Cov ntxhia ua ke ntawm cov qib siab alumina refractory cib tuaj yeem muab faib ua ob pawg loj: lub ntsiab crystalline theem thiab matrix theem. Lub ntsiab crystalline theem yog lub cev lub ntsiab ntawm lub siab alumina cib qauv, thiab ntxiv rau lub siab melting qhov taw tes, nws kuj yuav tsum tau txhim kho kom zoo thiab khov kho Matrix yog cov muab tub lim ntawm lub ntsiab crystalline theem. Tus naj npawb yog qhov me me, tab sis qhov muaj pes tsawg leeg ua tau nyuaj thiab cov txiaj ntsig tau pom tseeb. Cov ob qho kev ntxhia hauv av ntawm cov qib siab alumina yog qhov tseem ceeb.
Raws li qhov tseeb ntawm kev tsim cov tshuaj lom neeg ntawm cov qib siab alumina, vim qhov homogeneity ntawm cov khoom muaj pes tsawg leeg faib thiab ua cov thev naus laus zis, cov zaub mov muaj li ntawm cov qib siab alumina cib muaj cov khoom sib txawv, ntau, ntau thiab tsawg thiab cov xeev sib txuas. Qhov sib txawv hauv tus qauv ua rau muaj qhov sib txawv hauv kev ua haujlwm ntawm lub pob zeb refractory. Piv txwv li, cov qib siab alumina cib thiab mullite siab alumina cib yog qhov zoo ib yam hauv cov tshuaj lom neeg, tab sis lawv cov ntxhia hauv pob zeb sib txawv, yog li cov kev kub cev tsis zoo thiab kev ua haujlwm kub ntawm lawv cov khoom sib txawv heev. Yog li, cov ntxhia muaj pes tsawg leeg ntawm cov qib siab alumina thiab microstructure ntawm siab alumina cib kuj tseem yog cov khoom tseem ceeb hauv kev txiav txim siab cov khoom ntawm cov qib siab alumina cib.
Feem ntau hais lus, tus qauv ntawm siab alumina cib yog lub cev heterogeneous tsim los ntawm cov khoom muaj teeb meem zoo li qub thiab lub cev ntxi qhov hws. Porosity yog qhov tseem ceeb rau cuam tshuam rau qhov kub thiab txias thiab kub ntsuas kev ua tau zoo ntawm cov khoom, tshwj xeeb tshaj yog nyob rau hauv siab kub, qhov tsis kam ntawm cov khoom mus rau kev yaig sab nraud yog txo qis heev. Qhov tsim ntawm lub qhov hws yog qhov nyuaj: huab cua hauv cov khoom tsis tawm hauv lub sij hawm sib sau ntawm cov av siab-aluminium cib; qhov chaw seem tshuav tom qab cov khoom ya raws; cov khoom siv raw tsis tag nrho cov roj calcined, thiab qee cov ntsev yuav tsum tau decomposed tsis yog txhua txhua qhov, thiab cov khoom siv yuav tsum tau muab hlawv tsis tag. Hlawv; cov khoom sib tov yog tsis sib xws, thiab lub ntsws tsis sib npaug thaum kub yog siab.
Txawm li cas los xij, hauv kev tsim khoom ntawm qee qhov sib dua thiab kub-insulating high-aluminium bricks, qee tusyees faib tawm hws tau qhia. Lub hav zoov ntawm qhov hws ncaj qha cuam tshuam rau porosity, dej nqus, qhov ntom ntom ntom nti, thiab huab cua permeability ntawm siab alumina cib.
