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Title Ion chromatography in the manufacture of multilayer circuit boards
Creator/Author Smith, R.E.
Publication Date1990 Jan 01
OSTI IdentifierOSTI ID: 5109966; DE90005560
Report Number(s)KCP-613-4247;CONF-900159--1
DOE Contract NumberAC04-76DP00613
Resource TypeConference
Specific TypeTechnical Report
Resource RelationIon chromatography in the semiconductor, electronics and plating industries; 16 Jan 1990; San Jose, CA (USA); DOE Project
Research OrgAllied-Signal Aerospace Co., Kansas City, MO (USA). Kansas City Div.
Sponsoring OrgDOE/DP
Subject426000 -- Engineering-- Components, Electron Devices & Circuits-- (1990-) ;400105 -- Separation Procedures; PRINTED CIRCUITS-- PROCESS SOLUTIONS;PROCESS SOLUTIONS-- CHROMATOGRAPHY; AMMONIUM FLUORIDES;ANIONS;CHROMIC ACID;COPPER;PROCESSING;TRANSITION ELEMENTS
Related SubjectAMMONIUM COMPOUNDS;CHARGED PARTICLES;CHROMIUM COMPOUNDS;DISPERSIONS;ELECTRONIC CIRCUITS;ELEMENTS;FLUORIDES;FLUORINE COMPOUNDS;HALIDES;HALOGEN COMPOUNDS;HYDROGEN COMPOUNDS;INORGANIC ACIDS;IONS;METALS;MIXTURES;OXYGEN COMPOUNDS;SEPARATION PROCESSES;SOLUTIONS;TRANSITION ELEMENT COMPOUNDS;TRANSITION ELEMENTS
Description/Abstract Ion chromatography (IC) has proven useful in analyzing chemical solutions used in the manufacture of multilayer circuit boards.^Unlike other chemical quantification techniques, IC provides results on ions not expected in the production solutions.^Thus, solution contamination and break-down products can be monitored in every phase of the circuit board manufacturing.^During the first phase, epoxy laminates experience an etchback, first in chromic acid, which can be analyzed for trace chloride and sulfate, then in ammonium bifluoride/HCl, which can be analyzed for fluoride and chloride.^Following a wet-blasting to roughen up the surface, 20 microinches of copper are deposited using an electroless bath.^Again, IC is applicable for monitoring formate, tartarate, and sulfate levels.^Next, an acid copper bath is used to electroplate the through holes with 0.001 inches of ductile copper.^This bath is analyzed for trace chloride.^Photoimaging is then performed, and the organic solvents used can be assayed for trace ionic chloride.^Finally, a fluoroboric acid-based tin-lead bath is used to deposit a solderable alloy.^This bath is analyzed for fluoroborate, tin, and lead.^In addition, mobile phase ion chromatography (MPIC) is used to monitor the nonionic organic brighteners in the baths.^11 refs., 7 figs.
Country of PublicationUnited States
LanguageEnglish
FormatPages: (16 p)
AvailabilityNTIS, PC A03/MF A01 - OSTI; GPO Dep.
System Entry Date2001 May 13

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