Daim Ntawv Thov ntawm Fused Corundum Cib hauv Float Glass Melting Rauv

Cov cib corundum sib xyaw ua keyog cov alumina yaj hauv lub cub hluav taws xob arc thiab pov rau hauv tus qauv tshwj xeeb ntawm ib daim duab tshwj xeeb, annealed thiab khaws cia cua sov, thiab tom qab ntawd ua tiav kom tau txais cov khoom xav tau. Cov txheej txheem tsim khoom dav dav yog siv cov alumina calcined purity (saum toj no 95%) thiab me ntsis ntawm cov khoom ntxiv, muab cov khoom xyaw rau hauv lub cub hluav taws xob arc, thiab pov rau hauv cov pwm prefabricated tom qab yaj ntawm qhov kub siab tshaj 2300 ° C, thiab tom qab ntawd ua kom lawv sov Tom qab annealing, nws raug coj tawm, thiab cov khoom seem coj tawm los ua cov khoom tiav uas ua tau raws li qhov yuav tsum tau ua tom qab ua haujlwm txias, ua ntej sib dhos thiab tshuaj xyuas.

Cov cib fim corundum sib xyaw ua ke tau muab faib ua peb hom raws li cov qauv siv lead ua sib txawv thiab qhov ntau ntawm alumina: thawj zaug yog α-Al2O3 ua theem siv lead ua tseem ceeb, hu ua α-corundum cib; qhov thib ob yog α-Al2 Cov theem siv lead ua O3 thiab β-Al2O3 feem ntau yog cov ntsiab lus tib yam, uas hu ua αβ corundum cib; hom thib peb feem ntau yog β-Al2O3 theem siv lead ua, hu ua β corundum cib. Cov cib fim corundum sib xyaw feem ntau siv hauv cov cub tawg iav ntab yog hom thib ob thiab thib peb, uas yog cov cib fim corundum sib xyaw thiab β corundum cib. Tsab xov xwm no yuav tsom mus rau cov khoom siv lub cev thiab tshuaj ntawm cov cib fim corundum sib xyaw thiab β corundum cib thiab lawv daim ntawv thov hauv cov cub tawg iav ntab.

1. Kev tshuaj xyuas kev ua tau zoo ntawm cov cib corundum fused

1. 1 Fused αβ corundum cib

Cov cib fim αβ corundum uas tau sib xyaw ua ke muaj li ntawm 50% α-Al2O3 thiab β-Al2O3, thiab ob lub siv lead ua ke tau sib txuas ua ke los ua ib lub qauv ntom ntom, uas muaj zog tiv taus alkali corrosion zoo heev. Qhov tiv taus corrosion ntawm qhov kub siab (saum toj no 1350 ° C) yog qhov phem dua li ntawm cov cib fim AZS uas tau sib xyaw ua ke, tab sis ntawm qhov kub qis dua 1350 ° C, nws qhov tiv taus corrosion rau cov iav molten yog sib npaug rau cov cib fim AZS uas tau sib xyaw ua ke. Vim tias nws tsis muaj Fe2O3, TiO2 thiab lwm yam tsis huv, theem iav matrix yog me me heev, thiab cov khoom txawv teb chaws xws li npuas yuav tsis tshua muaj thaum nws sib cuag nrog cov iav molten, yog li ntawd cov iav matrix yuav tsis muaj kuab paug.

Cov cib fim αβ corundum uas tau sib xyaw ua ke yog cov khoom siv crystallization uas tuab thiab muaj kev tiv thaiv corrosion zoo heev rau cov iav uas tau yaj hauv qab 1350 ° C, yog li lawv tau siv dav hauv pas dej ua haujlwm thiab dhau ntawm cov cub tawg iav, feem ntau yog hauv cov tshuab ntxhua khaub ncaws, cov cib di ncauj, cov cib rooj vag, thiab lwm yam. Cov cib fim corundum uas tau sib xyaw ua ke hauv ntiaj teb yog cov khoom zoo tshaj plaws los ntawm Toshiba ntawm Nyiv.

1.2 Fused β corundum cib

Cov cib β-corundum uas tau sib xyaw ua ke yog tsim los ntawm yuav luag 100% β-Al2O3, thiab muaj cov qauv crystalline β-Al2O3 zoo li lub phaj loj. Loj dua thiab tsis muaj zog. Tab sis ntawm qhov tod tes, nws muaj kev tiv thaiv zoo spalling, tshwj xeeb tshaj yog nws qhia txog kev tiv thaiv corrosion siab heev rau cov pa alkali muaj zog, yog li nws yog siv rau hauv cov qauv sab saud ntawm lub cub tawg iav. Txawm li cas los xij, thaum nws raug cua sov hauv huab cua nrog cov ntsiab lus alkali tsawg, nws yuav cuam tshuam nrog SiO2, thiab β-Al2O3 yuav yooj yim decompose thiab ua rau ntim shrinkage ua rau tawg thiab tawg, yog li nws yog siv rau hauv qhov chaw deb ntawm qhov tawg ntawm cov khoom siv iav raw.

1.3 Cov khoom siv lub cev thiab tshuaj lom neeg ntawm cov cib fim fused αβ thiab β corundum

Cov tshuaj lom neeg sib xyaw ntawm cov cib α-β thiab β corundum fused feem ntau yog Al2O3, qhov sib txawv feem ntau yog nyob rau hauv cov khoom siv lead ua ke, thiab qhov sib txawv hauv microstructure ua rau muaj qhov sib txawv ntawm cov khoom siv lub cev thiab tshuaj xws li qhov ceev ntawm cov khoom loj, cov coefficient ntawm kev nthuav dav thermal, thiab lub zog compressive.

2. Daim ntawv thov ntawm cov cib corundum fused hauv cov cub tawg iav

Ob qho tib si hauv qab thiab phab ntsa ntawm lub pas dej ua ke sib cuag ncaj qha nrog cov kua iav. Rau txhua qhov chaw sib cuag ncaj qha nrog cov kua iav, qhov tseem ceeb tshaj plaws ntawm cov khoom siv refractory yog qhov tsis kam xeb, uas yog, tsis muaj kev cuam tshuam tshuaj lom neeg tshwm sim ntawm cov khoom siv refractory thiab cov kua iav.

Nyob rau hauv xyoo tas los no, thaum soj ntsuam cov ntsuas zoo ntawm cov khoom siv fused refractory hauv kev sib cuag ncaj qha nrog cov iav molten, ntxiv rau cov tshuaj lom neeg muaj pes tsawg leeg, cov ntsuas lub cev thiab tshuaj lom neeg, thiab cov khoom siv hauv cov pob zeb, peb cov ntsuas hauv qab no yuav tsum tau soj ntsuam: iav tiv thaiv kev yaig, cov ntsuas npuas precipitated thiab cov ntsuas crystallization precipitated.

Nrog rau qhov yuav tsum tau ua kom zoo dua rau cov iav thiab qhov muaj peev xwm tsim khoom ntau dua ntawm lub cub tawg, kev siv cov cib hluav taws xob fused yuav dav dua. Cov cib fused feem ntau siv hauv cov cub tawg iav yog AZS series (Al2O3-ZrO2-SiO2) fused cib. Thaum qhov kub ntawm AZS cib yog siab dua 1350 ℃, nws qhov kev tiv thaiv corrosion yog 2 ~ 5 zaug ntawm αβ-Al2O3 cib. Fused αβ corundum cib yog tsim los ntawm α-alumina (53%) thiab β-alumina (45%) cov khoom me me, muaj cov iav theem me me (kwv yees li 2%), sau cov qhov hws ntawm cov siv lead ua, nrog kev ntshiab siab, thiab tuaj yeem siv ua qhov txias ntawm pas dej ua ke phab ntsa cib thiab qhov txias ntawm txoj kev hauv qab Cib thiab cov cib seam thiab lwm yam.

Cov khoom siv hauv cov pob zeb ntawm cov cib αβ corundum fused tsuas muaj me me ntawm cov iav theem, uas yuav tsis ntws tawm thiab ua rau cov kua iav qias neeg thaum siv, thiab muaj kev tiv thaiv corrosion zoo thiab zoo heev kub hnav tsis kam hauv qab 1350 ° C. Nws yog qhov txias ntawm lub cub tawg iav. Nws yog cov khoom siv refractory zoo tagnrho rau phab ntsa tank, hauv qab tank thiab cov ntxhua khaub ncaws ntawm cov cub tawg iav melting. Hauv qhov project engineering float iav melting cub tawg, cov cib αβ corundum fused siv ua lub pas dej phab ntsa cib ntawm qhov txias ntawm lub cub tawg iav melting. Tsis tas li ntawd, cov cib αβ corundum fused kuj tseem siv rau cov cib pavement thiab npog cov cib sib koom ua ke hauv qhov txias.

Fused β corundum cib yog cov khoom dawb uas muaj β-Al2O3 coarse crystals, muaj 92% ~ 95% Al2O3, tsuas yog tsawg dua 1% iav theem, thiab nws lub zog ntawm cov qauv tsis muaj zog vim yog lub lattice siv lead ua xoob. Qis, qhov pom tseeb porosity tsawg dua 15%. Txij li thaum Al2O3 nws tus kheej tau saturated nrog sodium saum toj no 2000 ° C, nws ruaj khov heev tiv thaiv alkali vapor ntawm qhov kub siab, thiab nws qhov thermal stability kuj zoo heev. Txawm li cas los xij, thaum sib cuag nrog SiO2, Na2O uas muaj nyob hauv β-Al2O3 decomposes thiab reacts nrog SiO2, thiab β-Al2O3 yooj yim hloov mus rau hauv α-Al2O3, ua rau muaj qhov ntim loj shrinkage, ua rau tawg thiab puas tsuaj. Yog li ntawd, nws tsuas yog tsim rau cov qauv sab saud uas nyob deb ntawm SiO2 cov hmoov av ya, xws li cov qauv sab saud ntawm lub pas dej ua haujlwm ntawm lub cub tawg iav, lub qhov dej nyob tom qab ntawm thaj chaw yaj thiab nws cov parapet nyob ze, lub cub tawg me me thiab lwm qhov.

Vim tias nws tsis cuam tshuam nrog cov alkali hlau oxides uas tsis ruaj khov, yuav tsis muaj cov khoom yaj tawm ntawm qhov chaw cib los ua rau lub iav puas tsuaj. Hauv lub cub tawg iav ntab, vim yog qhov nqaim ntawm qhov nkag ntawm cov channel ntws ntawm qhov txias, nws yooj yim ua rau cov pa alkaline condensation ntawm no, yog li cov channel ntws ntawm no yog ua los ntawm fused β cib uas tiv taus xeb los ntawm alkaline pa.

3. Xaus Lus

Raws li cov khoom zoo heev ntawm cov cib corundum fused hais txog kev tiv thaiv kev yaig iav, ua npuas dej tsis kam, thiab pob zeb tsis kam, tshwj xeeb tshaj yog nws cov qauv siv lead ua tshwj xeeb, nws tsis tshua ua rau cov iav molten qias neeg. Muaj cov ntawv thov tseem ceeb hauv kev siv txoj siv tawv, qhov chaw txias, tus khiav, lub cub tawg me me thiab lwm qhov.