Zosakaniza zake ndi ziti njerwa mullite?

Zosakaniza zitha kutsimikiziridwa molingana ndi zomwe zili mu Al2O3 zomwe zimatsimikiziridwa ndi momwe amagwiritsidwira ntchito. Masiku ano, njira zomwe zimagwiritsidwa ntchito kwambiri ndizo:

①Synthetic mullite (sintered kapena wosakaniza) ndi aggregate + kupanga mullite ufa wabwino;

②Synthetic mullite (sintered kapena fused) ndi aggregate + synthetic mullite ufa wabwino + Al2O3 ufa wabwino + ufa wadongo wapamwamba;

③Synthetic mullite (sintered kapena fused) ndi corundum yoyera yosakanikirana ndi yophatikizika + yopangidwa ndi mullite ufa wabwino + Al2O3 ufa wabwino + ufa wadongo wapamwamba kwambiri. The tinthu kukula chiŵerengero ayenera kukonzekera molingana ndi pophika mfundo ya “zazikulu pa malekezero onse ndi zazing’ono pakati”. Gwiritsani ntchito madzi otayira a sulfite zamkati kapena polyaluminium chloride kapena polyphosphate ngati chomangira. Pambuyo posakanikirana mofanana, amapangidwa pansi pa kupanikizika kwakukulu ndikuwotchedwa mu ng’anjo yotentha kwambiri. Kuwotcha kutentha anatsimikiza ndi zili Al2O3 mu refractory njerwa. Pakati pa 1600 ~ 1700 ℃.

Njerwa za Zirconium mullite ndizopangidwa ndi zinthu zosakanizidwa zopangidwa ndi mullite ndi zirconia. Njerwa ya Zirconium mullite yosakanikirana imakhala ndi mawonekedwe a kristalo wandiweyani, kutentha kwakukulu kofewetsa pansi pa katundu, kukhazikika kwamafuta, mphamvu zamakina kwambiri kutentha kutentha komanso kutentha kwambiri, kukana kuvala bwino, kukhathamiritsa kwamafuta abwino, komanso kukana kukokoloka.

Fe2O3 imakhala ndi kusungunuka kolimba mu mullite ndi corundum pa kutentha kwakukulu, kupanga njira yokhazikika yokhazikika. Kusungunuka kwake kolimba mu corundum ndikwapamwamba kuposa mullite, ndipo crystal lattice ya mullite ndi corundum imakula chifukwa cha kupanga njira yolimba. Kutentha koyambirira kosungunuka kwa Fe2O3 kwa zipangizo za Al2O3-SiO2 kumagwirizana ndi zomwe zili mu Al2O3 mu dongosolo kapena chiŵerengero cha Al2O3 / SiO2. Pamene Al2O3/SiO2<2.55, kutentha koyamba kusungunuka ndi 1380 ℃. Ngati Al2O3/SiO2>2.55, kutentha koyamba kusungunuka ndi 1380 ℃. Kutentha kosungunuka kumawonjezeka kufika ku 1460 ℃, ndipo pang’onopang’ono kumawonjezeka ndi kuwonjezeka kwa zomwe zili mu Al2O3. Mu mpweya wochepetsera, Fe2O3 imachepetsedwa kukhala FeO ndipo imasungunuka mu gawo la galasi, ndipo kutentha kwa incipient kusungunuka kwa dongosolo kumatsika mpaka 1240 ° C ndi 1380 ° C, motero.

Ndi kuwonjezeka kwa zinthu za Al2O3 mu njerwa za mullite, kutentha kwake kwakukulu kumapita bwino; pamene kuchuluka kwa zosungunulira kumawonjezeka, kutentha kwakukulu kumachepa. Choncho, mosamalitsa kulamulira zili zonyansa oxides, makamaka zili K2O, Na2O ndi Fe2O3, ndi yofunika muyeso kupeza mkulu-ntchito ndi mkulu-chiyero mullite njerwa. Imagwiritsidwa ntchito m’malo a slag kapena gasi okhala ndi zida za alkali, imakhala ndi mphamvu yowononga kwambiri njerwa za mullite refractory.