Vacuum heated electroless nickel plated contacts

Dervos, CT; Vassiliou, P; Novacovich, J; Kollia, C

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.publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC	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