1. Izinto ezisisiseko zeeMveliso kunye neeNzuzo zeMorphological
1.1 Isakhelo seCrystal kunye noLwakhiwo lweMichiza
(I-alumina engqukuva)
I-alumina engqukuva, okanye i-aluminiyam oxide ejikelezileyo (Al ₂ O EZINHLANU), yimveliso eyenziwe ngeceramic eyenziwe ngeceramic ephawulwe ngokuchazwa kakuhle kweglobular morphology kunye nolwakhiwo lwekristale kakhulu kwialpha. (a) isigaba.
Alpha-alumina, enye yezona polymorph zizinzileyo ze-thermodynamically, ibandakanya iplani evaliweyo enehexagonal ye-oxygen ion kunye ne-aluminiyam ion ezihlala kwisibini kwisithathu se-octahedral interstices., okukhokelela kumandla aphezulu e-latticework kunye nokungangeni kweekhemikhali okungaqhelekanga.
Eli nqanaba libonisa uzinzo olukhethekileyo lobushushu, ukugcina ukunyaniseka malunga 1800 °C, kwaye iyaxhathisa impendulo ngeeasidi, iialkali, kunye neentsimbi ezityhidiweyo phantsi kweengxaki ezininzi zoshishino.
Ngokungafaniyo nomgubo we-alumina ongaqhelekanga okanye we-angular ovela kwi-bauxite calcination, I-alumina engqukuva yenziwa ngenkqubo yobushushu obuphezulu obunje ngeplasma spheroidization okanye i-flame synthesis ukufezekisa ukujikeleza okungaguqukiyo kunye nokwakheka komphezulu ogudileyo..
Utshintsho ukusuka kwiibhithi ze-angular precursor– ngokuqhelekileyo calcined bauxite okanye gibbsite– ukuxinana, imijikelezo ye-isotropic isusa amacala abukhali kunye ne-porosity yangaphakathi, ukwandisa ukusebenza kokupakisha kunye nokuqina koomatshini.
Iimpawu zokucoceka okuphezulu (≥ 99.5% Al Zimbini OZINHLANU) zibalulekile kwizicelo ze-elektroniki kunye ne-semiconductor apho ungcoliseko lwe-ionic kufuneka luncitshiswe.
1.2 Ijometri yesuntswana kunye nokuziphatha kokuPakisha
Uphawu oluchazayo lwe-alumina engqukuva kukujikeleza kwayo ngokugqibeleleyo, ivandlakanywa ngokubanzi sisalathiso se-sphericity > 0.9, echaphazela kakhulu ukuhamba kwayo kunye nokupakisha ubukhulu kwiinkqubo ezidibeneyo.
Ngokuchasene namaqhekeza e-angular adibanayo kwaye aphuhlise izithuba, iziqwenga ezingqukuva ziqengqeleka ngaphambi kwenye ngokukhuhlana okusemacaleni, ukuvumela ukulayisha okuqinileyo okuphezulu kuyo yonke ifomula yeemveliso zojongano lomsebenzisi oshushu (Ii-TIMs), i-encapsulants, kunye neekhompawundi zembiza.
Oku kufana kwejometri kuvumela ukuxinana kokupakishwa kwezemfundo okungaphezulu 70 Umthamo, ngaphezulu kwe-50– 60 vol% eqhelekileyo yezizalisi ezingekho mgaqweni.
Ukuzaliswa okuphezulu kokuzalisa ngokuthe tye kufana nokuphucula ukuhanjiswa kwe-thermal kwimatriki yepolymer, njengoko uthungelwano lwe-ceramic rhoqo lubonelela ngeendlela ezithembekileyo zothutho lwephonon.
Ukwengeza, indawo egudileyo yomphezulu inciphisa ukunxiba kwezixhobo zokuphatha kwaye icuthe ukutyeba okutyebileyo ngexesha lokudibanisa, ukuphucula inkqubo kunye nokhuseleko lokusasazwa.
Ubume bemijikelo ye-isotropic ngokufanayo buthintela i-anisotropy exhomekeke kuqhelaniso kwiindawo zokuhlala ezishushu kunye nezomatshini., ukuqinisekisa ukusebenza rhoqo kuwo onke amacala.
2. IiNdlela zokuSebenza kunye noQinisekiso loMgangatho
2.1 Iindlela zeSpheroidization zobushushu obuphezulu
Ukuveliswa kwe-alumina engqukuva ubukhulu becala kuxhomekeke kwiindlela zobushushu ezinyibilikisa amaqhekeza e-alumina e-angular kwaye yenze ukuba uxinzelelo lwendawo yomphezulu luphucule ukuya kuthi ga kwiibhola..
( I-alumina engqukuva)
I-Plasma spheroidization yenye yezona zinto zisetyenziswa kakhulu kubuchule borhwebo, apho umgubo we-alumina utofwa kumlilo weplasma wobushushu obuphezulu (malunga 10,000 K), ibangela ukunyibilika okukhawulezileyo kunye noxinaniso oluqhutywa kwindawo engaphezulu ukuya kuthi ga kwimijikelo egqwesileyo.
Amathontsi anyibilikisiweyo aqina ngokukhawuleza ngexesha lokubhabha, ukutyeba, amasuntswana angeyombobo kunye nokusabalalisa ubungakanani obufanayo xa zidibaniswa nokuhlelwa ngokuchanekileyo.
Iindlela ezahlukeneyo ziquka umlilo we-spheroidization usebenzisa izibane ze-oxy-fuel kunye nokufudumeza okuncediswa yi-microwave., nangona ezi zibonelela nge-output esezantsi okanye ulawulo oluncinci kakhulu kubungakanani bamasuntswana.
Ukucoceka kwemveliso yokuqala kunye nokujikeleza kwe-particle dimension kubalulekile; i-submicron okanye i-micron-scale precursors yenza ngokunjalo iibhola ezinobungakanani emva kokuphathwa.
I-post-synthesis, imveliso yenza ukusefa ngamandla, Ukwahlukana kwe-electrostatic, kunye novavanyo lwe-laser diffraction ukwenza ukuhanjiswa komlinganiselo othile wamasuntswana (PSD), eqhelekileyo ukusuka 1 ukuya 50 µm ngokuxhomekeke kwisicelo.
2.2 Ukuguqulwa koMphezulu kunye nokuSetyenziswa koMsebenzi
Ukuphucula ukuhambelana neematriki eziphilayo ezifana ne-silicones, iipoxies, kunye ne-polyurethanes, I-alumina engqukuva idla ngokunyangwa kumphezulu ngeearhente zokudityaniswa.
Silane coupling agents– njenge-amino, epoxy, okanye iisileni zeplastiki ezisebenzisekayo– yenza iibhondi ezidibeneyo kunye namaqela e-hydroxyl kwindawo yomphezulu we-alumina ngelixa unikezela ukusebenza kwe-organic ebandakanya i-polymer matrix..
Olu nyango luphucula ukunamathela kobuso, yehlisa ukuxhathisa kwe-filler-matrix thermal, kwaye ithintela ukuxubha, kubangela iikhompawundi ezininzi ezifanayo kunye nokusebenza okuphezulu komatshini kunye ne-thermal.
Ukugqityezelwa kwendawo engaphezulu kunokongezwa ngokuyilwa ukubonisa i-hydrophobicity, ukwandisa ukusasazwa kwimathiriyeli engeyiyo ipolar, okanye wenze ukuba kube nokwenzeka kwimikhwa yokuphendula i-stimuli kwizinto ezikrelekrele ze-thermal.
Uqinisekiso lomgangatho lubandakanya imilinganiselo yomgangatho weBET, ubukhulu bempompo, conductivity thermal (ngokwesiqhelo 25– 35 W/(m · K )ngenxa ye-α-alumina engqindilili), kunye neprofayili yokungcola nge-ICP-MS ukuba ingabandakanyi i-Fe, Sele, kunye no K kumanqanaba ppm.
Ukufana kwebhetshi-kwibhetshi kubalulekile kusetyenziso olunokuthembeka okuphezulu kwizinto zombane kunye ne-aerospace.
3. Ukusebenza kweThermal kunye noomatshini kwiiNdibaniselwano
3.1 I-Thermal Conductivity kunye nobuNjineli boMsebenzi woMsebenzi
I-alumina engqukuva ubukhulu becala isetyenziswa njengesizalisi esisebenza ngokuphezulu ukunyusa umgangatho we-thermal conductivity yemathiriyeli esekwe kwipolymer esetyenziswa kwipakethe yemveliso ye-elektroniki., Ukukhanya kwe-LED, kunye neemodyuli zamandla.
Ngelixa i-epoxy ecocekileyo okanye i-silicone ine-thermal conductivity ye ~ 0.2 W/(m · K), ukupakisha nge60– 70 vol% i-alumina engqukuva inokuphucula oku ukuya kwi-2– 5 W/(m · K), ngokwaneleyo ukutshatyalaliswa kokufudumala okusebenzayo kwizixhobo ezidibeneyo.
Umgangatho ophezulu we-thermal conductivity ye-α-alumina, idityaniswe nephonon encinci kakhulu esasazeka kwi-particle-particle-particle kunye ne-particle-matrix interfaces, yenza kube lula ukuhanjiswa kobushushu obuthembekileyo kunye neenethiwekhi ze-percolation.
Ukumelana nobushushu obuphakathi (Kapitza ukumelana) iyaqhubeka ukuba ngumba osikelwa umda, ukanti ukusebenza komphezulu kunye neendlela eziphuculweyo zokusasazwa kunceda ukunciphisa lo mqobo.
Kwiimveliso ze-thermal interface (Ii-TIMs), i-alumina engqukuva yehlisa ukuxhathisa umnxeba phakathi kwamalungu avelisa ubushushu (umz., CPUs, Ii-IGBTs) kunye nobushushu butshona, ukuyeka ukutshisa kakhulu kunye nokwandisa ubomi besixhobo.
I-insulation yayo yombane (ukumelana > 10 ¹² Ω · iisentimitha) iqinisekisa ukhuseleko kunye nokhuseleko kwizicelo eziphezulu ze-voltage, ukuhlula kwiifayili eziqhubayo njengentsimbi okanye igraphite.
3.2 Ukuzinza koomatshini kunye nokuxhomekeka
Ngaphandle kokusebenza kwe-thermal, i-alumina engqukuva iphucula ukomelela koomatshini beekhompawundi ngokwandisa ukuqina, imodyuli, kunye nokuzinza komda.
Ubume obujikelezileyo busasaza uxinzelelo kunye nokuxhalaba ngokulinganayo, ukunciphisa ukuqaliswa kokuqhekeka kunye nokusabalalisa phantsi kwebhayisikile ye-thermal okanye umthwalo womatshini.
Oku kubaluleke kakhulu kwiimveliso ezingagcwaliswanga ngokwaneleyo kunye nezixhobo ezifakwa kwi-flip-chip kunye nezixhobo ezipakishwe nge-3D., apho i-coefficient yophuhliso lwe-thermal (CTE) ukungalingani kunokubangela i-delamination.
Ngokulungisa ukulayishwa kwesihluzi kunye nokuhanjiswa kwesayizi kancinane (umz., imidibaniso ye-bimodal), i-CTE ye-composite inokudityaniswa ukuze ihambelane ne-silicon okanye ibhodi yomama eprintiweyo, ukunciphisa uxinzelelo lwe-thermo-mechanical kunye nokuxhalaba.
Ngaphaya koko, Ukungangeni kwemichiza ye-alumina kuthintela ukuthotywa kwimeko efumileyo okanye enomhlwa, iqinisekisa ukuthembeka okungapheliyo kwi-auto, yorhwebo, kunye ne-elektroniki yangaphandle.
4. Izicelo kunye ne-Technical Evolution
4.1 Izixhobo zombane kunye neZisombululo zeMoto yoMbane
I-alumina ejikelezayo yinto ebalulekileyo ekulawuleni i-thermal ye-elektroniki yamandla aphezulu, kuquka isango elikhuselweyo i-bipolar transistors (Ii-IGBTs), izixhobo zombane, kunye neenkqubo zolawulo lwebhetri kwiilori zombane (Ii-EVs).
Kwi-EV imithwalo yebhetri, idityaniswe kwizinto zokubumba kunye neemveliso zokutshintsha iqonga ukunqanda ukubaleka kwe-thermal ngokusabalalisa ngokulinganayo ubushushu kuzo zonke iiseli..
Abenzi be-LED bayisebenzisa kwii-encapsulants kunye ne-optics yesibini ukugcina umphumo we-lumen kunye nokufana komthunzi ngokunciphisa ubushushu obuhlangeneyo..
Kwisakhelo se-5G kunye nezibonelelo zolwazi, apho uxinezeleko olushushu lunyukayo, Ii-TIM ezingqukuva ezigcwele i-alumina zenza inkqubo ethile ezinzileyo yeetshiphusi ezihamba rhoqo kunye ne-laser diode..
Umsebenzi wayo uyakhula ube yitekhnoloji yokupakisha imveliso efana ne-fan-out wafer-level packaging. (I-FOWLP) kunye neenkqubo zokufa ezizinzisiweyo.
4.2 Imida ekhulayo kunye noPhuhliso oluZinzileyo
Ukukhula kwexesha elizayo kugxile kwiinkqubo zokuzalisa ezixubeneyo ezidibanisa i-alumina engqukuva kunye ne-boron nitride, i-aluminiyam nitride, okanye igraphene ukufezekisa ukusebenzisana kwe-thermal ngelixa ugcina ukugquma kombane.
Nano-spherical alumina (ngaphantsi kwe-100 nm) kuphononongwa iiseramikhi ezicacileyo, Izigqubuthelo zeUV, kunye nezicelo ze-biomedical, nangona imiqobo ekusasazeni kunye neendleko zokuhlala.
Imveliso eyongezelelweyo ye-thermal conductive polymer composites esebenzisa i-alumina engqukuva ivumela ubunzima., i-topology-optimised ubushushu besakhelo sokuchitha.
Iinzame zokuzinza ziquka iinkqubo zokusebenzisa amandla e-spheroidization, ukurisayikilishwa kwemathiriyeli engeyodwa, kunye nohlalutyo lomjikelezo wobomi ukunciphisa impembelelo yekhabhoni yezinto eziphezulu zokusebenza kwe-thermal.
Isishwankathelo, ialumina engqukuva imele into ebalulekileyo eyenziweyo ekudibaneni kweeporcelains, iikhompawundi, kunye nesayensi ye-thermal.
Indibaniselwano yayo ekhethekileyo ye-morphology, ubunyulu, kunye nokusebenza kuyenza ibaluleke kwiminiaturization eqhubekayo kunye nokwanda kwamandla edijithali kunye neenkqubo zamandla zangoku.
5. Umboneleli
I-TRUNANO ngumvelisi we-aluminium owaziwayo kwihlabathi jikelele kunye nomthengisi weekhompawundi ezingaphezulu 12 iminyaka yobungcali kumgangatho ophezulu we-nanomaterials kunye nezinye iikhemikhali. Inkampani iphuhlisa izinto ezahlukeneyo zomgubo kunye neekhemikhali. Ukubonelela ngenkonzo ye-OEM. Ukuba ufuna umgangatho ophezulu we-Spherical alumina, nceda uzive ukhululekile ukuqhagamshelana nathi. Unokucofa kwimveliso ukuze uqhagamshelane nathi.
Iithegi: I-alumina engqukuva, ialumina, i-aluminium oxide
Onke amanqaku kunye nemifanekiso avela kwi-Intanethi. Ukuba kukho nayiphi na imiba ye-copyright, nceda uqhagamshelane nathi ngexesha lokucima.
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