Tearai rapa uku alumina ātete-kakahuHe rauemi hiato e whakamahia whānuitia ana i roto i te mara o te tiaki kakahu ahumahi. Ka whakaroa ake i te roa o te mahi a ngā taputapu i raro i ngā āhuatanga uaua mā te whakakotahi i te ātete kakahu teitei o te uku alumina me ngā āhuatanga whakaruru o te rapa. Ka whakamahia e tēnei arai te alumina hei rauemi mata matua, me te tāpiri i te paura uku me te waikura silicon, i whakakoihia i ngā pāmahana teitei tata ki te 1700°C. Ko tōna ihirangi alumina he iti iho i te 95%, ka eke te mātotoru ki te 3.5-3.9 g/cm³, ā, ko te pakeke o Rockwell he teitei ki te HRA85-90, e whakarite ana i te ātete kakahu pai rawa atu. I roto i ngā tono mahi, he hanganga hiato maha-paparanga tēnei arai: ko te paparanga o runga he uku alumina, ko te waenganui he paparanga rapa, ā, ko te raro he pereti maitai tautoko. Ka honoa pai ēnei paparanga e toru mā te tukanga whakamomona, ka hanga he pūnaha tiaki kakahu kotahi.
Ko te mahi tino pai o tēnei arai hiato e whakaatahia ana i roto i ngā āhuatanga maha: Tuatahi, he tino pai tōna ātete ki te kakahu, me te pakeke o te uku korundum alumina e eke ana ki runga ake i te HRA85, ā, ko te ātete kakahu e neke atu i te 200 ngā wā i te maitai waro noa. Tuarua, he pai te ātete pānga o te hua. Nā te tauira uku pakari me te hoahoa porowhita ahurei, me te paparanga ārai rapa, ka taea e ia te ātete pai ki te pānga o ngā rauemi nui. Tuatoru, he pai te ātete wera o te arai, ā, ka taea te mahi pumau i roto i te awhe pāmahana mai i te 0°C ki te 250°C mō ngā wā roa. Hei tāpiri, ka whakamahia e te paparanga rapa he tauira motuhake me te ātete waikawa me te kawakore, ka taea te ātete ki te waikura i roto i ngā taiao waikawa ngoikore me te kawakore ngoikore. Mō ngā āhuatanga ā-tinana, ko te kaha pēhi o te arai he ≥850 MPa, ko te pakari whati KΙC ≥4.8 MPa·m1/2, ko te kaha here i waenga i te rapa me te uku (aukati kutikuti) ≥3.0 MPa, ā, ko te roa o te ora koroheketanga o te rapa he ≥15 tau, e whakarite ana i te pono o te hua mō te wā roa.
He whānuitia te whakamahinga o ngā arai rapa uku alumina ātete-kakahu i roto i ngā mara ahumahi, tae atu ki ngā pūnaha kawe waro pūngao ahi, ngā oko tipu rino, ngā awa keri maina, ngā taputapu horoi waro, ngā pūnaha kawe tipu sima, me ētahi atu taiao kua tino tawhito. I roto i ngā mahi whaihua, ka wehea ngā arai ki ngā momo rerekē pērā i te here, te whakarewa, me te rapa whakakotahi, tae atu ki ngā momo whakatakotoranga pērā i te tapawhā totoka, me ngā kōhao porowhita, me ngā paipa trapezoidal. Ka taea te tapahi me te piko kia rite ki te āhua o te taputapu, e tutuki ai ngā hiahia tāutanga mō ngā taputapu āhua motuhake. Mā te hoahoa modular ka māmā ake te tāutanga me te whakakapinga, ka whakaitihia te wā me ngā utu tiaki taputapu. I roto i te kaupapa whakawhiti hangarau keri me te tukatuka matomato atamai 4.5 miriona tana o Dundee Mining, i whakamahia e te ipu huri ngā arai uku paerewa teitei me te ihirangi alumina pai K95 ≥95% me te mātotoru ≥3.8 g/cm³, e whakaatu ana i tōna pono i roto i ngā kaupapa ahumahi nui.
Wā tuku: Whiringa-ā-rangi 20-2025