cost: ¥300,000)
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| Keywords | organic phosphite / no-clean type flux / reaction mechanism of flux |
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| Research Abstract |
With fining and elabolating of electronic components, one of problems is decrease of intervales of soldering which loads them on substrate and formation of flux residues. Although residues have been generally removed by CFC cleaning, flux has been changing to low residues or no-clean type one without CFC cleaning since of ozon deplation.
On the pasis of the above background, the study have two objects such as (1) development of flux for no-clean type soldering based on organic phosphites and (2) elucidation of it's mechanism.
(1) A usual flux based on rosin produces flux residues by heat at soldering. So that we adopted organic phosphites as flux base and studied the effects of change of kinds or numbers of organic substituent groups on flux.
In 60 kinds of organic phosphites prepared, didecyl phosphite and di-1-propanol phosphite were confirmed to show the same soldering performance as the low residues type flux on the market and a good possibility of no-clean type flux because residues decrease to 1/10-1/25. On the bases of laboratory level experiments, we have plan to bring it to market under the joint-working of flux makers and applied to the foundation reseach B in the 1997 fiscal year.
(2) By using organic phosphite and copper oxide as a model system of flux action, the reaction mechanism with investigated by change of heat and mass in the reaction.
Organic phosphite is destinguished by two active sites such as hydroxyl group and lone pair of phosphrous and by advanteges of high flux efficiency and the selective reactivity in the small range of temperature. However, it shows disadvantages of decreasing flux effect in the high temperature and being easy of after oxidation of clean base metal.
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