7 Hom Corundum Refractory Raw Materials Feem Ntau Siv Hauv Refractory Castables

01 SCorundum sib xyaw
Sintered corundum, tseem hu ua sintered alumina lossis semi-molten alumina, yog ib qho refractory clinker ua los ntawm calcined alumina lossis industrial alumina ua raw khoom, zom rau hauv pob lossis lub cev ntsuab, thiab sintered ntawm qhov kub siab ntawm 1750 ~ 1900 ° C.

Alumina sintered uas muaj ntau tshaj 99% ntawm txhuas oxide feem ntau yog ua los ntawm cov corundum zoo sib xws uas sib xyaw ua ke ncaj qha. Tus nqi tso pa tawm qis dua 3.0%, qhov ntim ntim ncav cuag 3.60% / cubic meter, qhov refractoriness nyob ze rau qhov chaw yaj ntawm corundum, nws muaj kev ruaj khov zoo thiab tshuaj lom neeg ruaj khov ntawm qhov kub siab, thiab tsis raug eroded los ntawm kev txo cov huab cua, iav molten thiab hlau molten. , lub zog kho tshuab zoo thiab hnav tsis kam ntawm qhov kub ib txwm thiab kub siab.

02Fused Corundum
Fused corundum yog cov corundum cuav uas ua los ntawm kev yaj cov hmoov alumina ntshiab hauv lub cub hluav taws xob kub siab. Nws muaj cov yam ntxwv ntawm qhov chaw yaj siab, lub zog kho tshuab siab, tiv taus thermal poob siab zoo, tiv taus corrosion muaj zog thiab cov coefficient nthuav dav me me. Fused corundum yog cov khoom siv raw rau kev tsim cov khoom siv refractory tshwj xeeb. Feem ntau suav nrog fused white corundum, fused brown corundum, sub-white corundum, thiab lwm yam.

03Fused Dawb Corundum
Fused white corundum yog ua los ntawm cov hmoov alumina ntshiab thiab smelted ntawm qhov kub siab. Nws yog xim dawb. Cov txheej txheem smelting ntawm cov corundum dawb yog qhov tseem ceeb ntawm kev yaj thiab recrystallization ntawm cov hmoov alumina kev lag luam, thiab tsis muaj cov txheej txheem txo qis. Cov ntsiab lus Al2O3 tsis tsawg dua 9%, thiab cov ntsiab lus impurity me heev. Qhov nyuaj yog me dua li xim av corundum me ntsis thiab qhov toughness qis dua me ntsis. Feem ntau siv los ua cov cuab yeej abrasive, cov khoom siv ceramic tshwj xeeb thiab cov ntaub ntawv refractory siab heev.

04Xim av Corundum sib xyaw ua ke
Fused brown corundum yog ua los ntawm high-alumina bauxite ua cov khoom siv tseem ceeb thiab sib xyaw nrog coke (anthracite), thiab raug smelted hauv lub cub hluav taws xob kub siab ntawm qhov kub siab tshaj 2000 ° C. Fused brown corundum muaj cov qauv ntom thiab siab hardness thiab feem ntau siv rau hauv ceramics, precision castings thiab cov ntaub ntawv refractory siab heev.

05Corundum dawb sub-dawb
Subwhite corundum yog tsim los ntawm electromelting qib tshwj xeeb lossis qib thawj bauxite nyob rau hauv kev txo qis huab cua thiab tswj cov xwm txheej. Thaum yaj, ntxiv cov neeg sawv cev txo qis (carbon), tus neeg sawv cev settled (hlau filings) thiab tus neeg sawv cev decarburizing (hlau nplai). Vim tias nws cov tshuaj lom neeg thiab cov khoom siv lub cev ze rau dawb corundum, nws hu ua sub-white corundum. Nws qhov ceev yog siab dua 3.80g / cm3 thiab nws qhov pom tseeb porosity yog tsawg dua 4%. Nws yog ib qho khoom siv zoo tagnrho rau kev tsim cov khoom siv refractory siab heev thiab cov khoom siv hnav-resistant.

06Chrome corundum
Raws li cov corundum dawb, ntxiv 22% chromium, thiab nws yog ua los ntawm kev smelting hauv lub cub hluav taws xob arc. Xim yog xim liab-liab. Qhov nyuaj yog siab dua li xim av corundum me ntsis, zoo ib yam li dawb corundum, thiab qhov microhardness tuaj yeem yog 2200-2300Kg / mm2. Qhov tawv yog siab dua li dawb corundum thiab qis dua me ntsis ntawm xim av corundum.

07Zirconium Corundum
Zirconium corundum yog ib hom corundum dag uas ua los ntawm kev smelting alumina thiab zirconium oxide ntawm qhov kub siab hauv lub cub hluav taws xob arc, crystallizing, txias, crushing thiab tshuaj ntsuam. Lub ntsiab crystal theem ntawm zirconium corundum yog α-Al2O3, lub theem crystal theem nrab yog baddeleyite, thiab kuj muaj me ntsis ntawm iav theem. Cov crystal morphology thiab cov qauv ntawm zirconium corundum yog cov yam tseem ceeb uas cuam tshuam rau nws qhov zoo. Zirconium corundum muaj cov yam ntxwv ntawm kev nyuaj siab, kev tawv zoo, lub zog siab, cov qauv ntom ntom, lub zog sib tsoo muaj zog, cov khoom tshuaj ruaj khov, thiab kev tiv thaiv thermal zoo. Nws yog dav siv hauv kev lag luam abrasives thiab refractory cov ntaub ntawv. Raws li nws cov ntsiab lus zirconium oxide, nws tuaj yeem faib ua ob theem khoom: ZA25 thiab ZA40.