I-Zirconium oxide kunye ne-aluminiyam oxide zidityaniswe isivuno iZirconia Toughened Alumina (ZTA), imathiriyeli ekhethekileyo kwizicelo ezininzi. Iimpawu zoomatshini, amandla, ukwaphuka kokuqina, ukuqina, Ukuqina kunye nokumelana nokunxiba kuyaxatyiswa kakhulu kule mveliso ye-ceramic edibeneyo yodidi lwe-AZ composites.. I-ZTA ibe lolona khetho lukhethiweyo lwamandla omatshini aphezulu, ukumelana nobushushu kunye nokumelana nokugqwala.
Ukucazulula ukuBunjwa kunye neSakhiwo
Phakathi kwezinye izinto, I-Zirconia Toughened Alumina iqulathe iinkozo ze-zirconia ezisasazwe ngokufanayo ngaphakathi kwe-alumina matrix.. Ngokuqhelekileyo, oku kubandakanya 10-20% umthamo we-ZrO2 kwi-alumina. Kuxhomekeke kubungakanani bazo, imixube ekhoyo inegalelo kwiiseramics ezineempawu ezithile ngokuxhomekeke kwisicelo esithile.
Iibhloko zokwakha: I-Alumina kunye neZirconia
Amacandelo aphambili axutywe ukwenza i-ZTA yi-alumina kunye ne-zirconia. Ngaphezu koko, Ukufakelwa kwe-orthopedic kuye kwasebenzisa le mathiriyeli ye-ceramic eyaziwa ngokuba yi-Aluminiyam Oxide (Al2O3) kwimbali ngenxa biocompatibility yayo elungileyo kwakunye namandla ayo oomatshini kunye nokumelana ukwaphuka.
Enye ipropathi ebalaseleyo ye-zirconia yimilinganiselo yayo ephantsi yokubola kunye nokuzinza okuhle kweekhemikhali kunye namandla aphezulu omatshini.. I-modulus yayo encinci ikwindlela efanayo yobukhulu kunye ne-alloys yensimbi engenasici.
Yenziwa Njani
Ukuvelisa i-ZTA kuthetha ukudala iinkozo ze-tetragonal-phase zirconia ezisasazwa ngokufanayo kwi-alumina matrix.. Uxinzelelo lwe-crack tip yoxinzelelo lunokuguqula ukwakheka kwekristale ye-tetragonal ibe yi-monoclinic ngaloo ndlela ikhokelela ekwandeni okuhambelana nomthamo we-zirconia.. Ukwandiswa komthamo onjalo kubuyisela umva okanye kunqande ukukhula koqhekeko olukhokelela kukuqina nokomelela okukhulu.
IiPropati zoomatshini zeZrO2-Al2O3 zeCeramics
Kukho uluhlu olubanzi lweepropathi zoomatshini eziboniswe yi-ZTA kubandakanya ubulukhuni obuphezulu kuneealumina eziqhelekileyo ezinamaxabiso afanayo oxinaniso., Amandla aphezulu okuguquguquka kuneealuminas eziqhelekileyo kwaye asezantsi kune-zirconias i-coefficient yesiqhelo yokwandiswa kwe-thermal. (I-CLTE).
I-Zirconia Toughened Alumina inamandla amakhulu omatshini kwaye ayinyangeki ngokutshisa ngenxa yoko ayidleki.. Ngezantsi kukho ezinye zeepropathi ze-ZTA:
Ixabiso lePropati
I-Chemical Formula Zr-Al2O3
Ukuxinana 4.1-4.38 g/cm^3
Ukuqina 1750-2100 Iqhosha
Ukolula 45-49 x 10^6 psi
Amandla eFlexure 100-145 ksi
Umlinganiselo wePoisson 0.26
Ukuqina kokwaphuka 5-7 IMPa m^1/2
I-Coefficient yoKwandiswa kweThermal 8.0-8.1 x 10^-6 1/C
I-Thermal Conductivity 20.0-21.0 W/mK
Ukuxhathisa okothusayo 325 °C
Ubushushu bokusebenza obuninzi 1650 °C
Ukusetyenziswa kwe-ZrO2-Al2O3 Ceramics
I-Zirconia Toughened Alumina isetyenziswa kwizicelo ezahlukeneyo ezifana nezo zifuna amandla aphezulu kunye nokumelana nokunxiba. Ezi ziquka izitywina zevalvu, imikhono, iipiston zokumpompa, imilomo yokutshiza kunye nezinye iindawo zoshishino.
I-Biocompatibility ye-ZTA
Kwizifundo ezahlukeneyo, I-ZTA iye yaxelwa ukuba ivelise ukuchasana kwezicubu ezingalunganga xa ifakelwa ngoko ke iyenza ibe ngumgqatswa olungileyo wezinto ezithwala umthwalo wamathambo.. Ukwengeza, ubunzima, Ukuqina kunye namandla abonakaliswe yi-zirconia-alumina ceramics ibenza bafaneleke kumalungu athwele umthwalo wamathambo..
I-ZTA kwi-Hip Arthroplasty
Kubekho iingxoxo ezininzi malunga neeseramikhi ezifana ne-alumina, i-zirconia kunye ne-zirconia ye-alumina eqinile (ZTA) njengezinto ezifanelekileyo kwi-hip arthroplasty . Ezi zibonelelo ze-ZTA zaphunyezwa ngaphandle kokubandakanya izinto ezingeloncedo ezinxulunyaniswa ne-yttria-zirconia ezinzisiweyo ebonisa iipropathi eziphezulu zoomatshini okanye i-alumina ene-inertness ephezulu..
I-ZTA kwi-Knee Arthroplasty
Ubukhulu becala, uyilo lokufakelwa kwe-ceramic kwi-arthroplasty epheleleyo yamadolo (TKA) ziye zaphuhliswa ukuze zijongane nomba wokungaguquki komzimba onokuthi kwenzeke kwizigulana xa i-titanium yanamhlanje okanye i-cobalt-chromium alloy components ikhupha amasuntswana okunxiba.. I-Zirconia yaqinisa iAlumina (ZTA) I-Matrix Composite yi-cutting edge biomaterial kwizicelo ezinjalo.
ZTA: Ikamva Elithembisayo
Oku kubandakanya uphando oluqhubekayo kunye nophuhliso kwiindlela zokuphucula iimpawu ze-ZTA kunye nokusetyenziswa kwayo okunokwenzeka. Enye i-batch-processed Zirconia Toughened Alumina iyilwe ineempawu zoomatshini ngokwamandla aguquguqukayo angaphantsi kakhulu kunalawo afumaneka kurhwebo lweBiolox® Delta.. Enye, ezifana nesilicon nitride ceramics composite eziveliswe mva nje kwihip arthroplasty ikwabonisa amandla aphezulu kunealumina.Ikamva liqaqambile kwiZTA enezicelo ezininzi kunye neepropati eziphezulu.. Ngoko ke, ngeteknoloji ephuhlayo, Kulindeleke ukuba i-ZTA ibe sisiseko seekhonsepthi ezintsha kwiinkalo ezahlukeneyo ngakumbi kwi-biomedicine.