ʻO ka ʻai no ka Graphite Silicon Carbide Crucibles: He Ki no ka Metallurgy Hana Kiʻekiʻe

I ka honua o ka metallurgy a me ka ʻepekema waiwai,ka ipuhaohe mea pono no ka hoohehee a me ka hoolei ana i na metala. Ma waena o nā ʻano crucibles like ʻole, kū ʻia nā crucibles graphite silicon carbide (SiC) no ko lākou mau waiwai kūʻokoʻa, e like me ka conductivity thermal kiʻekiʻe, ke kūpaʻa haʻalulu maikaʻi loa, a me ke kūpaʻa kemika maikaʻi. Ma kēia ʻatikala, e ʻimi mākou i ka meaʻai no ka graphite SiC crucibles a e ʻimi i ke ʻano o kā lākou haku mele ʻana i kā lākou hana kupaianaha i nā noi wela kiʻekiʻe.

Na Mea Kumu

ʻO nā mea nui o ka graphite SiC crucibles he flake graphite a me ka silicon carbide. ʻO ka flake graphite, ka mea maʻamau he 40% -50% o ka crucible, hāʻawi i ka conductivity thermal maikaʻi loa a me ka lubricity, e kōkua i ka hoʻokuʻu maʻalahi o ka metala. ʻO Silicon carbide, e hana ana i ka 20% -50% o ka crucible, ke kuleana o ke kūpaʻa haʻalulu wela kiʻekiʻe o ka crucible a me ke kūpaʻa kemika i nā wela kiʻekiʻe.

Nā ʻāpana ʻē aʻe no ka hana i hoʻonui ʻia

No ka hoʻomaikaʻi hou ʻana i ka hana wela kiʻekiʻe a me ke kūpaʻa kemika o ka crucible, ua hoʻohui ʻia nā mea ʻē aʻe i ka meaʻai:

1. Elemental silicon pauka (4% -10%): Hoʻonui i ka ikaika kiʻekiʻe-mehana a me ka pale ʻana o ka oxidation o ka crucible.
2. Boron carbide pauda (1% -5%): Hoʻonui i ka paʻa kemika a me ke kū'ē i nā metala corrosive.
3. Pālolo (5% -15%): Hana ʻia ma ke ʻano he mea hoʻopaʻa a hoʻomaikaʻi i ka ikaika mechanical a me ke kūpaʻa wela o ka crucible.
4. ʻO ka mea hoʻopili Thermosetting (5%-10%): Kōkua i ka hoʻopaʻa ʻana i nā ʻāpana āpau e hana i kahi ʻano hui.

ʻO ke kumu hoʻohālike kiʻekiʻe

No nā noi e koi ana i ka hana ʻoi aku ka kiʻekiʻe, hoʻohana ʻia kahi ʻano graphite crucible kiʻekiʻe. He 98% ka graphite particles, 2% calcium oxide, 1% zirconium oxide, 1% boric acid, 1% sodium silicate, a me 1% alumini silicate i loko o kēia kumuhana. Hāʻawi kēia mau mea ʻokoʻa i ke kūpaʻa like ʻole i nā wela kiʻekiʻe a me nā wahi kemika koʻikoʻi.

Kaʻina Hana Hana

ʻO ka hoʻomākaukau ʻana i nā crucibles graphite SiC e pili ana i kahi kaʻina meticulous. I ka hoʻomaka ʻana, hui pū ʻia ka flake graphite a me ka silika carbide. A laila, hoʻohui ʻia ka pauka silika elemental, ka pauka boron carbide, ka pālolo, a me ka mea hoʻopili thermosetting i ka hui. A laila kaomi ʻia ka hui ʻana i ke ʻano me ka mīkini paʻi anu. ʻO ka hope loa, hoʻopaʻa ʻia nā crucibles i loko o kahi umu wela wela e hoʻonui ai i ko lākou ikaika mechanical a me ke kūpaʻa wela.

Nā noi a me nā pono

Hoʻohana nui ʻia ʻo Graphite SiC crucibles i ka ʻoihana metallurgical no ka hoʻoheheʻe ʻana a me ka hoʻolei ʻana i nā metala e like me ka hao, ke kila, ke keleawe, a me ka alumini. ʻO kā lākou hana wela wela e hōʻoia i ka hoʻomehana like ʻana a hoʻemi i ka hoʻohana ʻana i ka ikehu. ʻO ke kūpaʻa haʻalulu wela kiʻekiʻe e hōʻemi i ka pilikia o ka haki ʻana i ka wā e hoʻololi wikiwiki ai ka mahana, ʻoiai ʻo kā lākou paʻa kemika e hōʻoia i ka maʻemaʻe o ka metala i hoʻoheheʻe ʻia.

I ka hopena, ʻo ka mea ʻai no ka graphite silicon carbide crucibles he mea hoʻohui maikaʻi ʻia o nā mea e hāʻawi ai i ke kaulike o ka thermal conductivity, thermal shock resistance, a me ka paʻa kemika. ʻO kēia haku mele he mea koʻikoʻi lākou i ke kahua o ka metallurgy, kahi e hana nui ai lākou i ka hoʻoheheʻe ʻana a me ka hoʻolei ʻana o nā metala.

Ma ka hoʻomaopopo ʻana i nā ʻāpana a me ke kaʻina hana o ka graphite SiC crucibles, hiki i nā ʻoihana ke hana i nā koho ʻike no kā lākou mau noi kikoʻī, e hōʻoia i ka hana maikaʻi loa a me ka lōʻihi o kā lākou crucibles. Ke holomua nei ka ʻenehana, ua manaʻo ʻia ka hoʻonui hou ʻana i ka ʻenehana a me nā ʻenehana hana o ka graphite SiC crucibles, e hoʻolalelale ana i ke ala no nā kaʻina metallurgical ʻoi aku ka maikaʻi a hoʻomau.