Kulimba Kosagwirizana Ndi Zirconia Kulimbitsa Alumina (ZTA) Zoumba

Zirconia Toughened Alumina (ZTA) zoumba za ceramic zimadzitamandira kulimba kosayerekezeka. Amadzitamandira kukana kuvala kwapamwamba, kusakhazikika kwamankhwala komanso kugundana kochepa pakugwira ntchito mosavutikira pantchito zatsiku ndi tsiku – osatchula kuuma kwapamwamba ndi kuuma kuposa zitsulo.

ZTA imaphatikizapo ma metastable tetragonal zirconia polycrystal agglomerates mu alumina matrix omwe amasinthidwa ndi gawo lopangitsa kupsinjika kukhala mawonekedwe a monoclinic mopsinjika., motero kumabalalitsa kukameta ubweya wa ubweya ndikuletsa kufalikira kwa ming'alu, zodziwika bwino monga kusintha toughening.

Zosagwirizana ndi dzimbiri

ZTA imapereka kukana kwamphamvu kwamankhwala poyerekeza ndi aluminiyamu yoyera ndipo imatha kupirira kutentha kwambiri popanda kuwonongeka, kupanga kukhala chisankho choyenera chazinthu zamafakitale m'malo ovuta komanso mikhalidwe yovuta.

Kulimba kwa ZTA kumakulitsidwa ndi zirconia particles zomwe zimabalalitsa ndi kuyamwa mphamvu, kumathandiza kupewa kusweka. Pamene doped ndi yttrium okusayidi, zirconia amasintha kuchokera ku metastable tetragonal gawo kupita ku monoclinic panthawi ya nkhawa kuti apange kupsinjika komwe kumawonjezera kulimba kwa fracture..

Zirconia-based ceramics monga ZTA zili ndi alumina particles kuti asamatenthedwe ndi kutentha. Izi zimapangitsa kuti zizitha kupirira kusintha kwa kutentha kwachangu popanda kusweka kapena kulephera pamapulogalamu apamwamba kwambiri monga kugaya ndi kudula; kukulitsa kwake kocheperako komanso kozungulira kumapereka kuthekera konyamula katundu komanso kuthekera kochita bwino. ZTA imadzitamandira 2-3 nthawi zolimba zolimba zolimba poyerekeza ndi aluminiyamu yoyera pomwe muli ndi mizere yocheperako / torsional yokulirapo yamphamvu yonyamula katundu ndi kuthekera kochita.

Kuuma Kwambiri

ZTA imaphatikiza mphamvu ndi kulimba kwa alumina ndi zirconia kulimba kwa zinthu zapadera zomwe zimafunikira ntchito.. Kuphatikiza uku kumapereka mphamvu zosayerekezeka, kulimba kwa fracture, elasticity ndi kuuma katundu mu phukusi limodzi.

Claussen adapezeka 1976 kuti kuwonjezera kusakhazikika kwa zirconia ku alumina kumawonjezera kulimba kwake kwa fracture, chifukwa cha kusintha kwa tetragonal-monoclinic kwa mpweya wabwino wa tetragonal womwazika mkati mwa matrix ake.. Ma metastable precipitates oterowo amalepheretsedwa kuti asasinthe mpaka atatulutsidwa ndi mng'alu womwe ukuyandikira kutsogolo kapena njira ina yopumulira ku zovuta zawo., monga kusungunuka.

10mol 10mol% yttria-stabilized zirconia yotentha (10YSZ), kulimbitsa ndi ma particulate kapena mapulateleti okhala ndi kuchokera 0 mpaka 30wt% zokhala ndi aluminiyamu zidakhala ndi mphamvu zolimba, kulimba kwa fracture ndi kuyesa kwapang'onopang'ono kukula kwa 1000C mumlengalenga. Zotsatira zikuwonetsa kuti kulimba kwakukulu kwa kusinthasintha komanso kulimba kwa mapulateleti kumapezeka ndi zomwe zidapangidwa..

Kuthamanga Kwambiri Kwambiri

Zirconia ceramics amapereka mphamvu yophatikizika modabwitsa, kupirira, ndi kusinthasintha zomwe zimapambana kwambiri ndi zida zamaluso zamadotolo. Mapangidwe a Zirconia ngati ZTA amapereka njira zothetsera zovuta zamasiku ano kuyambira pazamlengalenga zomwe zimapirira madera ovuta kupita ku implants za m'badwo wotsatira zomwe zimapangidwira moyo wautali. – kupereka mayankho odalirika pazosowa zovutirapo masiku ano.

ZTA ndiyodziwika bwino pakati pa zida zina chifukwa champhamvu zake zosunthika, kulimba kwa fracture ndi kukana kufalikira kwa mng'alu chifukwa cha metastable gawo la tetragonal. Kusintha kumeneku kukhala zirconia ya monoclinic pa kutentha kochepa kumakakamiza chigawo patsogolo pa mng'alu kuti asiye kukula.

Yttria Yokhazikika Mwapang'ono Zirconia (Y-TZP) ndi Cerium Partially Stabilized Zirconia (Kodi-TZP) kuwonetsa kulimba kwapadera kofanana ndi ZTA chifukwa chosunga gawo la tetragonal posunga yttria kapena cerium pa kutentha kocheperako., kulola kusinthika pamlingo wowongoka bwino komanso kuwonetsa kuwonongeka pang'ono pamtunda pamayesero onyamula ma cyclic kuposa anzawo a Alumina.

Low Mkangano

Zirconia ndi imodzi mwazinthu zolimba kwambiri zaumisiri zomwe zilipo ndipo mawonekedwe ake otsika kwambiri amathandizira kukulitsa kukana komanso kumachepetsa zofunikira zamafuta..

ZTA ceramics ali ndi aluminiyamu kuti akhale olimba kwambiri. Izi zimalola kuti tinthu tating'onoting'ono ta yttria-stabilised tetragonal zirconia mu alumina masanjidwewo kukhala osasinthika., zotsalira zokhala ndi kristalo chifukwa cha kugwirizana kwa njere.

Zomwe zimayendetsedwa ndikuwongolera zimatsimikizira kuti kusinthika kwapang'onopang'ono kwa tetragonal-to-monoclinic sikuchitika pakuzizira kuchokera ku kutentha kwa sintering., zimathandizira pakuyesa kugunda kwamitundu yambiri pakuyesa kulimba kwa fracture. Komanso, kuphatikizika kwakukulu kwamitundu ya alumina-zirconia yokhala ndi timbewu tating'onoting'ono kumapangitsa kuti mphamvu ya mng'ala ikhale yocheperako, yomwe imatanthawuza kuti ming'alu ifupikitse pakuyesa kuyika kwa diamondi..

Kukula Kwapamwamba Kwambiri

Mphamvu yomangirira ya Alumina matrix imalepheretsa tinthu tating'onoting'ono ta zirconia kuti zisasinthe kukhala zirconia ya monoclinic ikazizira., motero kupanga 10 mole % yttria-stabilized zirconia-alumina composites okhazikika komanso osasweka.

Kuphatikiza kwa cerium ku zirconia kumapangitsa kuti ikhale yokhazikika (Kodi-TZP). Ce-TZP imasunga gawo lake la tetragonal kutentha kwapakati komanso kumawonjezera kulimba, kulimba kwa fracture ndi mphamvu yosinthika poyerekeza ndi zida zamano zadongo.

Zirconia Toughened Alumina composites kuphatikiza Ce-TZP, yttria-stabilized zirconia (Y-TZP), kapena magnesia-stabilized zirconia (Mg-PSZ) amawonetsa kulimba kwapadera komwe kumaposa zonse za alumina ndi monolithic zirconia, kupanga ZTA kukhala woyenera kufunsira ntchito ngati ma implants azachipatala, zigawo zazamlengalenga ndi makina opangira mafakitale. ZTA ilinso ndi zinthu zambiri zotsutsana ndi mankhwala zomwe zimayiteteza ku ma acid, mchere zothetsera, mchere wosungunuka alkalis komanso kutentha kwambiri.