Taw Qhia Rau Mullite

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 cov 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 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 qauv ntxhia 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 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.

Kev tsim cov ntaub ntawv mullite feem ntau tuaj yeem ua los ntawm kaolinite, sillimanite pab pawg cov zaub mov, aluminium hydroxide lossis aluminium oxide thiab silicon dioxide ncaj qha ua ke. Cov khoom siv av nplaum reacts nrog alumina los yog sillimanite pab pawg minerals thiab muaj alumina nyob rau hauv lub cua sov mob F los tsim thawj thiab theem nrab mullite, thiab thawj mullite yog tsim nyob rau hauv qhov ntau ntawm 1000 ~ 1200 degree, thiab crystallization yog nce los ntawm ntxiv qhov kub thiab txias. Kev tsim ntawm theem nrab mullite feem ntau xaus ntawm 1650 degree . Txhawm rau tsim cov khoom lag luam ntom ntom, cov txheej txheem ob-kauj ruam sintering feem ntau yog siv. Mullite tuaj nyob rau hauv ob daim ntawv crystalline: acicular thiab prismatic. Acicular mullite ntxiv dag zog rau cov iav theem thiab cov khoom siv tshuaj lom neeg muaj pes tsawg leeg, thiab refractoriness ntawm acicular mullite yog siab dua li ntawm prismatic mullite. Kaolinite yog rhuab mus rau ntau tshaj 1400 degree C los tsim acicular mullite. Txwv tsis pub, qeeb cua sov mus rau qhov kub qis dua ua prismatic mullite. Tseem muaj cov lus ceeb toom ntawm tubular thiab spherical mullite, qhov qub yog suav tias yog vim yog cov silica thiab alumina tetrahedral loj tsis sib haum ua rau qhov nro tshwm sim los ntawm tubular puab, tom kawg yog hu ua nitrogenous mullite. Cov yam ntxwv ntawm mullite thermal expansion anisotropy ua rau nws muaj thermal stability zoo. Thaum cov khoom siv mullite siab heev yog siv los ua cov khoom noj khoom haus, nws tuaj yeem hloov ncaj qha mus rau lub feeder khiav yam tsis muaj preheating.

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