01.AL2O3
Lub melting point ntawm corundum (AL2O3) yog 2050 degree, qhov ceev yog 3.85 ~ 4.0lg·cm-3, thiab nws muaj thermal conductivity thiab tshuaj stability. Corundum feem ntau yog siv los ua cov khoom sib xyaw hauv cov khoom siv hlau. Nws feem ntau ntseeg tias AL2O3 tuaj yeem txo cov kev ua ntawm slag thiab tiv thaiv slag los ntawm corroding aggregates.
Nyob rau hauv cov nqe lus ntawm kev xaiv ntawm corundum hais, sub-dawb corundum muaj ib tug heev ntim ceev thiab dej nqus tus nqi; ntom corundum muaj ob peb impurities thiab ib tug kuj tsis tshua muaj dej nqus tus nqi; thiab xim av corundum muaj qhov nqus dej tsawg txawm tias nws muaj ntau qhov seem. Thaum siv ntom corundum thiab xim av corundum ua aggregates, tus nqi ntawm cov dej ntxiv raurefractory castablesyog qhov tsawg, uas muaj kev cuam tshuam zoo rau qhov ntom thiab ci ntawm cov castable. Los ntawm qhov kev xav ntawm microstructure, ntom corundum crystals yog cov paub tab thiab tuab heev; xim av corundum crystals loj hlob thiab tsim kuj zoo, tab sis tsis ntom; sub-dawb corundum tsis tsuas yog muaj ntau qhov seem, tab sis kuj muaj ntau cov kab nrib pleb loj thiab kaw qhov hws, uas cuam tshuam rau thermal shock stability ntawm cov khoom. Los ntawm kev xav ntawm dej nqus thiab microstructure, ntom corundum thiab xim av corundum yog qhov tsim nyog rau cov hlau ditch castables.
02. SIB
Silicon carbide tseem hu ua corundum lossis refractory xuab zeb, nrog qhov ntom ntawm 3.17-3.47g·cm-3, Mohs hardness ntawm 9.2-9.6, thiab melting point ntawm mus txog 2827 degree. Silicon carbide muaj qhov cuam tshuam hnyav, nrog rau qhov toughness modulus ntawm 4.76x{10}}MPa ntawm 25 degree, lub zog tensile ntawm 1.75x100MPa, thiab elastic modulus ntawm 2.8x10 5MPa ntawm 1500 degree . Tsis tas li ntawd, silicon carbide yuav tsum yog cov khoom siv semiconductor nrog cov thermal conductivity thiab qis thermal expansion coefficient. Raws li cov khoom siv nyiaj txiag, SiC tau siv dav hauv cov ntaub ntawv refractory vim nws qhov kev ua tau zoo heev.
SiC yuav oxidize ntawm qhov kub thiab txias los ua SiO2 thiab CO2. Ntawm 800 degree, SiC maj mam oxidizes rau SiO2; Thaum qhov kub thiab txias yog 1000 degree, SiC reacts hnyav nrog O2, tsim ntau silicon oxide kua theem los ua SiO2 iav tiv thaiv zaj duab xis; ntawm 1300 degree, iav tiv thaiv zaj duab xis maj mam precipitates quartz thiab absorbs dej thiab nthuav, ua rau cov zaj duab xis tiv thaiv tawg thiab oxidation tus nqi ntawm SiC nce. Ntawm 1500 degree -1600 degree, SiO2 iav tiv thaiv zaj duab xis muaj qee qhov tuab, uas tuaj yeem ua rau tsis muaj zog ntxiv oxidation ntawm SiC; Thaum qhov kub thiab txias yog 1627 degree, SiO2 reacts nrog SiC los tsim SiO thiab CO, yog li kev siv kub ntawm SiC yuav tsum tsis pub tshaj 1600 degree.
Nyob rau hauv cov hlau ditch refractory castable, SiC lub siab hnav tsis kam thiab siab txhua yam muaj zog tuaj yeem tiv taus qhov yaig thiab kev puas tsuaj ntawm cov castable los ntawm kev kub kub molten hlau thiab slag; Nyob rau tib lub sijhawm, SiC lub siab thermal conductivity thiab qis thermal expansion coefficient tuaj yeem tiv taus qhov rov qab thermal shock ntawm qhov kub thiab txias ntawm cov castable, thiab tsis muaj zog thermal puas ntawm molten hlau rau castable; Tsis tas li ntawd, cov tshuaj tiv thaiv ntawm SiC thiab huab cua tuaj yeem txo cov oxidation ntawm C hauv cov castable, thiab cov iav tiv thaiv zaj duab xis tsim tom qab SiC oxidation tseem tuaj yeem tiv thaiv cov khoom siv carbon hauv cov castable, yog li ua rau cov oxidation tsis muaj zog ntawm cov castable.
03.C
C muaj dej tsis zoo, thiab C-raws li cov ntaub ntawv muaj kev tiv thaiv zoo rau slag yaig thiab tsis yooj yim rau lo rau hlau; Nyob rau tib lub sijhawm, C muaj cov thermal conductivity loj, uas tuaj yeem tiv taus lub thermal shock ntawm high-temperature molten hlau thiab slag ntawm lub castable, yog li txhim kho thermal stability ntawm castable; Nyob rau hauv tas li ntawd, nyob rau hauv tej yam kev mob, C thiab Si hnov mob los tsim SiC fibers, uas muaj ib tug ntxiv zog rau lub castable. Txawm li cas los xij, cov ntaub ntawv C-raws li yooj yim rau oxidize ntawm qhov kub thiab txias, thiab lawv muaj qee yam khoom tsis haum, uas muaj kev cuam tshuam tsis zoo rau qhov ntom ntawm cov castable. Yog li ntawd, nyob rau hauv txoj kev loj hlob ntawm Ah03-SiC-C hlau ditch castables, C cov ntaub ntawv uas kuj tsis tshua muaj evaporation yuav tsum tau siv, thiab ib co ntawm cov antioxidants yuav tsum tau ntxiv rau cov castables.
Muaj ntau qhov chaw carbon rau hlau ditch refractory castables, xws li asphalt, graphite, carbon dub thiab coke. Tsuas yog asphalt, lwm cov khoom siv carbon yog cov khoom siv hydrophobic, thiab lawv siv dej ntau dua thaum tsim kho; Thaum asphalt belongs rau cov ntaub ntawv hydrophilic, thiab lawv siv dej tsawg dua thaum tsim kho, thiab muaj cov khoom tawg zoo. Nws feem ntau yog siv los ua cov pa roj carbon tseem ceeb rau Ah03-SiC-C hlau ditch castables. Txawm li cas los xij, asphalt evaporates tom qab cua sov, thiab thaum asphalt ntxiv ntxiv, qhov pom meej porosity hauv cov castable kuj nce. Yog li ntawd, nws yog ib qho tseem ceeb heev los tswj tus nqi ntawm asphalt ntxiv rau cov hlau ditch castable.
