Lub neej kev pab cuam ntawm lub qhov ncauj refractory castable muaj qhov cuam tshuam tseem ceeb ntawm kev ua haujlwm ntawm tag nrho cov cement ntau lawm kab. Thaum lub sij hawm siv cov rotary kiln kiln lub qhov ncauj castable, ntxiv rau qhov kub siab tshaj 1400 degree, nws kuj yuav tsum tau tiv thaiv cov kev cuam tshuam ntawm ceev ceev cua txias thiab kub cua ntws, siab kub cement clinker hnav thiab kub kub tsis zoo roj alkali corrosion thiab lwm yam. mechanical stress, thermal stress thiab chemical erosion Cov kev siv yog hnyav heev, thiab lub qhov ncauj castables yuav tsum muaj thermal shock tsis kam, hnav tsis kam thiab alkali tsis kam. Tam sim no, corundum-mullite, corundum-spinel thiab steel fiber reinforced refractory castables yog dav siv hauv kiln qhov ncauj castables. Txhawm rau txhim kho kev yaig tsis kam thiab thermal poob siab tsis kam ntawm lub qhov ncauj castables, lawv feem ntau Ntxiv qee cov silicon carbide. Lub qhov cub lub qhov ncauj castable tuaj yeem tsim ib qho tseem ceeb hauv ob sab phlu, tab sis vim tias nws yog cov khoom siv tawv tawv, nws yog ib qho nyuaj rau hloov mus rau qee qhov kev deformation xws li cib rotary kiln cylinder, thiab nws yog ib qho yooj yim rau tawg nyob rau hauv qhov kev txiav txim ntawm kev ntxhov siab. Lub toughness yog zoo heev los txhim kho nws lub neej kev pab cuam. Dub corundum yog grey-dub siv lead ua nrog -Al2O3 thiab hlau-aluminium spinel raws li lub ntsiab ntxhia theem. Nws muaj cov yam ntxwv ntawm siab toughness, kub tsis kam thiab ruaj khov thermomechanical zog, thiab feem ntau yog siv rau hauv abrasives. Raws li kev ua tau zoo ntawm cov corundum dub thiab cov kev ua tau zoo ntawm lub qhov ncauj castables, daim ntawv no yog ua raws li corundum-mullite kiln lub qhov ncauj castables, siv cov corundum dub ua ib feem ntawm cov khoom siv raw, thiab kawm txog cov nyhuv ntawm corundum dub nrog cov khoom sib txawv. qhov ntau thiab tsawg thiab nws qhov sib ntxiv ntawm lub qhov ncauj qhov cub. Kev cuam tshuam ntawm cov khoom castable.
1.1 Cov ntaub ntawv raw thiab cov phiaj xwm sim
Cov khoom siv tseem ceeb siv hauv kev sim yog: sintered mullite (2.73g·cm-3, particle loj muaj xws li 8-5, 5-3, 3-1mm), xim av corundum (3.92). g·cm-3, particle loj muaj xws li 3-1, Tsawg dua los yog sib npaug rau 1, 0.074mm), corundum dub (3.71g·cm{15} }, particle loj suav nrog 3-1, Tsawg dua lossis sib npaug rau 1, 0.074mm), silicon carbide (particle loj suav nrog Tsawg dua lossis sib npaug li 1, 0.074mm), -Al2O3 hmoov, silicon dioxide Micropowder thiab calcium aluminate cement, admixtures muaj xws li dej reducer thiab tawg-pov thawj fiber.
1.2 Kev npaj ua piv txwv thiab kev sim ua haujlwm
Sib tov txhua yam ntawm raw cov ntaub ntawv tusyees nyob rau hauv kev faib ua feem, ntxiv 5.6 feem pua (w) dej, thiab ces co thiab zoo, thiab kho rau 24 teev nyob rau hauv chav tsev kub ua ntej demoulding. Tom qab cov qauv raug kho ntawm qhov kub thiab txias, qhov ntom ntom ntawm cov qauv (YB/T5200-1993), compressive zog (GB/T5072-2008), flexural zog (GB/T3001-2007 ), linear hloov tus nqi (GB/T5988-2007).
kev tshwm sim thiab kev tsom xam
2.1 Kev cuam tshuam ntawm ntau qhov sib ntxiv ntawm corundum dub ntawm kev ua haujlwm ntawm lub qhov ncauj castables
Nrog rau qhov nce ntawm qhov sib ntxiv ntawm cov dub corundum Tsawg dua los yog sib npaug li 1 hli, qhov ntom ntom ntawm cov qauv qhia tau hais tias muaj kev poob qis, uas yog tshwm sim los ntawm qhov qis qis ntawm cov xim dub corundum dua li cov xim av corundum. Noj rau hauv tus account lub particle gradation factor, thaum cov ntsiab lus ntawm tsawg dua los yog sib npaug rau 1 hli dub corundum nce mus rau 25 feem pua (w) nyob rau hauv qhov kev xeem, tsis muaj silicon carbide tsawg dua los yog sib npaug li 1 hli tau ntxiv rau cov qauv, uas yog sib npaug rau Tsawg dua los yog sib npaug rau 1 hli dub corundum hloov tag nrho Less dua los yog sib npaug rau 1 hli xim av corundum thiab Less dua los yog sib npaug rau 1 hli. Silicon carbide tsawg dua lossis sib npaug li 1 hli, thiab qhov ntom ntom ntawm cov corundum dub yog ntau dua li ntawm silicon carbide, yog li qhov ntom ntom ntawm cov qauv zoo tuaj.
Lub zog flexural nyob rau hauv chav tsev kub ntawm cov qauv nrog tsawg dua los yog sib npaug rau 1 hli dub corundum ntxiv 5 feem pua (w) tom qab kev kho kub sib txawv yog siab dua li cov qauv uas tsis muaj dub corundum, thiab cov nyiaj ntxiv (w) ntawm tsawg dua los yog sib npaug rau 1 hli dub corundum yog nruab nrab ntawm 5 feem pua thiab 20 feem pua. Nyob rau hauv qhov ntau ntawm cov feem pua, nrog rau qhov nce ntawm cov nyiaj dub corundum ntxiv, qhov kev hloov pauv ntawm lub zog flexural ntawm cov qauv tom qab tuav ntawm 110 degree rau 24 teev tsis pom tseeb. Qhov no yog vim hais tias lub zog ntawm cov qauv ntawm 110 degree rau 24 h yog tsim los ntawm cov cement binder. muab. Tom qab 1100 degree rau 3h thiab 1350 degree rau 3h, chav tsev kub flexural zog ntawm cov qauv qhia ib tug qauv ntawm nce ua ntej thiab ces txo. Lub zog flexural feem ntau cuam tshuam los ntawm qib kev sib txuas ntawm cov matrix thiab cov aggregate, thiab cov txheej txheem tawg yog feem ntau aggregates. Kev puas tsuaj ntawm cov khoom lawv tus kheej, es tsis yog kev rub tawm ntawm cov khoom los ntawm matrix, qhov kev hloov ntawm lub zog flexural qhia txog lub zog ntawm kev sib raug zoo ntawm cov matrix thiab cov aggregate.
Lub zog compressive ntawm chav tsev kub ntawm cov qauv nrog 5 feem pua (w) ntawm dub corundum Tsawg dua los yog sib npaug rau 1 hli yog qis dua li ntawm cov qauv uas tsis muaj corundum dub. Nrog rau qhov nce ntawm cov nyiaj dub corundum ntxiv, lub zog compressive ntawm chav sov thawj zaug nce thiab tom qab ntawd txo qis. Lub zog compressive ntawm cov qauv kho ntawm 110 degree rau 24h yog cuam tshuam los ntawm qhov kev txiav txim ntawm cov binder thiab cov degree ntawm kaw packing. Raws li qhov xwm txheej ntawm qhov sib piv loj, qhov sib ntxiv ntawm cov corundum dub ua rau muaj kev hloov pauv hauv cov qib ntawm cov ntim kaw, yog li ua rau muaj kev hloov pauv ntawm lub zog compressive. Raws li qhov kev sim, thaum qhov sib ntxiv (w) tsawg dua lossis sib npaug rau 1 hli dub corundum yog li 10 feem pua, lub zog compressive ntawm cov qauv ntawm chav tsev kub yog siab tshaj tom qab khaws cia ntawm 1100 degree rau 3h thiab 1350 degree rau 3h, uas muaj feem xyuam rau qib ntawm cov tshuaj tiv thaiv hauv cov qauv. Nws muaj feem xyuam nrog kev ntim khoom ze ntawm cov khoom [7]. Raws li cov khoom siv heterogeneous, lub zog flexural ntawm castables yog yooj yim dua cuam tshuam los ntawm microstructures xws li tawg thiab inhomogeneities dua compressive zog.
Cov kab shrinkage ntawm cov qauv nrog tsawg dua los yog sib npaug rau 1 hli dub corundum ntxiv 5 feem pua yog qhov siab dua li ntawm cov qauv uas tsis muaj corundum dub, qhia tias muaj qhov pom tseeb sintering cov tshuaj tiv thaiv hauv cov qauv. Cov kev hloov ntawm cov qauv kab tom qab kev kho cua sov ntawm 1100 degree rau 3h pom cov yam ntxwv shrinkage, thiab tus nqi shrinkage maj mam txo qis raws li cov dub corundum ntxiv (w) nce nyob rau hauv thaj tsam ntawm 5% mus rau 20 feem pua. Cov qauv kho ntawm 1350 degree rau 3 h qhia cov yam ntxwv ntawm shrinkage ua ntej thiab tom qab ntawd nthuav dav hauv thaj tsam tsawg dua lossis sib npaug ntawm 1 hli dub corundum ntxiv (w) ntawm 5 feem pua rau 20 feem pua, uas cuam tshuam rau theem cov tshuaj tiv thaiv hauv lub piv txwv [8], qhia tias cov dub corundum ua ntej tsim cov kua qaub qis qis hauv cov qauv ua rau lub ntim ntim, thiab nrog rau qhov nce ntawm cov ntsiab lus dub corundum, ib theem tshiab yog tsim los nthuav, thiab cov theem tshwj xeeb xav tau ntxiv. tsom xam thiab kev pom zoo. Tsawg dua los yog sib npaug rau 1 hli dub corundum ntxiv tus nqi (w) ntawm 25 feem pua ntawm cov qauv kab hloov pauv hloov pauv, feem ntau vim tias dub corundum hloov silicon carbide, silicon carbide tseem yuav cuam tshuam cov kab hloov pauv ntawm cov qauv, silicon carbide ib nrab nyob rau hauv qhov kub thiab txias. Oxidation tshwm sim los tsim cov silicon dioxide, thiab tom qab ntawd cov tshuaj tiv thaiv tsim mullite, uas ua rau muaj qee qhov kev nthuav dav ntawm cov nyhuv. Nws kuj tseem qhia tau hais tias qhov ntim ntawm silicon carbide ntawm cov qauv yog ntau dua li ntawm corundum dub. Qhov ntim nthuav dav kuj ua rau qhov txo qis ntawm qhov kub thiab txias compressive zog ntawm cov qauv kho ntawm 1350 degree rau 3 h nrog qhov nce ntxiv ntawm cov xim dub corundum. Lub zog flexural ntawm chav tsev kub thiab lub zog compressive ntawm chav tsev kub yog yooj yim cuam tshuam los ntawm microscopic defects. Hauv kev sib piv, kev hloov ntawm cov kab hluav taws xob tas mus li raws li qhov ntsuas qhov ntsuas macro tuaj yeem cuam tshuam ntau lub xeev ntawm cov qauv tom qab sintering. Xav txog kev siv lub qhov ncauj qhov ncauj castable Cov xwm txheej, thermal poob siab tsis kam, lub zog thiab lwm yam kev ua tau zoo, cov nyiaj ntxiv (w) ntawm Tsawg dua lossis sib npaug rau 1 hli dub corundum yog li 15 feem pua.
