zirconia toughened alumina e pakile thepa ea eona e phahameng ea mochini ha e bapisoa le monolithic zirconia, ho kenyeletsoa ho tiea ha fracture le matla a flexural. Botsitso ba ZTA bo bakoa ke mohato oa eona oa matrix o sireletsang le ho thibela phetoho ea lijo-thollo tsa tetragonal zirconia., ho e thusa ho mamella ho senyeha ha maemo tlas'a in-vivo hydrothermal.
Flexural Matla
Ka ho eketsa zirconia ho lirafshoa tsa alumina, zirconia toughened alumina e thehoa. Boitsebiso bona bo na le matla a phahameng a flexural le ho tšoarella ha mechine maemong a e batlang, hape e hanela ho bola ha lik'hemik'hale hammoho le ho pepesehela maro a 'mele.
zirconia toughened alumina e ka mamella ho fetoha ha mocheso ka potlako ka lebaka la likaroloana tsa zirconia tse hasaneng ka har'a matrix ea alumina e monyang matla a mocheso le ho theha khatello ea maikutlo ho thibela ho phatloha., ho etsa hore e loketse ho sebelisoa lits'ebetsong tse fapaneng tsa indasteri joalo ka likarolo tsa sebōpi le lienjineri tsa turbine tsa mouoane.
Ceramic ena e kopantsoeng e kopanya litšoaneleho tse tsotehang tsa alumina le zirconia ho fana ka matla a eketsehileng le ho hanyetsa mocheso oa mocheso., ka thatafalo e fetang, matla a flexural, ho qhetsoha ho thata le ho tsubella hofetang 99% aluminium e hloekileng ho ya ka boima, ho ba thata le ho ikgantsha.
Ho thatafala ha Fracture
Zirconia e ntlafatsa ho tiea ha fracture ea lirafshoa tsa alumina ka ho fetola ka thata. Ha o otloa, metastable yttrium-stabilised zirconia e fetoha meaho ea kristale ea monoclinic e hlahisang khatello ea maikutlo e thibelang ho ata..
Zirconia toughened alumina ke thepa e loketseng ho theha lisebelisoa tsa ho itšeha ka lebaka la ho thatafala ha eona, botsitso ba mocheso le ho hanyetsa ho ferekana. Ho feta moo, thepa ea eona e phahameng ea mechine e tlatsetsa haholo ho tšoarella ha eona le ho tšepahala.
ZTA e hlahisoang ka gelcasting e na le motsoako o ikhethang oa matla a feto-fetohang, ho qhetsoha ho thata, biocompatibility le mocheso / corrosion resistance e etsang hore e tšoanelehe bakeng sa ho buuoa ka letheka. Ka lits'ebetso tsa gelcasting, hoa khonahala ho lokisa maemo a eona a thata-thata-ho thatafala, ka ho fetola maemo a slurry a tiileng., botenya ba hlobo kapa liparamente tsa mocheso oa sintering ho eketsa sephetho.
Stress-Strain Curves
zirconia toughened alumina material e ithorisa ka matla a phahameng le ho hanyetsa ho apara, mmoho le ho tiya ho ikgethang bakeng sa ho tshehetsa meroalo e boima ntle le ho holofala tlasa kgatello. Ho feta moo, e na le khanyetso e ntle ea mocheso e e nolofalletsang ho mamella ho fetoha ha mocheso ka tšohanyetso ntle le ho senyeha..
Likahare tsa Zirconia tse ka holimo ho moeli o itseng li eketsa ho senyeha ha botsofali ka li-microcracks tse entsoeng nakong ea pholileng ka mor'a ho sintering tse sebetsang e le litsela tse khethehileng tsa ho kenella ha metsi ka har'a thepa ea ceramic., e lebisang ho bopjoa bo bonyenyane nakong ya phodiso e sebetsang joalo ka ditsela tse kgethehileng bakeng sa ho kena le ho nama ho yona. Ka lehlakoreng le leng, ha ka tlase ho monyako ona, likaroloana tsa zirconia li fetoha khatello ea maikutlo ho tloha karolong ea tetragonal ho ea monoclinic phase e fokotsang ho senyeha ha botsofali..
Matla a tšepe
Zirconia toughened alumina ke thepa e thata le e tšoarellang e nang le khanyetso e ntle ea ho roala le thepa ea botsitso ba mocheso, ho etsa hore e tshwanele dikarolo tse hlokang ho phodiso. Ho phaella moo, libaka tse tsitsitseng tse kang tsena li fana ka taolo ea mocheso hammoho le ho hanyetsa likhohlano ho li etsa khetho e nepahetseng ea thepa..
Tlas'a khatello ea maikutlo, ZTA e na le phetoho ea mohato ho tloha ho tetragonal ho ea ho monoclinic e thibelang ho ata le ho eketsa ho tiea ha fracture., empa liphuputso tse ling li bontša hore ho eketseha ha zirconia tse sa tsitsang ho lebisa ho fokotseng matla a ho tsitsa.
Li-ceramics tsa ZTA hangata li na le 10%-20% zirconia, e lumellang hore e lokisetsoe ka ho khetheha bakeng sa ts'ebeliso e 'ngoe le e' ngoe. ZTA e lumellana le biocompatible, e hanyetsanang le mocheso, e thibelang ho bola, e thata ho lekana ho mamella khatello, mefuta e meng e theko e tlaase ho li-ceramics tse hloekileng tsa zirconia 'me e khona ho mamella mocheso o phahameng ntle le ho senyeha. Baetsi ba li-valve seal hangata ba e khetha ka lebaka la bokhoni ba eona ba ho hanyetsa kutu le ho ts'oara khatello. – litšoaneleho tsohle li loketse lisebelisoa tsa tiiso ea valve.
Matla a Tšusumetso
zirconia toughened alumina ha e na kutu haholo ebile e na le matla a ikhethang a mochini, ho etsa hore li tšoanelehe bakeng sa lits'ebetso tse hlokang boima le boima ka nako e le 'ngoe. Ho feta moo, ZTA e fana ka poloko ea litšenyehelo holim'a lirafshoa tse hloekileng tsa zirconia.
Ho kopanya alumina le zirconia ho etsa ceramic e nang le matla a phahameng a ho feto-fetoha, ho qhetsoha ho thata, le ho apara ho hanyetsa ho feta alumina e hloekileng. E ka mamella meroalo e phahameng le litlamorao 'me hangata e sebelisoa e le ntlafatso ho feta alumina e tloaelehileng meralong e hlokang likarolo tse ling..
Phetoho e matla e baka matla ana a eketsehileng; tlasa maemo a kgatello ya maikutlo, likaroloana tsa zirconia li fetoha ho tloha ho tetragonal ho ea ho sebopeho sa monoclinic le ho hola, ho hatella mapetsong a matrix a alumina mme ka hona ho lebisa ho matla a phahameng a flexural ho feta YSZ (Lipalo 6c le d).
Khanyetso ea Corrosion
Motsoako oa ZTA ceramic oa alumina le zirconia o fana ka khanyetso e phahameng ea kutu ha e bapisoa le e hloekileng 99% lisebelisoa tsa aluminium feela, mme e na le boima bo feteletseng, ho qhetsoha ho thata, matla a flexural, le thepa ea boima ho feta baphadisani ba yona.
ZTA e na le ts'ebetso e ikhethang ea ho roala le ho hanyetsa abrasion le ho lumellana ha lik'hemik'hale, e etsa hore e be e loketseng bakeng sa lits'ebetso tsa indasteri tse hlokang ts'ebetso e phahameng ea mochini. Ho feta moo, motsoako oa lisebelisoa o ithorisa ka ho hanyetsa mocheso o matla oa mocheso o lumellang ho fetoha ha mocheso ka potlako ntle le ho senya kapa ho senya.
Likaroloana tsa Zirconia tse kenyellelitsoeng matrix a alumina li eketsa ho tiea ha eona ho robeha ka phetoho e thata., phello e bakoang ke ho hatella likaroloana tsa zirconia tse fetohang ho tloha ho tetragonal ho ea ho meaho ea kristale ea monoclinic ha e pepesehetse khatello ea kelello., ho hlahisa khatello ea maikutlo e thibelang ho ata ha crack le ho eketsa ho tiea ha eona haholo.
Thermal Shock Resistance
zirconia toughened alumina ke ceramic e tsoetseng pele e kopanyang alumina le zirconia. Ho theha ZTA, zirconia e hlahisoa ka har'a matrix ea alumina e kholo pele e sinter bakeng sa matla a eketsehileng le ho hanyetsa mocheso oa mocheso holim'a lirafshoa tsa setso tsa alumina.; ho feta moo e ithorisa ka thatafala e phahameng, matla a flexural, le ho teteana hofeta molekane oa eona.
Mokhoa o thata oa ZTA o kenyelletsa phetoho e bakoang ke khatello ea maikutlo ho tloha ho tetragonal ho ea ho monoclinic zirconia particle crystal structures., ho eketsa boima ba ho robeha ha o ntse o e sireletsa ho tsukutleha ha mocheso le ho honyeha ka mochini. zirconia toughened alumina e lumellana haholo le lintho tse phelang 'me ha e bola ka potlako, e etsa hore e be e loketseng bakeng sa litiiso tsa li-valve. Ho feta moo, matla a eona a phahameng a flexural a e lumella ho mamella khatello ea 'mele ka katleho.