M'zaka zaposachedwapa, matenthedwe conductivity wa mankhwala mphira walandira chidwi kwambiri.Zopangira mphira wa Thermally conductive zimagwiritsidwa ntchito kwambiri pazamlengalenga, ndege, zamagetsi, ndi zida zamagetsi kuti zithandizire pakuwongolera kutentha, kutsekemera komanso kuyamwa modzidzimutsa.Kusintha kwa matenthedwe matenthedwe ndikofunikira kwambiri pazinthu zopangira mphira zamafuta.Zopangidwa ndi mphira zokonzedwa ndi chotenthetsera chotenthetsera zimatha kusamutsa kutentha, komwe kuli kofunikira kwambiri pakuchulukira ndi miniaturization yazinthu zamagetsi, komanso kuwongolera kudalirika kwawo komanso kukulitsa moyo wawo wautumiki.
Pakalipano, zipangizo za mphira zomwe zimagwiritsidwa ntchito m'matayala ziyenera kukhala ndi makhalidwe a kutentha kochepa komanso kutentha kwapamwamba.Kumbali imodzi, mu ndondomeko ya vulcanization ya matayala, kutentha kwa mphira kumapangidwa bwino, kuchuluka kwa vulcanization kumawonjezeka, ndipo kugwiritsira ntchito mphamvu kumachepetsedwa;Kutentha komwe kumapangidwa poyendetsa galimoto kumachepetsa kutentha kwa nyama komanso kumachepetsa kuwonongeka kwa matayala chifukwa cha kutentha kwambiri.Thermal conductivity of thermally conductive rabara imayang'aniridwa makamaka ndi matrix a rabara ndi chodzaza chodzaza ndi thermally conductive.Thermal conductivity of the particles kapena fibrous thermal conductive filler ndiabwino kwambiri kuposa matrix a mphira.
Zomwe zimagwiritsidwa ntchito kwambiri ndi thermally conductive fillers ndi izi:
1. Cubic Beta gawo nano silicon carbide (SiC)
Nano-scale silikoni carbide ufa umapanga kukhudzana kutentha conduction unyolo, ndipo n'zosavuta nthambi ndi ma polima, kupanga Si-O-Si unyolo kutentha conduction mafupa monga waukulu kutentha conduction njira, amene kwambiri bwino matenthedwe madutsidwe wa zinthu gulu popanda kuchepetsa Composite material The makina katundu.
The matenthedwe madutsidwe wa silicon carbide epoxy gulu zinthu kumawonjezeka ndi kuwonjezeka kuchuluka kwa pakachitsulo carbide, ndi nano-silicon carbide angapereke gulu zinthu zabwino matenthedwe madutsidwe pamene kuchuluka ndi otsika.Mphamvu yosunthika ndi mphamvu ya silicon carbide epoxy composite zida zimawonjezeka poyamba ndiyeno zimachepa ndi kuchuluka kwa silicon carbide.Kusintha kwapamtunda kwa silicon carbide kumatha kupititsa patsogolo matenthedwe amafuta ndi makina azinthu zophatikizika.
Silicon carbide imakhala ndi zinthu zokhazikika zamakemikolo, matenthedwe ake amatenthetsa bwino kuposa ma semiconductor fillers ena, ndipo matenthedwe ake amatenthetsa kwambiri kuposa chitsulo kutentha kwachipinda.Ofufuza ochokera ku yunivesite ya Beijing ya Chemical Technology adachita kafukufuku wokhudzana ndi kutentha kwa alumina ndi silicon carbide yolimbitsa mphira wa silicone.Zotsatira zikuwonetsa kuti matenthedwe a mphira wa silikoni akuwonjezeka pamene kuchuluka kwa silicon carbide kumawonjezeka;pamene kuchuluka kwa pakachitsulo carbide ndi yemweyo, ndi matenthedwe madutsidwe wa yaing'ono tinthu kukula pakachitsulo carbide analimbitsa silikoni mphira ndi wamkulu kuposa tinthu kukula pakachitsulo carbide analimbitsa silikoni mphira;Kutentha kwa mphira wa silicon wolimbikitsidwa ndi silicon carbide ndikwabwino kuposa mphira wa aluminiyamu wolimbikitsidwa wa silicon.Pamene chiŵerengero cha misa cha alumina / silicon carbide ndi 8/2 ndipo chiwerengero chonse ndi magawo 600, matenthedwe a mphira wa silicon ndiye abwino kwambiri.
Aluminium nitride ndi kristalo wa atomiki ndipo ndi wa diamondi nitride.Ikhoza kukhalapo mokhazikika pa kutentha kwakukulu kwa 2200 ℃.Imakhala ndi ma conductivity abwino amafuta komanso kuchuluka kwamafuta ochepa, zomwe zimapangitsa kuti ikhale yabwino kwambiri yotenthetsera kutentha.Thermal conductivity ya aluminium nitride ndi 320 W · (m·K) -1, yomwe ili pafupi ndi matenthedwe a boron oxide ndi silicon carbide, ndipo ndi yaikulu kuwirikiza kasanu kuposa ya aluminiyamu.Ofufuza ochokera ku Qingdao University of Science and Technology aphunzira momwe matenthedwe amatenthedwe a aluminiyamu nitride omwe amalimbitsa mphira wa EPDM.Zotsatira zimasonyeza kuti: pamene kuchuluka kwa aluminium nitride kumawonjezeka, kutentha kwa matenthedwe azinthu zowonjezera kumawonjezeka;The matenthedwe madutsidwe wa zinthu kompositi popanda aluminium nitride ndi 0.26 W · (m·K) -1, pamene kuchuluka kwa aluminium nitride kumawonjezeka Pa 80 mbali, matenthedwe madutsidwe wa zinthu gulu kufika 0.442 W · (m·K) -1, kuwonjezeka kwa 70%.
Alumina ndi mtundu wa multifunctional inorganic filler, yomwe imakhala ndi matenthedwe akulu, ma dielectric osasunthika komanso kukana kuvala bwino.Amagwiritsidwa ntchito kwambiri pazinthu zamagulu a mphira.
Ofufuza ochokera ku yunivesite ya Beijing ya Chemical Technology adayesa kutentha kwa nano-alumina/carbon nanotube/natural mphira composites.Zotsatira zikuwonetsa kuti kuphatikizika kwa nano-aluminium ndi carbon nanotubes kumakhudzanso kuwongolera kutentha kwazinthu zophatikizika;pamene kuchuluka kwa carbon nanotubes kumakhala kosalekeza, kutentha kwa matenthedwe kwa zinthu zophatikizika kumawonjezeka mofanana ndi kuwonjezeka kwa kuchuluka kwa nano-alumina;pamene 100 Mukamagwiritsa ntchito nano-aluminium monga chopangira chotenthetsera chotenthetsera, matenthedwe azinthu zamagulu amawonjezeka ndi 120%.Pamene 5 mbali za carbon nanotubes ntchito monga thermally conductive filler, matenthedwe madutsidwe wa zinthu gulu kumawonjezeka ndi 23%.Pamene magawo 100 a aluminiyamu ndi magawo asanu amagwiritsidwa ntchito Pamene ma carbon nanotubes amagwiritsidwa ntchito ngati chodzaza mafuta opangira matenthedwe, matenthedwe amtundu wa zinthu zophatikizika amawonjezeka ndi 155%.Kuyeserako kumaperekanso mfundo ziwiri zotsatirazi: Choyamba, pamene kuchuluka kwa carbon nanotubes kumakhala kosalekeza, pamene kuchuluka kwa nano-aluminium kumawonjezeka, mawonekedwe a netiweki opangidwa ndi ma conductive filler particles mu rabara amawonjezeka pang'onopang'ono, ndipo kutaya kwa kompositi zimawonjezeka pang'onopang'ono.Pamene magawo 100 a nano-alumina ndi magawo atatu a carbon nanotubes amagwiritsidwa ntchito palimodzi, kutentha kwa kutentha kwa zinthu zophatikizika kumangokhala 12 ℃, ndipo mphamvu zamakina zimakhala zabwino kwambiri;chachiwiri, pamene kuchuluka kwa carbon nanotubes atakhazikika, monga kuchuluka kwa nano-alumina ukuwonjezeka, The kuuma ndi kung'ambika mphamvu ya zipangizo gulu kuwonjezeka, pamene kumakokedwa mphamvu ndi elongation pa yopuma kuchepa.
Ma Carbon nanotubes ali ndi mawonekedwe abwino kwambiri akuthupi, matenthedwe amafuta ndi ma conductivity amagetsi, ndipo ndi oyenera kulimbikitsa zodzaza.Zida zawo zophatikizira mphira zalandira chidwi chofala.Mpweya nanotubes amapangidwa ndi kupindika zigawo za graphite mapepala.Iwo ndi mtundu watsopano wa zinthu graphite ndi dongosolo cylindrical ndi awiri a makumi nanometers (10-30nm, 30-60nm, 60-100nm).Thermal conductivity ya carbon nanotubes ndi 3000 W · (m·K) -1, yomwe ili kasanu kuposa momwe matenthedwe amatenthetsa amkuwa.Ma carbon nanotubes amatha kusintha kwambiri matenthedwe matenthedwe, mphamvu zamagetsi ndi mawonekedwe a raba, ndipo kulimbitsa kwawo ndi kutenthetsa kwawo kuli bwino kuposa zodzaza zachikhalidwe monga kaboni wakuda, kaboni fiber ndi galasi fiber.Ofufuza ochokera ku yunivesite ya Qingdao ya Sayansi ndi Ukadaulo adachita kafukufuku wokhudza matenthedwe amtundu wa carbon nanotubes/EPDM.Zotsatira zikuwonetsa kuti: ma carbon nanotubes amatha kusintha matenthedwe amafuta ndi zinthu zakuthupi zazinthu zophatikizika;pamene kuchuluka kwa carbon nanotubes kumawonjezeka, matenthedwe matenthedwe a zinthu zophatikizika amawonjezeka, ndipo mphamvu zamakokedwe ndi elongation pa nthawi yopuma zimawonjezeka ndiyeno zimachepa, Kupanikizika kwamphamvu ndi kugwetsa mphamvu kumawonjezeka;pamene kuchuluka kwa carbon nanotubes kuli kochepa, ma carbon nanotubes okhala ndi m'mimba mwake ndi osavuta kupanga maunyolo oyendetsa kutentha kusiyana ndi ma carbon nanotubes ang'onoang'ono, ndipo amaphatikizidwa bwino ndi matrix a rabara.
Nthawi yotumiza: Aug-30-2021