I-Zirconium oxide ne-aluminium oxide kuhlanganiswe ndawonye kukhiqiza i-Zirconia Toughened Alumina (I-ZTA), impahla ehlukile ezinhlelweni eziningi. Izakhiwo zemishini, amandla, ukuqina kwe-fracture, ukunwebeka, ubulukhuni nokumelana nokugqoka kuyaziswa kakhulu kule nhlanganisela yezinto zobumba eziyingxenye ye-AZ composite.. I-ZTA isibe yisinqumo esikhethwayo samandla aphezulu wemishini, ukumelana nokushisa nokumelana nokugqwala.
Ukuqopha Ukubunjwa Nesakhiwo
Phakathi kwezinye izinto, I-Zirconia Toughened Alumina iqukethe izinhlamvu ze-zirconia ezihlakazeke ngokufanayo ngaphakathi kwe-alumina matrix.. Ngokujwayelekile, lokhu kuhlanganisa 10-20% umthamo we-ZrO2 ku-alumina. Kuye ngezilinganiso zabo, izingxube ezakhiwe zifaka isandla kuzitsha zobumba ezinezici ezithile kuye ngohlelo oluthile.
Amabhulokhi Okwakha: I-Alumina ne-Zirconia
Izingxenye eziyinhloko ezixubene ukwenza i-ZTA yi-alumina ne-zirconia. Ngaphezu kwalokho, izimila zamathambo bezilokhu zisebenzisa le nto yobumba eyaziwa ngokuthi i-Aluminium Oxide (I-Al2O3) emlandweni ngenxa ye-biocompatibility yayo enhle kanye namandla ayo amakhulu emishini nokumelana nokuphuka.
Enye impahla evelele ye-zirconia izinga layo eliphansi lokugqwala kanye nokuzinza okuhle kwamakhemikhali namandla aphezulu emishini.. I-modulus yayo Encane ilandelana ngosayizi nama-alloys ensimbi engagqwali.
Yenziwa Kanjani
Ukukhiqiza i-ZTA kusho ukudala izinhlamvu ze-tetragonal-phase zirconia ezisatshalaliswa ngokufanayo kuyo yonke i-alumina matrix.. Ukugxila kwe-crack tip stress kungashintsha isakhiwo sekristalu se-tetragonal sibe yi-monoclinic ngaleyo ndlela kuholele ekwenyukeni okuhlobene kwevolumu ye-zirconia.. Ukunwetshwa kwevolumu okunjalo kubuyisela emuva ngempumelelo noma kumisa ukukhula koqhekeko okuholela kukuqina namandla amakhulu.
Izakhiwo Zemishini Ze-ZrO2-Al2O3 Ceramics
Kunezinhlobonhlobo zezakhiwo zemishini ezivezwe yi-ZTA kufaka phakathi ubulukhuni obuphakeme kunama-alumina avamile anamanani afanayo okuminyana., amandla aphezulu okuguquguquka kunama-alumina avamile futhi aphansi kune-coefficient ye-zirconias evamile yokwandiswa okushisayo okuqondile (I-CLTE).
I-Zirconia Toughened Alumina inamandla amakhulu okusebenza futhi imelana ngokushisa okushisayo yingakho ingagqwali.. Ngezansi ezinye zezakhiwo ze-ZTA:
Impahla Inani
I-Chemical Formula Zr-Al2O3
Ukuminyana 4.1-4.38 g/cm^3
Ukuqina 1750-2100 Inkinobho
I-Elasticity 45-49 x 10^6 psi
Amandla e-Flexure 100-145 ksi
Isilinganiso sikaPoisson 0.26
Ukuphuka Kokuqina 5-7 I-MPa m^1/2
I-Coefficient of Thermal Expansion 8.0-8.1 x 10^-6 1/C
I-Thermal Conductivity 20.0-21.0 W/mK
Ukumelana Nokwethuka 325 °C
Izinga Lokushisa Eliphezulu Lokusebenza 1650 °C
Izicelo ze-ZrO2-Al2O3 Ceramics
I-Zirconia Toughened Alumina isetshenziswa ezinhlelweni ezahlukahlukene njengalezo ezidinga amandla aphezulu nokumelana nokugqoka. Lezi zihlanganisa ama-valve seal, imikhono, futha pistons, ukufutha imibhobho nezinye izingxenye zezimboni.
I-Biocompatibility ye-ZTA
Ezifundweni ezehlukene, I-ZTA kubikwe ukuthi ayikhiqizi ukusabela kwezicubu ezimbi lapho ifakwa ngaleyo ndlela iyenze ibe ngumuntu olungele izingxenye ezithwala umthwalo wamathambo.. Ngaphezu kwalokho, ubulukhuni, ukuqina namandla okuvezwa izitsha zobumba ze-zirconia-alumina kubenza bafaneleke izingxenye ezithwala umthwalo wamathambo.
I-ZTA ku-Hip Arthroplasty
Kube nezingxoxo eziningi mayelana nezitsha zobumba ezifana ne-alumina, i-zirconia ne-zirconia i-alumina eqinile (I-ZTA) njengezinto ezifanele ku-hip arthroplasty . Lezi zinzuzo ze-ZTA zafezwa ngaphandle kokufakwa kokubi okuhlotshaniswa ne-yttria-stabilized zirconia ebonisa izakhiwo eziphakeme zemishini noma i-alumina ngokungabi namandla kwayo okuphezulu..
I-ZTA ku-Knee Arthroplasty
Ikakhulukazi, imiklamo yokufakelwa kwe-ceramic ye-arthroplasty ephelele yamadolo (I-TKA) zakhiwe ukuze kusingathwe udaba lokungezwani komzimba okungenzeka ezigulini lapho izakhi zesimanje ze-titanium noma i-cobalt-chromium alloy zikhulula izinhlayiya zokugqoka.. I-Zirconia Yaqinisa I-Alumina (I-ZTA) I-Matrix Composite iyi-biomaterial enqenqemeni yezinhlelo ezinjalo.
I-ZTA: Ikusasa Elithembisayo
Lokhu kuhlanganisa ucwaningo oluqhubekayo kanye nokuthuthukiswa kwezindlela zokuthuthukisa izici ze-ZTA kanye nokusetshenziswa kwayo okungaba khona. Enye i-Zirconia Toughened Alumina ecutshungulwe ngeqoqwana iklanywe yaba nezakhiwo zemishini ngokwamandla aguquguqukayo angaphansi kakhulu kunalawo atholakala kwezentengiso i-Biolox® Delta.. Okunye, njenge-silicon nitride ceramics composite eyethulwe kamuva nje ku-hip arthroplasty iphinde ibonise amandla aphezulu kune-alumina.Ikusasa liqhakazile ku-ZTA ngezinhlelo zokusebenza eziningi kanye nezakhiwo eziphezulu.. Ngakho-ke, ngobuchwepheshe obuthuthukayo, kulindeleke ukuthi i-ZTA ibe yisisekelo semibono emisha emikhakheni ehlukahlukene ikakhulukazi ku-biomedicine.