Cov qaub qaub calcium aluminate cement refactory castables yuav muab faib ua peb pawg. Ib hom A MAAs castable nrog ib lub pob zeb hauv paus ntawm CA-raws li cov cement ua ib phau ntawv. Lub pob zeb hauv pes tsawg yog tsim los ntawm CA2 (li 60%), thiab tas yog B hom MAAs castable nrog cement CA thiab ib qho nyiaj me me ntawm C2AS raws li ib phau ntawv. Lub C-hom MAAs castable nrog lub pob zeb hauv paus ntawm CA2 thiab ib qho cement uas yuav luag tsis muaj CA li ib phau ntawv.
Hom A Refactory castable: Tag nrho cov qib clay los yog alumina aggregate siab thiab hmoov yog blended hauv ib qho kev faib ua feem, thiab A hom maas ntxiv. Vim hais tias hom A MAAs muaj qhov chaw ceev thiab muaj tus zauv yooj yim hauv qhov kub thiab txias, nws tso tawm ntau heev ntawm tshav kub hauv cov theem pib ntawm cov dej (li ntawm 10%) (li 80% ntawm tag nrho cov tshav kub), yog li nws yuav tsum tau muab tsuag thiab txias lub sijhawm twg los tau thaum lub caij ntuj sov cov txheej txheem. Lub sijhawm thaum lub caij ntuj no, nws yuav tsum tau them cov ntaub ntub dej los yog cov yas yas kom lub ntsej muag ntawm qhov chaw pov tseg. Lub hom phiaj yog kom tsis txhob muaj qhov kub ntawm lub ncuav los yog precast block yog siab dhau heev lawm, qhov dej ntom ntub evaporates tawm sai heev, thiab tsis tuaj yeem ua tiav. Looseness tshwm sim, ua rau muaj kev txo qis zog. Tom qab muab pov rau ntawm Ib hom cement castables, qhov pib qhov tuaj yeem tiav tom qab 1 ~ 3 h. Tom qab 6 ~ 8 teev, qhov kawg yuav tsum tiav, thiab lub zog yuav nce zuj zus. Txoj kev kho 1d tuaj yeem ncav cuag li 75% ntawm lub zog qhov kawg, thiab 3d tuaj yeem ncav cuag li 85% ~ 95%. Tom qab 7d, lub zog qhov kawg tau nce.
Qhov zoo ntawm cov A-type MAA castable nyob ntawm qhov zoo ntawm cov khoom sib sau ua ke siv, qhov sib piv ntawm cov khoom sib sau ua ke, cov nyiaj maas ntxiv, dej noj thiab kev kho kub. Cov aggregate yuav tsum muaj sintering txaus, compactness, tsawg porosity thiab cov ntsiab lus tsis muaj kev txwv. Aggregate particle ratio tsim yuav tsum tau cov feem ntau compact packing, yog li ntau qib piv yuav tsum tau saws. Feem ntau siv cais: 15 ~ 7mm20%, 7 ~ 3mm25.%, 3 ~ 0.088mm20%, <0.088mm (los="" sis=""><0.074 hli)="" 10="" ~=""> Ib hom cement 15 ~ 25%, tuaj yeem ntxiv cov micro-dej txo tus neeg sawv cev kom txo cov dej siv, txhim kho kev tsim kho thiab nce ntau ntu.
Cov nyhuv ntawm cov khoom sib txuas ntxiv yog: qhov nce ntawm cov nyiaj ntxiv ntawm cov khoom sib ntxiv, lub zog tom qab kho ntawm chav kub kuj nce, tab sis tom qab qhov ntau ntxiv ntau tshaj 25%, qhov kev loj hlob tsis loj hlob tsis loj, thiab thaum twg cov nyiaj maas ntxiv yog ntau dhau lawm, CaO hauv qhov kev sib tsoo yuav muaj feem rau A12O3. Thiab SiO2 generates ib tug loj npaum li cas ntawm C2AS los yog CAS2 qis-melting theem, uas zoo heev txo cov kev kub ntawm qhov castable. Yog li no, cov nyiaj ntxiv ntawm cov cement ntxiv yog 12-15%.
Cov nyhuv ntawm cov dej ntxiv yog: qhov qis dua tus nqi siv dej, qhov siab zog ntawm lub qhov khoom siv thaum tswj cov nqi nquag ntawm qhov castable. Yuav kom txo tau cov dej, 0.01% 0.2% ntawm dej txo tus neeg sawv cev yuav ntxiv tau.
Cov nyhuv ntawm kev kho kub rau lub zog ntawm A-hom cement burnt cov ntaub ntawv yog pom tseeb. Lub zog zoo yog feem ntau ntawm kev kho ntawm 20 ° C. Hauv qab no kub, qhov dej tsis tiav thiab lub zog tsis yooj yim mus cuag tus nqi siab tshaj plaws; saum toj siab no, lub zog txo qis tom qab ncav cuag tus nqi siab tshaj.
Cov sib tov sib xyaw npaj los ntawm siv cov calcium aluminate MAAs zoo li ib lub binder thiab refractory aggregate thiab cov hmoov hauv ib qho piv tau ncaj qha siv tom qab ntxiv dej, nplawm, vibrating casting, tua thiab ci. Cov qaub qaub calcium aluminate cement muaj ib yam qis hlau thiab muaj hom loj heev. Tuam Tshoj ua rau muaj hom hlau uas tsis tshua muaj siab, uas yog tsim los ntawm ntuj tsawg-silicon bauxite (SiO2 cov ntsiab lus tsawg dua 8%) thiab limestone.
Oralary calcium aluminate xis mas ua ke muaj ntau daim ntawv thov, thiab ntau hom calcium aluminate xis mas siv tau los siv raws li kev ntsuas kub thiab siv tej yam kev mob, thiab txawv refractory aggregates thiab hmoov ntxiv. Feem ntau siv ntau yam khoom siv hlau, cov khoom siv ua hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob thiab lwm yam khoom siv hauv chaw kho cua sov cua sov, cua sov, qhov cub tawg, khawb taub thiab lub taub hau, hlua ntawm lub valve.
