Zirconia Toughened Alumina

I-Zirconia yaqinisa i-alumina (ZTA) yimathiriyeli yeceramic ephucukileyo esetyenziswa kakhulu kwizitywina zevalvu, amahlahla, amacandelo epompo kunye nezixhobo zokusika ngenxa yamandla ayo kunye nokuzinza kweekhemikhali – njengoko kubonakaliswa ngamandla ayo okumelana nemithwalo enzima ngaphandle kokuthotywa okubalulekileyo.

I-ZTA inokumelana nokothuka kwe-thermal kwaye inokumelana nokutshintsha ngequbuliso kutshintsho lobushushu, kwakunye nokutshintsha kobushushu obukhawulezayo. Funda ngakumbi malunga neempawu zayo zoomatshini!

Ukuqina

I-Zirconia yongezwa kwi-matrix ye-alumina yandisa ubunzima bayo, ukuqina kokwaphuka kunye namandla okuguquguquka ngelixa unyusa ukuxhathisa ukunxiba kunye nokhukuliseko. Indlela eqhelekileyo ebandakanyekayo lutshintsho lwesigaba olulandelwa yi-microcrack kodwa inokubandakanya ithiyori yoxinzelelo njengoko isebenza..

I-zirconia ye-tetragonal ene-metastable ye-tetragonal precipitates eyenza ukusasazwa kakuhle ngaphakathi kwe-alumina matrix inokutshintsha ngokukhawuleza kwiifom ze-monoclinic xa ukunyanzeliswa kwabo kuphakanyiswa ngexesha lokusasazwa kokuqhekeka., ukubonelela amandla ngokuchasene nemimandla yoxinzelelo eqhuba ukusasazwa kokuqhekeka.

I-ceramic ye-ZTA inokuqina kobunzima obuphezulu kunye nokuqina xa kuthelekiswa nezinye iiseramikhi zobunjineli ezisekwe kwi-oxide, kunye nokuphinda kabini amandla okudinwa komjikelo we-Y-TZP. Njenge, iimpawu zayo zenza ukuba zilungele izicelo ezifuna ukuxhathisa okugqithisileyo, Inertness yeekhemikhali kunye nokukhuhlana okuphantsi kunye namandla aphezulu kunye nokuqina.

Amandla e-Flexural

Iiseramics ze-ZTA zingenziwa ngokuguqula umlinganiselo we-yttria ezinzile zirconia (Y-TZP) ngaphakathi kwe-alumina matrix usebenzisa ucinezelo olushushu lwe-isostatic, ukwandisa ukuqina-ukwaphuka ukuqina-ukuqina kwamandla okudityaniswa okukhokelela ekunganyangekiyo kokumelana nokudinwa kwebhayisikile ukodlula ezona zixhobo ziphambili zobugcisa..

I-Metastable Y-TZP kwi-alumina matrix iphumela ekwenziweni kwe-agglomerates yesigaba senguqu ye-tetragonal-monoclinic eyandisa ukuqina kokwaphuka ngokuguqulwa kwesigaba sokuqina. (Clausen 1976). Ngokukhethekileyo ukunqumla iintanda, ezi agglomerates zenguqu ziyakucinezela indawo ephambi kwe-crack front kwaye inciphise ukuqhubeka kwayo, ekugqibeleni kwandisa ukuqina kokwaphuka.

Esi sakhiwo sezinto eziphathekayo siye sakhokelela ekudalweni kwe-alumina-zirconia composites ezifana neBIOLOX Delta, isetyenziswe ngokubanzi ukutshintshwa kwe-hip epheleleyo kunye nezinye iinxalenye ze-orthopedic ezithwele umthwalo. Le ye-ceramic biomaterial ibonakalisa ukuxhathisa okubalaseleyo, inertness imichiza kwiqondo lokushisa, ukuxhathisa ukothuka kwe-thermal kunye nokungasebenzi kakuhle kweekhemikhali kuwo onke amaqondo obushushu.

Ukunyangwa kokuMhlwa

Inert ngokwekhemikhali kwaye iyamelana namaqondo obushushu aphezulu kunye nokunxiba, inikeza ukusebenza okuphezulu xa kuthelekiswa 99 i-alumina ceramics kwaye inexabiso elithe kratya ngokunjalo.

I-Zirconia ikwaqhayisa ngamandla okuqina, iipropati eziguquguqukayo kunye ne-elasticity kunye ne-biocompatibility – ukuyenza ilungele ukusetyenziswa kwezonyango njengokutshintshwa kwenyonga. Ngenxa yokuguqulwa kokuqina phantsi kweemeko zoxinzelelo, amasuntswana e-zirconia atshintsha ukusuka kwifomu ye-tetragonal ene-metastable ibe yifom ye-monoclinic, ukunceda ukuvala iintanda ngokufanelekileyo ngelixa unyusa ukuqina kokwaphuka.

CeramTec (I-Biolox Delta) ithengisa i-alumina-zirconia edibeneyo apho i-zirconia engazinzanga ihlala ikwinqanaba le-tetragonal ukulawula olu tshintsho kunye nokubonelela ngengcebiso yokuqhekeka kunye nokutenxa kokuqhekeka., ukuphucula ukuqina kwe-alumina matrix. Umxholo we-Zirconia wezinto eziphathekayo unokuguqulwa ngokulungiselela umgubo kunye neendlela zokuxinana.

Ukunyangwa kweThermal Shock

I-Zirconia eyongezwe kwi-matrix ye-alumina ephambili ngexesha le-sintering inokwandisa kakhulu amandla kunye nokuqina kwayo, ukudala into eyaziwa ngokuba yi-ZTA (Zirconia Toughened Alumina), ezigqwesileyo iiseramikhi ze-alumina eziqhelekileyo kuzo zombini oomatshini kunye nezicelo zokunxiba.

I-alumina eqinile yeZirconia iphawuleka ngeempawu zayo ezikhethekileyo ezinjengokuqina okutshisa okuphakamileyo kunye namandla okuxhwila., inertness imichiza kwiqondo lokushisa, amazinga aphantsi okwandiswa kwe-thermal kunye nokumelana nokutshatyalaliswa kwe-thermal – iipropathi ezifanelekileyo zamacandelo okusila kunye neenxalenye zokunxiba ezifuna iindlela zokupholisa.

I-CeramTec ithengisa i-ZTA ebizwa ngokuba yi-Biolox delta ene-alumina matrix enamasuntswana e-Y-TZP asasaziweyo. (17 ubunzima/wt%) kunye nestrontium aluminate platelets (0.5 ubunzima/wt%), ukubonelela ngendibaniselwano esebenzayo yeendlela zenguqu yesigaba se-tetragonal-to-monoclinic kunye neendlela zokuphambuka kwe-crack ukubonelela ngokuqina okuphuculweyo., eyenza oku kulunge kwiinkqubo eziphambili ze-THA kwimigangatho yokuthwala ibhinqa.

Ukugqunywa koMbane

I-alumina ye-Zirconia-toughened inokumelana nokutshitshiswa kwe-thermal ngaphandle kokuqhekeka okanye ukuphuka phantsi kotshintsho olukhawulezayo kwiqondo lokushisa., enkosi kumasuntswana e-alumina asasazekileyo asasazeke ngaphakathi kwe-matrix efunxa amandla obushushu kwaye enze uxinzelelo olucinezelayo oluthintela ukwaphuka..

I-alumina-zirconia ceramic ixinene ngakumbi kunomlingani wayo ococekileyo we-zirconia, iyenza ibe yinto efanelekileyo kwizicelo zokugquma umbane. Ngaphaya koko, ukwanda kwayo okuphantsi kwe-thermal kune-zirconia kwenza ukuba ilungele iindawo ezifuna ukupholisa.

Ukuguqulwa kwe-toughening ye-Alumina-zirconia composites inikezela ngeenzuzo ezongezelelweyo; Apha, Iinkozo ze-zirconia kwimatrix ye-alumina zingena kwisigaba esine-metastable apho iinkozo zazo zitshintsha ukusuka kwi-tetragonal ukuya kwizakhiwo ze-monoclinic., ngaloo ndlela kunciphisa ukuqhekeka okubangelwa uxinzelelo ngokunyusa ukuchasana ngokuchasene ne-abrasion kunye neempembelelo. I-alumina eqinile i-zirconia iyenzeka ngokuphendula kwepyrophoric ebandakanya iZirconium(IV) ioksidi octahydrate, I-Aluminiyam Nitrate Nanohydrate Triethylamine kunye ne-HNO3(I-nitric Acid); ukwandisa ubungakanani bamasuntswana uncedo ngakumbi ukusasazwa kweenkozo ze-zirconia ezinemetastable.