Phello ea sintering ho thepa ea zirconia ceramics

Phello ea sintering ho thepa ea zirconia ceramics

Joaloka mofuta oa thepa ea ceramic, zirconium e na le matla a phahameng, boima bo phahameng, ho hanyetsa ho apara hantle, ho hanyetsa acid le alkali, ho hanyetsa mocheso o phahameng le lisebelisoa tse ling tse babatsehang. Ntle le ho sebelisoa haholo lefapheng la indasteri, ka nts'etsopele e matla ea indasteri ea meno ea meno lilemong tsa morao tjena, li-ceramics tsa zirconia li fetohile lisebelisoa tse ka bang teng ka ho fetesisa tsa meno mme li hohetse tlhokomelo ea bafuputsi ba bangata.

Ts'ebetso ea li-ceramics tsa zirconia e tla angoa ke lintlha tse ngata, kajeno re bua ka phello ea sintering ho tse ling tsa thepa ea zirconia ceramics.

Sintering mokhoa

Mokhoa o tloaelehileng oa sintering ke ho futhumatsa 'mele ka mahlaseli a mocheso, mocheso oa mocheso, mocheso oa mocheso, e le hore mocheso o tsoa holim'a zirconia ho ea ka hare, empa mocheso oa mocheso oa zirconia o mpe ho feta oa alumina le lisebelisoa tse ling tsa ceramic. E le ho thibela ho phunyeha ho bakoang ke khatello ea mocheso, lebelo la ho futhumatsa le tloaelehileng le lieha 'me nako e telele, e leng se etsang hore potoloho ea tlhahiso ea zirconia e be telele le theko ea tlhahiso e phahame. Lilemong tsa morao tjena, ho ntlafatsa theknoloji ea ts'ebetso ea zirconia, ho khutsufatsa nako ea ts'ebetso, ho fokotsa litšenyehelo tsa tlhahiso, le ho fana ka lisebelisoa tse phahameng tsa lisebelisoa tsa ceramic tsa zirconia li fetohile sepheo sa lipatlisiso, 'me ha ho pelaelo hore microwave sintering ke mokhoa o tšepisang oa sintering.

Ho fumanoe hore microwave sintering le aatmospheric pressure sintering ha li na phapang e kholo tšusumetsong ea semi-permeability le ho se mamelle. Lebaka ke hore boima ba zirconia bo fumanoeng ka microwave sintering bo tšoana le ba sintering e tloaelehileng, 'me ka bobeli ke sintering e teteaneng, empa melemo ea microwave sintering ke mocheso o tlaase oa sintering, lebelo le potlakileng le nako e khutšoanyane ea sintering. Leha ho le joalo, lebelo la ho phahama ha mocheso oa khatello ea sepakapaka e ea lieha, nako ea sintering e telele, 'me nako eohle ea sintering e batla e le 6-11h. Ha ho bapisoa le sintering e tloaelehileng ea khatello, microwave sintering ke mokhoa o mocha oa sintering, o nang le melemo ea nako e khutšoanyane ea sintering, e sebetsang hantle haholo le ho boloka matla, 'me e ka ntlafatsa microstructure ea lirafshoa.

Litsebi tse ling li boetse li lumela hore zirconia ka mor'a microwave sintering ka boloka ho feta metastable tequartet mohato, mohlomong hobane microwave futhumatsang ka potlako ka finyella densification ka potlako ea lintho tse bonahalang tse ka mocheso o ka tlaase, boholo ba lijo-thollo ke tse nyenyane tse le junifomo ho feta ea tloaelehileng khatello ea sintering, ka tlaase ho feta. boholo ba phetoho ea karolo ea bohlokoa ea t-ZrO2, e loketseng ho boloka ka hohle kamoo ho ka khonehang boemong bo tsitsitseng mocheso oa kamore, ho ntlafatsa matla le ho tiea ha ceramic. lisebelisoa.

Habeli sintering tshebetso

Li-ceramics tse entsoeng ka sintered zirconia li ka sebetsoa feela ka lisebelisoa tsa ho itšeha tsa emery ka lebaka la boima bo phahameng le matla, 'me litšenyehelo tsa ho sebetsa li phahame ebile nako e telele. E le ho rarolla mathata a ka holimo, ka linako tse ling zirconia ceramics e tla sebelisoa habeli sintering tshebetso, ka mor'a hore ho thehoe 'mele oa ceramic le sintering ea pele, mochine oa amplification oa CAD/CAM ho sebopeho se lakatsehang, ebe o sintering mocheso oa ho qetela oa sintering ho etsa. thepa e teteaneng ka botlalo.

Ho fumanoa hore mekhoa e 'meli ea sintering e tla fetola kinetics ea sintering ea zirconia ceramics,' me e tla ba le liphello tse itseng ho sintering density, thepa ea mechine le microstructure ea zirconia ceramics. Thepa ea mochini oa li-ceramics tsa zirconia tse chekiloeng hang ha e le motenya li molemo ho feta tse chesitsoeng habeli. Matla a ho kobeha a biaxial le ho tiea ha ho robeha ha lirafshoa tsa zirconia tse entsoeng ka machane tse kentsoeng hang ha li kopane li phahame ho feta tse chekiloeng habeli. Mokhoa oa ho robeha oa li-ceramics tsa sintered zirconia tsa mantlha ke transgranular/intergranular, 'me sekhahla sa crack se batla se otlolohile. Mokhoa oa ho robeha oa li-ceramics tse sintered tse peli tsa zirconia haholo-holo ke ho robeha ka har'a granular, 'me mokhoa oa ho phatloha o boima le ho feta. Thepa ea mofuta oa fracture e kopaneng e betere ho feta mokhoa o bonolo oa ho robeha ha intergranular.

Sintering vacuum

Zirconia e lokela ho sintered sebakeng sa vacuum, ts'ebetsong ea sintering e tla hlahisa palo e kholo ea li-bubble, 'me sebakeng sa vacuum, li-bubble li bonolo ho tsoa sebakeng se entsoeng ka ho qhibilihisoa ha' mele oa porcelain, ho ntlafatsa letsoalo la zirconia, ka tsela eo ho eketsa semi-permeability le thepa ea mechine ea zirconia.

Sekhahla sa mocheso

Ts'ebetsong ea sintering ea zirconia, e le ho fumana ts'ebetso e ntle le liphello tse lebeletsoeng, tekanyo e tlaase ea ho futhumatsa e lokela ho amoheloa. Sekhahla se phahameng sa ho futhumatsa se etsa hore mocheso oa ka hare oa zirconia o se ke oa lekana ha o fihla mocheso oa ho qetela oa sintering, o lebisang ho ponahalo ea mapetsong le ho thehoa ha li-pores. Liphello li bontša hore ka ho eketseha ha tekanyo ea mocheso, nako ea crystallization ea likristale tsa zirconia e khutsufatsoa, ​​khase e pakeng tsa likristale e ke ke ea lokolloa, 'me porosity ka hare ho likristale tsa zirconia e eketseha hanyenyane. Ka keketseho ea mocheso oa mocheso, karolo e nyenyane ea kristale ea monoclinic e qala ho ba teng karolong ea tetragonal ea zirconia, e tla ama thepa ea mechine. Ka nako e ts'oanang, ka ho eketseha ha sekhahla sa ho futhumatsa, lijo-thollo li tla polarized, ke hore, ho phelisana ha lijo-thollo tse khōloanyane le tse nyenyane ho bonolo. Sekhahla sa ho futhumatsa butle se etsa hore ho thehoe lijo-thollo tse tšoanang, e leng se eketsang semipermeability ea zirconia.