Njerwa za Mullite

Njerwa za Mullite ndizitsulo zapamwamba za aluminiyamu zomwe zimakhala ndi mullite monga gawo lalikulu la kristalo.Nthawi zambiri, zomwe zili mu alumina zimakhala pakati pa 65% ndi 75%.Kuphatikiza pa mullite, mchere wokhala ndi aluminiyamu wocheperako ulinso ndi gawo laling'ono la vitreous ndi cristobalite.Zomwe zili pamwamba pa alumina zimakhalanso ndi zochepa za corundum.

Njerwa za Mullite zimakhala ndi kukana kwakukulu, komwe kumatha kufika pamwamba pa 1790 ° C.Katundu wofewetsa kutentha koyambira ndi 1600 ~ 1700 ℃.Mphamvu yopondereza kutentha ndi 70-260MPa.Kukana kwabwino kwa kutentha kwa kutentha.

Pali mitundu iwiri ya njerwa za sintered mullite ndi njerwa zosakanikirana za mullite.

Njerwa za sintered mullite zimapangidwa ndi aluminiyamu yapamwamba kwambiri ya bauxite clinker monga zopangira zazikulu, kuwonjezera pang'ono dongo kapena bauxite yaiwisi monga chomangira, ndipo amapangidwa ndi kuthamangitsidwa.Njerwa zophatikizika za mullite zimapangidwa ndi bauxite yayikulu, aluminiyamu yamafakitale ndi dongo lotayirira, ndipo tinthu tating'ono ta makala kapena coke timawonjezedwa ngati chochepetsera.Pambuyo pakuumba, amapangidwa ndi kuchepetsa electrofusion.

Kusungunuka kwa mullite wosakanikirana ndikwambiri kuposa kwa sintered mullite, ndipo kukana kwake kutenthedwa kwa kutentha kumakhala bwino kuposa kwazinthu zotayidwa.Kutentha kwawo kwakukulu kumadalira zomwe zili ndi aluminiyamu komanso kufanana kwa magawo a mullite ndi galasi.

Njerwa za Mullite zimagwiritsidwa ntchito kwambiri popangira chitofu chowotcha, kuphulika kwa ng'anjo ndi pansi, chowongolera ng'anjo yamagalasi, ng'anjo ya ceramic, zomangira zakufa pamakona amafuta amafuta, ndi zina zambiri.