Alumina e matlafalitsoeng ke Zirconia
Zirconia e tsitsitse alumina (ZTA) ke thepa e tsoetseng pele ea ceramic e sebelisoang haholo ho li-valve seal, lihlahla, likarolo tsa pompo le lisebelisoa tsa ho itšeha ka lebaka la matla a eona le botsitso ba lik'hemik'hale – joalokaha ho pakoa ke bokhoni ba eona ba ho mamella meroalo e boima ntle le ho senyeha ho hoholo.
ZTA e na le khanyetso e tsotehang ea mocheso oa mocheso 'me e khona ho mamella liphetoho tsa tšohanyetso tsa mocheso, hammoho le ho fetoha ha mocheso ka potlako. Tsoela pele ho bala ho ithuta haholoanyane ka thepa ea eona ea mochini!
Ho thatafala
Zirconia e ekelitsoeng ho matrix ea alumina e eketsa boima ba eona, fracture toughness le flexural strength ha e ntse e eketsa ho hana ho tsofala le khoholeho. Mochini o amehang hangata ke phetoho ea mekhahlelo e lateloang ke sebopeho sa microcrack empa e kanna ea kenyelletsa likhopolo tsa mohopolo oa khatello ea maikutlo joalo ka ha ho sebetsa..
Metastable zirconia tetragonal precipitates e etsang phallo e ntle ka har'a matrix ea alumina e ka fetoha ka tšohanyetso ho ba mefuta ea monoclinic ha khatello ea bona e tlosoa nakong ea phatlalatso ea crack., ho fana ka matla kgahlanong le maemo a kgatello ya maikutlo ho kgannang ho ata ha crack.
ZTA ceramic e na le boima bo phahameng ba ho robeha le ho thatafala ha ho bapisoa le lirafshoa tse ling tsa boenjiniere tse thehiloeng ho oxide, hammoho le matla a mokhathala a makhetlo a mabeli a Y-TZP. Hakalo, thepa ea eona e etsa hore e be e loketseng bakeng sa likopo tse hlokang ho hanyetsa ho feteletseng ho apara, inertness ea lik'hemik'hale le khohlano e tlase hammoho le matla a phahameng le ho satalla.
Flexural Matla
Li-ceramics tsa ZTA li ka etsoa ka ho fetola karo-karolelano ea yttria e tsitsitseng zirconia (Y-TZP) ka har'a matrix a alumina ka ho tobetsa ho chesang ha isostatic, ho ntlafatsa ho thatafala ha fracture ho thata-ho kopanya matla a feto-fetohang a fellang ka ho hanyetsa mokhathala o sa tšoaneng ho feta lirafshoa tse tsoetseng pele tsa theknoloji..
Metastable Y-TZP ka har'a matrix ea alumina e fella ka ho thehoa ha likaroloana tsa phetoho ea tetragonal-monoclinic tse eketsang ho tiea ha fracture ka ho satalla ha mohato. (Clausen 1976). Ho khetha ho tšela mapetsong, li-agglomerate tsena tsa phetoho li tla hatella sebaka se ka pele ho phallo ea pele le ho fokotsa tsoelo-pele ea eona, qetellong e eketsa ho tiea ha fracture.
Sebopeho sena sa thepa se lebisitse ho thehoeng ha metsoako ea alumina-zirconia e kang BIOLOX Delta., e sebelisoang haholo bakeng sa ho nkela letheka ka kakaretso le likarolo tse ling tsa masapo tse jereng moroalo. Ceramic biomaterial ena e na le khanyetso e ikhethang ea ho apara, inertness ea lik'hemik'hale ka mocheso oa kamore, ho hanyetsa mocheso oa mocheso le ho se sebetse hantle ha lik'hemik'hale maemong 'ohle a mocheso.
Khanyetso ea Corrosion
Iketsetse ka lik'hemik'hale 'me e hanyetsa mocheso o phahameng le ho apara, e fana ka tshebetso e phahameng ha e bapisoa le 99 alumina ceramics hape e na le litšenyehelo tse ngata.
Zirconia e boetse e ithorisa ka matla a tsotehang a ho tsitsisa, flexural le elasticity thepa le biocompatibility – ho etsa hore e be e loketseng bakeng sa ts'ebeliso ea bongaka joalo ka ho fetola letheka. Ka lebaka la phetoho toughening tlas'a maemo a khatello ea kelello, zirconia particles fetoha ho tloha metastable tetragonal foromo ea monoclinic, ho thusa ho koala mapetsong ka mokhoa o atlehileng ha o ntse o eketsa ho tiea ha fracture.
CeramTec (Delta ea Biolox) e rekisa motsoako oa alumina-zirconia moo zirconia e sa tsitsang e lulang e le mothating oa tetragonal ho laola phetoho ena le ho fana ka lintlha tse fokolang le ho kheloha ha crack., ho ntlafatsa ho tiea ha matrix a alumina. Likahare tsa Zirconia tsa thepa li ka fetoloa ka mokhoa oa ho lokisa phofo le mekhoa ea densification.
Thermal Shock Resistance
Zirconia e kenyellelitsoeng ho matrix ea alumina ea mantlha nakong ea sintering e ka matlafatsa matla le ho tiea ha eona haholo, ho theha se tsejoang e le ZTA (Alumina e matlafalitsoeng ke Zirconia), e sebetsang hantle ho feta lirafshoa tsa alumina tse tloaelehileng lits'ebetsong tsa mochini le tsa liaparo.
Zirconia toughened alumina e tsebahala ka thepa ea eona e ikhethang joalo ka boima bo phahameng bo chesang le matla a rapture., inertness ea lik'hemik'hale ka mocheso oa kamore, likhahla tse tlase tsa katoloso ea mocheso le khanyetso e ntle haholo ea mocheso oa mocheso – thepa e loketseng bakeng sa ho sila likarolo hammoho le ho roala likarolo tse hlokang mekhoa e pholileng.
CeramTec e rekisa ZTA e bitsoang Biolox delta e nang le matrix ea alumina e nang le likaroloana tsa Y-TZP tse qhalakaneng. (17 boima/wt%) le liplatelete tsa strontium aluminate (0.5 boima/wt%), Ho fana ka motsoako o sebetsang oa mekhoa ea phetoho ea mohato oa tetragonal-to-monoclinic le mekhoa ea ho kheloha ho senya ho fana ka matla a ntlafetseng., e etsang hore sena se be se loketseng bakeng sa lits'ebetso tsa mantlha tsa THA holim'a libaka tse nang le botšehali.
Insulation ea Motlakase
Zirconia-toughened alumina e ka mamella ts'oaetso ea mocheso ntle le ho phatloha kapa ho robeha tlas'a liphetoho tsa tšohanyetso tsa mocheso., ka lebaka la likaroloana tse qhalakaneng tsa alumina tse hasaneng ka har'a matrix a eona a monyang matla a mocheso le ho hlahisa khatello ea maikutlo e thibelang ho robeha..
Alumina-zirconia ceramic e teteaneng ho feta ea eona e hloekileng ea zirconia, e etsa hore e be e loketseng bakeng sa lisebelisoa tsa ho kenya motlakase. Ho feta moo, katoloso ea eona e tlase ea mocheso ho feta zirconia e etsa hore e tšoanelehe bakeng sa likarolo tse hlokang ho pholile.
Phetoho ea toughening ea metsoako ea Alumina-zirconia e fana ka melemo e meng; Mona, lijo-thollo tsa zirconia ka har'a matrix a alumina li kena mohatong o tsitsitseng moo lijo-thollo tsa tsona li fetohang ho tloha ho tetragonal ho ea ho meaho ea monoclinic., ka hona ho fokotsa ho phunyeha ho bakoang ke khatello ea kelello ka ho eketsa khanyetso khahlanong le abrasion le tšusumetso. Alumina toughened zirconia hangata e hlaha ka karabelo ea pyrophoric e kenyelletsang Zirconium(IV) oxide e octahydrate, Aluminium Nitrate Nanohydrate Triethylamine le HNO3(Asiti ea nitric); ho eketsa boholo ba likaroloana ho thusa ho hasana ha lijo-thollo tsa zirconia tse metastable.