Mitundu 7 ya Corundum Refractory Raw Materials yomwe imagwiritsidwa ntchito kwambiri mu Refractory Castables

01 SCorundum yolumikizidwa
Sintered corundum, yomwe imadziwikanso kuti sintered alumina kapena semi-melten alumina, ndi refractory clinker yopangidwa kuchokera ku calcined alumina kapena mafakitale alumina ngati zopangira, yophwanyidwa kukhala mipira kapena matupi obiriwira, ndikuwotchedwa pa kutentha kwakukulu kwa 1750 ~ 1900°C.

Alumina wopangidwa ndi aluminiyamu woposa 99% nthawi zambiri amapangidwa ndi corundum yopyapyala yofanana yolumikizidwa mwachindunji. Kuchuluka kwa mpweya wotuluka kuli pansi pa 3.0%, kuchuluka kwa voliyumu kumafika pa 3.60%/kiyubiki mita, kukana kwake kuli pafupi ndi malo osungunuka a corundum, imakhala ndi kukhazikika kwa voliyumu komanso kukhazikika kwa mankhwala kutentha kwambiri, ndipo siiwonongeka chifukwa chochepetsa mlengalenga, galasi losungunuka ndi chitsulo chosungunuka. , mphamvu yabwino yamakina komanso kukana kuvala kutentha kwabwinobwino komanso kutentha kwakukulu.

02Corundum Yosakanizidwa
Corundum yosakanikirana ndi corundum yopangidwa ndi kusungunula ufa wa alumina woyera mu ng'anjo yamagetsi yotentha kwambiri. Ili ndi mawonekedwe a malo osungunuka kwambiri, mphamvu yamakina apamwamba, kukana kutentha bwino, kukana dzimbiri mwamphamvu komanso kukulitsa pang'ono. Corundum yosakanikirana ndi chinthu chopangira zinthu zapadera zotsutsana ndi kutentha. Makamaka zimaphatikizapo corundum yoyera yosakanikirana, corundum yofiirira yosakanikirana, corundum yoyera yocheperako, ndi zina zotero.

03Corundum Yoyera Yophatikizidwa
Corundum yoyera yosakanikirana imapangidwa ndi ufa wa alumina weniweni ndipo imasungunuka pa kutentha kwambiri. Ndi yoyera. Njira yosungunulira corundum yoyera kwenikweni ndi njira yosungunulira ndi kubwezeretsanso ufa wa alumina wa mafakitale, ndipo palibe njira yochepetsera. Kuchuluka kwa Al2O3 sikochepera 9%, ndipo kuchuluka kwa zodetsedwa ndi kochepa kwambiri. Kulimba kwake ndi kochepa pang'ono kuposa corundum yofiirira ndipo kulimba kwake ndi kochepa pang'ono. Nthawi zambiri amagwiritsidwa ntchito popanga zida zowononga, zoumba zapadera ndi zipangizo zapamwamba zotsutsa.

04Corundum Yosakanizidwa ndi Brown
Corundum yofiirira yosakanikirana imapangidwa kuchokera ku alumina bauxite yokhala ndi aluminiyamu yambiri ngati chinthu chachikulu ndipo imasakanizidwa ndi coke (anthracite), ndipo imasungunuka mu uvuni wamagetsi wotentha kwambiri kutentha kopitilira 2000°C. Corundum yofiirira yosakanikirana imakhala ndi kapangidwe kolimba komanso kuuma kwambiri ndipo nthawi zambiri imagwiritsidwa ntchito mu zinthu zadothi, zinthu zoyeretsera zinthu molunjika komanso zinthu zapamwamba zotsutsa.

05Corundum yoyera pang'ono
Corundum yoyera imapangidwa ndi electromelting special grade kapena first grade bauxite pansi pa reducing air komanso mikhalidwe yolamulidwa. Mukasungunuka, onjezerani reducing agent (carbon), setting agent (iron filings) ndi decarburizing agent (iron scale). Chifukwa chakuti kapangidwe kake ka mankhwala ndi katundu wake ndi pafupi ndi white corundum, imatchedwa sub-white corundum. Kuchuluka kwake kuli pamwamba pa 3.80g/cm3 ndipo porosity yake yooneka ndi yochepera 4%. Ndi chinthu chabwino kwambiri chopangira zinthu zapamwamba zotsutsa komanso zinthu zosatha.

06Chrome corundum
Pogwiritsa ntchito corundum yoyera, 22% ya chromium imawonjezedwa, ndipo imapangidwa posungunula mu ng'anjo yamagetsi. Mtundu wake ndi wofiirira-wofiira. Kulimba kwake kuli kokwera pang'ono kuposa corundum yofiirira, mofanana ndi corundum yoyera, ndipo kuuma kwake kungakhale 2200-2300Kg/mm2. Kulimba kwake kuli kokwera kuposa kwa corundum yoyera komanso kotsika pang'ono kuposa kwa corundum yofiirira.

07Zirconium Corundum
Zirconium corundum ndi mtundu wa corundum yopangidwa ndi kusungunula alumina ndi zirconium oxide pa kutentha kwakukulu mu uvuni wamagetsi, kupangitsa kuti ikhale yolimba, yozizira, yophwanyika komanso yowunikira. Gawo lalikulu la kristalo la zirconium corundum ndi α-Al2O3, gawo lachiwiri la kristalo ndi baddeleyite, ndipo palinso gawo laling'ono la galasi. Kapangidwe ka kristalo ndi kapangidwe ka zirconium corundum ndi zinthu zofunika kwambiri zomwe zimakhudza ubwino wake. Zirconium corundum ili ndi makhalidwe a kuuma kwambiri, kulimba bwino, mphamvu zambiri, kapangidwe kokhuthala, mphamvu yopera yamphamvu, mphamvu yokhazikika ya mankhwala, komanso kukana kutentha kwambiri. Imagwiritsidwa ntchito kwambiri m'mafakitale opangira zinthu zotsutsana ndi zinthu zotsutsana. Malinga ndi kuchuluka kwa zirconium oxide, imatha kugawidwa m'magulu awiri azinthu: ZA25 ndi ZA40.