Vacuum heated electroless nickel plated contacts

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dc.contributor.author Dervos, CT en
dc.contributor.author Vassiliou, P en
dc.contributor.author Novacovich, J en
dc.contributor.author Kollia, C en
dc.date.accessioned 2014-03-01T01:21:41Z
dc.date.available 2014-03-01T01:21:41Z
dc.date.issued 2004 en
dc.identifier.issn 1521-3331 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/16312
dc.subject Connector materials en
dc.subject Corrosion resistance en
dc.subject Electrical contacts en
dc.subject Electroless nickel en
dc.subject High microhardness coatings en
dc.subject Vacuum heat-treated en
dc.subject.classification Engineering, Manufacturing en
dc.subject.classification Engineering, Electrical & Electronic en
dc.subject.classification Materials Science, Multidisciplinary en
dc.subject.other Corrosion resistance en
dc.subject.other Electroless plating en
dc.subject.other Hardness en
dc.subject.other Heat treatment en
dc.subject.other Nickel en
dc.subject.other Scanning electron microscopy en
dc.subject.other X ray diffraction analysis en
dc.subject.other Electrical contacts en
dc.subject.other Electroless nickel en
dc.subject.other High microhardness coatings en
dc.subject.other Electronics packaging en
dc.title Vacuum heated electroless nickel plated contacts en
heal.type journalArticle en
heal.identifier.primary 10.1109/TCAPT.2004.825775 en
heal.identifier.secondary http://dx.doi.org/10.1109/TCAPT.2004.825775 en
heal.language English en
heal.publicationDate 2004 en
heal.abstract Electroless nickel plating has been tried on steel or brass substrates. By selected conditions of heat treatment in a high vacuum environment the plating can produce chromium equivalent hardness without the effluents of the hard chromium plating process. The resulting surfaces were examined and characterized under an optical and a scanning electron microscope. X-ray diffraction analysis was also performed to investigate recrystallization effects. The fabricated contact materials were also tested under corrosion conditions and linear polarization measurements were performed. To exploit possible utilization of produced coatings as electrical contact or connector materials, semispherical nickel plated steel joints were tested under the simultaneous application of mechanical fretting and a low-voltage electrical load. Their contact resistance was monitored during 20,000 cycle tests. The results show that after a 2-min heat treatment under 800 degreesC in a high vacuum environment, the plating acquires a crystalline structure with microhardness exceeding 1100 HV and a very good adhesion to the substrate material, without deteriorating its corrosion wear properties. In addition they exhibit a low and stable electrical contact resistance when operating in adverse environments i.e. fretting conditions or corrosive atmosphere. en
heal.journalName IEEE Transactions on Components and Packaging Technologies en
dc.identifier.doi 10.1109/TCAPT.2004.825775 en
dc.identifier.isi ISI:000221005300019 en
dc.identifier.volume 27 en
dc.identifier.issue 1 en
dc.identifier.spage 131 en
dc.identifier.epage 137 en

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