Khulisa Ukuqina Nge-Zirconia Toughened Alumina Components

Izitsha zobumba ze-ZTA zinikeza izici eziphakeme ze-tribological uma ziqhathaniswa nezinsimbi ezivamile ze-alumina ceramics, okwenza kube yisinqumo esifanele samathuluzi okusika, ama-bearings, amaphampu kanye nezingxenye zokulawula uketshezi.

Ngaphansi kwengcindezi, izinhlayiya ze-zirconia zishintsha kusuka ezinhlakeni zekristalu ye-tetragonal e-metastable kuya kwe-monoclinic, ikhiqiza ukunwetshwa kwevolumu ecindezela imifantu ku-alumina matrix futhi ithuthukise kakhulu ukuqina kokuphuka.

Gqoka Ukumelana

Zirconia Toughened Alumina (I-ZTA) iyimpahla ehlala isikhathi eside kakhulu. Ingakwazi ukumelana nokuhuzuka komthelela noma ukuguga okushayisanayo ngaphandle kokulimala; okwenza kube yisinqumo esihle kakhulu sempahla yokusika amasondo. Ngaphezu kwalokho, I-ZTA ingamelana namazinga okushisa aphezulu ngaphandle kokulimala noma ukucekelwa phansi.

I-ZTA imelana kakhulu nokugqwala kwamakhemikhali, ukwenza kube yisinqumo esihle kakhulu sezinto ezifakwayo zezokwelapha. I-Biocompatible futhi ikwazi ukumelana nokuthinta uketshezi lomzimba, I-ZTA iphinde ibe namandla aphezulu okuguquguquka – ilungele izinhlelo zokusebenza zokushintshwa kwe-hip.

I-ZTA idalwe ngokuguqulwa okubangelwa ukucindezeleka kwezinhlayiya ze-tetragonal zirconia ezinhle zibe yisimo se-monoclinic. Lokhu kwandisa ukuqina kokuphuka ngokwandisa indawo ezungeze imifantu. Kanjalo, I-ZTA ifakazela ukuthi inamandla kakhulu futhi ihlala isikhathi eside kune-alumina yokugqoka.

Ukumelana Nokugqwala

Zirconia Toughened Alumina (I-ZTA) iyinsimbi ye-ceramic ethuthukisiwe esetshenziswa kabanzi embonini ngamandla ayo, ubulukhuni, ukumelana nokugqoka kanye nezakhiwo zokumelana nokugqwala. I-ZTA ithola izinhlelo zokusebenza kuyo yonke imikhakha eminingi ehlanganisa eyezimoto kanye ne-aerospace yezingxenye ezifana nezingxenye zenjini, izinjini zegesi kanye nezingxenye zemishini ngenkathi zisebenza njengezinto zokugqoka kumaphampu, ama-seal kanye namathuluzi okusika asetshenziselwa izinhlelo zokusebenza zemishini. Abahlinzeki emkhakheni wezokwelapha bangasebenzisa le nto ngenxa yokuhambisana kwayo nemvelo.

Ukuqina kulokhu okuqukethwe kuvela enqubweni yayo yokuguqula ebangelwa ingcindezi, lapho izinhlayiya ze-zirconia ku-alumina matrix zishintsha zibe izakhiwo ze-monoclinic ngokusebenzisa ukucindezeleka okuguqula ukuguqulwa kokuqina., ukusiza ukuvala imifantu futhi kwandise ukuqina kokuphuka, ngaleyo ndlela izivikele ekulimaleni ezindaweni ezihlukahlukene njenge-phosphoric acid, sulfuric acid namanzi distilled. Lokhu kuvumela ukuthi imelane nokugqwala.

Amandla Aphakeme

Ukuhlanganisa i-alumina ne-zirconia kuphumela ekwenyukeni kwamandla nokuqina kokuphuka uma kuqhathaniswa ne-alumina evamile, ukwenza i-ZTA ibe ukukhetha okuhle kakhulu kwezingxenye ezingaphansi kokulayishwa komthelela. Ngaphezu kwalokho, I-ZTA iphinde ibe nokumelana nokugqwala kwamakhemikhali okukhulu.

I-ZTA iziqhayisa ngobulukhuni namandla aphakeme ngenxa yokuguqulwa kwezinhlayiya ze-tetragonal zirconia zibe amakristalu e-monoclinic ngokuguqulwa okubangelwa ukucindezeleka ngokulayisha ngomshini noma ukushintshashintsha kwezinga lokushisa., kanye nokucindezela okulandelayo okuvela ekwakhekeni kwekristalu ye-monoclinic zirconia ecindezela i-alumina matrix, eyinika amandla amakhulu, ukuqina, kanye nokumelana nokushaqeka okushisayo.

Le ceramic eyingqayizivele futhi inamandla okugoba aphezulu kakhulu kanye ne-coefficient ephansi yokwandisa okushisayo, ukuyenza iphelele ezinhlelweni ezidinga izindlela zokupholisa. Ngaphezu kwalokho, ukumelana kwayo namakhemikhali abolayo – kuhlanganise noketshezi lomzimba – kwenza izimila zezokwelapha zilungele ukubekwa ngaphakathi kwabantu ngaphandle kwengozi yokuwohloka ngokuhamba kwesikhathi okuvumela iziguli ukuba zijabulele okuhlangenwe nakho okunethezekile ngaphandle kokukhathazeka ngokuwohloka kokufakelwa ngokuhamba kwesikhathi.

Ukuqina Okuphakeme

Izitsha zobumba ze-ZTA zithuthukisa ukuqina kwe-alumina ngokuguqulwa okubangelwa ukucindezeleka kwezinhlayiya ze-zirconia zibe ezinhle., kufinyelelwa ngokucindezela kanye nokucindezela kwe-isostatic okushisayo (I-HIP). Kuye ngokuthi ingakanani i-zirconia ekhona ku-matrix yayo, I-ZTA ingase ibe nezakhiwo eziqinile eziphansi noma eziphakeme.

UClausen uboniswe ku 1976 ukuthi omatikuletsheni be-alumina aqukethe i-zirconia engaqinile bangase baqiniswe ukuze kuthuthukiswe izakhiwo zemishini ngokufaka amakristalu e-zirconia angazinzile njengama-metastable precipitates ahlakazeke kahle., njengalezo ezakhiwe ngamakristalu e-zirconia angazinzile, ukuthuthukisa izakhiwo zemishini. Wafakazela leli phuzu ngokusebenzisa i-crack propagation; lapho imifantu iqhubekela phambili ngempahla futhi icindezela indawo yayo ngaphambi kwephuzu layo ingashintsha ibe yisigaba se-monoclinic futhi iguqulele kuso kalula kunokuba bekungenzeka ngenye indlela..

Le ndlela yokuqinisa inyusa amandla okuguquguquka kanye nokuqina kokuphuka kwe-alumina ngenkathi ngasikhathi sinye ikhulisa ubulukhuni., ukudala into ehlanganisiwe engenakuqhathaniswa efanele izinhlelo zokusebenza ezidinga ubulukhuni obukhulu, ukuqina, ukumelana nokuqhekeka kanye nezidingo zokupholisa njengabasiki bezimboni, izingxenye zokugqoka zokugaya noma izingxenye zokupholisa.