U-Alumina onomsindo (I-Aluminiyam oxide): I-Nanoscale Architecture kunye ne-Multifunctional Application ye-High-Surface-Area yeCeramic Material ye-Gamma alumina powder

1. Ukudibanisa, Isakhelo, kunye neMiba eBalulekileyo yeAlumina eFumed

1.1 INkqubo yeMveliso kunye noLwakhiwo lweSigaba seAerosol

(U-Alumina onomsindo)

I-alumina evuthayo, ikwabizwa ngokuba yi-pyrogenic alumina, bubunyulu obuphezulu, ifom ye-nanostructured yobunzima bokukhanya kwe-aluminium oxide (Al ₂ O AMATHANDATHU) idalwe ngenkqubo yokwenziwa kwesigaba sobushushu sobushushu obuphezulu.

Ngokungafaniyo nesiqhelo calcined okanye aluminas precipitated, i-alumina evuthayo yenziwa kwi-reactor yomlilo apho i-aluminiyam-equlethe izandulela– Ngokuqhelekileyo ubunzima be-aluminiyam chloride (AlCl ezine) okanye izinto ze-organoaluminum– zibaswe kwidangatye le-hydrogen-oksijeni kumaqondo obushushu angaphaya 1500 °C.

Kulo moya unzima, I-precursor iyajika kwaye ingene kwi-hydrolysis okanye i-oxidation ukwenza umphunga wobunzima obunzima be-aluminium oxide, ethi ngokukhawuleza ifake iinuclear ngqo kwii-nanoparticles ezingundoqo njengoko igesi iphola.

La masuntswana aqalayo ayangqubana aze adibanise kunye kwinqanaba legesi, ukwenza uqokelelo olufana nekhonkco olubanjwe omnye komnye ngamabhondi aqinileyo aqinileyo, ekhokelela kwindawo enemingxuma ephezulu, ubume bothungelwano olunamacala amathathu.

Yonke le nkqubo yenzeka kumbandela wee-milliseconds, ukuvelisa isohlwayo, umgubo ococekileyo kunye nobunyulu obukhethekileyo (rhoqo > 99.8% Al ₂ O EZINHLANU) kunye nongcoliseko lwe-ionic oluselunxwemeni, ukuyenza ilungele ukusebenza okuphezulu kwimizi-mveliso kunye nezicelo ze-elektroniki.

Imveliso ephumayo iqokelelwa ngokucoca, ngokuqhelekileyo kusetyenziswa intsimbi ene-sintered okanye izihluzi ze-ceramic, kwaye emva koko idityanisiwe ukuya kumaqondo ahlukeneyo ngokuxhomekeke kwisicelo esicetywayo.

1.2 I-Nanoscale Morphology kunye ne-Surface Area Chemistry

Iimpawu ezichazayo ze-alumina evuthayo zixhomekeke kwisitayile sayo se-nanoscale kunye nomphezulu othile ophezulu, edla ngokuhluka ukusuka 50 ukuya 400 m²/g, ngokuxhomekeke kwiimeko zemveliso.

Imilinganiselo yeqhekeza eliphambili lidla ngokuba phakathi 5 kwaye 50 iinanometers, kwaye ngenxa yendlela ye-flame-synthesis, la masuntswana a-amorphous okanye abonisa isigaba se-alumina sotshintsho (njenge γ- okanye δ-Al ₂ O ZIMBINI), ngokuchaseneyo ne-α-alumina ekhuselekileyo ye-thermodynamically (icorundum) isigaba.

Esi sikhokelo se-metastable sinegalelo kumhlaba omkhulu wokuphinda usebenze kwakhona kunye nomsebenzi we-sintering ngokuchasene neefom zecrystalline alumina..

Umphezulu we-alumina evuthayo ugcwele i-hydroxyl (-OH) amaqela, eyenzeka kwisenzo se-hydrolysis ngexesha lokudityaniswa kunye nokuvezwa okulandelayo kukufuma kwe-ambient.

Ezi hydroxyl zommandla ongaphezulu zidlala umsebenzi obalulekileyo ekusekeni ukusasazeka kwemveliso, ubuntununtunu, kunye nentsebenziswano kunye ne-organic kunye ne-inorganic matrices.

( U-Alumina onomsindo)

Ukuxhomekeka kunyango olungaphezulu, I-alumina evuthayo inokuba yi-hydrophilic okanye inikwe i-hydrophobic ngokusebenzisa i-silanization okanye ezinye iinguqulelo zeekhemikhali ezahlukeneyo., ukwenza ukuhambelana okulungiselelweyo kunye neepolima, iintlazi, kunye nezinyibilikisi.

Umgangatho ophezulu wamandla kunye ne-porosity yenza ukuba i-alumina efumileyo ibe lithemba elimangalisayo le-adsorption, i-catalysis, kunye nokuguqulwa kwerheology.

2. Iindima ezisebenzayo kuLawulo lweRheology kunye nokuZinzisa ukusasazwa

2.1 Izenzo ze Thixotropic kunye ne-Anti-Settinging Systems

Phakathi kwesinye sezona zicelo zibalulekileyo zobuchwephesha be-alumina evuthayo kukukwazi ukuguqula iipropati zokuhlala ze-rheological yeenkqubo zolwelo., ngokuthe ngqo kwisiphelo, izinto zokuncamathelisa, ii-inki, kunye nezixhobo ezidibeneyo.

Xa usasazwa ekulayisheni okuncitshisiweyo (ngokubanzi 0.5– 5 wt%), i-alumina efukayo yenza inethiwekhi yokutyhutyha ngokusebenzisa i-hydrogen bonding kunye ne-van der Waals intsebenziswano phakathi koqokelelo lwamasebe ayo., ukuhambisa ulwakhiwo olufana nejeli kulwelo olune-viscosity ephantsi.

Olu nxibelelwano luqhekeza phantsi kwexhala lokucheba (umz., ngexesha lokuxubha, ukutshiza, okanye ukuxuba) kunye nohlaziyo xa uxinzelelo luphelisiwe, imikhwa eyaziwa ngokuba thixotropy.

Thixotropy iyimfuneko ekukhuseleni ekujuleni kwifinishi ezithe tye, inqanda i-pigment ehlala kwiipeyinti, kunye nokugcina i-homogeneity ekuqulunqweni kwamacandelo amaninzi kuyo yonke indawo yokugcina.

Ngokungafaniyo ne-micron-sized thickeners, i-alumina eqhumayo ifezekisa ezi mpembelelo ngaphandle kokwandisa kakhulu i-viscosity jikelele kwilizwe eliqeshiweyo, ukukhusela ukusebenza kunye nokugqiba umgangatho ophezulu.

Ukwengeza, Ubume bayo obungeyondalo buqinisekisa uzinzo lwexesha elide ngokuchasene nokutshatyalaliswa kwentsholongwane kunye nokubola kobushushu, ukodlula uninzi lwezinto ezityebileyo zendalo kwiindawo ezigqithisileyo.

2.2 UbuChwephesha bokusasaza kunye nokuPhuculwa kokuKhawulela

Ukufezekisa ukusasazwa okungaguqukiyo kwe-alumina evuthayo kubalulekile ekwandiseni ukusebenza kwayo kakuhle kunye nokuhlala ucacile kwiziphene ze-agglomerate..

Ngenxa yomgangatho wayo ophezulu kunye noxinzelelo oluqinileyo lwe-interparticle, i-alumina eqhumayo ikholisa ukwenza ii-agglomerates ezinzima ekunzima ukuyonakalisa phantsi usebenzisa ukuxubana kwemveli.

Ukucheba okuphezulu, I-ultrasonication, okanye ezintathu-roll lokusila ziqhele ukuqeshwa deagglomerate umgubo kwaye ukudibanisa kwi matrix host..

Iphathwe ngomphezulu (i-hydrophobic) iimpawu zibonisa ukuhambelana ngcono kakhulu kunye non-polar media ezifana epoxy resins, iipolyurethanes, kunye neoli ye-silicone, ukunciphisa amandla afunekayo ekusasazeni.

Kwiinkqubo ezisekelwe kwi-solvent, Ukukhethwa kwe polarity yesinyibilikisi kufuneka ihambelane nomphezulu we chemistry ye alumina ukwenza ukumanzisa nokhuseleko oluthile..

Ukusasazwa okuchanekileyo akukhuphi nje ulawulo lwe-rheological kodwa ngokunjalo konyusa inkxaso yoomatshini, ukucaca kwamehlo, kunye nokhuseleko lwe-thermal kwikhompawundi yokugqibela.

3. Inkxaso kunye noPhuculo oluSebenzayo kwiiMveliso eziDityanisiweyo

3.1 Ukwandiswa kweZakhiwo zoomatshini kunye ne-Thermal

I-alumina efumileyo isebenza njenge-multifunctional additives kwi-polymer kunye ne-ceramic compounds, igalelo ekomelezeni oomatshini, ukuzinza kwe-thermal, kunye nezithintelo zamakhaya.

Xa ihlakazwe kakuhle, amasuntswana obungakanani be-nano kunye nesakhelo sothungelwano sawo sinqanda intshukumo yekhonkco lepolymer, ukwandisa imodyuli, ukuqina, kunye nokuxhathisa kwe-matrix.

Kwiinkqubo ze-epoxy kunye ne-silicone, I-alumina evuthayo iphucula ukuhanjiswa kwe-thermal kancinane ngelixa iphucula kakhulu ukhuseleko lomda phantsi kwebhayisekile eshushu..

Indawo yayo ephezulu yokunyibilika kunye nokungangeni kweekhemikhali kwenza ukuba ii-composites zigcine ingqibelelo kumazinga obushushu anyusiweyo, ukwenza ukuba zilungele ukufakwa kwedijithali, izixhobo ze-aerospace, kunye neegaskets ezinobushushu obuphezulu.

Ukwengeza, uthungelwano olungqindilili olwenziwe yi-alumina evuthayo inokusebenza njengomqobo wokusasaza, ukunciphisa ukuvuza kwisakhiwo seegesi kunye nokufuma– luncedo kwiingubo zokhuseleko kunye neemveliso zokupakisha.

3.2 I-Insulation yoMbane kunye nokusebenza kweDielectric

Nokuba yeyiphi na i-nanostructured morphology, i-alumina evuthayo igcina umbane obalaseleyo okhusela amakhaya ngokukodwa ubunzima bokukhanya kwe-aluminiyam oxide.

Ngomthamo wokumelana nokugqithisa 10 ¹² Ω · cm kunye namandla edielectric eliqela kV/mm, isetyenziswa ngokubanzi kwiimveliso zokugquma ii-voltage eziphezulu, kuquka nokuyeka umabonakude wentambo, isixhobo sokutshintsha, kunye nebhodi yesekethe eprintiweyo (PCB) laminates.

Xa ifakwe ngqo kwirabha ye-silicone okanye izixhobo ze-epoxy, I-alumina evuthayo ayiqinisekisi kuphela izinto eziphathekayo kodwa ikwanceda ukutshabalalisa ukufudumala kunye nokunciphisa ukukhutshwa okungaphelelanga., ukwandisa ubomi obude beenkqubo zokugquma umbane.

Kwi-nanodielectrics, Ujongano phakathi kwamasuntswana e-alumina afumileyo kunye nepolymer matrix idlala indima ebalulekileyo ekubambiseni ababoneleli ngeendleko kunye nokutshintsha ukujikeleza kombane., kuzisa ukomelela ukomelela ukomelela kunye nokunciphisa ilahleko yedielectric.

Ubunjineli obuphakathi kobuso bubalulekile kugxininiso lwesizukulwana esilandelayo seemveliso zokugquma kumbane kunye neenkqubo zamandla ahlaziyekayo..

4. Izicelo eziphezulu kwi-Catalysis, Ukugudisa, kunye neeTekhnoloji ezisakhulayo

4.1 INkxaso ye-Catalytic kunye nobuNtunu beNdawo yoMphezulu

Umphezulu ophezulu kunye nommandla womphezulu we-hydroxyl ubukhulu be-alumina evuthayo buyenza ibe yimveliso yenkxaso esebenzayo ye-heterogeneous catalysts..

Isetyenziselwa ukusasaza iintlobo zentsimbi ezisebenzayo ezifana neplatinam, ipalladium, okanye i-nickel kwiimpendulo ezibandakanya i-hydrogenation, dehydrogenation, kunye nokuguqulwa kwehydrocarbon.

Izigaba ze-alumina eziguqukayo kwi-alumina evuthayo zibonelela ngebhalansi yomphezulu we-asidi kunye nokuzinza kwe-thermal., ukuncedisa ukusebenzisana kwenkxaso yentsimbi eqinileyo ethintela ukuntywila kunye nokuphucula umsebenzi we-catalytic.

Kwi-catalysis yokusingqongileyo, Iinkqubo ezisekwe kwi-alumina efumileyo zisetyenziselwa ukuphelisa iikhompawundi zesulfure kwirhasi (i-hydrodesulfurization) kunye nokuqhekeka kwezinto zendalo ezingazinzanga (IiVOCs).

Amandla ayo okuthengisa kunye nokwenza iimolekyuli zisebenze kujongano lomsebenzisi we-nanoscale ziyibeka njengethemba elinomtsalane lekhemistri eluhlaza kunye nobunjineli benkqubo ezinzileyo..

4.2 Ukuchaneka ukuPruca phezulu kunye nokuQeda kweNdawo yoMphezulu

I-alumina evuthayo, ngakumbi kwiintlobo ze-colloidal okanye i-submicron esetyenzisiweyo, isetyenziselwa ukuchaneka okukhazimlayo kwe-slurries kwiilensi zamehlo, ii-semiconductor wafers, kunye nemidiya yendawo yokugcina imagnethi.

Ubungakanani bayo obufanayo, ukuqina okulawulwayo, kunye nokungangeni kweekhemikhali kwenza kube lula ummandla ocolekileyo womphezulu ogqityiweyo ngomonakalo omncinci ongaphantsi komhlaba.

Xa kudityaniswa nezisombululo ezilungelelanisiweyo ze-pH kunye ne-polymeric dispersants, Udaka olusekwe kwi-alumina efumileyo lufumana uburhabaxa bendawo yomgangatho we-nanometer, ibaluleke kakhulu ekusebenzeni okuphezulu kwezinto ezibonakalayo kunye ne-elektroniki.

Usetyenziso oluvelayo lubandakanya i-chemical-mechanical planarization (CMP) kwimveliso ye-semiconductor entsha, apho amaxabiso achanekileyo okususwa kwezinto kunye nokufana komhlaba kubaluleke kakhulu.

Ukusetyenziswa okuqhelekileyo kwangaphambili, i-alumina evuthayo iyaphononongwa kwindawo yokugcina amandla, iiyunithi zokuva, kunye neemveliso ezithintela umlilo, apho ukhuseleko lwayo lwe-thermal kunye nokusebenza komphezulu kunika izibonelelo ezahlukileyo.

Ukushwankathela, ifumed alumina imele ukudityaniswa kobunjineli benanoscale kunye nokuguquguquka okuluncedo.

Ukusuka kwimvelaphi yayo eyenziwe ngamadangatye ukuya kwiindima zayo kulawulo lwe-rheology, ukuqiniswa okuhlanganisiweyo, i-catalysis, kunye nokwenza ngokuchanekileyo, le mveliso yokusebenza okuphezulu iyaqhubeka ivumela itekhnoloji kwiindawo ezahlukeneyo zobugcisa.

Njengoko imfuno ikhula kwiimveliso ezihambele phambili ezinomgangatho olungiselelweyo kunye neempawu ezininzi, I-alumina evuthayo ihleli ibalulekile kwisizukulwana esilandelayo senkqubo yoshishino neye-elektroniki.

Umboneleli

I-Alumina Technology Co., Ltd igxile kuphando kunye nophuhliso, ukuveliswa kunye nokuthengiswa kwe-aluminium oxide powder, iimveliso ze-aluminium oxide, i-aluminium oxide crucible, njl., ukusebenzela i-elektroniki, iiseramikhi, Iikhemikhali kunye namanye amashishini. Ukususela ekusekweni kwayo kwi 2005, inkampani izibophelele ekuboneleleni abathengi ngezona mveliso kunye neenkonzo ezingcono. Ukuba ujonge umgangatho ophezulu gamma alumina powder, nceda uzive ukhululekile ukuqhagamshelana nathi. ([email protected])
Iithegi: U-Alumina onomsindo,ialumina,kusetyenziswa umgubo we-alumina

Onke amanqaku kunye nemifanekiso avela kwi-Intanethi. Ukuba kukho nayiphi na imiba ye-copyright, nceda uqhagamshelane nathi ngexesha lokucima.

Sibuze