7 ʻAno o nā mea maka refractory corundum i hoʻohana pinepine ʻia i nā mea hoʻoheheʻe refractory

01 SCorundum i hoʻopili ʻia
ʻO ka corundum sintered, i ʻike ʻia hoʻi ʻo alumina sintered a i ʻole alumina semi-melten, he clinker refractory i hana ʻia mai ka alumina calcined a i ʻole ka alumina ʻoihana e like me ka mea maka, wili ʻia i loko o nā pōpō a i ʻole nā ​​​​kino ʻōmaʻomaʻo, a sintered ma kahi mahana kiʻekiʻe o 1750 ~ 1900 ° C.

ʻO ka alumina sintered e loaʻa ana ma mua o 99% o ka alumini oxide i hana ʻia me ka corundum fine-grained like i hui pololei ʻia. ʻOi aku ka nui o ka hoʻokuʻu ʻana o ke kinoea ma lalo o 3.0%, hiki i ka nui o ka nui i ka 3.60% / mika cubic, kokoke ka refractoriness i ka wahi heheʻe o ka corundum, he paʻa maikaʻi ka nui a me ke kūpaʻa kemika i nā mahana kiʻekiʻe, a ʻaʻole ia e hoʻopau ʻia e ka lewa hōʻemi, ke aniani hoʻoheheʻe a me ka metala hoʻoheheʻe. , ikaika mechanical maikaʻi a me ke kūpaʻa ʻaʻahu i ka mahana maʻamau a me ke kiʻekiʻe.

02Corundum i hoʻohui ʻia
ʻO ka corundum i hoʻoheheʻe ʻia he corundum hana i hana ʻia ma ka hoʻoheheʻe ʻana i ka pauka alumina maʻemaʻe i loko o ka umu uila wela kiʻekiʻe. Loaʻa iā ia nā ʻano o ke kiko heheʻe kiʻekiʻe, ka ikaika mechanical kiʻekiʻe, ke kūpaʻa haʻalulu wela maikaʻi, ke kūpaʻa corrosion ikaika a me ka coefficient hoʻonui linear liʻiliʻi. ʻO ka corundum i hoʻoheheʻe ʻia kahi mea maka no ka hana ʻana i nā mea refractory kūikawā kiʻekiʻe. ʻO ka hapa nui e komo pū me ka corundum keʻokeʻo i hoʻoheheʻe ʻia, ka corundum ʻeleʻele i hoʻoheheʻe ʻia, ka corundum keʻokeʻo liʻiliʻi, a pēlā aku.

03Corundum Keʻokeʻo i hoʻohui ʻia
Hana ʻia ka corundum keʻokeʻo i hoʻohui ʻia mai ka pauka alumina maʻemaʻe a hoʻoheheʻe ʻia i ka mahana kiʻekiʻe. He keʻokeʻo kona kala. ʻO ke kaʻina hana hoʻoheheʻe o ka corundum keʻokeʻo he hana ia o ka hoʻoheheʻe ʻana a me ka recrystallization o ka pauka alumina ʻoihana, a ʻaʻohe hana hoʻemi. ʻAʻole emi ka nui o Al2O3 ma mua o 9%, a he liʻiliʻi loa ka nui o ka haumia. ʻOi aku ka liʻiliʻi o ka paʻakikī ma mua o ka corundum ʻeleʻele a ʻoi aku ka haʻahaʻa o ka paʻakikī. Hoʻohana pinepine ʻia e hana i nā mea hana abrasive, nā keramika kūikawā a me nā mea refractory holomua.

04Corundum ʻEleʻele i hoʻohui ʻia
Hana ʻia ka corundum ʻeleʻele i hoʻohui ʻia mai ka bauxite alumina kiʻekiʻe ma ke ʻano he mea maka nui a kāwili ʻia me ka coke (anthracite), a hoʻoheheʻe ʻia i loko o ka umu uila wela kiʻekiʻe ma nā mahana ma luna o 2000°C. He ʻano mānoanoa ko ka corundum ʻeleʻele i hoʻohui ʻia a he paʻakikī kiʻekiʻe a hoʻohana pinepine ʻia i loko o nā keramika, nā hoʻoheheʻe pololei a me nā mea refractory holomua.

05Corundum keʻokeʻo liʻiliʻi
Hoʻopuka ʻia ka corundum subwhite ma o ka electromelting special grade a i ʻole ka bauxite papa mua ma lalo o ka lewa hoʻemi a me nā kūlana i kāohi ʻia. I ka wā e hoʻoheheʻe ai, e hoʻohui i ka mea hoʻemi (kalapona), ka mea hoʻonohonoho (nā waihona hao) a me ka mea decarburizing (unahi hao). Ma muli o kona ʻano kemika a me nā waiwai kino e kokoke ana i ka corundum keʻokeʻo, ua kapa ʻia ʻo ia he corundum sub-keʻokeʻo. ʻOi aku kona nui ma mua o 3.80g/cm3 a ʻoi aku ka liʻiliʻi o kona porosity ma mua o 4%. He mea kūpono ia no ka hana ʻana i nā mea refractory holomua a me nā mea pale i ka ʻaʻahu.

06Korundum Chrome
Ma ke kumu o ke corundum keʻokeʻo, ua hoʻohui ʻia he 22% chromium, a hana ʻia ia ma ke hoʻoheheʻe ʻia ʻana i loko o ka umu arc uila. He poni-ʻulaʻula ke kala. ʻOi aku ka paʻakikī ma mua o ke corundum ʻeleʻele, e like me ke corundum keʻokeʻo, a hiki i ka microhardness ke 2200-2300Kg/mm2. ʻOi aku ka paʻakikī ma mua o ke corundum keʻokeʻo a haʻahaʻa iki ma mua o ke corundum ʻeleʻele.

07Zirconium Corundum
ʻO ka Zirconium corundum kahi ʻano corundum hana i hana ʻia ma ka hoʻoheheʻe ʻana i ka alumina a me ka zirconium oxide ma ka mahana kiʻekiʻe i loko o ka umu arc uila, crystallizing, hoʻomaʻalili, kuʻi a me ka nānā ʻana. ʻO ke ʻano kristal nui o ka zirconium corundum ʻo α-Al2O3, ʻo ke ʻano kristal lua ʻo baddeleyite, a he liʻiliʻi hoʻi o ke aniani. ʻO ke ʻano kristal a me ke ʻano o ka zirconium corundum nā mea nui e hoʻopilikia ana i kona ʻano. Loaʻa i ka Zirconium corundum nā ʻano o ka paʻakikī kiʻekiʻe, ka paʻakikī maikaʻi, ka ikaika kiʻekiʻe, ke ʻano mānoanoa, ka ikaika wili ikaika, nā waiwai kemika paʻa, a me ke kūpaʻa haʻalulu wela maikaʻi. Hoʻohana nui ʻia ia i nā ʻoihana abrasives a me nā mea refractory. Wahi a kona ʻike zirconium oxide, hiki ke hoʻokaʻawale ʻia i ʻelua pae huahana: ZA25 a me ZA40.