ʻO ka ʻokoʻa ma waena o ka graphite crucible silicon carbide a me ka graphite crucible

Aia nā ʻokoʻa nui ma waenanā kīʻaha kalapona silikaa me graphite crucibles ma nā ʻano he nui e like me nā mea waiwai, nā kaʻina hana, ka hana, a me nā kumukūʻai. ʻAʻole pili wale kēia mau ʻokoʻa i kāna kaʻina hana, akā hoʻoholo pū i kona pono a me nā hiʻohiʻona noi.

ʻokoʻa nui
Hana ʻia nā kīʻaha graphite me ka graphite flake maoli a hoʻohana i ka pālolo i mea hoʻopili. Hāʻawi kēia hui ʻana i ka graphite crucible maikaʻi loa i ka thermal conductivity a me ke kūpaʻa wela kiʻekiʻe, kūpono ia no nā noi i nā kaʻina hoʻoheheʻe wela kiʻekiʻe. ʻO ke ʻano kūʻokoʻa a me ka conductivity thermal kiʻekiʻe o ka graphite flake maoli i kaulana loa i nā crucibles graphite i ka ʻoihana metallurgical a me ka foundry.

Hoʻokumu ʻia ʻo Silicon carbide crucible ma ka graphite flake maoli, me ka silicon carbide ka mea nui a me ka resin wela kiʻekiʻe e like me ka binder. Ma ke ʻano he mea paʻakikī loa, ʻoi aku ka nui o ka pale ʻana o ka carbide silicon a me ke kūpaʻa wela, e ʻae ana i nā crucibles silicon carbide e hoʻohana ʻia i nā wahi ʻoi aku ka paʻakikī. ʻO ka hoʻohana ʻana i ka resin wela kiʻekiʻe e hoʻonui i ka ikaika holoʻokoʻa a me ka lōʻihi o ka crucible.

ʻokoʻa kaʻina hana
ʻO ke kaʻina hana o ka graphite crucible e hilinaʻi nui ʻia i ke kaomi manual a me ka mīkini. Hoʻokumu pinepine ʻia nā crucibles graphite liʻiliʻi e ka mīkini kaomi, a laila sintered i loko o kahi kiln ma kahi kiʻekiʻe o 1,000 degere, a hope i uhi ʻia me ka anti-corrosion glaze a i ʻole ka pena i hoʻomaʻemaʻe ʻia e hoʻonui i ka paʻa a me ka pale ʻana. ʻO kēia kaʻina hana kuʻuna, ʻoiai ke kumu kūʻai, he mau palena i ka ʻōlelo o ka hana pono a me ka kūlike o ka maikaʻi.

ʻO ke kaʻina hana o ka silicon carbide crucible he mea holomua loa, me ka hoʻohana ʻana i nā mea paʻi isostatic a me ke ʻano ʻepekema. Hoʻohana ka ʻenehana kaomi Isostatic i ke kaomi like ʻole (a hiki i ka 150 MPa), ka hopena i ke kiʻekiʻe kiʻekiʻe a me ke kūpaʻa ʻana i ka crucible. ʻAʻole hoʻomaikaʻi wale kēia kaʻina i ka ikaika mechanical o ka crucible, akā hoʻonui nui i kona kūʻē ʻana i ka haʻalulu wela a me ka corrosion.

Nā ʻokoʻa hana
Ma ke ʻano o ka hana, aia nā ʻokoʻa nui ma waena o nā crucibles graphite a me nā crucibles silicon carbide. He 13 kA/cm² ka nui o ka graphite crucibles, oiai he 1.7 a hiki i ka 26 kA/mm² na crucibles silicon carbide. ʻO ke ola lawelawe o ka graphite crucibles he 3-5 mau manawa o ka silicon carbide crucibles, ʻo ia ka mea nui ma muli o ka ikaika o ka waiwai a me ke kūpaʻa ʻana o nā crucibles silicon carbide.

Eia kekahi, ʻo ka ʻokoʻa wela ma waena o loko a me waho o ka graphite crucible ma kahi o 35 degere, ʻoiai ʻo ka ʻokoʻa wela o ka silicon carbide crucible he 2-5 degere wale nō, e hana ana i ka silicon carbide crucible i ʻoi aku ka maikaʻi ma ke ʻano o ka mālama ʻana i ka mahana a me ka wela. kūpaʻa. ʻOi aku ka kiʻekiʻe o ka ʻakika a me ka alkali a me ka corrosion o nā crucibles silicon carbide ma mua o nā crucibles graphite, kahi e hoʻomaikaʻi maikaʻi ai i ka ikehu a mālama i kahi 50% ikehu ma mua o nā crucibles graphite.

okoa ma ke kumukuai
Ma muli o nā ʻokoʻa o nā mea hana a me nā kaʻina hana, ʻo nā crucibles graphite a me nā crucibles silicon carbide pū kekahi he ʻokoʻa kumu kūʻai. ʻO ka mea maʻamau, ʻoi aku ka nui o ke kumukūʻai o nā crucibles carbide silika ma mua o graphite crucibles. Hōʻike kēia ʻokoʻa kumu kūʻai i nā pono nui o nā crucibles silicon carbide e pili ana i ke kumukūʻai waiwai, ka paʻakikī o ka hana hana a me ka hana.

I ka hōʻuluʻulu ʻana, ʻoiai ʻoi aku ka nui o ke kumukūʻai o nā crucibles silicon carbide, ko lākou ʻoi aku ka lōʻihi, ka pale ʻana i ka corrosion, a me ka ikaika o ka ikehu e lilo lākou i koho ʻoi aku ka maikaʻi no nā noi koi nui. Hoʻohana nui ʻia nā crucibles graphite i nā noi kuʻuna ma muli o ko lākou kumu kūʻai haʻahaʻa a me nā waiwai kumu maikaʻi. ʻO nā pono a me nā hemahema o kēia mau crucibles ʻelua e hoʻoholo ai he kūpono lākou no nā hiʻohiʻona noiʻi like ʻole.