U-Alumina othukuthele (I-aluminium oxide): I-Nanoscale Architecture kanye ne-Multifunctional Applications ye-High-Surface-Area Ceramic Material gamma alumina powder

1. I-synthesis, Uhlaka, kanye nezici ezibalulekile ze-Fumed Alumina

1.1 I-Production Mechanism kanye ne-Aerosol-Phase Formation

(U-Alumina othukuthele)

I-alumina evuthayo, ebizwa nangokuthi i-pyrogenic alumina, ubumsulwa obuphakeme, ifomu le-nanostructured le-lightweight aluminium oxide (Al ₂ O ESITHUPHA) idalwe ngenqubo yokuhlanganiswa kwesigaba sokushisa okuphezulu kwe-vapor.

Ngokungafani nama-alumina avamile abaliwe noma awanathile, i-alumina evuthayo idalwa ku-reactor yomlilo lapho izandulela eziqukethe i-aluminium– ngokuvamile i-aluminium chloride enesisindo esincane (AlCl ezine) noma izinto ze-organoaluminium– zithungelwa elangeni le-hydrogen-oksijeni emazingeni okushisa adlula 1500 °C.

Kulesi simo esinzima, isandulela siyashintshashintsha bese singena ku-hydrolysis noma i-oxidation ukuze senze umhwamuko we-aluminium oxide okhanyayo, elingena ngokushesha kuma-nanoparticles abalulekile njengoba igesi iphola.

Lezi zinhlayiya eziqalayo ziyashayisana futhi zihlangane ndawonye esigabeni segesi, ukwakha ukunqwabelana okufana neketango okubanjwe komunye nomunye ngamabhondi aqinile aqinile, leading to a highly porous, three-dimensional network structure.

The entire process occurs in an issue of milliseconds, producing a penalty, cosy powder with exceptional purity (frequently > 99.8% I-Al ₂ O EZINHLANU) and marginal ionic contaminations, making it ideal for high-performance industrial and electronic applications.

The resulting product is collected via purification, generally making use of sintered steel or ceramic filters, and after that deagglomerated to varying degrees depending on the intended application.

1.2 Nanoscale Morphology and Surface Area Chemistry

The defining attributes of fumed alumina depend on its nanoscale style and high particular surface, which usually varies from 50 ku 400 m²/g, depending on the production conditions.

Primary fragment dimensions are usually in between 5 futhi 50 ama-nanometers, and due to the flame-synthesis mechanism, lezi zingcezu ziyi-amorphous noma zibonisa isigaba se-alumina sesikhashana (njenge γ- noma δ-Al ₂ O TWO), ngokuphambene ne-α-alumina evikelekile ye-thermodynamically (i-corundum) isigaba.

Lolu hlaka lwe-metastable lunomthelela ekusebenzeni kabusha kwendawo ephezulu kanye nomsebenzi we-sintering uma kuqhathaniswa namafomu e-crystalline alumina..

Indawo engaphezulu ye-alumina evuthayo igcwele i-hydroxyl (-OH) amaqembu, okwenzeka esenzweni se-hydrolysis ngesikhathi sokuhlanganiswa kanye nokuchayeka okulandelayo kumswakama osendaweni.

Lawa ma-hydroxyl angaphezulu adlala umsebenzi obalulekile ekusunguleni ukuhlakazeka komkhiqizo, ukuzwela, kanye nokusebenzelana namatrices wezinto eziphilayo kanye ne-inorganic.

( U-Alumina othukuthele)

Ukuthembela ekwelashweni okungaphezulu, i-alumina evuthayo ingaba yi-hydrophilic noma inikezwe i-hydrophobic ngokusebenzisa i-silanization noma ezinye izinguquko zamakhemikhali ezihlukahlukene., ivumela ukuhambisana okulungiselelwe nama-polymers, izinhlaka, kanye nezincibilikisi.

Amandla asendaweni ephezulu kanye ne-porosity kwenza i-alumina evuthayo ibe yithemba elihle kakhulu le-adsorption, i-catalysis, kanye nokuguqulwa kwe-rheology.

2. Izindima Ezisebenzayo Ekulawuleni I-Rheology kanye Nokuqinisa Ukusabalalisa

2.1 Izenzo Thixotropic kanye Nezinhlelo Zokuhlalisa

Phakathi kwezicelo ezibaluleke kakhulu zezobuchwepheshe ze-alumina evuthayo amandla ayo okuguqula izindawo zokuhlala ze-rheological zesistimu ye-liquid., ngokukhethekile emaphethelweni, okunamathelayo, oyinki, kanye nezinto eziyinhlanganisela.

Uma ihlakazwa ekulayisheni okwehlisiwe (ngokuvamile 0.5– 5 wt%), i-alumina evuthayo yakha inethiwekhi evuvuzayo nge-hydrogen bonding kanye nokusebenzisana kwe-van der Waals phakathi kokunqwabelana kwayo okunamagatsha., ukuhambisa ukwakheka okufana nejeli oketshezini olune-viscosity ephansi.

Le nethiwekhi igqashuka ngaphansi kokukhathazeka kwe-shear (isib., ngesikhathi sokuxubha, ukufutha, noma ukuxuba) kanye nezinguquko lapho ukungezwani kuqedwa, imikhuba eyaziwa ngokuthi thixotropy.

Thixotropy iyadingeka ukuze uvikele ekungeneni ekuqedeni okuqondile, ukuvimbela i-pigment ukuhlala kumapende, kanye nokugcina i-homogeneity ekwakhiweni kwezingxenye eziningi phakathi nendawo yokugcina.

Ngokungafani nama-thickeners angama-micron, i-alumina evuthayo ifinyelela le mithelela ngaphandle kokwandisa kakhulu i-viscosity evamile esimweni esiqashiwe, ukuvikela ukusebenza kahle nokuqeda ikhwalithi ephezulu.

Ngaphezu kwalokho, Imvelo yayo engeyona eyemvelo iqinisekisa ukuzinza kwesikhathi eside ngokumelene nokubhujiswa kwamagciwane kanye nokubola okushisayo, ukwedlula ama-thickeners amaningi e-organic ezimweni ezimbi kakhulu.

2.2 Amasu Okusabalalisa Nokuthuthukisa Ukuhambisana

Ukuzuza ukuhlakazeka okungaguquguquki kwe-alumina evuthayo kubalulekile ekwandiseni ukusebenza kwayo kahle nokuhlala ucacile kumaphutha e-agglomerate.

Ngenxa yokuphakama kwayo okuphezulu kanye nezingcindezi eziqinile ze-interparticle, i-alumina evuthayo ivamise ukwakha ama-agglomerate aqinile okunzima ukuwalimaza kusetshenziswa ukuxutshwa kwendabuko.

Ukuhlanganiswa kwe-high-shear, ultrasonication, noma ukugaya ama-roll-roll ngokuvamile asetshenziswa ukuze kukhishwe impushana futhi kuhlanganiswe ne-matrix yokusingatha..

Ukwelashwa kwendawo (i-hydrophobic) Izimfanelo zibonisa ukuhambisana okungcono kakhulu nemidiya engeyona indawo epholile njengama-epoxy resins, polyurethanes, namafutha e-silicone, ukunciphisa amandla adingekayo ukuze ukusabalalisa.

Ezinhlelweni ezisekelwe ku-solvent, ukukhethwa kwe-solvent polarity kufanele kufaniswe nekhemistri engaphezulu ye-alumina ukuze kwenziwe ukumanzisa nokuvikeleka okuthile..

Ukuhlakazeka okulungile akugcini nje ngokukhuphula ukulawulwa kwe-rheological kodwa futhi kukhulisa ukwesekwa kwemishini, ukukhanya okukhanyayo, kanye nokuphepha okushisayo endaweni yokugcina.

3. Ukusekela kanye Nokuthuthukiswa Okungokoqobo Emikhiqizweni Ehlanganisiwe

3.1 Ukuthuthukiswa Kwezakhiwo Zemishini Nezishisayo

I-alumina evuthayo isebenza njengesengezo esisebenza ngezinto eziningi kumakhompiyutha we-polymer kanye ne-ceramic, ukufaka isandla ekuqinisweni kwemishini, ukuzinza okushisayo, kanye nezindlu ezivimbelayo.

Lapho ihlakazeke kahle, amabhithi anosayizi we-nano kanye nohlaka lwawo lwenethiwekhi lukhawulela ukunyakaza kwe-polymer chain, ukuthuthukisa i-modulus, ukuqina, nokumelana nokukhasa kwe-matrix.

Kuzinhlelo ze-epoxy ne-silicone, i-alumina evuthayo ithuthukisa ukusebenza kwe-thermal kancane ngenkathi ithuthukisa kakhulu ukuphepha kohlangothi ngaphansi kokuhamba ngebhayisikili okushisayo.

Iphoyinti layo eliphezulu lokuncibilika kanye nokungangenisi kwamakhemikhali kwenza izinhlanganisela zigcine ubuqotho emazingeni okushisa aphakeme, ukubenza bafanelekele i-digital encapsulation, izingxenye ze-aerospace, kanye nama-gaskets anezinga eliphezulu lokushisa.

Ngaphezu kwalokho, inethiwekhi ewugqinsi eyakhiwe i-alumina evuthayo ingasebenza njengesithiyo sokusabalalisa, ukunciphisa ukuvuza esakhiweni samagesi nomswakama– kunenzuzo kumasembozo okuphepha kanye nemikhiqizo yokupakisha.

3.2 I-Electric Insulation kanye nokusebenza kwe-Dielectric

Kungakhathaliseki ukuthi i-nanostructured morphology yayo, i-alumina evuthayo igcina amakhaya avikela ugesi avelele ikakhulukazi we-lightweight aluminium oxide.

Nge-resistivity yevolumu eyedlula yonke 10 ¹² Ω · cm namandla e-dielectric ama-kV/mm ambalwa, isetshenziswa kabanzi emikhiqizweni yokufakwa kwamandla kagesi aphezulu, okuhlanganisa ukunqanyulwa kukamabonakude wekhebula, i-switchgear, kanye nebhodi lesifunda eliphrintiwe (PCB) ama-laminates.

Uma ifakwe phakathi kwerabha ye-silicone noma izinto ze-epoxy, i-fumed alumina ayigcini nje ngokuqinisa izinto ezibonakalayo kodwa futhi isiza ekuqedeni ukufudumala nokunciphisa ukukhishwa okuyingxenye., ukukhulisa isikhathi eside sezinhlelo zokuvala ugesi.

Ku-nanodielectrics, ukuxhumana phakathi kwezinhlayiya ze-alumina evuthayo kanye ne-polymer matrix kudlala indima ebalulekile ekucupheni abahlinzeki bezindleko nasekuguquleni ukujikeleza kwenkundla kagesi., ukuletha ukumelana nokwehluleka okuthuthukisiwe kanye nokulahlekelwa okuncane kwe-dielectric.

Lobu njiniyela obuhlanganisa ubuso buyinto ebalulekile ekugxilweni kwayo ekuthuthukisweni kwemikhiqizo yokufaka esizukulwaneni esilandelayo kugesi wamandla kanye nezinhlelo zamandla avuselelekayo..

4. Izicelo Ezithuthukisiwe ku-Catalysis, Ukupholisha, kanye ne-Emerging Technologies

4.1 Ukusekela kwe-Catalytic kanye Nokuzwela kwendawo engaphezulu

Ingaphezulu nendawo ephezulu ye-hydroxyl ukujiya kwe-alumina evuthayo kuyenza ibe umkhiqizo osekelayo wama-catalysts ahlukahlukene..

Isetshenziselwa ukuhlakaza izinhlobo zensimbi ezisebenzayo njengeplatinamu, i-palladium, noma i-nickel ekuphenduleni okubandakanya i-hydrogenation, i-dehydrogenation, kanye nokuguqulwa kwe-hydrocarbon.

Izigaba ze-alumina zesikhashana ku-alumina evuthayo zinikeza ibhalansi yezinga le-asidi elingaphezulu kanye nokuzinza kwe-thermal., ukusiza ngokusebenzisana okuqinile kokusekelwa kwensimbi okugwema ukucwila futhi kuthuthukise umsebenzi we-catalytic.

Ku-catalysis yemvelo, Amasistimu asekelwe ku-alumina-fumed asetshenziswa ekuqedeni izinhlanganisela zesibabule egesini (i-hydrodesulfurization) nasekuhlakazweni kwezinto zemvelo ezingazinzile (Ama-VOC).

Amandla ayo okukhangisa kanye nokwenza kusebenze ama-molecule esixhumi esibonakalayo somsebenzisi we-nanoscale ayibeka njengethemba elikhangayo lekhemikhali eluhlaza kanye nobunjiniyela benqubo obuqhubekayo..

4.2 Ukunemba Ukwephuka Nokuqedwa Kwendawo Yokuphezulu

I-alumina evuthayo, ikakhulukazi ezinhlotsheni ezicutshunguliwe ze-colloidal noma i-submicron, isetshenziswa ngokunemba ekukhanyeni ama-slurries kuma-optical lens, ama-wafers we-semiconductor, kanye nemidiya yendawo yokugcina kazibuthe.

Usayizi wayo omncane ongaguquki, ukuqina okulawulwayo, kanye nokungangenisi kwamakhemikhali kwenza kube nokwenzeka indawo engaphezulu ekahle eqedwe ngomonakalo omncane ongaphansi komhlaba.

Uma kuhlanganiswe nezixazululo ezilungiswe nge-pH kanye nama-polymeric dispersants, ama-slurries asekelwe ku-alumina efumisiweyo athola ubulukhuni bendawo yezinga le-nanometer, okubalulekile ekusebenzeni okuphezulu kwezinto ezibonakalayo nezisebenza ngogesi.

Izinhlelo ezisafufusa zibandakanya i-chemical-mechanical planarization (I-CMP) ekukhiqizeni ama-semiconductor amasha, lapho amanani anembile okususwa kwezinto kanye nokufana kwendawo kubalulekile.

Ukusetshenziswa okwedlule okujwayelekile, i-alumina evuthayo iyahlolwa endaweni yokugcina amandla, amayunithi ezinzwa, kanye nemikhiqizo evimbela amalangabi, lapho ukuphepha kwayo okushisayo nokusebenza kwendawo kunikeza izinzuzo ezihlukile.

Ukuphetha, i-fumed alumina imele ukuhlanganiswa kobunjiniyela be-nanoscale kanye nokuguquguquka okuwusizo.

Kusukela emsuka wayo owenziwe ngelangabi kuya ezindimeni zayo ekulawuleni i-rheology, ukuqinisa okuhlanganisiwe, i-catalysis, kanye nokukhiqiza okunembayo, lo mkhiqizo osebenza kahle kakhulu uyaqhubeka nokuvumela ubuchwepheshe kuzo zonke izizinda zobuchwepheshe ezihlukahlukene.

Njengoba kukhula isidingo semikhiqizo ethuthukisiwe enendawo efanelanisiwe kanye nezakhiwo eziningi, i-alumina evuthayo isalokhu inamandla abalulekile ezizukulwaneni ezilandelayo zezimboni nezinhlelo zikagesi.

Umhlinzeki

Le nkampani Alumina Technology Co., Ltd., Ltd igxile ocwaningweni nasekuthuthukisweni, ukukhiqizwa nokudayiswa kwe-aluminium oxide powder, imikhiqizo ye-aluminium oxide, i-aluminium oxide crucible, njll., ukusebenzela ugesi, izitsha zobumba, izimboni zamakhemikhali nezinye. Selokhu yasungulwa ngo 2005, inkampani izibophezele ekuhlinzekeni amakhasimende ngemikhiqizo namasevisi angcono kakhulu. Uma ufuna izinga eliphezulu i-gamma alumina powder, sicela ukhululeke ukuxhumana nathi. ([email protected])
Omaka: U-Alumina othukuthele,i-alumina,ukusetshenziswa kwe-alumina powder

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