Zirconia Toughened Alumina

I-Zirconia iqinisa i-alumina (I-ZTA) iyimpahla ye-ceramic ethuthukisiwe esetshenziswa kabanzi kuma-valve seal, amahlahla, izingxenye zepompo namathuluzi okusika ngenxa yamandla ayo nokuzinza kwamakhemikhali – njengoba kufakazelwa ikhono layo lokumelana nemithwalo esindayo ngaphandle kokuwohloka okukhulu.

I-ZTA inokumelana nokushaqeka okumangazayo okushisayo futhi ingamelana nokushintsha okungazelelwe kokushintsha kwezinga lokushisa, kanye nokushintshashintsha kwezinga lokushisa ngokushesha. Qhubeka ufunde ukuze ufunde kabanzi mayelana nezakhiwo zayo zemishini!

Ukuqina

I-Zirconia engezwe ku-alumina matrix yandisa ubulukhuni bayo, ukuphuka kokuqina namandla okuguquguquka ngenkathi kukhula ukumelana nokuguga nokuguguleka. Indlela evame ukuhileleka ukuguqulwa kwesigaba okulandelwa ukwakheka kwe-microcrack kodwa kungase futhi kubandakanye amathiyori wethiyori yokucindezeleka njengoba kusebenza..

I-zirconia ye-metastable tetragonal precipitates eyenza ukuhlakazeka okuhle ngaphakathi kwe-alumina matrix ingashintsha ngokuzenzakalelayo ibe amafomu we-monoclinic lapho umkhawulo wabo uphakanyiswa ngesikhathi sokusakazeka koqhekeko., ukuhlinzeka amandla ngokumelene nezinkambu zokucindezeleka ukushayela ukusabalalisa ukuqhuma.

I-ZTA ceramic inokuqina okuqinile kokuphuka nokuba lukhuni uma kuqhathaniswa nezinye izitsha zobumba zobunjiniyela ezisekelwe ku-oxide, kanye namandla okukhathala okuphindwe kabili kwe-Y-TZP. Kanjalo, izakhiwo zayo ziyenza ifanelekele izinhlelo zokusebenza ezidinga ukumelana nokugqoka ngokweqile, ukungabi namakhemikhali kwamakhemikhali kanye nokungqubuzana okuphansi kanye namandla aphezulu nokuqina.

Amandla e-Flexural

Izitsha zobumba ze-ZTA zingenziwa ngokushintsha isilinganiso se-yttria ezinzile zirconia (Y-TZP) ngaphakathi kwe-alumina matrix usebenzisa ukucindezela okushisayo kwe-isostatic, ukukhulisa ukuqina-ukuphuka kokuqina-inhlanganisela yamandla eguquguqukayo ephumela ekungalinganisweni kokukhathala okujikelezayo okudlula izinto zobumba ezithuthuke kakhulu zobuchwepheshe.

I-Y-TZP ye-Metastable ku-alumina matrix iphumela ekwakhekeni kwe-tetragonal-monoclinic transformation phase agglomerates okwandisa ukuqina kokuphuka ngokuqina kokuguqulwa kwesigaba. (Clausen 1976). Ngokukhetha ukuwela imifantu, lawa ma-agglomerates oguquko azocindezela indawo engaphambi kwe-crack front futhi anciphise ukuqhubeka kwawo, ekugcineni kwandisa ukuqina kokuphuka.

Lesi sakhiwo sezinto ezibonakalayo siholele ekwakhiweni kwezinhlanganisela ze-alumina-zirconia ezifana ne-BIOLOX Delta., esetshenziswa kakhulu ekubuyiselweni kwe-hip okuphelele nezinye izingxenye zamathambo ezithwala umthwalo. Le biomaterial ye-ceramic ifaka ukumelana okuvelele kokugqokwa, inertness chemical ekamelweni lokushisa, ukumelana nokushaqeka okushisayo kanye nokungangeni kahle kwamakhemikhali kuwo wonke amazinga okushisa.

Ukumelana Nokugqwala

Awenzi ngamakhemikhali futhi amelana namazinga okushisa aphezulu nokuguga, inikeza ukusebenza okuphezulu uma kuqhathaniswa 99 i-alumina ceramics futhi ibiza kakhulu futhi.

I-Zirconia ibuye ibe namandla ahlaba umxhwele, izakhiwo zokuguquguquka nokunwebeka kanye ne-biocompatibility – ukuyenza ilungele ukusetshenziswa kwezokwelapha njengokushintshwa kwenyonga. Ngenxa yokuguqulwa kokuqina ngaphansi kwezimo zokucindezeleka, izinhlayiya ze-zirconia ziyashintsha ukusuka efomini le-tetragonal le-metastable libe ifomu le-monoclinic, ukusiza ukuvala imifantu ngokuphumelelayo ngenkathi kukhulisa ukuqina kokuphuka.

I-CeramTec (I-Biolox Delta) ithengisa inhlanganisela ye-alumina-zirconia lapho i-zirconia engaqinile ihlala esigabeni se-tetragonal ukuze ilawule lolu shintsho futhi inikeze ukufiphala kwephuzu lokuqhekeka kanye nokuchezuka., ukuthuthukisa ukuqina kwe-alumina matrix. Okuqukethwe kwe-Zirconia kwempahla kungashintshwa ngokulungiswa kwempushana kanye namasu okuqina.

I-Thermal Shock Resistance

I-Zirconia engezwe ku-alumina matrix eyinhloko ngesikhathi sokucwiliswa ingathuthukisa kakhulu amandla nokuqina kwayo, ukudala lokho okwaziwa nge-ZTA (Zirconia Toughened Alumina), ezisebenza kahle kakhulu ze-alumina ceramics ezivamile kuzo zombili izinhlelo zokusebenza zemishini nezokugqoka.

I-alumina eqinile ye-Zirconia iphawuleka ngezakhiwo zayo ezihlukile njengokuqina kokushisa okuphezulu namandla okuhlwithwa., inertness chemical ekamelweni lokushisa, amazinga aphansi okunwebeka okushisayo kanye nokumelana nokushaqeka okuhle kakhulu kokushisa – izakhiwo ezifanele zezingxenye zokugaya kanye nezingxenye ezigqokwayo ezidinga izindlela zokupholisa.

I-CeramTec imaketha i-ZTA ebizwa nge-Biolox delta ene-alumina matrix enezinhlayiya ze-Y-TZP ezihlakazekile. (17 isisindo/wt%) kanye ne-strontium aluminate platelet (0.5 isisindo/wt%), ukuhlinzeka ngenhlanganisela esebenzayo yezindlela zokuguqula isigaba se-tetragonal-to-monoclinic kanye nezindlela zokuphambuka kwe-crack ukunikeza ukuqina okuthuthukisiwe., okwenza lokhu kube kuhle ezinqubweni eziyinhloko ze-THA ezindaweni ezithwele isifazane.

I-Insulation kagesi

I-alumina ene-Zirconia-toughened ingakwazi ukumelana nokushaqeka okushisayo ngaphandle kokuqhekeka noma ukuphuka ngaphansi kwezinguquko ezingazelelwe ezingeni lokushisa., sibonga izinhlayiya ze-alumina ezihlakazekile ezihlakazekile ngaphakathi kwe-matrix yayo ezimunca amandla ashisayo futhi zikhiqize izingcindezi ezicindezelayo ezivimbela ukuphuka..

I-alumina-zirconia ceramic iminyene kakhulu kunomlingani wayo we-zirconia omsulwa, okwenza kube ekahle izicelo zokufakelwa ugesi. Ngaphezu kwalokho, ukwanda kwayo okushisayo okuphansi kune-zirconia kuyenza ifaneleke izingxenye ezidinga ukupholisa.

Ukuguqulwa kokuqina kwezinhlanganisela ze-Alumina-zirconia kunikeza izinzuzo ezengeziwe; lapha, Izinhlamvu ze-zirconia ku-alumina matrix zingena esigabeni esikwazi ukumetastable lapho okusanhlamvu kwazo kushintsha khona kusuka ku-tetragonal kuya ku-monoclinic, ngaleyo ndlela kunciphisa ukuqhekeka okubangelwa ukucindezeleka ngokukhulisa ukumelana nokuhuzuka kanye nomthelela. I-zirconia eqinile ye-alumina ivamise ukuvela ngokusabela kwe-pyrophoric okubandakanya i-Zirconium(IV) i-oxide octahydrate, I-Aluminium Nitrate Nanohydrate Triethylamine ne-HNO3(I-Nitric Acid); ukwanda kwamasayizi wezinhlayiyana kusiza ukuhlakazeka kwezinhlamvu ze-zirconia ze-metastable.