High alumina refractory cib yog hu ua siab alumina cib. Nws lub ntsiab ntxhia muaj pes tsawg leeg yog mullite, corundum thiab iav theem. Raws li Al2O3 cov ntsiab lus ntawm siab alumina cib nce, tus nqi ntawm mullite thiab corundum theem kuj nce, lub iav theem txo raws li, thiab cov refractory kuj thiab kub kev ua tau zoo ntawm cov khoom nce raws li. Kev nce qib ntawm cov iav theem thiab qhov txo qis hauv viscosity yuav rhuav tshem cov qauv ntawm alumina cib siab. Tshwj xeeb, qhov muaj KO thiab NaO tsis tsuas yog txo qhov kub ntawm cov kua theem, tab sis kuj txo cov viscosity ntawm cov kua theem, uas ua rau poob sai sai ntawm cov khoom kub-kub lub zog ntawm cov khoom. Rau cov khoom siv high-aluminium nrog cov ntsiab lus Al2O3 tsawg dua 72%, tsuas yog qhov kub-kub ruaj khov siv lead ua theem yog mullite, uas nce nrog qhov nce hauv Al2O3 cov ntsiab lus; rau cov khoom lag luam siab aluminium nrog cov ntsiab lus Al2O3 ntau dua 72%, qhov kub-kub ruaj khov siv lead ua theem yog mullite thiab Rau corundum, raws li Al2O3 cov ntsiab lus nce, tus nqi ntawm corundum nce thiab cov nyiaj ntawm mullite txo qis, uas ua rau muaj kev nce ntxiv. high-temperature lub zog ntawm cov khoom.
Yog li ntawd, siab alumina cib muab faib ua peb theem raws li cov ntsiab lus ntawm AL2O3. Thawj qib siab alumina cib muaj Al2O3 ntau dua 75%; qib thib ob siab alumina cib muaj 60%-75% Al2O3; thiab qib peb qib siab alumina cib muaj cov ntsiab lus txhuas ntawm 48%-60%. , Al2O3 tsawg dua 48% yog sib sau ua ke hu ua av nplaum cib.
Cov khoom ntawm qib peb qib siab alumina cib thiab av nplaum cib zoo sib xws, thiab lawv cov theem siv lead ua tseem ceeb yog mullite thiab iav theem. Vim tias nws qhov kev ua haujlwm kub kub zoo dua li cov av nplaum cib, cov khoom lag luam qib thib peb tuaj yeem siv tau rau txhua qhov chaw uas cov av nplaum siv tau. Lub ntsiab siv lead ua theem thib ob qib high-alumina cib yog mullite. Kev ua haujlwm kub ntawm cov khoom siv no yog qhov zoo dua li cov av nplaum cib: lub ntsiab siv lead ua theem ntawm thawj chav kawm high-alumina cib yog mullite thiab corundum. Txij li thaum corundum muaj cov tshuaj ruaj khov thiab hluav taws kub ntau dua li mullite, qhov siab dua cov ntsiab lus corundum hauv cov khoom. , qhov siab dua qhov kub tsis kam thiab yaig tsis kam ntawm cov khoom. Txawm li cas los xij, lub thermal expansion coefficient ntawm corundum yog loj dua li ntawm mullite, yog li qhov siab dua cov ntsiab lus corundum, qhov qis dua nws cov thermal shock kuj.
Cov khoom tseem ceeb ua haujlwm ntawm siab alumina bricks yog load softening kub thiab siab kub creep. Lub load softening kub nce nrog qhov nce ntawm AL2O3 cov ntsiab lus ntawm cov khoom, raws li qhia hauv daim duab hauv qab no. Lub load softening kub ntawm siab alumina bricks nrog ib tug Al2O3 cov ntsiab lus hauv qab no 70% nyob ntawm seb muaj pes tsawg tus piv ntawm lub mullite siv lead ua theem thiab cov kua theem. Rau cov khoom lag luam mullite-corundum nrog Al2O3 cov ntsiab lus ntawm 70% thiab 90%, raws li Al2O3 nce, qhov ntsuas kub tsis nce siab. Qhov no yog vim hais tias Fe2O3 thiab TiO2 Cheebtsam nyob rau hauv cov khoom raw nce me ntsis nrog rau qhov nce ntawm Al2O3, uas hloov cov khoom thiab cov khoom ntawm cov high-temperature kua theem. Lub mullite siv lead ua theem ib feem softens ntawm qhov kub thiab txias, thiab corundum kom muaj nuj nqis Txawm hais tias muaj kev nce ntxiv, nws tsis tuaj yeem tsim lub cev pob txha, uas ua rau tsis muaj qhov tseem ceeb ntawm qhov muag kub hauv qab load. Tsuas yog thaum Al2O3 cov ntsiab lus hauv cov khoom muaj ntau dua 90%, lossis txawm tias nce mus txog ntau dua 95%, lub ntsiab siv lead ua theem hauv cov khoom yog corundum, qhov sib txuas ncaj qha ntawm cov khoom siv lead ua tau zoo dua qub, thiab cov theem ua kua tsuas muaj nyob hauv. qhov khoob ntawm cov pob zeb siv lead ua, thiab nws cov load Lub softening kub yog ho nce.
Lub siab kub creep cwj pwm ntawm siab alumina bricks yog qhia los ntawm creep npaum li cas. Lub torsional creep tus nqi ntawm thawj-theem thiab thib ob-theem siab alumina bricks zoo ib yam. Ntawm 1200 degree, tus nqi nkag yog 0.25 ~ 0.29 × 10-5Rh, thaum lub thib peb qib siab alumina cib yog 3.5 × 10 ntawm qhov kub thiab txias. -5r·h, 10 npaug siab dua qib thib ib thiab qib thib ob siab alumina cib.
Phase tsom xam pom tias cov iav theem cov ntsiab lus nyob rau hauv thawj- thiab thib ob-theem siab alumina bricks yog 7% mus rau 9%, thiab hais tias nyob rau hauv peb-theem siab alumina cib yog 20%. Lub creep tus nqi tsis yog tsuas yog cuam tshuam nrog lub iav theem cov ntsiab lus, tab sis kuj rau cov muaj pes tsawg leeg thiab nws muaj pes tsawg leeg ntawm lub iav theem. Muaj feem xyuam rau kub viscosity. Cov kua viscosity ntawm qib peb-theem siab alumina cib ntawm 1200 degree tsuas yog ib nrab ntawm cov thawj-theem siab alumina cib thiab 26% ntawm qhov thib ob-theem siab alumina cib. Yog li ntawd, nyob rau hauv tus cwj pwm creep ntawm qib peb-theem siab alumina cib, lub iav theem plays lub luag hauj lwm, thaum ntxiv rau cov iav nyhuv nyob rau hauv thawj- thiab thib ob-theem bricks, grain ciam teb creep plays lub luag hauj lwm tseem ceeb. Qhov siab dua qhov sib txuas ncaj qha ntawm cov theem siv lead ua, qhov ntau dua qhov cuam tshuam ntawm cov ciam teb creep. Qhov pom tseeb dua yog. Obviously, kev txhim kho cov purity ntawm raw cov ntaub ntawv, hloov cov tshuaj thiab ntxhia muaj pes tsawg leeg ntawm lub matrix, txo tus naj npawb ntawm iav theem thiab kho cov muaj pes tsawg leeg ntawm lub iav theem thaum lub sij hawm ntau lawm yog tus yuam sij rau kev txhim kho high-kub creep zog. Nws tseem tuaj yeem txhim kho qhov kub siab ntim stability thiab slag kuj.
Lub thermal shock stability ntawm siab alumina bricks yog cov neeg pluag, uas yog ze ze rau cov theem ntawm cov khoom. Hauv kev tsim khoom, kev ntsuas xws li kho qhov sib xyaw ntawm cov av nkos thiab kev txhim kho cov qauv ntawm cov khoom siv feem ntau yog siv los txhim kho nws cov thermal shock stability. Ntxiv qhov tsim nyog ntawm cov khoom siv hluavtaws cordierite, zircon hmoov, thiab lwm yam rau cov khoom xyaw los tsim cov thermal shock stability thiab siab aluminium khoom tau ua tiav cov txiaj ntsig.
High alumina bricks yog dav siv los ua cov ntaub ntawv hauv ob sab phlu rau cov khoom siv thermal siv hauv kev lag luam ntau lawm xws li metallurgy, machinery manufacturing, petrochemical kev lag luam, lub zog thiab lub teeb kev lag luam.
