ʻO ka hoʻonohonoho ʻana i ka 5% a hiki i ka 10% (ka hapa nui) Al2O3 i loko o ka ʻāpana matrix o ka umu pahu kalapona/graphite bricks (carbon blocks) e hoʻomaikaʻi nui i ka pale ʻana o ka hao i hoʻoheheʻe ʻia a ʻo ia ka hoʻohana ʻana i nā pōhaku lepo kalapona alumini i nā ʻōnaehana hana hao. ʻO ka lua, hoʻohana ʻia nā pōhaku kalapona alumini i ka hoʻoheheʻe ʻana i ka hao i hoʻoheheʻe mua ʻia a me nā pā pā.
Aluminum kalapona pōhaku lepo no ka hao hoohehee pretreatment
Hoʻohana nui ʻia nā pōhaku lepo silicon carbide i nā lako no ka lawe ʻana i ka hao i hoʻoheheʻe ʻia e like me nā pahu hao i hoʻoheheʻe ʻia. Eia nō naʻe, ke hoʻohana ʻia kēia ʻano mea refractory i loko o nā pahu hao i hoʻoheheʻe ʻia a me nā hui hui hao, a hālāwai me ka hoʻomehana ʻana a me nā kūlana hoʻoluʻu, hiki ke maʻa, e alakaʻi ana i ka peeling structural. Eia kekahi, no ka mea, ʻo ka Al2O3-SiC-C pōhaku lepo i hoʻohana ʻia i loko o nā pahu metala wela nui a me nā hui hui hao he 15% ke kalapona a me ka conductivity thermal e like me 17 ~ 21W/(m·K) (800 ℃), aia ma laila. he hoemi ka wela o ka hao i hooheheeia a me ka pilikia o ka hoololi ana i na pepa hao o na pahu hao nui i hooheheeia a hui pu i na kaa. ʻO ka countermeasure ka loaʻa ʻana o ka haʻahaʻa haʻahaʻa haʻahaʻa ma o ka wehe ʻana iā SiC, kahi mea hoʻoheheʻe wela loa, ʻoiai e hōʻemi ana i ka ʻike graphite a hoʻomaʻemaʻe i ka graphite.
Ma o ka noiʻi kumu, ua hoʻoholo ʻia:
(1) Ke emi iho ka graphite ma lalo o 10%, aia ka Al2O3 e hana ana i ka matrix mau, a ua hoopihaia ke kalapona ma ke ano o na kiko hoku. I kēia manawa, hiki ke helu ʻia ka conductivity thermal λ o ka alumini kalapona pōhaku lepo ma ke ʻano (1)
I loko o ke kumuhana, λa ka hoʻoili wela o Al2O3; ʻO Vc ka hakina leo o ka graphite. Hōʻike kēia ʻaʻohe mea pili i ka conductivity thermal o nā pōhaku kalapona alumini me ka conductivity thermal o graphite.
(2) Ke hoʻomaʻemaʻe ʻia ka graphite, ʻoi aku ka liʻiliʻi o ka conductivity thermal o ka alumini kalapona brick i ka hilinaʻi ʻana i nā ʻāpana graphite.
(3) No nā pōhaku lepo alumini kalapona haʻahaʻa, i ka wā e hoʻomaʻemaʻe ʻia ai ka graphite, hiki ke hoʻokumu ʻia kahi matrix paʻa paʻa, hiki ke hoʻomaikaʻi i ke kūpaʻa ʻana o nā pōhaku alumini-carbon.
Hōʻike kēia i hiki ke hoʻololi i nā kalapona kalapona alumini haʻahaʻa i nā kūlana hana o nā pahu metala wela nui a me nā kaʻa hui ʻana i ka hao i ka ʻōnaehana hana hao.
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Ka manawa hoʻouna: Feb-27-2024
