He kaha teitei te pāmahana o ngā uku karawiti silicon, he ātete ki te waikura i te pāmahana teitei, he ātete pai ki te kakahu, he pumau pai ki te wera, he iti te tauwehenga o te whakawhānui wera, he nui te kawe wera, he pakeke teitei, he ātete ki te ru wera, he ātete ki te waikura matū me ētahi atu āhuatanga pai. Kua whakamahia whānuitia i roto i te motuka, te miihini, te tiaki taiao, te hangarau rererangi, te hikohiko mōhiohio, te pūngao me ētahi atu mara, ā, kua waiho hei uku hanganga kore e taea te whakakapi me te mahi tino pai i roto i te maha o ngā mara ahumahi. Na, me whakaatu e ahau ki a koe!
Te whakakorikori kore-pēhanga
Ko te sintering kore-pēhanga te tikanga tino whai hua mō te sintering SiC. E ai ki ngā tikanga sintering rerekē, ka taea te wehewehe i te sintering kore-pēhanga ki te sintering totoka-wāhanga me te sintering wai-wāhanga. Mā te β- tino pai rawa atu i tāpirihia he nui tika o te B me te C (he iti iho i te 2%) ki te paura SiC i te wā kotahi, ā, i sinteringhia te s. proehazka ki te tinana sintering SiC me te mātotoru teitei ake i te 98% i te 2020 ℃. I whakamahia a A. Mulla et al. Al2O3 me Y2O3 hei tāpiri, ā, i sinteringhia i te 1850-1950 ℃ mō te 0.5 μm β-SiC (he iti te SiO2 kei roto i te mata matūriki). Ko te mātotoru whanaunga o ngā uku SiC i whiwhi he nui ake i te 95% o te mātotoru ariā, ā, he iti te rahi o te witi, ko te rahi toharite. He 1.5 microns.
Te whakamahana i te pēhi wera
Ka taea anake te whakakorikori i te SiC parakore i te pāmahana tino teitei me te kore he tāpiringa whakakorikori, nō reira he tokomaha te hunga e whakamahi ana i te tukanga whakakorikori pēhi wera mō te SiC. He maha ngā pūrongo kua puta mō te whakakorikori pēhi wera o te SiC mā te tāpiri i ngā āwhina whakakorikori. I rangahau a Alliegro me ētahi atu i te pānga o te boron, te konumohe, te nikara, te rino, te chromium me ētahi atu tāpiringa konganuku ki te whakakīkī SiC. E whakaatu ana ngā hua ko te konumohe me te rino ngā tāpiringa tino whai hua hei whakatairanga i te whakakorikori pēhi wera SiC. I rangahau a FFlange i te pānga o te tāpiri i te nui rerekē o te Al2O3 ki ngā āhuatanga o te SiC pēhi wera. E whakaarohia ana ko te whakakīkī o te SiC pēhi wera e pā ana ki te tikanga o te whakarewa me te whakatōtō. Heoi, ka taea anake e te tukanga whakakorikori pēhi wera te whakaputa i ngā wāhanga SiC he āhua māmā. He iti rawa te nui o ngā hua e whakaputaina ana e te tukanga whakakorikori pēhi wera kotahi, kāore e pai mō te whakaputa ahumahi.
Te whakapūtanga wera isostatic
Hei whakakore i ngā ngoikoretanga o te tukanga sintering tuku iho, i whakamahia te momo-B me te momo-C hei tāpiri, ā, i whakamahia te hangarau sintering pēhi wera isostatic. I te 1900°C, i whiwhihia he uku tioata pai he nui ake te mātotoru i te 98, ā, ka taea e te kaha piko i te pāmahana rūma te eke ki te 600 MPa. Ahakoa ka taea e te sintering pēhi wera isostatic te whakaputa hua āhua matotoru me ngā āhua uaua me ngā āhuatanga miihini pai, me hiri te sintering, he uaua ki te whakatutuki i te whakaputa ahumahi.
Te whakamahana tauhohenga
Ko te karawiti silicon sintered tauhohenga, e mōhiotia ana ko te karawiti silicon here-whaiaro, e pā ana ki te tukanga e tauhohe ai te papa porowhita ki te hau, ki te wai rānei hei whakapai ake i te kounga o te papa porowhita, hei whakaiti i te porowhita, ā, ka sintered ngā hua kua oti te whakaoti me te kaha me te tika o te rahinga. Ka konatunatua te paura α-SiC me te karawiti ki tētahi ōwehenga ka whakamahanahia ki te 1650 ℃ hei hanga papa porowhita. I taua wā anō, ka uru, ka uru rānei ki roto i te papa porowhita mā roto i te Si hau, ka tauhohe ki te karawiti hei hanga β-SiC, ka honoa ki ngā matūriki α-SiC o nāianei. Ina uru katoa te Si, ka taea te whiwhi i te tinana sintered tauhohenga me te matotoru katoa me te rahi kore-mimiti. Ki te whakatauritea ki ētahi atu tukanga sintering, he iti te huringa rahi o te sintering tauhohenga i roto i te tukanga whakakīkī, ā, ka taea te whakarite i ngā hua me te rahi tika. Heoi, ko te noho o te nui o te SiC i roto i te tinana sintered ka kino ake ngā āhuatanga pāmahana teitei o ngā uku SiC sintered tauhohenga.
Wā tuku: Pipiri-08-2022