i-zirconia i-alumina eqinile ifakazele izakhiwo zayo eziphakeme zemishini uma iqhathaniswa ne-monolithic zirconia, kuhlanganise nokuqina kokuphuka namandla okuguquguquka. Ukuzinza kwe-ZTA kuvela esigabeni sayo se-matrix esivikela futhi sikhawulele ukuguqulwa kwezinhlamvu ze-tetragonal zirconia, ukuyisiza imelane nokuwohloka ngaphansi kwezimo ze-in-vivo hydrothermal.
Amandla e-Flexural
Ngokungeza i-zirconia ku-alumina ceramics, I-alumina eqinile ye-zirconia iyadalwa. Lokhu okubalulekile kuhlanganisa amandla aphakeme okuguquguquka nokuqina komshini ezimeni ezikufunayo, futhi imelana nokugqwala kwamakhemikhali kanye nokuchayeka oketshezini lomzimba.
I-zirconia eqinile i-alumina ingamelana nokushintshashintsha ngokushesha kwezinga lokushisa ngenxa yezinhlayiya zayo ze-zirconia ezihlakazeke ngaphakathi kwe-alumina matrix emunca amandla ashisayo futhi idale izingcindezi ezicindezelayo ukuvimbela ukuqhekeka., ukuyenza ifaneleke ukusetshenziswa ezimbonini ezahlukahlukene ezifana nezingxenye zesithando somlilo kanye nezinjini ze-steam turbine.
Le Ceramic eyinhlanganisela ihlanganisa izimfanelo ezihlaba umxhwele kokubili i-alumina ne-zirconia ukuletha amandla engeziwe kanye nokumelana nokushaqeka okushisayo., ngobulukhuni obuphakeme, amandla e-flexural, ukuqina kokuphuka kanye nokumelana nokugqoka okudlulayo 99% i-alumina emsulwa mayelana nobulukhuni, ukuqina nokumelana nokugqoka.
Ukuphuka Kokuqina
I-Zirconia ithuthukisa ukuqina kokuphuka kwe-alumina ceramics ngokuguqula ukuqina. Lapho hit, i-metastable yttrium-stabilised zirconia ishintsha ibe yi-monoclinic crystal structures ekhiqiza ingcindezi ecindezelayo evimbela ukusakazeka kokuqhekeka..
I-Zirconia toughened alumina iyinto ekahle yokwakha amathuluzi okusika ngenxa yokuqina kwayo, ukuzinza okushisayo nokumelana nokungqubuzana. Ngaphezu kwalokho, izici zayo eziphakeme zemishini zifaka isandla kakhulu ekuqineni nasekuthembekeni kwayo.
I-ZTA ekhiqizwa nge-gelcasting inenhlanganisela eyingqayizivele yamandla aguquguqukayo, ukuqina kwe-fracture, i-biocompatibility kanye nokumelana nokushisa/ukugqwala okuyenza ifanelekele ukuhlinzwa esikhundleni se-hip. Ngezinqubo ze-gelcasting kuyenzeka futhi ukuthi ulungise imingcele yayo yokuqina-ukuphuka kokuqina-flexural ngokushintsha amazinga okulayisha aqinile., ukujiya kwesikhunta noma amapharamitha wokushisa we-sintering ukuze wandise imiphumela.
I-Stress-Strain Curves
I-zirconia ye-alumina eqinile inamandla amakhulu nokumelana nokugqoka, kanye nokuqina okukhethekile kokusekela imithwalo esindayo ngaphandle kokukhubazeka ngaphansi kwengcindezi. Ngaphezu kwalokho, inokumelana nokushaqeka okuhle kakhulu okuyenza ikwazi ukubekezelela ukuguquguquka okungazelelwe kwezinga lokushisa ngaphandle kokuhlupheka.
Okuqukethwe kwe-Zirconia ngaphezu komkhawulo othile kwandisa ukuwohloka kokuguga ngokusebenzisa ama-microcracks adalwe ngesikhathi sokupholisa ngemva kokucwiliswa okusebenza njengemizila ekhethwayo yokungena kwamanzi ezintweni zobumba., okuholela ekwakhekeni kwama-microcracks ngesikhathi sokupholisa asebenza njengezindlela ezikhethwayo zokungena kwawo nokusabalala kuwo. Ngokuphambene, lapho ngaphansi kwalo mngcele izinhlayiya ze-zirconia zithola ukuguqulwa okubangelwa ukucindezeleka kusuka esigabeni se-tetragonal kuya esigabeni se-monoclinic esinciphisa ukuwohloka kokuguga..
Amandla Okuqina
I-Zirconia toughened alumina iyimpahla eqinile futhi ehlala isikhathi eside enokumelana okuhle nokugqokwa kanye nezakhiwo zokuzinza ezishisayo, ukuyenza ilungele izingxenye ezidinga ukupholisa. Ukwengeza, izindawo ezizinze ngokufudumeza ezifana nalezi zihlinzeka ngokulawula okushisayo kanye nokumelana nokungqubuzana okuzenza zibe ukukhetha okuhle kwempahla..
Ngaphansi kwengcindezi, I-ZTA yenza uguquko lwesigaba ukusuka ku-tetragonal ukuya ku-monoclinic okuvimbela ukwanda kokuqhekeka futhi kwandise ukuqina kokuphuka., kodwa ezinye izifundo zibonisa ukuthi ukwanda kwe-zirconia engaqinile kuholela ekunciphiseni amandla okudonsa.
Izitsha zobumba ze-ZTA ngokuvamile ziqukethe 10%-20% i-zirconia, okuyinto evumela ukuthi yakhelwe ngokukhethekile uhlelo lokusebenza ngalunye. I-ZTA ihambisana ne-biocompatible, ukumelana nezinga lokushisa, ukumelana nokugqwala, iqine ngokwanele ukumelana nengcindezi, enye indlela engabizi kakhulu kuma-ceramics e-zirconia ahlanzekile futhi ingamelana namazinga okushisa aphezulu ngaphandle kokuwohloka. Abakhiqizi be-valve seal bavame ukuyikhetha ngenxa yamandla ayo okumelana nokugqwala nokubamba ingcindezi. – zonke izici ezilungele ukusetshenziswa kwe-valve seal.
Amandla Omthelela
i-zirconia iqinile i-alumina imelana nokugqwala futhi inamandla akhethekile, ukuzenza zifaneleke izinhlelo zokusebenza ezidinga ubulukhuni kanye nokuqina kanyekanye. Ngaphezu kwalokho, I-ZTA inikeza ukonga izindleko ngaphezu kwezitsha zobumba ezihlanzekile ze-zirconia.
Ukuhlanganisa i-alumina ne-zirconia kwakha i-ceramic enamandla aphakeme aguquguqukayo, ukuqina kwe-fracture, futhi ukumelana nokugqoka kune-alumina ehlanzekile. Ingakwazi ukumelana nemithwalo ephezulu nemithelela futhi ivamise ukusetshenziswa njengokuthuthukiswa kwe-alumina evamile emiklameni edinga izici ezengeziwe..
Ukuqina kwenguquko kubangela lawa mandla anda; ngaphansi kwezimo zokucindezeleka, izinhlayiya ze-zirconia ziyashintsha ukusuka ku-tetragonal ukuya ekumeni kwe-monoclinic futhi zanda, ukucindezela imifantu ku-alumina matrix futhi ngaleyo ndlela kuholele emandleni aguquguqukayo aphezulu kune-YSZ (Izibalo 6c kanye no-d).
Ukumelana Nokugqwala
Inhlanganisela ye-ZTA ceramic ye-alumina ne-zirconia inikeza ukumelana nokugqwala okuphakeme uma kuqhathaniswa nokumsulwa 99% izinto ze-alumina zodwa, futhi inobulukhuni obuphakeme, ukuqina kwe-fracture, amandla e-flexural, kanye nezakhiwo zobulukhuni kunezimbangi zayo.
I-ZTA ifaka ukugqokwa okuvelele kanye nokumelana nokuhuzuka nokuhambisana namakhemikhali, ukuyenza ibe ilungele izinhlelo zokusebenza zezimboni ezidinga ukuqina okuphezulu kwemishini. Ngaphezu kwalokho, inhlanganisela yezinto ziqhayisa ukumelana nokushaqeka okushisayo okuvumela izinguquko ezisheshayo ngaphandle kokuqhekeka noma ukuphuka.
Izinhlayiya ze-Zirconia ezengezwe ku-alumina matrix zandisa ukuqina kwayo kokuphuka ngokuguqula ukuqina., umphumela obangelwa ukucindezeleka kwezinhlayiya ze-zirconia ezishintsha kusuka ku-tetragonal kuya ezinhlakeni zekristalu ze-monoclinic lapho zivezwe ekucindezelekeni kokucindezela, ukukhiqiza izingcindezi ezicindezelayo ezivimbela ukusakazeka kokuqhekeka futhi kukhulisa kakhulu ukuqina kwayo kokuphuka.
I-Thermal Shock Resistance
i-zirconia toughened alumina iyi-ceramic ethuthukisiwe ehlanganisa i-alumina ne-zirconia. Ukwakha i-ZTA, i-zirconia yethulwa ku-alumina matrix eyinhloko ngaphambi kokucwiliswa ukuze ithole amandla engeziwe kanye nokumelana nokushaqeka okushisayo phezu kwezitsha zobumba ze-alumina zendabuko.; ngaphezu kwalokho iqhosha ngobulukhuni obuphakeme, amandla e-flexural, kanye nokuminyana kunomlingani wayo.
I-ZTA toughening mechanism ibandakanya ukuguqulwa kwesigaba esibangelwa ukucindezeleka kusuka ku-tetragonal kuya ezinhlayiyeni zekristalu ye-zirconia ye-monoclinic., ukwandisa ukuqina kokuphuka ngenkathi ivikela ekushayweni okushisayo kanye nokuhuzuka komshini. i-zirconia i-alumina eqinile ihambisana kakhulu nezinto eziphilayo futhi ayigqwali ngokushesha, okwenza kube kuhle kuma-valve seal. Ngaphezu kwalokho, amandla ayo aphezulu okuguquguquka avumela ukuthi imelane nokucindezela komzimba ngokuphumelelayo.