Ko te pereti whakarewa rapa uku ZTA (Zirconia Toughened Alumina) he hua ātete-kakahu hiato i hangaia mō ngā āhuatanga pakaru tino kino. Ka whakauruhia e te hua ngā uku ZTA (he mea tito i te 75%-80% Al₂O₃ me te 20%-25% ZrO₂) me te rapa taiao tino ngāwari me te pereti tautoko maitai mā te tukanga whakawairua matatau, me ngā pūtu kua whakauruhia ki mua hei ngāwari te tāutanga. Ko te rapunga whakaaro matua o te hoahoa ka whakamahi i te ātete kakahu teitei o ngā uku hei tu atu i te pakaru rauemi i te mea ka mimiti te paparanga rapa i te kaha pānga, ka tutuki ai he pānga mahi tahi i waenga i te ātete kakahu me te pakari pānga.
Nā te tikanga whakapakari i te hurihanga ā-wāhanga o te zirconia, he nui ake te pakari o te pakaru me te ātete ki te kakahu o te ZTA i ngā uku alumina tuku iho. E whakaatu ana ngā rangahau ko ngā hiato ZTA kei roto ko te 20%-25% zirconia e whakaatu ana i te mahi tino pai i raro i ngā āhuatanga pānga-paheketanga kino. Ko ngā whakatakotoranga hangarau noa ko: te kiato papatipu ≥4.1-4.3 g/cm³, te pakeke o Rockwell (HRA) ≥90, te pakari o te pakaru (KIC) ≥3.70 MPa·m1/2, me te kaha piko >350 MPa. I roto i ngā whakamātautau kakahu reti maroke, ka taea e te tere kakahu motuhake o ngā hiato ZTA te iti iho i te 10⁻⁹ mm³/(N·m), he nui ake te pai ake i ngā uku alumina kotahi-wāhanga, zirconia rānei.
Ko te tukanga hanga he whakamomona wera e whakahaeretia ana kia tino kaha te hononga i te hononga uku-rapa. E ai ki ngā paerewa ahumahi, me neke atu i te 3.5 MPa te kaha o te hononga kutikuti i waenga i te uku me te rapa, me te kaha kume o te paparanga rapa tonu o te 12-15 MPa me te roa i te whati neke atu i te 250%-400%. Mā te hanganga hiato whakamomona ka ārai i te wetewete o ngā taera uku i raro i te pānga, ā, mā te rerekētanga o te rapa ka whakamarara i te ahotea kukū, ka tiaki i te paparanga uku mai i te pakaru pakarukaru. Mā te pereti tuara maitai ka pakari te hanganga ina whakairihia ki runga i ngā anga taputapu.
Ngā pereti whakamomona rapa uku ZTAe whakamahia ana i roto i ngā awa whakawhiti, ngā pekepeke, me ngā ipu o ngā pūnaha whakahaere rauemi papatipu kei reira te pānga me te karawarawa. Ki te whakatauritea ki ngā arai uku alumina parakore, e 2.5 ngā wā roa ake te roa o te ratonga a ZTA i raro i ngā āhuatanga karawarawa pānga, engari he iti ake te utu i ngā uku zirconia parakore, e whakarato ana i te whai huatanga utu tino pai. Mō ngā tono e whakahaere ana i ngā rauemi nui, ngā teitei maturuturu teitei, ngā tere rere teitei rānei, ko ngā pereti whakamomona rapa ZTA tetahi o ngā otinga tiaki kakahu tino pono e wātea ana.
Wā tuku: 24-Pepuere-2026