纖維結(jié)構(gòu)wcu觸頭材料制備工藝及性能的研究

1、≮’8‘1509分類號西安建筑科技大學(xué)學(xué)位論文纖維結(jié)構(gòu)W／Cu肚頭材料制備工藝廈性能的研究作者三些苧指導(dǎo)教師姓名許云華教授申請學(xué)位級別塑：主專業(yè)論文提交日期!旦竺墜!!名稱巡論文答辯日期!旦墮：!!學(xué)位授予單位魚壘建塹翌墊叁鱟答辯委員會主席一評閱人西安建筑科技大學(xué)碩士論文ManufacturingandPreparationtechniquesandpropertystudyoffiberstructuredW／Cucontactmat

2、erialsMajor：MaterialMaster：WangLinm1_1tor：ProfXuYunhuaAbstractBeingapseudotwo—phasealloycomposedofCuandWelements，W／Cucompositeshavenotonlyhi曲meltingpoint，hi出densitylowthermalcoefficientofexpansionandhighstrength，butalsob

3、etterelectricconduction，beuerheatconductionandplasticityunderroomtemperatureThusW／CucompositesareappliedextensivelyaselectricalcontactmaterialsandelectrodematedalsInthelate1980s，W／Cualloywasusedwidely，suchascontactmateri

4、alsofvacuumcircuitbreakersubstratesoflarge—scaleIC(integratecircuit)andhighpowermicrowaveapparatus，sealandpackagematerialsandjointpartsandradiatorapparatusItisrequiredthatW／Cucompositeswhichareused船contactmaterialsofvacu

5、umcircuitbreakerandelectronappliancesshouldpossessthepmpertiesofhigh—densitylowgas—leaking，betterelectricconductionandheatconduction晡，llileconventionalW／CUalloyaremanufacturedinthepowermetallurgytechniquewhichrequirehigh

6、qualityoftungstenpowerandcopperpowerAsforthepresenttechnology，theproducedtungstenpowerandcopperpowercontainhiighamountofgas，whichlimitelectricalcontactperformanceForexample，thedensityofcontactmaterialsisquitelow(Becausec

7、ontactmaterialsmanufacturedinpowermetallurgytechniqueareeasilyinflatableduringthecourseofsinteringyetitisdifficulttosinterdenselyThebestdensityCanattain92％～95％)，thegascontentishi曲，andelectricalandthermalconductivityislow

8、Inordertoovercomedisfigurementofconventionaltechniquesandmeettherequirementforcontactmaterialsofvacuumcircuitbreakerandmicro—electronindustry，OurscientificgroupresearchanddevelopakindofnewpreparationtechniqueofW／Cucompos