Litšila tse ling tsa liindasteri li bontšoa li le molemo tlhahisong ea lirafshoa tsa mullite.Litšila tsena tsa indasteri li na le li-oxide tse itseng tsa tšepe tse kang silica (SiO2) le alumina (Al2O3).Sena se fa litšila monyetla oa ho sebelisoa e le mohloli oa ho qala oa ho lokisa lirafshoa tsa mullite.Morero oa pampiri ena ea tlhahlobo ke ho bokella le ho lekola mekhoa e fapaneng ea ho lokisa lirafshoa tsa mullite tse sebelisitseng litšila tse fapaneng tsa indasteri joalo ka lisebelisoa tsa ho qala.Tlhahlobo ena e boetse e hlalosa mocheso oa sintering le li-additives tsa lik'hemik'hale tse sebelisoang ho lokisoa le liphello tsa eona.Papiso ea matla a mochini le katoloso ea mocheso oa lirafshoa tse tlalehiloeng tsa mullite tse lokisitsoeng ka litšila tse fapaneng tsa indasteri le tsona li ile tsa rarolloa mosebetsing ona.
Mullite, eo hangata e hlalosoang e le 3Al2O3∙2SiO2, ke thepa e ntle ea ceramic ka lebaka la thepa ea eona e makatsang.E na le sebaka se phahameng sa ho qhibiliha, coefficient e tlase ea katoloso ea mocheso, e na le matla a phahameng mochesong o phahameng, 'me e na le ts'isinyeho ea mocheso le khanyetso ea maqhubu [1].Mehaho ena e sa tloaelehang ea mocheso le mochini e etsa hore thepa e sebelisoe lits'ebetsong tse kang li-refractories, thepa ea ka tlung, li-substrates bakeng sa li-converter tsa catalytic, li-tubes tsa sebōpi le lithebe tsa mocheso.
Mullite e ka fumanoa feela e le liminerale tse haellang Mull Island, Scotland [2].Ka lebaka la boteng ba eona bo sa tloaelehang tlhahong, lirafshoa tsohle tsa mullite tse sebelisoang indastering li entsoe ke motho.Ho entsoe lipatlisiso tse ngata ho lokisa lirafshoa tsa mullite ho sebelisoa li-precursors tse fapaneng, ho qala ka lik'hemik'hale tsa boemo ba indasteri / laboratori [3] kapa liminerale tsa tlhaho tsa aluminosilicate [4].Leha ho le joalo, litšenyehelo tsa lisebelisoa tsena tsa ho qala li theko e boima, tse entsoeng kapa li rafshoa esale pele.Ka lilemo tse ngata, bafuputsi ba ntse ba batla mekhoa e meng ea moruo ea ho kopanya lirafshoa tsa mullite.Ka hona, lingoliloeng tse ngata tsa li-mullite tse nkiloeng litšila tsa indasteri li tlalehiloe.Melemo e meng ea ho sebelisa litšila tsena tsa indasteri ke ho boloka matla le litšenyehelo haeba litšila li ne li ka khelosoa le ho sebelisoa hape e le thepa ea boenjiniere.Ho feta moo, sena se ka boela sa thusa ho fokotsa moroalo oa tikoloho le ho ntlafatsa melemo ea eona ea moruo.
Bakeng sa ho batlisisa hore na litšila tse hloekileng tsa motlakase li ka sebelisoa ho kopanya lirafshoa tsa mullite, litšila tse hloekileng tsa electroceramics tse kopantsoeng le alumina powders le litšila tse hloekileng tsa electroceramics e le lisebelisoa tse tala li bapisoa. thepa ea mullite ceramic e ile ea hlahlojoa.XRD le SEM li ile tsa sebelisoa ho ithuta sebopeho sa mekhahlelo le microstructure.
Liphetho li bonts'a hore litaba tsa mullite li eketsoa ka ho phahamisa mocheso oa sintering, 'me ka nako e ts'oanang bongata ba bongata bo ntse bo eketseha.Lisebelisoa tse tala ke litšila tse hloekileng tsa electroceramics, kahoo ts'ebetso ea sintering e kholoanyane, 'me ts'ebetso ea sintering e ka potlakisoa,' me boima bo boetse bo eketseha.Ha mullite e lokiselitsoe feela ke litšila tsa electroceramics, bongata bo bongata le matla a ho hatella li kholo ka ho fetisisa, porosity e nyenyane ka ho fetisisa, 'me thepa e feletseng ea' mele e tla ba e ntle ka ho fetisisa.
E susumetsoa ke tlhokahalo ea mekhoa e meng e theko e tlaase le e se nang tikoloho, boiteko bo bongata ba lipatlisiso bo sebelisitse litšila tse sa tšoaneng tsa indasteri e le lisebelisoa tsa ho qala ho hlahisa lirafshoa tsa mullite.Mekhoa ea ho lokisa, mocheso oa sintering, le li-additives tsa lik'hemik'hale li 'nile tsa hlahlojoa.Mokhoa o tloaelehileng oa ho lokisa litsela o neng o kenyelletsa ho kopanya, ho tobetsa, le ho etsa sintering ea mullite precursor e ne e le mokhoa o sebelisoang haholo ka lebaka la bonolo le theko e tlaase.Le hoja mokhoa ona o khona ho hlahisa lirafshoa tse nang le porous mullite ceramics, ho bonahala eka porosities ea sephetho sa mullite ceramic ho tlalehoa hore e lula ka tlaase ho 50%.Ka lehlakoreng le leng, ho qhoqhoa ho ile ha bontšoa ho khona ho hlahisa letsopa la mullite le nang le porous haholo, le nang le porosity e bonahalang ea 67%, esita le mocheso o phahameng haholo oa sintering oa 1500 ° C.Ho ile ha etsoa tlhahlobo ea mocheso oa sintering le li-additives tse fapaneng tsa lik'hemik'hale tse sebelisoang tlhahisong ea mullite.Hoa lakatseha ho sebelisa mocheso oa sintering o ka holimo ho 1500 °C bakeng sa tlhahiso ea mullite, ka lebaka la sekhahla se phahameng sa karabelo pakeng tsa Al2O3 le SiO2 ho selelekela.Leha ho le joalo, lintho tse ngata tsa silika tse amanang le litšila tse ka pele li ka lebisa ho deformation kapa ho qhibiliha ha sampuli nakong ea mocheso o phahameng oa mocheso.Ha e le li-additives tsa lik'hemik'hale, CaF2, H3BO3, Na2SO4, TiO2, AlF3, le MoO3 li tlalehiloe e le thuso e sebetsang ea ho theola mocheso oa sintering ha V2O5, Y2O3-doped ZrO2 le 3Y-PSZ li ka sebelisoa ho khothaletsa densification bakeng sa lirafshoa tsa mullite.Ho sebelisa li-additives tsa lik'hemik'hale tse kang AlF3, Na2SO4, NaH2PO4 · 2H2O, V2O5, le MgO ho thusitse ho hōla ha litelu tsa mullite, tse ileng tsa matlafatsa 'mele le ho tiea ha letsopa la mullite.
Nako ea poso: Aug-29-2023