Alumina Wamphamvu (Aluminium oxide): Nanoscale Architecture ndi Multifunctional Applications of High-Surface-Area Ceramic Material gamma alumina powder

1. Kaphatikizidwe, Framework, ndi Zinthu Zofunikira za Alumina Wofukizira

1.1 Njira Yopangira ndi Mapangidwe a Aerosol-Phase

(Alumina Wamphamvu)

Aluminium wakuda, Zomwe zimatchedwanso pyrogenic alumina, ndi chiyero chapamwamba, mawonekedwe a nanostructured of lightweight aluminium oxide (Al ₂ O SIX) adapangidwa kudzera munjira yopangira kutentha kwambiri kwa nthunzi.

Mosiyana ochiritsira calcined kapena mpweya zotayidwa, fumed alumina imapangidwa mu choyatsira lawi pomwe zoyambira zokhala ndi aluminiyamu– Nthawi zambiri, aluminium kloride yopepuka yopepuka (AlCl zinayi) kapena zinthu za organoaluminium– amayatsidwa mu lawi la hydrogen-oxygen pa kutentha kupitirira 1500 °C.

M'mlengalenga wovutawu, kalambulabwalo amasinthasintha ndikulowa hydrolysis kapena oxidation kuti apange mpweya wopepuka wa aluminiyamu oxide, yomwe imalowa mwachangu mu nanoparticles pomwe mpweya ukuzirala.

Tinthu tating'onoting'ono timeneti timagundana ndikuphatikizana mu gawo la mpweya, kupanga maunyolo ngati maunyolo omwe amagwiridwa wina ndi mzake ndi zomangira zolimba zolimba, kumabweretsa porous kwambiri, mawonekedwe a maukonde atatu-dimensional.

Njira yonseyi imachitika munkhani ya milliseconds, kupanga chilango, ufa wofewa wokhala ndi chiyero chapadera (pafupipafupi > 99.8% Al ₂ O ZISANU) ndi kuipitsidwa kwa ionic m'mphepete, kupangitsa kuti ikhale yabwino pamafakitale apamwamba komanso zamagetsi zamagetsi.

Zotsatira zake zimasonkhanitsidwa kudzera mu kuyeretsedwa, Nthawi zambiri amagwiritsa ntchito zitsulo zosungunuka kapena zosefera za ceramic, ndipo zitatha izi zidasinthidwa mosiyanasiyana malinga ndi zomwe akufuna.

1.2 Nanoscale Morphology ndi Surface Area Chemistry

Mawonekedwe a aluminiyamu ya fumed amatengera mawonekedwe ake a nanoscale komanso pamwamba kwambiri, zomwe nthawi zambiri zimasiyana 50 ku 400 m²/g, kutengera momwe zinthu ziliri.

Miyezo yachidutswa choyambirira nthawi zambiri imakhala pakati 5 ndi 50 nanometers, komanso chifukwa cha makina opangira moto, ting'onoting'ono izi ndi amorphous kapena kusonyeza kusintha kwa alumina gawo (monga γ- kapena δ-Al ₂ O AWIRI), mosiyana ndi α-alumina yotetezedwa ndi thermodynamically (corundum) gawo.

Dongosolo losasunthikali limathandizira kuti pakhale kukhazikika kwapadziko lonse lapansi komanso ntchito yoyimitsa kusiyana ndi mawonekedwe a crystalline alumina..

Pamwamba pa aluminiyamu ya fumed ndi yochuluka mu hydroxyl (-OH) magulu, zomwe zimachitika kuchokera ku hydrolysis kanthu pa kaphatikizidwe ndi kukhudzana wotsatira chinyezi yozungulira.

Ma hydroxyl apamtunda awa amagwira ntchito yofunika kwambiri pakukhazikitsa kufalikira kwazinthu, kumva, ndi kuyanjana ndi ma organic ndi matrices.

( Alumina Wamphamvu)

Kudalira mankhwala pamwamba, fumed alumina imatha kukhala hydrophilic kapena kuperekedwa kwa hydrophobic kudzera mu silanization kapena kusintha kwina kwamankhwala., kupangitsa kuti zigwirizane ndi ma polima, utomoni, ndi zosungunulira.

Mphamvu zam'mwamba zam'mwamba ndi porosity zimapangitsanso kuti alumina wofukizira akhale chiyembekezo chabwino kwambiri cha adsorption, catalysis, ndi kusintha kwa rheology.

2. Maudindo Ogwira Ntchito mu Rheology Control and Diffusion Stablizing

2.1 Zochita za Thixotropic ndi Anti-Settling Systems

Chimodzi mwazofunikira kwambiri mwaukadaulo wa aluminiyamu ya fumed ndi kuthekera kwake kosintha malo okhala amadzimadzi., makamaka mu zomaliza, zomatira, inki, ndi zinthu zophatikiza.

Pamene omwazika pa kuchepetsa loadings (pafupifupi 0.5– 5 wt%), fumed alumina imapanga netiweki yodutsa kudzera pa hydrogen bonding ndi van der Waals kulumikizana pakati pa nthambi zake, kutengera kapangidwe ka gel osakaniza ku zakumwa zotsika mamasukidwe amadzimadzi.

Netiweki iyi imasweka ndi nkhawa yakumeta ubweya (mwachitsanzo, panthawi yotsuka, kupopera mbewu mankhwalawa, kapena kusakaniza) ndi kusintha pamene kusamvana kuthetsedwa, zizolowezi zotchedwa thixotropy.

Thixotropy ndiyofunikira kuti mutetezedwe pakugwa muzomaliza zowongoka, kulepheretsa pigment kulowa mu utoto, ndikusunga homogeneity muzopanga zamitundu yambiri nthawi yonse yosungira.

Mosiyana ndi ma micron-kakulidwe thickeners, fumed alumina amakwaniritsa izi popanda kuchulukitsa kukhuthala kwa anthu onse pantchito, kulimbitsa chitetezo chokwanira komanso kumaliza ntchito yabwino.

Kuphatikiza apo, chikhalidwe chake osati chilengedwe chimatsimikizira kukhazikika kwa nthawi yayitali motsutsana ndi kuwonongeka kwa tizilombo toyambitsa matenda ndi kuwonongeka kwa kutentha, kupitilira ma organic thickeners ambiri m'malo ovuta kwambiri.

2.2 Njira Zobalalitsira ndi Kukonzekera Kogwirizana

Kukwaniritsa kubalalitsidwa kosalekeza kwa aluminiyamu ya fumed ndikofunikira kwambiri kuti ntchito yake igwire bwino ntchito komanso kuti isapewe zolakwika zambiri..

Chifukwa chapamwamba pamwamba ndi olimba interparticle mavuto, fumed aluminiyamu nthawi zambiri imakonda kupanga ma agglomerates olimba omwe ndi ovuta kuwononga pogwiritsa ntchito kusakaniza kwachikhalidwe.

Kuphatikizana kwakukulu, ultrasonication, kapena mphero yama-rolls nthawi zambiri imagwiritsidwa ntchito kuti iwononge ufa ndikuwuphatikiza ndi masanjidwewo..

Zopangidwa pamwamba (hydrophobic) Makhalidwe amawonetsa kuyanjana kwabwinoko ndi media zomwe sizikhala polar monga ma epoxy resins, polyurethanes, ndi mafuta a silicone, kuchepetsa mphamvu yofunikira pakufalitsa.

M'machitidwe osungunulira, Kusankhidwa kwa zosungunulira polarity kuyenera kufananizidwa ndi chemistry ya pamwamba pa alumina kuti pakhale kunyowetsa kwina ndi chitetezo..

Kubalalitsidwa kolondola sikumangowonjezera kuwongolera kwa ma rheological komanso kumawonjezera chithandizo chamakina, kuwala bwino, ndi chitetezo chamafuta mumagulu omaliza.

3. Thandizo ndi Kuwongoleredwa Kwambiri Pazinthu Zophatikiza

3.1 Kupititsa patsogolo Zomangamanga ndi Zotentha

Fumed alumina imagwira ntchito ngati chowonjezera chowonjezera mu polima ndi zida za ceramic, zimathandizira pakulimbitsa kwamakina, kukhazikika kwamafuta, ndi nyumba zotchinga.

Pamene obalalitsidwa bwino, ma bits a nano-size ndi maukonde awo amalepheretsa kuyenda kwa polymer chain, kuwonjezera modulus, kulimba, ndi kukwapula kukana kwa matrix.

Mu epoxy ndi silikoni machitidwe, fumed alumina imathandizira kutenthetsa pang'ono pomwe imathandizira kwambiri chitetezo cham'mbali pansi pa njinga yamoto.

Malo ake osungunuka kwambiri komanso kusasunthika kwa mankhwala kumathandizira kuti ma kompositi asunge umphumphu pa kutentha kwakukulu, kuwapanga kukhala oyenera kwa digito encapsulation, zida zamlengalenga, ndi ma gaskets otentha kwambiri.

Kuphatikiza apo, netiweki wandiweyani wopangidwa ndi fumed alumina amatha kukhala ngati cholepheretsa kufalikira, kuchepetsa kutayikira mu kapangidwe ka mpweya ndi chinyezi– zopindulitsa pazovala zotetezera ndi zinthu zopakira.

3.2 Electric Insulation ndi Dielectric Performance

Mosasamala kanthu za nanostructured morphology, fumed aluminiyamu imasunga nyumba zodzitchinjiriza zamagetsi makamaka zopepuka za aluminium oxide.

Ndi kuchuluka kwa resistivity kuposa 10 ¹² Ω · masentimita ndi mphamvu ya dielectric ya kV/mm angapo, amagwiritsidwa ntchito kwambiri m'zinthu zopangira magetsi okwera kwambiri, kuphatikizapo ma TV discontinuations chingwe, switchgear, ndi bolodi losindikizidwa (PCB) laminates.

Mukaphatikizidwa mu rabala ya silikoni kapena zida za epoxy, fumed alumina sikuti imangolimbitsa zinthuzo komanso imathandizira kutulutsa kutentha ndikuchepetsa kutulutsa pang'ono., kukulitsa moyo wautali wamakina otchinjiriza magetsi.

Mu nanodielectrics, mawonekedwe pakati pa fumed alumina particles ndi polima matrix amatenga gawo lofunika kwambiri msampha opereka ndalama ndi kusintha magetsi magetsi., bweretsani kukana kulephera kowonjezereka ndikuchepetsa kutayika kwa dielectric.

Uinjiniya wamawonekedwe awa ndiwofunikira kwambiri pakupititsa patsogolo zinthu zotchinjiriza za m'badwo wotsatira wamagetsi amagetsi ndi mphamvu zongowonjezwdwa.

4. Mapulogalamu apamwamba mu Catalysis, Kupukutira, ndi Emerging Technologies

4.1 Thandizo la Catalytic ndi Surface Area Sensitivity

Kukula kwapamwamba komanso kumtunda kwa hydroxyl makulidwe a aluminiyamu wofukizira kumapangitsa kuti ikhale chithandizo chothandizira pazothandizira mosiyanasiyana..

Amagwiritsidwa ntchito kufalitsa mitundu yachitsulo yogwira ntchito monga platinamu, palladium, kapena nickel mu machitidwe okhudzana ndi hydrogenation, dehydrogenation, ndi hydrocarbon reforming.

Magawo osinthika a alumina mu alumina wofukizira amapereka kuchuluka kwa acidity komanso kukhazikika kwamafuta., kuthandizira ndi kulumikizana kolimba kothandizira zitsulo zomwe zimapewa kusokoneza komanso kupititsa patsogolo ntchito zolimbikitsa.

Mu catalysis zachilengedwe, Makina opangira fumed aluminiyamu amagwiritsidwa ntchito pochotsa zosakaniza za sulfure ku gasi (hydrodesulfurization) ndi kupasuka kwa zinthu zosakhazikika zachilengedwe (VOCs).

Kuthekera kwake kutsatsa ndi kuyambitsa mamolekyu pa mawonekedwe ogwiritsa ntchito nanoscale kumayiyika ngati chiyembekezo chosangalatsa cha chemistry yobiriwira komanso uinjiniya wokhazikika..

4.2 Precision Sprucing Up ndi Surface Area Kumaliza

Aluminium wakuda, makamaka mu mitundu yopangidwa ndi colloidal kapena submicron, amagwiritsidwa ntchito mwatsatanetsatane slurries kuwala kwa magalasi owala, zowonda za semiconductor, ndi maginito osungira malo media.

Kukula kwake kosasinthasintha, kukhazikika kokhazikika, ndi kusakhazikika kwa mankhwala kumapangitsa kuti pakhale malo abwino kwambiri omalizidwa osawonongeka pang'ono.

Mukaphatikizidwa ndi njira zosinthidwa ndi pH ndi ma polymeric dispersants, Mafuta opangidwa ndi aluminiyamu opangidwa ndi fumed amakhala aukali pamtunda wa nanometer, zofunika kwa mkulu-ntchito optical ndi zinthu zamagetsi.

Ntchito zomwe zikubwera zimakhala ndi makina opangira makina (CMP) mukupanga kwatsopano kwa semiconductor, kumene mitengo yeniyeni yochotsera zinthu ndi kufanana kwapamwamba ndizofunikira kwambiri.

Zomwe zimagwiritsidwa ntchito m'mbuyomu, fumed alumina ikufufuzidwa posungira mphamvu, mayunitsi ozindikira, ndi zinthu zoletsa moto, komwe chitetezo chake chamafuta ndi magwiridwe antchito apamwamba amapereka zopindulitsa zapadera.

Pomaliza, fumed alumina imayimira kuphatikiza kwaukadaulo wa nanoscale komanso kusinthasintha kothandiza.

Kuchokera kumagwero ake opangidwa ndi lawi kupita ku maudindo ake pakuwongolera rheology, kuphatikiza kompositi, catalysis, ndi kupanga molondola, chida chapamwamba ichi chikupitilira kulola ukadaulo kumadera osiyanasiyana aukadaulo.

Pamene kufunikira kumakula pazinthu zapamwamba zokhala ndi zokongoletsedwa pamwamba ndi katundu wambiri, fumed alumina ikadali chothandizira kwambiri pamakina amakampani ndi zamagetsi am'badwo wotsatira.

Wopereka

Malingaliro a kampani Alumina Technology Co., Ltd., Ltd imayang'ana kwambiri pa kafukufuku ndi chitukuko, kupanga ndi kugulitsa ufa wa aluminium oxide, zinthu za aluminium oxide, aluminium oxide crucible, ndi zina., kutumikira zamagetsi, za ceramic, mankhwala ndi mafakitale ena. Kuyambira kukhazikitsidwa kwake mu 2005, kampaniyo yadzipereka kupereka makasitomala zinthu zabwino kwambiri ndi ntchito. Ngati mukuyang'ana zapamwamba gamma alumina ufa, chonde omasuka kulankhula nafe. ([email protected])
Tags: Alumina Wamphamvu,aluminiyamu,kugwiritsa ntchito alumina ufa

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