Zirconia Toughened Alumina for Advanced Application

I-ZTA yinto edibeneyo ye-alumina-zirconia, yahlulwe ngamandla aphezulu kunye nokuqina. Iveliswe ngotshintsho olubangelwa luxinzelelo lwezirconia ezintle zetetragonal kwimatrix yealumina..

I-Zirconia ceramics zizinto eziphawulekayo zobugcisa, Ukuqhayisa ngobulukhuni obubalaseleyo, ukuzinza kwe-thermal, ukunxiba ukuxhathisa kunye neendawo zokusebenza apho ezinye iiseramics ezininzi azikwazi ukwenza. Iintsimbi neeplastiki azinakuthelekiswa nanto. Ngaphaya koko, i-zirconia ceramics ikwabonisa ubulukhuni obubalaseleyo bokwenza izixhobo.

Amandla

I-ZTA ibalasele phakathi kwemathiriyeli yeceramic ngamandla ayo akhethekileyo kunye nokuqina, nxiba ukumelana, ukungazinzi kweekhemikhali, i-coefficient ephantsi yokhuhlane, ubunzima obuphezulu / ukuqina komlinganiselo kunye nokwandiswa kwe-thermal coefficient ephantsi xa kuthelekiswa nabanye abaninzi – ukuyenza ibe yinto efanelekileyo kwizicelo ezifana nezixhobo zokusika. Ngaphaya koko, biocompatibility yayo kwakhona kwenza ZTA ukhetho enomtsalane impahla.

I-ZTA ichazwa ngokusasazwa kwayo ngokufanayo kwee-tetragonal zirconia particles ngaphakathi kwe-alumina matrix. Oku kufezekiswa kusetyenziswa ubuchule obuntsonkothileyo bokuxuba obufana nokungqusha ibhola kunye ne-high-energy attrition milling.; xa sele zidityanisiwe kunye umgubo unokubunjwa ube licandelo elicetyiweyo usebenzisa ucinezelo olomileyo, ukucinezela isostatic, isitofu sokubumba okanye ubuchule bokukhupha.

I-Zirconia isasazwe kuyo yonke i-alumina matrix iphucula ukuqina kokwaphuka ngokufunxa kunye nokuchitha amandla okuqhekeka., eyaziwa ngokuba yinguqu yokuqina. I-Zirconia ikwanegalelo ekunxibeni kokumelana ngokuvelisa uxinzelelo olucinezelayo oluthintela ukwanda kokuqhekeka – kwaziwa njengokuzilola – ukwenza i-ZTA ibe yinto ebalaseleyo yokukhetha amavili okugaya.

Ukuqina

Zirconia Toughened Alumina (ZTA) iiseramics ziqhayisa amandla amangalisayo kunye nokuqina kokwaphuka, izenza zigqibelele ukusetyenziswa kuluhlu lwezicelo kunye nokusingqongileyo. Oku komelela okumangalisayo kuvela kwinguqu yesigaba esibangelwa luxinzelelo lwesohlwayo, iisuntswana ze-tetragonal zirconia ezisasazwe ngokufanayo ngaphakathi kwe-alumina matrix; Uxinzelelo lubangela uguquko lwesigaba ukuvelisa uthungelwano lwe-microcrack ye-zirconia-alumina efunxa amandla okusasaza kokuqhekeka ngokufanelekileyo ukulibazisa ukusasazeka kwabo ngelixa inyusa ukumelana nokwaphuka. (Clausen 1976).

I-ZTA ibalasele ngenxa yokumelana nokothuka kwe-thermal. Ndiyabulela kwindibaniselwano yayo ekhethekileyo yokwakheka kwesigaba se-tetragonal-monoclinic, le ceramic inokumelana nokutshintsha ngokukhawuleza kweqondo lokushisa ngaphandle kokuqhekeka okanye ukuphuka, Ngelixa uguqulo olubangelwa luxinzelelo lwezirconia lube kwimo ye-tetragonal enemetastable ivelisa uxinzelelo oluchasene nokwakheka kweentanda ngaphakathi kwe-alumina matrix kwaye yonyusa kakhulu ukuqina ngaloo ndlela inyusa ukusebenza kwe-ZTA..

I-ZTA ayinawo amandla ayo kuphela, isakhiwo se-tetragonal-monoclinic kunye nobunzima obuphezulu bokuphuka, kodwa kunye ne-coefficient ephantsi yokwandiswa kwe-thermal (CTE), ukuyenza ilungele usetyenziso olufuna amaqondo obushushu agqithisileyo okanye imo engqongileyo apho uzinzo lwe-dimensional lubalulekile, njengezinto ezichanekileyo okanye iipakethe zombane.

I-ZTA ibalasele phakathi kwemathiriyeli yokufakelwa kwezonyango ngenxa yendibaniselwano yokumelana nemichiza, iipropathi zoomatshini kunye noxinzelelo luncedise ukuxhathisa umhlwa emanzini okanye kulwelo lomzimba, ukuyenza ibe ngumgqatswa ophambili wokufakelwa kwezonyango njengeentloko ze-femoral zamathambo kunye ne-acetabular liners. I-BioloX Delta biomaterial ngomnye umzekelo onjalo; isetyenziswe kakhulu ngexesha lotyando lwamathambo kuzo zombini izicelo.

Ukunyangwa kokuMhlwa

I-ZTA ineempawu eziphezulu ze-alumina kunye ne-zirconia, ukuyenza imelane kakhulu nokuhlaselwa kweekhemikhali kunye nokunxiba, iyenza igqibelele kusetyenziso olubandakanya imeko-bume ethanda ukutyiwa okanye ukukhuhlana okuphinda-phindayo okanye uxinzelelo koomatshini..

Ukudibanisa ukuqina kwe-alumina kunye nokuqina kwe-zirconia kubangela iipropathi ezibalaseleyo ze-tribological ezenza ukuxhathisa okugqwesileyo kumacandelo anemithwalo enzima kunye nokusetyenziswa kwexesha elide., ezifana nokufakelwa kwamathambo, izixhobo zokusika kunye nokunxiba izinto ezixhathisayo ezisetyenziswa kulawulo lwamanzi (izikhokelo zomsonto, iibheringi, imilomo njl). Le ndibaniselwano isetyenziswa ngokukodwa kwizicwangciso zonyango kunye nezoshishino ezifana nokufakelwa kwamathambo, izixhobo zokusika okanye ulawulo lwamanzi (izikhokelo zomsonto iibheringi imilomo njl).

Ukuqina kokwaphuka okuphuculweyo kwe-ZTA kunokubalelwa kumasuntswana e-zirconia asasazwe kakuhle kwimatrix ye-alumina.. Xa iintanda ziqala ukwanda, xa amandla abo esanda kwaye asasazeke ngakumbi, Ezi zinkozo ze-tetragonal zirconia zingena kwinguqu yesigaba ukuze zifunxe kwaye zisichithe njengenxalenye yendlela yokuguqula ukuqina. – kungoko kuphuculwa ukomelela kokwaphuka kwesi sixhobo.

Impumelelo ekwenzeni i-ZTA ceramic ikukusebenzisa umgangatho we-zirconia kunye ne-alumina powders engenabumdaka.. I-Sintering kufuneka ilawulwe ukunqanda utshintsho oluzenzekelayo lwe-tetragonal-to-monoclinic zirconia ngexesha lokupholisa kunye nokunciphisa ukubunjwa kwesigaba se-monoclinic esine-metastable esichaphazeleka kwi-chemisorption kunye neemolekyuli zamanzi ezikhokelela ekuthotyweni kobushushu obuphantsi ngokusetyenziswa kwexesha elide.; Inkqubo ye-saint-Gobain ZirPro ye-ZTA ye-ceramic ye-ceramic yenziwa ngokukodwa ukunqanda izinto ezingathandekiyo.. Ngethamsanqa iSaint-Gobain ZirPro yeceramic ye-ZTA ceramic yenzelwe ngokukodwa ukuthintela izinto ezinjalo ukuba zenzeke. –

Ukuzinza kweThermal

Zirconia Toughened Alumina (ZTA) inokumelana nokutshintsha kobushushu obukhawulezayo ngaphandle kokuqhekeka okanye ukuqhekeka, enkosi kumasuntswana e-zirconia asasazwe ngaphakathi kwe-alumina matrix efunxa amandla obushushu kunye nokudala uxinzelelo oluthintela ukuqhekeka kunye nokusilela.. Kuba i-ZTA ifunxa amandla ashushu ngokufanelekileyo, esi sixhobo senza ukhetho olubalaseleyo lwezicelo ezifuna ukumelana nobushushu obuphezulu.

Ukongezwa kwe-zirconia kwi-matrix ye-alumina kunokonyusa ukuqina kokuphuka ngelixa ngaxeshanye kuphuculwe iipropathi zoomatshini njengamandla kunye nokumelana nokunxiba.. Ukuqina okwandileyo kokuqhekeka kwe-ZTA kungenxa yotshintsho olubangelwa luxinzelelo ukusuka kwisigaba se-metastable tetragonal ukuya kwisigaba se-monoclinic kumaqondo obushushu aphakathi.; isiphumo sandiswe ziisayizi ezincinci zeenkozo ze-zirconia kunezo ze-alumina.

Izinzisi zihlala ziqeshwe ukugcina isigaba se-tetragonal zirconia kwizinto ze-ZTA ezifana ne-Biolox Delta.; nangona kunjalo, iziphumo ezifanayo zinokufezekiswa ngaphandle kokuzinzisa ngokwemiqathango yokusabalalisa i-particle kunye nokuqina kwe-fracture.

Indibaniselwano ye-alumina kunye ne-zirconia yenza i-ceramic ephezulu egqwesileyo ngamandla, ukwaphuka kokuqina, ukuqina kunye nobunzima – iimpawu ezibalulekileyo kwizicelo ezifuna ukusebenza kolwakhiwo kunye nokuxhathisa umhlwa. Iiseramikhi ze-ZTA zithande ukodlula 99% iiseramikhi ze-alumina ekubeni zingabizi kakhulu ngelixa zihlangabezana neemfuno zesicelo esithile ngokufanelekileyo; umlinganiselo wabo unokude ulungelelaniswe ngokukodwa.