Zirconium oxide le aluminium oxide li kopantsoe hammoho li hlahisa Zirconia Toughened Alumina (ZTA), thepa e ikhethang lits'ebetsong tse ngata. Thepa ea mechine, matla, ho qhetsoha ho thata, elasticity, ho thatafala le ho haneloa ho ananeloa haholo ka thepa ena e entsoeng ka ceramic e leng ea sehlopha sa lihlopha tsa AZ.. ZTA e fetohile khetho e ratoang bakeng sa matla a phahameng a mochini, ho hanyetsa mocheso le ho hanyetsa ho bola.
Ho hlalosa Sebopeho le Sebopeho
Har'a lintho tse ling, Zirconia Toughened Alumina e na le lithollo tsa zirconia tse hasantsoeng ka mokhoa o ts'oanang ka har'a matrix ea alumina.. Ka tloaelo, sena se kenyeletsa 10-20% bophahamo ba ZrO2 ka alumina. Ho itšetlehile ka boholo ba tsona, motsoako oa motsoako o kenya letsoho ho li-ceramics tse nang le likarolo tse ikhethileng ho latela ts'ebeliso e itseng.
Li-blocks tsa kaho: Alumina le Zirconia
Likarolo tse ka sehloohong tse kopantsoeng ho theha ZTA ke alumina le zirconia. Ho feta moo, li-implants tsa masapo li ntse li sebelisa thepa ena ea ceramic e tsejoang ka hore ke Aluminium Oxide (Al2O3) historing ka lebaka la biocompatibility ea eona e ntle hammoho le matla a eona a maholo a mochine le ho hanyetsa ho robeha.
Thepa e 'ngoe e hlahelletseng ea zirconia ke litheko tsa eona tse tlase tsa kutu hammoho le botsitso bo botle ba lik'hemik'hale le matla a phahameng a mochini.. Modulus ea Eona e Mocha e tatellanong e tšoanang ea boholo ka li-alloys tsa tšepe tse sa hloekang.
Kamoo E Etsoang Kateng
Ho hlahisa ZTA ho bolela ho theha lijo-thollo tsa tetragonal-phase zirconia tse ajoang ka mokhoa o ts'oanang ho pholletsa le matrix ea alumina.. Khatello ea kelello ea "crack tip stress" e ka fetola sebopeho sa kristale ea tetragonal hore e be monoclinic 'me kahoo e lebisa ho eketseha ha molumo oa zirconia.. Katoloso e joalo ea molumo e khutlisa kapa e emisa ho hola ha crack e lebisang ho tiea le matla a maholo.
Mechanical Properties ea ZrO2-Al2O3 Ceramics
Ho na le mefuta e mengata e fapaneng ea thepa ea mochini e bonts'itsoeng ke ZTA ho kenyelletsa le boima bo phahameng ho feta li-alumina tse tloaelehileng tse nang le boleng bo ts'oanang., matla a phahameng a feto-fetohang ho feta li-alumina tse tloaelehileng 'me a le tlase ho feta coefficient ea zirconias e tloaelehileng ea li-expansion tsa mocheso (CLTE).
Zirconia Toughened Alumina e na le matla a phahameng a mochini 'me e hanyetsa mocheso ka hona ha e je.. Ka tlase ke tse ling tsa thepa ea ZTA:
Boleng ba Thepa
Foromo ea lik'hemik'hale Zr-Al2O3
Botenya 4.1-4.38 g/cm^3
Ho thatafala 1750-2100 Konopo
Matla a ho hlasimolla 45-49 x 10^6 psi
Matla a Flexure 100-145 ksi
Karolelano ea Poisson 0.26
Ho thatafala ha Fracture 5-7 MPa m^1/2
Coefficient ea Katoloso ea Thermal 8.0-8.1 x 10^-6 1/C
Thermal Conductivity 20.0-21.0 W/mK
Ho hanyetsana le Tšabo 325 °C
Boholo ba Mocheso oa Mosebetsi 1650 °C
Likopo tsa ZrO2-Al2O3 Ceramics
Zirconia Toughened Alumina e sebelisoa lits'ebetsong tse fapaneng joalo ka tse hlokang matla a phahameng le khanyetso ea ho roala. Tsena li kenyelletsa li-valve seal, matsoho, lipiston tsa pompo, ho fafatsa li-nozzles le likarolo tse ling tsa indasteri.
Biocompatibility ea ZTA
Lithutong tse fapaneng, Ho tlalehoa hore ZTA ha e hlahise karabelo e mpe ea linama ha e kengoa, ka hona e etsa hore e be mokhethoa ea loketseng bakeng sa likarolo tse jarang moroalo oa masapo.. Holim'a moo, boimana, ho tiea le matla a bontšitsoeng ke zirconia-alumina ceramics li etsa hore li tšoanele likarolo tse jarang moroalo oa masapo..
ZTA ho Hip Arthroplasty
Ho bile le lipuisano tse ngata mabapi le lirafshoa tse kang alumina, zirconia le zirconia alumina e thata (ZTA) e le lisebelisoa tse loketseng ho hip arthroplasty . Melemo ena ea ZTA e ile ea finyelloa ntle le ho kenyelletsa mathata a amanang le yttria-stabilized zirconia e bonts'ang thepa e phahameng ea mochine kapa alumina e nang le inertness e phahameng..
ZTA ka Knee Arthroplasty
Hangata, meralo ea ho kenngoa ha ceramic bakeng sa arthroplasty eohle ea lengole (TKA) li entsoe molemong oa ho sebetsana le taba ea ho kula e ka bang teng ho bakuli ha likarolo tsa sejoale-joale tsa titanium kapa cobalt-chromium alloy li lokolla likaroloana.. The Zirconia Toughened Alumina (ZTA) Matrix Composite ke biomaterial e se nang moeli bakeng sa lits'ebetso tse joalo.
ZTA: Bokamoso bo Solofetsang
Sena se kenyelletsa lipatlisiso tse tsoelang pele hammoho le nts'etsopele ea mekhoa ea ho ntlafatsa litšoaneleho tsa ZTA le ts'ebeliso ea eona e ka bang teng. Zirconia Toughened Alumina e 'ngoe e entsoeng ka sehlopha e entsoe ka thepa ea mochini ho latela matla a ho feto-fetoha a fokolang haholo ho feta a tsoang khoebong ea Biolox® Delta.. E 'ngoe, joalo ka silicon nitride ceramics composite e kentsoeng morao tjena ka har'a hip arthroplasty e boetse e bonts'a matla a phahameng ho feta alumina.Bokamoso bo khanyang bakeng sa ZTA e nang le lits'ebetso tse ngata le thepa e phahameng.. Ka hona, ka theknoloji e ntseng e tsoela pele, ho lebeletsoe hore ZTA e tla ba motheo oa likhopolo tse ncha ka mahlakoreng a fapaneng haholo-holo ka biomedicine.