speednano

NanodiamondsP3.
32193Highthermalconductivitydiamond-coppercompositesShakhovF.
M.
1,KidalovS.
V.
1*,AbyzovA.
M.
21IoffePhysical-TechnicalInstitute,194021,Saint-Petersburg,Russia2Saint-PetersburgStateInstituteofTechnology,190013,Saint-Petersburg,Russia*e-mail:kidalov@mail.
ioffe.
ruAcompositematerialwithhighthermalconductivityof600-900W/(mK),aswellasaprocessforfabricatingacompositematerialisdeveloped[1].
Diamond-coppercompositesareobtainedfrommonodispersefillershavingthefollowingcharacteristics:-thermalconductivityisupto800-900W/(m*K)fordiamondparticlesof200-400mkmsize;-diamondvolumefraction~62%;-compositedensity~5,5g/cm3;-coefficientofthermalexpansion5ppm/Kat20qCand8ppm/Kat200qC;-longitudinalspeedofsound~9km/s;-Youngmodulus~300GPa;-specificelectricalresistivity5-10mkcm.
Forcomparison,thethermalconductivityofcopperis390W/(mK).
Inregardtotheircharacteristicstheobtainedmaterialsdonotinferiortoorsuperiorthediamond-metalcompositesfabricatedbyallotherknownmeans(pressure-assistedinfiltrationofcopperalloyscontainingcarbide-formingadditives;sinteringwithcopperorinfiltrationathighpressuresmorethan1GPa).
Thediamond-coppercompositematerialismadebyamethodofcapillary(spontaneous)infiltrationofcoppermeltinabedofdiamondparticleswithpreliminaryappliedcoatingofcarbide-formingmetal.
Thecoatingthicknessisabout100-300nm.
Rawmaterialsareavailable(powdersofsyntheticdiamondandcopper,alloysarenotused).
Theinfiltrationiscarriedduringshorttime(severalminutes)andtheprocesshasalmostnorestrictionsastotheformandsizesofproductitems.
Theproductscanbemanufacturedinfinalorclosetothefinalformandcanhavecavities,ledgesandthroughaperturesinthem.
Theproductmaterialcanbeeasilyjointedtootherconstructiveelementsbymeansofsoldering.
Theproposedcompositematerialcanbeusedinheatexchangers,heatsinks,heatspreadersforsemiconductorandvacuumelectronicdevices,inhigh-heat-fluxsystems,forexample,insynchrotronradiationsources,elementaryparticlesacceleratorsandnuclearfusionreactors,etc.
ThisstudywassupportedbytheRFBRgrant09-08-01200-andbytheMinistryofEducationandScienceoftheRussianFederationontract16.
740.
11.
0216.
[1]A.
M.
Abyzov,S.
V.
Kidalov,F.
M.
Shakhov.
J.
Mater.
Sci.
46,1424(2011).