Dab tsi yog cov khoom xyaw ntawm mullite cib?

Cov khoom xyaw tuaj yeem txiav txim siab raws li Al2O3 cov ntsiab lus txiav txim siab los ntawm kev siv. Tam sim no, cov txheej txheem sib xyaw ua ke yog:

①Synthetic mullite (sintered lossis fused) yog aggregate + hluavtaws mullite hmoov zoo;

②Synthetic mullite (sintered los yog fused) yog aggregate + hluavtaws mullite hmoov zoo + Al2O3 hmoov zoo + hmoov av purity siab;

③Synthetic mullite (sintered los yog fused) thiab fused dawb corundum yog aggregate + hluavtaws mullite hmoov zoo + Al2O3 hmoov zoo + high-purity av nplaum hmoov. Qhov loj me me piv yuav tsum tau npaj raws li cov ntsiab lus ntawm “loj ntawm ob qho tag nrho thiab me me hauv nruab nrab”. Siv sulfite pulp pov tseg kua los yog polyaluminium chloride los yog polyphosphate ua tus neeg sawv cev. Tom qab sib tov sib xyaw, nws yog tsim nyob rau hauv siab siab thiab raug rho tawm haujlwm nyob rau hauv ib tug kub kub kiln. Qhov hluav taws kub kub yog txiav txim los ntawm cov ntsiab lus ntawm Al2O3 nyob rau hauv lub refractory cib. Ntawm 1600 ~ 1700 ℃.

Zirconium mullite cib yog fused cam khwb cia refractory khoom ua los ntawm mullite thiab zirconia. Zirconium mullite fusts cam khwb cia siv lead ua qauv, muaj zog ua kom sov nyob rau hauv chav tsev kub thiab siab thermal conductivity, thiab ua tau zoo heev rau kev yaig.

Fe2O3 muaj qee yam khoom solubility hauv mullite thiab corundum ntawm qhov kub thiab txias, tsim cov tshuaj finite. Nws cov khoom solubility hauv corundum yog siab dua li hauv mullite, thiab siv lead ua lattice ntawm mullite thiab corundum loj hlob vim yog kev tsim cov kuab tshuaj. Thawj melting kub ntawm Fe2O3 rau Al2O3-SiO2 cov ntaub ntawv muaj feem xyuam rau Al2O3 cov ntsiab lus nyob rau hauv lub system los yog qhov ratio ntawm Al2O3 / SiO2. Thaum Al2O3 / SiO2 <2.55, qhov pib melting kub yog 1380 ℃. Yog tias Al2O3 / SiO2> 2.55, qhov pib melting kub yog 1380 ℃. Lub melting kub yog nce mus rau 1460 ℃, thiab maj mam nce nrog qhov nce ntawm nws cov ntsiab lus Al2O3. Nyob rau hauv ib qho kev txo qis, Fe2O3 raug txo rau FeO thiab desolubilizes rau hauv lub khob theem, thiab qhov pib melting kub ntawm lub cev poob mus rau 1240 ° C thiab 1380 ° C, raws li.

Nrog rau qhov nce ntawm Al2O3 cov ntsiab lus hauv mullite cib, nws qhov kub thiab txias kev ua tau zoo tuaj; thaum tus nqi ntawm cov kuab tshuaj nce, qhov kub thiab txias kev ua tau zoo txo. Raws li, nruj me ntsis tswj cov ntsiab lus ntawm impurity oxides, tshwj xeeb tshaj yog cov ntsiab lus ntawm K2O, Na2O thiab Fe2O3, yog ib qho tseem ceeb ntsuas kom tau txais high-kev ua tau zoo thiab high-purity mullite cib. Siv nyob rau hauv slag los yog roj ib puag ncig uas muaj alkali Cheebtsam, nws muaj ib tug loj corrosive nyhuv ntawm mullite refractory bricks.