Kaolin, kaolin i hoʻokahe ʻia, kaolin i holoi ʻia, metakaolin.

ʻO nā hoʻohana o kaolin:
Ma ke ʻano he mea maka mineral e pono ai no nā ʻoihana he nui, e like me ka hana pepa, nā keramika, ka laholio, ka ʻoihana kemika, ka uhi ʻana, ka lāʻau lapaʻau a me ka pale kaua aupuni, loaʻa iā kaolin kekahi plasticity, ka mea e hana ai i ke kino lepo keramika i mea e kūpono ai i ka huli ʻana, ka grouting a me ke kūkulu ʻana.

ʻO ke kuleana o ke kaolin i loko o nā keramika, ʻo ia ka hoʻolauna ʻana iā Al2O3, kahi mea e kūpono ai i ka hoʻokumu ʻia ʻana o ka mullite a hoʻomaikaʻi i kona kūpaʻa kemika a me ka ikaika sintering.

I ka wā o ka sintering, hoʻoheheʻe ʻia ke kaolin i loko o ka mullite, e hana ana i ke ʻano nui o ka ikaika o ke kino ʻōmaʻomaʻo, hiki ke pale i ka deformation o nā huahana, hoʻonui i ka mahana ahi, a hana i ke kino ʻōmaʻomaʻo i kahi keʻokeʻo.

ʻO Metakaolin (MK no ka pōkole) he silicate alumini anhydrous (Al2O3 · 2SiO2, AS2 no ka pōkole) i hoʻokumu ʻia e ka dehydration o kaolin (Al2O3 · 2SiO2 · 2H2O, AS2H2 no ka pōkole) ma kahi mahana kūpono (600 ~ 900 ℃). No Kaolin kahi ʻano silicate papa, a ua hoʻopaʻa ʻia nā papa e ka pilina van der Waals, kahi i hoʻopaʻa paʻa ʻia ai nā ion OH. Ke hoʻomehana ʻia ka kaolin i ka lewa, e loli pinepine kona ʻano. Ke hoʻomehana ʻia a hiki i kahi 600 ℃, e luku ʻia ke ʻano papa o kaolin ma muli o ka dehydration, e hana ana i kahi metakaolin pae hoʻololi me ka crystallinity maikaʻi ʻole. No ka mea he ʻano like ʻole ka hoʻonohonoho molekala o metakaolin, hōʻike ia i kahi kūlana metastable thermodynamic a loaʻa iā ia ka gellability ma lalo o ka hoʻonāukiuki kūpono.

He ʻano hui mineral hana nui ʻo Metakaolin. He silicate alumini amorphous ia i hana ʻia e kaolin ultra-fine i calcined ʻia ma ka mahana haʻahaʻa. Loaʻa iā ia ka hana pozzolanic kiʻekiʻe, hoʻohana nui ʻia e like me ka hui sima, a hiki ke hoʻohana ʻia e hana i nā polymers geological hana kiʻekiʻe.