Fuskar Alumina (Aluminum Oxide): Nanoscale Architecture da Multifunctional Applications of a High-Surface- Area Ceramic Material gamma alumina foda

1. Magana, Tsarin tsari, da Muhimman Fasalolin Fumed Alumina

1.1 Ƙirƙirar Injiniya da Ƙirƙirar Tsarin Aerosol-Phase

(Fuskar Alumina)

Fuskar alumina, Hakanan ana kiransa alumina pyrogenic, babban tsarki ne, nanostructured nau'i na haske nauyi aluminum oxide (Al ₂ O SIX) wanda aka ƙirƙira ta hanyar tsarin haɗaɗɗun tururi-lokaci mai zafi.

Sabanin alumina na al'ada na yau da kullun ko haɗe-haɗe, Fumed alumina an ƙirƙira shi a cikin reactor na harshen wuta inda abubuwan da ke ɗauke da aluminum– yawanci ƙananan nauyin aluminum chloride (AlCl hudu) ko abubuwan organoaluminum– suna ƙonewa a cikin harshen wuta na hydrogen-oxygen a matakan zafin jiki da ke wucewa 1500 ° C.

A cikin wannan yanayi mai tsanani, precursor yana canzawa kuma yana jurewa hydrolysis ko oxidation don samar da haske mai nauyi aluminum oxide tururi., wanda da sauri ya haɗa kai tsaye zuwa maɓalli na nanoparticles yayin da iskar gas ke sanyi.

Waɗannan ɓangarorin da aka fara yin karo suna haɗuwa tare a matakin iskar gas, kafa sarka-kamar tara tara da aka gudanar da juna ta m covalent shaidu, yana kaiwa zuwa ga rashin ƙarfi sosai, tsarin cibiyar sadarwa mai girma uku.

Dukkanin tsarin yana faruwa a cikin fitowar millise seconds, haifar da hukunci, m foda tare da na kwarai tsarki (akai-akai > 99.8% Al ₂ O BIYAR) da kuma gurɓataccen ion na gefe, yin shi manufa domin high-yi masana'antu da lantarki aikace-aikace.

Ana tattara samfurin da aka samo ta hanyar tsarkakewa, gabaɗaya yin amfani da sintered karfe ko tace yumbu, kuma bayan haka deagglomerated zuwa digiri daban-daban dangane da aikace-aikacen da aka yi niyya.

1.2 Nanoscale Morphology da Surface Area Chemistry

Ma'anar sifofin alumina fumed sun dogara da salon nanoscale da kuma saman musamman, wanda yawanci ya bambanta daga 50 ku 400 m ²/g, dangane da yanayin samarwa.

Girman juzu'i na farko yawanci suna tsakanin 5 kuma 50 nanometers, kuma saboda tsarin harshen wuta, waɗannan ragowa amorphous ne ko kuma suna nuna yanayin alumina na wucin gadi (kamar γ- ko δ-Al ₂ O BIYU), sabanin α-alumina mai tsaro na thermodynamically (corundum) lokaci.

Wannan tsarin metastable yana ba da gudummawa ga mafi girman reactivity na yanki da aikin sintiri wanda ya bambanta da siffofin alumina crystalline..

Wurin sararin samaniya na alumina mai ƙura yana da yawa a cikin hydroxyl (-OH) ƙungiyoyi, wanda ke faruwa daga aikin hydrolysis a lokacin haɗuwa da kuma bayyanar da shi zuwa danshi na yanayi.

Wadannan hydroxyls na sararin samaniya suna taka muhimmiyar rawa wajen tabbatar da rarrabuwar samfur, hankali, da kuma hulɗa tare da kwayoyin halitta da matrices na inorganic.

( Fuskar Alumina)

Dogaro da jiyya ta sama, Fumed alumina na iya zama hydrophilic ko bayar da hydrophobic ta hanyar silanization ko wasu canje-canjen sinadarai daban-daban, yana ba da damar dacewa da dacewa tare da polymers, guduro, da kaushi.

Ƙarfin yanki mai tsayi da ƙuri'a kuma yana sanya fumed alumina ya zama kyakkyawan fata na talla, catalysis, da rheology gyara.

2. Matsayin Aiki a Gudanar da Rheology da Tsabtace Yaduwa

2.1 Ayyukan Thixotropic da Tsarin Tsare-tsare

Daya daga cikin mafi fasaha gagarumin aikace-aikace na fumed alumina shine ikonsa don canza kaddarorin mazaunin rheological na tsarin ruwa., musamman a karshen, adhesives, tawada, da kayan hadewa.

Lokacin tarwatsewa a rage yawan lodi (kullum 0.5– 5 wt%), Fumed alumina yana samar da hanyar sadarwa mai ruɗi ta hanyar haɗin gwiwar hydrogen da hulɗar van der Waals a tsakanin tarin rassa., isar da tsari mai kama da gel zuwa in ba haka ba ruwa mai ƙarancin danko.

Wannan hanyar sadarwa tana karyewa ƙarƙashin damuwa mai ƙarfi (misali, a lokacin goga, fesa, ko hadawa) da kuma gyara idan aka kawar da tashin hankali, Halin da aka sani da thixotropy.

Thixotropy ya zama dole don karewa daga faɗuwa a madaidaiciyar ƙarewa, hana pigment daidaitawa a cikin fenti, da kiyaye kamanni a cikin nau'ikan nau'ikan abubuwa da yawa a cikin sararin ajiya.

Sabanin masu kauri masu girman micron, Fumed alumina yana cimma waɗannan tasirin ba tare da ƙara yawan ɗankowa gabaɗaya a cikin jihar da ake aiki ba, kare workability da gama saman inganci.

Bugu da kari, dabi'ar sa ba ta dabi'a tana ba da tabbacin kwanciyar hankali na dogon lokaci tare da lalata ƙwayoyin cuta da ruɗuwar zafi, outshining kuri'a na Organic thickeners a cikin matsananci saituna.

2.2 Dabarun Watsawa da Ƙarfafa Daidaituwa

Samun daidaitaccen tarwatsawar alumina yana da mahimmanci don haɓaka aikin sa da kuma nisantar lahani na agglomerate..

Saboda da high surface da m interparticle matsi, fumed alumina sau da yawa yana kula da samar da agglomerates masu wuya waɗanda ke da wuya a lalata ƙasa ta amfani da haɗakar gargajiya.

Haɗe-haɗe mai ƙarfi, ultrasonication, ko milling uku-rodi suna yawanci aiki don deagglomerate foda da kuma haɗa shi a cikin rundunar matrix.

Surface-magani (hydrophobic) Halayen suna nuna mafi kyawun dacewa tare da kafofin watsa labarai marasa iyaka kamar resin epoxy, polyurethane, da kuma silicone mai, rage ƙarfin da ake buƙata don yaduwa.

A cikin tsarin tushen ƙarfi, Zaɓin polarity mai ƙarfi dole ne a daidaita su da sinadarai na alumina don yin wasu wetting da tsaro..

Daidaitaccen tarwatsawa ba kawai yana haɓaka ikon sarrafa rheological ba amma kuma yana haɓaka tallafin injiniyoyi, tsabtar gani, da tsaro na thermal a cikin fili na ƙarshe.

3. Taimako da Haɓakawa A Haƙiƙa a cikin Haɗin Samfura

3.1 Ƙarfafa Ginin Makanikai da Zazzabi

Fumed alumina yana aiki azaman ƙari mai yawa a cikin polymer da mahadi yumbu, ba da gudummawa ga ƙarfafa injiniyoyi, thermal kwanciyar hankali, da gidajen katanga.

Lokacin da kyau-watse, ƙananan nano-sized bits da tsarin hanyar sadarwar su suna ƙuntata motsin sarkar polymer, inganta yanayin, m, da juriya mai rarrafe na matrix.

A cikin tsarin epoxy da silicone, Fumed alumina yana inganta haɓakar zafin jiki kaɗan yayin da yake inganta tsaro mai ƙarfi a ƙarƙashin keken thermal.

Babban wurin narkewar sa da rashin kuzarin sinadarai suna ba da damar abubuwan haɗin gwiwa su riƙe mutunci a matakan zafin jiki da aka haɓaka, yin su dace da dijital encapsulation, abubuwan haɗin sararin samaniya, da gaskets masu zafin jiki.

Bugu da kari, kauri cibiyar sadarwa kafa ta fumed alumina iya aiki a matsayin yaduwa cikas, rage raguwa a cikin tsarin iskar gas da danshi– da amfani a cikin aminci coverings da marufi kayayyakin.

3.2 Insulation Electric da Dielectric Performance

Ko da kuwa tsarin halittarsa ​​na nanostructured, Fumed alumina yana kiyaye fitattun gidaje masu kariya na lantarki musamman na aluminum oxide mai nauyi.

Tare da juriya juriya ta wuce gona da iri 10 ¹² Ω · cm da ƙarfin wutar lantarki na kV/mm da yawa, ana yin amfani da shi a ko'ina cikin samfuran rufin ƙarfe mai ƙarfi, ciki har da katsewar talabijin na USB, sauya kayan aiki, da kuma bugu na kewayawa (PCB) laminates.

Lokacin da aka haɗa kai tsaye cikin siliki roba ko kayan epoxy, Fumed alumina ba wai kawai yana ƙarfafa kayan ba amma yana taimakawa wajen watsar da ɗumi da rage fitar da wani ɓangare., inganta dadewa na tsarin rufin lantarki.

A cikin nanodielectrics, da ke dubawa a tsakanin fumed alumina barbashi da polymer matrix taka muhimmiyar rawa a tarko masu samar da farashi da kuma canza wutar lantarki filin wurare dabam dabam., kawo ingantaccen juriya na gazawa da rage asarar dielectric.

Wannan injiniyan tsaka-tsaki shine muhimmin mahimmancin mayar da hankali ga ci gaban samfuran rufi na gaba don na'urorin lantarki da tsarin sabunta makamashi..

4. Manyan Aikace-aikace a cikin Catalysis, goge baki, da kuma Emerging Technologies

4.1 Taimako na Katalytic da Fahimtar Yanki

Babban saman da farfajiyar ƙasa hydroxyl kauri na fumed alumina ya sa ya zama ingantaccen samfurin tallafi don abubuwan haɓakawa daban-daban..

An yi amfani da shi don tarwatsa nau'in karfe mai aiki kamar platinum, palladium, ko nickel a cikin halayen da suka shafi hydrogenation, dehydrogenation, da kuma gyaran ruwa na hydrocarbon.

Matakan alumina na wucin gadi a cikin fumed alumina suna ba da ma'auni na matakin acidity da kwanciyar hankali na thermal., taimakawa tare da ƙaƙƙarfan hulɗar tallafin ƙarfe-ƙarfe waɗanda ke guje wa ɓarna da haɓaka ayyukan haɓakawa.

A cikin catalysis muhalli, Ana amfani da tsarin tushen alumina fumed don kawar da mahadi na sulfur daga iskar gas (hydrodesulfurization) kuma a cikin rushewar abubuwa na halitta marasa ƙarfi (VOCs).

Ƙarfin sa don haɗawa da kunna kwayoyin halitta a cikin nanoscale mai amfani da mu'amala yana sanya shi a matsayin kyakkyawan fata don ilimin kimiyyar kore da aikin injiniya mai dorewa..

4.2 Madaidaicin Ƙirar Ƙarfafawa da Ƙarshen Yankin Sama

Fuskar alumina, musamman a cikin nau'ikan sarrafa colloidal ko submicron, ana amfani dashi a cikin madaidaicin slurries masu haskakawa don ruwan tabarau na gani, semiconductor wafers, da kafofin watsa labaru na sararin samaniya na magnetic.

Matsakaicin girman girmansa, kayyade ƙarfi, da rashin kuzarin sinadarai yana ba da damar samun kyakkyawan wuri mai kyau da aka kammala tare da ƙarancin lalacewar ƙasa.

Lokacin da aka haɗa tare da pH-daidaitacce mafita da kuma masu rarraba polymeric, Fumed tushen alumina slurries isa ga nanometer-matakin surface roughness, m ga babban aiki na gani da kayan lantarki.

Aikace-aikace masu tasowa sun ƙunshi tsara tsarin injiniya-kanikanci (CMP) a cikin m semiconductor samar, inda ainihin farashin cire kayan abu da daidaiton saman ke da mahimmanci.

Abubuwan amfani na al'ada da suka gabata, Ana bincika fumed alumina a cikin ajiyar makamashi, ji raka'a, da kuma kayayyakin kare wuta, inda tsaro na thermal da aikinta na saman ke ba da fa'idodi daban-daban.

Don kammalawa, fumed alumina yana wakiltar haɗakar aikin injiniya na nanoscale da sassauci mai amfani.

Daga asalin harshen harshensa zuwa matsayinsa na sarrafa rheology, haɗakar ƙarfafawa, catalysis, da madaidaicin masana'anta, wannan babban aiki na samfurin yana ci gaba da ba da damar fasaha a fadin fannonin fasaha daban-daban.

Kamar yadda buƙatun ke girma don samfuran ci-gaba tare da keɓancewar ƙasa da kaddarorin girma, Fumed alumina ya kasance mai mahimmanci mai ba da damar tsarin masana'antu da na lantarki na gaba.

Mai bayarwa

Abubuwan da aka bayar na Alumina Technology Co., Ltd., Ltd mayar da hankali kan bincike da haɓakawa, samarwa da tallace-tallace na aluminum oxide foda, aluminum oxide kayayyakin, aluminum oxide crucible, da dai sauransu., hidima da kayan lantarki, tukwane, sinadarai da sauran masana'antu. Tun lokacin da aka kafa shi a 2005, kamfanin ya himmatu wajen samarwa abokan ciniki mafi kyawun kayayyaki da sabis. Idan kana neman high quality gamma alumina foda, don Allah a ji daɗin tuntuɓar mu. ([email protected])
Tags: Fuskar Alumina,alumina,alumina foda amfani

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