2.2 Muaj pes tsawg leeg thiab cov qauv ntawm corundum-spinel castable tom qab siv
Lub thickness ntawm thawj txheej ua hauj lwm yog 230-250 hli, thiab pom meej morphology ntawm qhov cuam tshuam cheeb tsam nyob rau hauv qab ntawm lub 8 # ladle tom qab 91 lub sij hawm ntawm kev siv. Qhov seem tuab ntawm corundum-spinel castable yog li 120 hli, thiab cov txheej kub kub metamorphic yog nyias. Muaj qhov pom tseeb los ntawm cov kab nrib pleb sib npaug mus rau qhov kub ntawm qhov deb li ntawm 20 thiab 80 mm ntawm qhov kub kawg, thiab muaj qhov tshwm sim ntawm slag nkag mus rau hauv qhov tawg ntawm qhov tawg.
Txhawm rau txheeb xyuas qhov sib cuam tshuam ntawm molten slag thiab corundum-spinel castable thiab nkag siab txog kev puas tsuaj ntawm cov khoom, thaj tsam A raug coj los ua ib daim ntawv teeb. Scanning electron microscope thiab lub zog spectrometer tau siv los soj ntsuam qhov microstructure ntawm cheeb tsam thiab txiav txim siab cov khoom ntawm micro cheeb tsam. Lub microstructure ntawm kub nto ntawm A cheeb tsam ntawm cov residue tom qab siv los ntawm slag txheej mus rau quasi-protoplasmic txheej
Nws tuaj yeem pom tau tias thaj tsam A ntawm cov khoom seem tom qab siv tau tuaj yeem muab faib ua 3 txheej: slag txheej (txog 0.5mm), txheej permeable (6-8mm) thiab protoplasmic. txheej. Cov ntsiab lus nyob rau hauv lub slag teb nrog lub castable matrix los ua ib tug tsawg-melting theem (saib infiltration txheej nyob rau hauv daim duab 2), thiab nkag mus rau hauv lub castable los ntawm lub matrix, uas txhawb lub sintering thiab densification ntawm lub matrix. Muaj ntau cov pores nyob rau hauv cov txheej txheem protoplasmic, cov qauv yog xoob, thermal expansion coefficient ntawm permeable txheej thiab txheej protoplasmic tsis sib xws, thiab los ntawm cov kab nrib pleb tshwm sim ntawm ob. Nyob rau hauv txheej permeable, FeO, CaO thiab SiO₂ nyob rau hauv lub slag nkag mus rau hauv castable matrix. Nrog rau kev nkag mus ntxiv, nws cov ntsiab lus maj mam txo qis.
Txhawm rau txhawm rau txheeb xyuas qhov cuam tshuam ntawm slag nkag mus rau ntawm microstructure thiab micro-chaw nyob ib puag ncig ntawm cov castable, txhua cheeb tsam hauv daim duab 2 tau nthuav dav los saib xyuas thiab kev tshuaj xyuas EDS tau ua. Nyob rau hauv ib cheeb tsam ntawm lub slag txheej, lub microstructure ntawm castable matrix ntawm lub ntsej muag ua hauj lwm raug puas tsuaj, lub matrix yog infiltrated los ntawm ib tug loj npaum li cas ntawm cov kua theem, thiab cov qauv yog ntom. Cov theem tseem ceeb yog MgO-CaO-Al₂O₃-SiO₂-FeO qis melting point theem thiab CaO-Al₂O₃- SiO₂-FeO tsawg melting theem). Nyob rau hauv cov cheeb tsam b thiab c nyob rau hauv lub infiltration txheej, ib tug loj npaum li cas ntawm CaO, SiO₂, thiab FeO nyob rau hauv lub slag nkag mus rau hauv lub castable, uas ua rau densification ntawm matrix. Magnesium aluminium spinel theem. Hauv thaj tsam d ntawm cov txheej txheem protoplasmic, muaj ntau qhov pores nyob rau hauv matrix thiab cov qauv yog xoob, feem ntau magnesium-aluminium spinel theem, CaO-Al₂O₃ theem thiab corundum theem. Ntxiv nrog rau kev nkag mus rau hauv castable los ntawm matrix, lub slag kuj kis mus rau hauv cov castable raws cov kab nrib pleb.
2.3 Kev puas tsuaj mechanism ntawm corundum-spinel castable
Lub ntsiab kev puas tsuaj ntawm cov txheej txheem hauv qab ntawm lub ladle yog: thermal shock, mechanical stress, yaig thiab nkag mus ntawm slag. Ntawm lub ntsej muag ua haujlwm, cov theem tseem ceeb ntawm qhov qub castable yog magnesium aluminium spinel, CaO-Al₂O₃ thiab corundum. Nrog rau kev yaig thiab nkag mus ntawm slag rau hauv castable, magnesium-aluminium spinel theem hauv matrix absorbs FeO hauv slag, thiab corundum reacts nrog CaO thiab SiO₂ hauv slag los tsim cov calcium-aluminium-silicon low-melting. theem:
Raws li cov ntsiab lus ntawm SiO2, FeO thiab CaO hauv cov slag txo, cov ntsiab lus txheeb ze ntawm cov slag txo, yog li cov nyiaj slag ntxiv erodes thiab nkag mus rau hauv castable yog txo.
Ntawm qhov chaw ua haujlwm, cov theem ua kua hauv cov slag thiab cov theem ua kua tsim los ntawm cov tshuaj tiv thaiv nkag mus rau hauv cov castable. Vim yog qhov kub thiab txias gradient, sintering densification ntawm kub saum npoo yog tshwm sim, thiab matrix bonding theem raug puas tsuaj nyob rau tib lub sij hawm. Vim yog kev ntxhov siab thiab cua sov muaj kev ntxhov siab, cov kab nrib pleb yog tsim nyob rau hauv lub interface thiab txheej ntawm txheej txheej, ua rau muaj kev ua yeeb yam ntawm cov tshuaj tiv thaiv txheej. Tsis tas li ntawd, cov slag corrodes thiab nkag mus rau hauv castable raws cov kab nrib pleb, uas accelerates lub tev ntawm cov tshuaj tiv thaiv txheej los ntawm refractory. Kev rov ua dua ntawm qhov xwm txheej no thaum lub sijhawm ua haujlwm tau ua rau kev puas tsuaj ntawm cov khoom siv refractory.
nyob rau hauv xaus
(1) Corundum-spinel castables yog siv los hloov magnesia-aluminium-carbon cib nyob rau hauv qab ntawm lub ladle, uas tuaj yeem ua tau raws li cov txheej txheem smelting ntawm lub cub hluav taws xob puag ncig billet ntau lawm kab. Siv cov castables ib leeg, cov melting poob tus nqi ntawm lub hauv qab ua hauj lwm txheej ntawm lub ladle yog me me, kev ncaj ncees thiab huab cua nruj yog ntxiv dag zog rau, thiab qhov tshwm sim ntawm txias steel infiltration nyob rau hauv lub cib pob qij txha thiab offline vim txawv txawv ventilating bricks yog txo, thiab lub Kev nyab xeeb ntawm lub ladle kev ua haujlwm tau zoo dua qub thiab ua kom zoo dua Kev tu hom kev txhim kho thiab kev siv cov khoom siv refractory txo.
(2) Qhov kev puas tsuaj ntawm corundum-spinel castable feem ntau yog tshwm sim los ntawm cov tshuaj tiv thaiv ntawm slag thiab cov ntaub ntawv refractory. Tib lub sijhawm, thermal stress thiab mechanical stress kuj ua lub luag haujlwm tseem ceeb; Nyob rau hauv tas li ntawd, lub slag corrodes thiab nkag mus rau hauv lub castable raws lub tawg, accelerating Cov tshuaj tiv thaiv txheej peeled tawm ntawm cov khoom refractory. Kev rov ua dua ntawm cov txheej txheem no thaum lub sijhawm ua haujlwm tau ua rau kev puas tsuaj ntawm cov ntaub ntawv refractory.
