Mumakore achangopfuura, thermal conductivity yezvigadzirwa zverubha yakagamuchira kutariswa kwakanyanya.Thermally conductive rubber zvigadzirwa zvinoshandiswa zvakanyanya muminda yeaerospace, avhiyesheni, zvemagetsi, uye midziyo yemagetsi kuita basa mukupisa conduction, insulation uye kuvhunduka kutorwa.Iko kuvandudzwa kweiyo thermal conductivity kwakakosha zvakanyanya kune thermally conductive rubber zvigadzirwa.Iyo rabha inoumbwa zvinhu inogadzirwa ne thermally conductive filler inogona kunyatso fambisa kupisa, iyo yakakosha zvikuru kune densification uye miniaturization yezvigadzirwa zvemagetsi, pamwe nekuvandudzwa kwekuvimbika kwavo uye kuwedzera kwehupenyu hwavo hwesevhisi.
Parizvino, zvigadzirwa zverubha zvinoshandiswa mumatairi zvinoda kuve nehunhu hwekudzika kupisa chizvarwa uye yakakwirira yekupisa conductivity.Kune rumwe rutivi, muhutano hwevhiri vulcanization, kushandiswa kwekushisa kwerubha kunovandudzwa, chiyero chevulcanization chinowedzera, uye kushandiswa kwesimba kunoderedzwa;Kupisa kunogadzirwa panguva yekutyaira kunoderedza kudziya kwechitunha uye kunoderedza kuderera kwekuita kwetai kunokonzerwa nekupisa kwakanyanya.Iyo yekupisa conductivity ye thermally conductive rubber inonyanya kutsanangurwa nerubha matrix uye thermally conductive filler.Thermal conductivity yezvimwe zvimedu kana fibrous thermal conductive filler iri nani kupfuura iyo yerubha matrix.
Iwo anonyanya kushandiswa thermally conductive fillers ndeaya anotevera zvinhu:
1. Cubic Beta chikamu nano silicon carbide (SiC)
Nano-scale silicon carbide poda inoumba inosangana nekupisa conduction cheni, uye iri nyore kuita bazi nemapolymers, kugadzira Si-O-Si cheni yekupisa conduction skeleton senzira huru yekupisa yekupisa, iyo inovandudza zvakanyanya kupisa kwekupisa kwezvinhu zvinoumbwa pasina kudzikisa composite material The mechanical properties.
Thermal conductivity yesilicon carbide epoxy composite material inowedzera nekuwedzera kwehuwandu hwesilicon carbide, uye nano-silicon carbide inogona kupa iyo composite zvinhu zvakanaka kupisa kwekushisa kana huwandu hwakaderera.Simba rekushanduka-shanduka uye simba rekuita resilicon carbide epoxy composite zvinhu zvinowedzera kutanga uye zvino kuderera nekuwedzera kwehuwandu hwesilicon carbide.Iko kugadziridzwa kwepamusoro kwesilicon carbide kunogona kunyatso kuvandudza iyo yekupisa conductivity uye mechanic zvimiro zvezvakaumbwa zvinhu.
Silicon carbide ine yakagadzika makemikari zvimiro, kudziya kwayo kupisa kuri nani pane mamwe semiconductor mafirita, uye kudziya kwayo kunotyisa kwakatokura kupfuura iyo yesimbi pakamuri tembiricha.Vatsvagiri kubva kuBeijing University yeChemical Technology vakaita tsvagiridzo pamusoro pekupisa kwealumina uye silicon carbide yakasimbisa silicone rabha.Mhedzisiro yacho inoratidza kuti thermal conductivity yesilicone rubber inowedzera sezvo huwandu hwesilicon carbide hunowedzera;kana huwandu hwesilicon carbide hwakafanana, kupisa kwemafuta kweiyo diki particle size silicon carbide reinforced silicone rubber yakakura kupfuura iyo yakakura particle size silicon carbide reinforced silicone rubber;Iyo yekupisa conductivity yesilicon rabha yakasimbiswa nesilicon carbide iri nani pane iyo yealumina yakasimbiswa silicon rabha.Kana huwandu hwehuwandu hwealumina/silicon carbide iri 8/2 uye huwandu hwese huri 600 zvikamu, iyo yekupisa conductivity yesilicon rabha ndiyo yakanyanya kunaka.
Aluminium nitride ikristaro yeatomu uye ndeye diamond nitride.Inogona kuvapo yakadzikama pakupisa kwepamusoro kwe2200 ℃.Iyo ine yakanaka yekupisa conductivity uye yakaderera thermal yekuwedzera coefficient, zvichiita kuti ive yakanaka yekupisa kuvhundutsa zvinhu.Thermal conductivity of aluminium nitride is 320 W · (m·K)-1, iri pedyo ne thermal conductivity ye boron oxide nesilicon carbide, uye yakakura kudarika ka5 pane iyo alumina.Vatsvagiri kubva kuQingdao University yeSainzi neTekinoroji vakadzidza kupisa kwekupisa kwealuminum nitride yakasimbisa EPDM rubber composite.Zvigumisiro zvinoratidza kuti: sezvo huwandu hwealuminium nitride hunowedzera, kupisa kwekushisa kwezvinhu zvinosanganiswa kunowedzera;thermal conductivity yezvinhu zvakasanganiswa pasina aluminium nitride ndeye 0.26 W · (m·K) -1, kana huwandu hwealuminium nitride huchiwedzera kusvika Pazvikamu makumi masere, kupisa kwekushisa kwezvinhu zvinosanganiswa kunosvika 0.442 W · (m·K) -1, kuwedzera kwe70%.
Alumina rudzi rwe multifunctional inorganic filler, ine yakakura yekupisa conductivity, dielectric inogara uye yakanaka kupfeka kuramba.Inoshandiswa zvakanyanya murubber composite zvinhu.
Vatsvagiri kubva kuBeijing University yeChemical Technology vakaedza kupisa kwekupisa kwe nano-alumina/carbon nanotube/natural rubber composite.Zvigumisiro zvinoratidza kuti kushandiswa kwakasanganiswa kwe nano-alumina uye kabhoni nanotubes kune synergistic effect pakuvandudza kupisa kwekushisa kwezvinhu zvinosanganiswa;apo huwandu hwekabhoni nanotubes hunogara huripo, kupisa kwekushisa kwezvinhu zvakasanganiswa kunowedzera mutsara nekuwedzera kwehuwandu hwenano-alumina;apo 100 Paunenge uchishandisa nano-alumina seyo thermally conductive filler, thermal conductivity yezvakagadzirwa zvinhu zvinowedzera ne120%.Kana zvikamu zvishanu zvekabhoni nanotubes zvichishandiswa senge thermally conductive filler, thermal conductivity yecomposite material inowedzera ne23%.Kana 100 zvikamu zvealumina uye zvikamu zvishanu zvichishandiswa Kana kabhoni nanotubes inoshandiswa se thermally conductive filler, thermal conductivity yezvakasanganiswa zvinhu zvinowedzera ne155%.Chiyedzo ichi chinokweverawo mhedziso mbiri dzinotevera: Chekutanga, kana huwandu hwekabhoni nanotubes huchienderera, sezvo huwandu hwenano-alumina huchiwedzera, iyo yekuzadza network chimiro inoumbwa neanoita conductive kuzadza zvidimbu murabha zvishoma nezvishoma, uye kurasikirwa kweiyo. composite zvinhu zvinowedzera zvishoma nezvishoma.Kana 100 zvikamu zve nano-alumina uye 3 zvikamu zvekabhoni nanotubes zvichishandiswa pamwechete, iyo ine simba yekumanikidza kupisa chizvarwa cheiyo inoumbwa zvinhu inongova 12 ℃, uye dhizaini michini yezvivakwa zvakanaka;chechipiri, kana huwandu hwekabhoni nanotubes hwakagadziriswa, sezvo huwandu hwenano-alumina hunowedzera, Kuoma uye kubvarura kusimba kwezvinhu zvinosanganiswa kunowedzera, nepo kusimba kwesimba uye kureba panguva yekuzorora kunoderera.
Carbon nanotubes ine yakanakisa yemuviri zvimiro, yekupisa conductivity uye magetsi conductivity, uye akakodzera ekusimbisa mafirita.Yavo yekusimbisa rabha inoumbwa zvinhu zvakagamuchira kutariswa kwakapararira.Carbon nanotubes inoumbwa nekupeta zvidimbu zvegraphite sheet.Iwo rudzi rutsva rwema graphite zvinhu zvine cylindrical chimiro chine dhayamita yemakumi ema nanometers (10-30nm, 30-60nm, 60-100nm).Thermal conductivity of carbon nanotubes is 3000 W · (m·K)-1, inova ka5 pane thermal conductivity yemhangura.Carbon nanotubes inogona kuvandudza zvakanyanya thermal conductivity, magetsi ekufambisa uye emuviri zvimiro zverabha, uye kusimbaradza kwavo uye kupisa conductivity kuri nani pane echinyakare mafirita senge kabhoni dema, kabhoni fiber uye girazi fiber.Vatsvagiri kubva kuQingdao University yeScience neTekinoroji vakaita tsvakiridzo pamusoro pekupisa kwekupisa kwekabhoni nanotubes/EPDM inoumbwa zvinhu.Mhedzisiro yacho inoratidza kuti: kabhoni nanotubes inogona kuvandudza thermal conductivity uye zvemuviri zvimiro zvezvakasanganiswa zvinhu;sezvo huwandu hwekabhoni nanotubes hunowedzera, iyo yekupisa conductivity yezvinhu zvinosanganiswa inowedzera, uye simba rekusimba uye kureba panguva yekuzorora kwekutanga kunowedzera uyezve kuderera, Kushushikana kwekunetseka uye kubvarura simba kunowedzera;kana huwandu hwekabhoni nanotubes hudiki, hombe-dhayamita kabhoni nanotubes zviri nyore kugadzira cheni dzinopisa kupisa pane diki-diameter kabhoni nanotubes, uye zviri nani zvakabatanidzwa nerubber matrix.
Nguva yekutumira: Aug-30-2021