ʻO nā mea āpau e pono ai ʻoe e ʻike e pili ana i nā pōhaku Mullite: ka hoʻokaʻawale ʻana a me nā noi

Hoʻolauna

I nā ʻoihana wela kiʻekiʻe—mai ka hana kila a hiki i ka hana aniani—ʻo nā mea kūpaʻa ke kumu o nā hana palekana a me ka pono. Ma waena o kēia mau mea,nā pōhaku mullitekū i waho no ko lākou kūpaʻa wela kūikawā, ke kūpaʻa i ka pala, a me ka ikaika mechanical. He mea koʻikoʻi ka hoʻomaopopo ʻana i kā lākou hoʻokaʻawale ʻana a me nā noi no nā ʻoihana e ʻimi nei e hoʻonui i ke ola o nā lako a hoʻemi i nā kumukūʻai hana. Hoʻokaʻawale kēia ʻatikala i nā ʻano koʻikoʻi o nā pōhaku mullite a me kā lākou hoʻohana maoli, e kōkua ana iā ʻoe e hana i nā hoʻoholo naʻauao no kāu mau pono ʻoihana.

Ka Hoʻokaʻawale ʻana o nā Piliki Mullite

Ua hoʻokaʻawale ʻia nā piliki Mullite ma muli o nā kaʻina hana a me nā ʻāpana i hoʻohui ʻia, kēlā me kēia i hana ʻia no nā koi ʻoihana kikoʻī.

1. Nā Piliki Mullite Sintered

Hana ʻia ma ke kāwili ʻana i ka alumina maʻemaʻe kiʻekiʻe a me ka silica, ke hoʻopili ʻana i ka hui ʻana, a me ka sintering ʻana i nā mahana ma luna o 1600°C, ʻo nā piliki mullite sintered e haʻaheo i kahi ʻano paʻa a me ka porosity haʻahaʻa (ma lalo o 15%). Hāʻawi kēia mau ʻano iā lākou i ke kūpaʻa maikaʻi loa i ka ʻaʻahu a me ke kūpaʻa ʻana i ka haʻalulu wela—kūpono no nā wahi me nā loli pinepine o ka mahana. ʻO nā hoʻohana maʻamau e pili ana i nā uhi no nā umu keramika, nā kapuahi puhi wela o ka umu pahū, a me nā keʻena kuni paila.

2. Nā Piliki Mullite i hoʻoheheʻe ʻia

Hana ʻia ma ka hoʻoheheʻe ʻana i nā mea maka (alumina, silica) i loko o kahi umu arc uila (ma luna o 2000°C) a me ka hoʻolei ʻana i ka hui hoʻoheheʻe ʻia i loko o nā ʻōmole, he haʻahaʻa loa nā pae haumia o nā piliki mullite i hoʻoheheʻe ʻia a me ka maʻemaʻe crystalline kiʻekiʻe. ʻO ko lākou kūpaʻa kiʻekiʻe i ka ʻino kemika (e laʻa, mai ke aniani hoʻoheheʻe ʻia a i ʻole nā ​​​​slags) e hoʻolilo iā lākou i koho kiʻekiʻe no nā mea hoʻoulu hou o ka umu aniani, nā ʻauʻau tin aniani lana, a me nā lako ʻē aʻe i hōʻike ʻia i nā media hoʻoheheʻe ikaika.

3. Nā Piliki Mullite Māmā

Hana ʻia ma ka hoʻohui ʻana i nā mea hana pore (e laʻa, sawdust, graphite) i ka wā o ka hana ʻana, he 40-60% ka porosity o nā piliki mullite māmā a he haʻahaʻa loa ka density ma mua o nā ʻano sintered a fused-cast paha. ʻO ko lākou pono nui ka haʻahaʻa o ka thermal conductivity (0.4-1.2 W/(m·K)), kahi e hōʻemi ai i ka nalowale o ka wela. Hoʻohana nui ʻia lākou ma ke ʻano he mau papa insulation i loko o nā kilns, nā umu, a me nā lako hana wela, kahi e hoʻoikaika ai ke kaumaha a me ka pono o ka ikehu.

4. Nā Piliki Mullite Zircon

Ma ka hoʻohui ʻana i ka zircon (ZrSiO₄) i loko o ka hui ʻana o nā mea maka, loaʻa i nā piliki zircon mullite ka hana wela kiʻekiʻe i hoʻonui ʻia—hiki iā lākou ke kū i nā mahana a hiki i 1750°C a pale aku i ka ʻino ʻana mai nā ʻōpala waikawa. ʻO kēia ka mea e kūpono ai lākou no nā wahi ʻino e like me nā umu hoʻoheheʻe metala ʻole-ferrous (e laʻa, nā cell hoʻemi alumini) a me nā wahi puhi sima rotary kiln.