Dab tsi yog mullite?

Puas yog mullite tsim hauv 3Al? O? · 2 TSI? Cov theem crystalline yog qhov tseem ceeb ntawm cov khoom siv refractory. Mullite muab faib ua natural mullite thiab hluavtaws mullite. Ntuj mullite tsis tshua muaj thiab feem ntau yog hluavtaws.
Cov tshuaj muaj pes tsawg leeg ntawm mullite yog Al? O? 71.8%, SiO 28.2%. Cov qauv ntxhia yog rhombic siv lead ua, thiab cov muaju yog teem rau hauv kab ntev, koob, thiab chains. Needle mullite intersperses nrog ib leeg nyob rau hauv cov khoom los tsim ib lub cev pob txha. Muaj peb hom mullite: -mullite, uas yog sib npaug rau 3Al ntshiab? O? · 2 TSI? Hom 3:2 luv luv; -mullite, cov tshuaj tov nrog ntau tshaj txhuas oxide, lattice nthuav me ntsis, hu ua 2: 1 hom; Gamma-mullite, cov tshuaj tov nrog me me ntawm titanium oxide thiab hlau trioxide. Mullite yog tshuaj ruaj khov thiab insoluble hauv hydrofluoric acid. Nws qhov ceev yog 3.03g / cm3, Mohs hardness 6-7, melting point 1870 degree, thermal conductivity (1000 degree) yog 13.8W / (mK), linear expansion coefficient ({21}} degree) yog 5.3 * 10 ?? / degree, elastic modulus 1.47 * 10?? Pa.
Vim tias mullite muaj cov tshuab kub siab thiab cov khoom siv hluav taws xob kub siab, cov tshuaj muaj zog ntawm cov tshuaj lom neeg, cov tshuaj muaj zog tsis kam, thermal poob siab tsis kam thiab lwm yam.
Cov ntsiab lus tseem ceeb los ntsuas qib zoo ntawm mullite yog theem muaj pes tsawg leeg thiab qhov ceev ntawm mullite.