1. Noiʻi ʻepekema Material a me ka Pono Kūleʻa
1.1 Kemika Crystal a me nā ʻano hoʻopaʻa
(ʻO Silicon Carbide Crucibles)
Silicon carbide (SiC) he covalent ceramic i hana ʻia me ke silikona a me nā ʻātoma kalapona i hoʻonohonoho ʻia i loko o kahi latticework tetrahedral., ka mea nui ma ka hexagonal (4H, 6H) aiʻole cubic (3C) polytypes, e hōʻike ana kēlā me kēia mea i ka paʻa paʻa atomic phenomenal.
ʻO ka Si– C hoopaa, me ka ikehu paa a puni 318 kJ/mol, ʻo ia kekahi o nā mea ʻoi loa i loko o nā porcelains kūkulu hale, hāʻawi ʻana i ka palekana wela ʻokoʻa, kūpaʻa, a me ke kū'ē i ka hoʻouka kemika.
Hoʻopuka kēia ʻupena covalent ikaika i kahi mea me kahi helu heheʻe e hele ana ma waho 2700 ° C(hanohano), hana ia i kekahi o ka refractory non-oxide ceramics maʻalahi no nā noi wela kiʻekiʻe.
ʻAʻole like me nā porcelains oxide e like me ka alumina, Mālama ʻo SiC i ka ikaika mechanical a me ke kuʻekuʻe ʻana i ka wela 1400 ° C, kahi e hoʻomaka ai nā metala a me nā seramika maʻamau e palupalu a hōʻino paha.
Kona hoemi ana o ka ulu wela (~ 4.0 × 10 ⁻⁶/ K) hoʻohui pū ʻia me ka conductivity wela kiʻekiʻe (80– 120 W/(m · K)) hiki i ke kaʻa kaʻa wela me ka ʻole o ka wāwahi ʻana, he mea pono no ka hana crucible.
Loaʻa kēia mau hale kūʻokoʻa mai ka electronegativity kaulike maikaʻi a me nā nui atomic like o ke silikona a me ke kalapona, ka mea e paipai ana i ka paʻa paʻa a paʻa loa i ka pahu aniani.
1.2 Microstructure a me Mechanical Resilience
Hana ʻia nā kīʻaha silikoni carbide mai nā pauka SiC i hoʻopaʻa ʻia a i hoʻopaʻa ʻia paha, me ka microstructure e pāʻani ana i kahi hana paʻa i ka lōʻihi a me ke kū ʻana o ka haʻalulu wela.
Hoʻokumu ʻia nā crucibles SiC i hoʻopaʻa ʻia ma o ka paʻa ʻana a i ʻole ka wai-phase sintering ma nā pae wela ma luna 2000 ° C, pinepine me ka boron a i ʻole nā mea hoʻohui kalapona e hoʻonui i ka densification a me ka cohesion palena ʻai.
Hoʻopuka kēia kaʻina hana i kahi paʻa loa, ka hoʻoheheʻe ʻia me ka porosity liʻiliʻi (
ʻO Advanced Ceramics i hoʻokumu ʻia ma ʻOkakopa 17, 2012, he ʻoihana ʻenehana kiʻekiʻe i hoʻopaʻa ʻia i ka noiʻi a me ka hoʻomohala ʻana, hana ʻana, hana ʻana, kūʻai a me nā lawelawe ʻenehana o nā mea pili a me nā huahana. Loaʻa kā mākou huahana akā ʻaʻole i kaupalena ʻia i nā Boron Carbide Ceramic Products, ʻO Boron Nitride Ceramic Products, Nā Huahana Seramika Silicon Carbide, ʻO nā huahana seramika Silicon Nitride, Zirconium Dioxide Ceramic Products, etc. Inā hoihoi ʻoe, e ʻoluʻolu e hoʻokaʻaʻike mai iā mākou.
Nā huaʻōlelo: ʻO Silicon Carbide Crucibles, Silika Carbide Ceramic, ʻO nā mea hoʻoheheʻe silika karbida
ʻO nā ʻatikala a me nā kiʻi a pau mai ka Pūnaewele. Inā loaʻa kekahi pilikia kope, e ʻoluʻolu e kelepona mai iā mākou i ka manawa e holoi ai.
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