Muaj ob hom corundum castable uas peb feem ntau pom, ib qho yog corundum refractory castable, thiab lwm qhov yog corundum mullite refractory castable.
Corundum castables yog ua los ntawm cov khoom lag luam refractory nrog corundum Al2O3 cov ntsiab lus ntau dua 90%, corundum yog lub ntsiab siv lead ua theem, thiab tus nqi tsim nyog ntawm dispersant, coagulant, stainless hlau fiber ntau, thiab cov mis nruj. Nws muaj ntau lub ntsiab lus xws li qhov kub zoo lub zog, hnav tsis kam thiab yaig tsis kam, siab thermal conductivity, thermal shock tsis kam, corrosion tsis kam, zoo sealing kev ua tau zoo, kev teeb tsa sai thiab lub zog thaum ntxov.
Ib qho refractory castable npaj nrog corundum li cov sib sau ua ke thiab hmoov ntxiv rau qee cov hlua khi. Nws muaj ntau dua cov neeg kho tshuab zog thiab cov kev ua los tiv thaiv kev ua haujlwm zoo dua li alumina refractory castable thiab mullite refractory castable, tab sis nws cov thermal poob siab ua rau me ntsis zuj zus. Mas siv cov ntaub ntawv hauv cov kav dej yob, cov tshuab ua kom sov lub tshuab ua kom sov lub tshuab hluav taws xob, cov khoom siv cua sov, cov cub tawg, thiab lwm yam.
Lub pob zeb corundum muaj nyob hauv kev npaj ntawm corundum refractory castable yog qhov ua kom cov kua roj, thiab cov qauv siv lead ua yog feem ntau tsis ntev. Lub corundum nws tus kheej tseem muaj cov thermal conductivity thiab hluav taws xob rwb thaiv tsev zoo, zoo heev rau tshuaj lom neeg ruaj khov thiab tiv taus cov neeg ua hauj lawm. Yog li no, corundum yog cov khoom siv rau refractory siab heev rau cov khoom siv tshuaj rau cov dej tsis muaj zog. Corundum feem ntau yog tsim los ntawm kev lag luam alumina lossis bauxite tom qab sintering lossis electrofusion. Yog li no, txhua qhov khoom siv corundum yog siv rau hauv kev lag luam. Qhov ntom thiab qhov hnyav ntawm cov ntoo corundum yog qhov loj, yog li cov nyhuv siv kuj tseem ceeb dua.
Corundum thiab mullite castables yog ua los ntawm ntom corundum thiab mullite ua cov khoom sib xyaw ua ke, thiab cov hmoov dawb corundum, α-Al2O3 micropowder thiab mullite hmoov yog cov hmoov zoo.
Kev ua tau zoo cov yam ntxwv ntawm corundum thiab mullite castable: Nws muaj qhov sib xws ntawm corundum thiab mullite castable; siab kub lub zog, thermal poob siab tsis kam thiab yam ntxwv peeling tsis kam; zoo thermal poob siab tsis kam, siab load softening kub, ntsuas kub nce tus nqi hloov pauv yog qhov me me, thiab qhov tshuaj tiv thaiv corrosion kuj zoo.
Cov mullite muaj nyob hauv corundum mullite refractory castables yog qhov me me hauv qhov xwm, thiab mullite cov ntaub ntawv siv nyob rau hauv kev lag luam yog cov artificially synthesized, nrog purity siab thiab qhov siab sib txawv. , Tus qauv zoo, qis nkag tus nqi, qis thermal nthuav dav, zoo thermal poob siab thiab muaj zog tshuaj lom neeg siab. Nws yog dav siv nyob rau hauv kev lag luam refractory, thiab nws tau tsim kho sai heev. Txawm li cas los xij, yog tias koj siv corundum thiab molai Nyob rau hauv cov nqe lus ntawm pob zeb piv, lub hardness thiab qhov tseeb ntom ntawm corundum tau zoo dua li ntawm mullite.
Tus qauv thev naus laus zis patent ntawm corundum mullite castable
Daim ntawv qhia 1:
Ib qho corundum mullite castable, uas yog tus cwj pwm hauv qhov uas castable yog tsim ntawm cov khoom hauv qab no:
55-70% ntawm cov paj laum sib xyaw nrog qhov loj me ntawm 0.05-1mm
Cov hmoov txhuam ua kom zoo nkauj nrog cov hmoov me me loj dua 0.06 hli 7-15%
8-11% ntawm mullite hais nrog cov khoom loj npaum li tsawg dua 1 hli
6-10% α-Al2O3 hmoov zoo nrog cov hmoov me me tshaj li 3μm
1-3% SiO2 hmoov nrog qhov loj me me dua 1μm
Txawv ceev 2-4%
Hlau oxide liab 2-4%
Xis mas 3-5%
Compound admixture 0.5-1.5%,
Cov khoom siv saum toj saud yog ua raws 100% cov huab hwm coj feem pua.
Daim ntawv qhia 2:
60% ntawm corundum hais nrog qhov loj me ntawm 0.05-1mm
11% ntawm corundum hmoov hmoov zoo nrog cov khoom loj me me tsawg tshaj li 0.06mm
9% ntawm mullite hais nrog cov particle loj me dua 1mm
Α-Al2O3 zoo hmoov nrog cov hmoov me me tshaj li 3μm 7%
SiO2 hmoov nrog qhov loj me uas tsawg dua 1μm 2% nrawm 3% hlau oxide liab 3% xis mas 4% sib tov admixture 1%.
Tus qauv tshuaj lom neeg xav tau kev cai ntawm corundum tau piav qhia nyob hauv tus qauv mis ib qho thiab ob lub mis: Al2O3≥99.0 | ^; kev siv tshuaj ntau rau kev thov mullite yog: Al2O3+SiO2≥97.0 %; lub SiO2 micropowder siv micropowder txawv teb, thiab nws cov ntawv sau ua ke yog: ： SiO2≥97.5 %; cov cement tsawg kawg yog ib qho ntawm silicate lossis calcium aluminate xis mas; cov tshuaj pleev xim admixture yog sib xyaw ua ke ntawm citric acid aqueous tov, tshuaj dawb huv trisodium phosphate tov thiab lignin sulfonic acid Calcium tov yog sib xyaw raws li tus piv ntawm 2-3.5: 1.25-1.5: 1-2.
Tus qauv txheej txheem suav nrog cov hauv qab no:
(1) Ua ntej sib xyaw ntawm cov roj matrix hmoov: zoo corundum hmoov, α-Al2O3 hmoov, SiO2 hmoov, nrawm, liab hlau oxide, xis mas, sib tov admixtures raws li cov txheej txheem, muab tso rau hauv lub pob zeb thiab sib tov rau 30- 50 feeb. Ua SiO2 micropowder thiab Al2O3 micropowder tag nrho tusyees sib xyaw, thiab cov tshuaj sib xyaw matrix hmoov yuav tsum muab ntim thiab khaws cia rau siv tom qab;
(2) Muab cov weighed corundum hais, mullite hais thiab cov ua ntej sib xyaw matrix hmoov rau hauv cov khoom sib tov thiab sib tov rau 5-15 feeb, ntxiv 5-8% ntawm qhov hnyav ntawm cov khoom siv tag, sib tov thiab do tusyees, Txhaj rau hauv cov pwm ua kom huv thiab muab tsau, muab tso rau ntawm lub rooj ua kom zoo siab rau kev co moulding los yog siv cov pas nrig ua kom nrov los ua kom pom kev hauv txheej, thiab tos kom txog thaum dej ntws;
(3) Txoj kev kho kom zoo rau 2 ～ 4 hnub tom qab pov thiab demoulding, thiab tom qab ntawd ziab ntawm 100 ～ 120 ℃ rau tsis pub tsawg tshaj 24 teev. Tom qab cov dej noo yog tag nrho tawm, cov khoom lag luam yog hlawv rau hauv lub qhov cub qhuav ntawm 1600 ℃. Cov khoom lag luam tuaj yeem siv tom qab tau txheeb thiab ntim khoom.
