Dab tsi yog mullite? Koj yuav nkag siab tom qab nyeem tsab xov xwm
Mullite yog cov khoom siv refractory nrog 3Al2O3.2SiO2 crystalline theem ua lub ntsiab tivthaiv. 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 Al2O371.8% thiab SiO228.2%. Cov pob zeb hauv av yog rhombic siv lead ua, thiab cov muaju yog teem rau hauv kab ntev, koob thiab chains. Koob mullite yog interspersed nyob rau hauv cov khoom los tsim ib lub cev pob txha.
Mullite muab faib ua peb hom: -mullite, sib npaug rau cov ntshiab 3Al2O3·2SiO2, hu ua 3: 2 hom; -mullite, cov tshuaj tov nrog ntau tshaj Al2O3, me ntsis nthuav ua cim, hu ua 2: 1 hom; Gamma-mullite, cov tshuaj tov nrog me me ntawm TiO2 thiab Fe2O3. Mullite ruaj khov hauv petrochemical zog thiab insoluble hauv HF. Nws qhov ceev yog 3.03g / cm3, Mohs hardness 6 ~ 7, melting point 1870 degree, thermal conductivity (1000 degree) yog 13.8W / (m·K), coefficient ntawm linear expansion (20 ~ 1000 degree) yog 5.3 × {{ 30}} degree, elastic modulus 1.47 × 1010Pa. Mullite muaj cov khoom siv zoo thiab cov cua sov ntawm qhov kub thiab txias, yog li cov khoom siv hluav taws xob ntawm qhov kub thiab txias, qis dua cov tshuaj lom neeg, tsis muaj tshuaj yaig thiab zoo thermal shock kuj.
