Refractory raw cov ntaub ntawv Ntxiv nrog rau cov magnesium-aluminium spinel thiab high-alumina zircon hais los saum no, muaj ntau cov ntaub ntawv refractory feem ntau siv hauv refractory cib. Yog li ntawd, txhawm rau kom tau txais cov ntaub ntawv zoo dua, nws yuav tsum muaj kev nkag siab zoo ntawm cov khoom siv raw.
3. Silicon carbide
Silicon carbide yog dav siv nyob rau hauv abrasives, cua sov ntsiab, vim nws siab hardness, hluav taws xob conductivity, kub tsis kam thiab siab zog. Cov khoom lag luam muaj silicon carbide muab faib ua xim dub thiab ntsuab. Dub silicon carbide feem ntau yog siv rau hauv cov khoom siv raw khoom.
Silicon carbide muaj qhov kub thiab txias tsis kam. Nyob rau hauv ib txwm muaj siab, qhov kub tsis sib xws ntawm silicon carbide yog 2760 degree, silicon carbide muaj lub zog siab, thiab lub zog flexural tuaj yeem ncav cuag 625MPa. Silicon carbide muaj cov thermal poob siab zoo, ua tsaug rau nws cov thermal expansion coefficient nruab nrab (4.7 × 10-6K-1) thiab siab thermal conductivity [84W / (m·K)]. Yog li ntawd, silicon carbide yog dav siv los ua ntau yam ceramics thiab refractory raw khoom.
4. Andalusite, kyanite
Ob leeg andalusite thiab kyanite yog cov pab pawg kyanite ntawm cov zaub mov, thiab lawv raug hu ua "peb pob zeb" ua ke nrog sillimanite.
Vim yog qhov loj ntawm kyanite, qhov kub thiab txias shrinkage ntawm refractory raw cov ntaub ntawv tuaj yeem raug them nrog ib qho me me. Vim qhov kub hloov pauv qis ntawm kyanite, nws yog qhov tsim nyog rau refractory uas shrink ntawm qis kub. Yog li ntawd, kyanite yog haum raws li ib tug additive rau nruab nrab thiab qib qis refractoris.
Lub thermal expansion ntawm andalusite yog tsawg, thiab qhov ntau npaum li cas yog txwv. Txawm li cas los xij, cov nyiaj loj dua yuav tsum tau them nyiaj rau tib lub shrinkage. Raws li cov ntsiab lus ntawm andalusite nce, cov creep kuj thiab thermal shock kuj ntawm cov ntaub ntawv refractory yuav zoo heev. Txawm li cas los xij, cov nqi tsim khoom kuj nce ntxiv. Yog li, andalusite yog haum rau nruab nrab thiab qib high-qib refractories.
5. Silica fume
Silica fume yog ib yam khoom uas tau los ntawm cov roj flue ntws los ntawm lub qhov cub rov qab thaum lub sij hawm tsim cov hlau silicon los yog ferrosilicon alloy. SiO2 cov ntsiab lus ntawm silica fume yog 90% ~ 98%, thaj chaw tshwj xeeb yog 15 ~ 30m2 / g, qhov nruab nrab particle loj yog 0.3 ~ 0.5μm, thiab pH{{ 11}}.3–7.6. Imported silica fume muaj ntau dua purity thiab qis pH tus nqi. Hauv tsev silica fume muaj qis purity thiab siab dua pH tus nqi. Ib qho me me ntawm MgO thiab R2O muaj nyob rau hauv silica fume ua rau nws tsis muaj zog alkaline. Feem ntau, refractory castables npaj nrog imported silica fume muaj fluidity zoo, tab sis tus nqi ntawm refractory raw khoom kuj siab.
