Corundum cib los yog mullite cib uas kub kub expansion?
Corundum bricks yog ua los ntawm ntom alumina clinker. Cov qauv siv hluav taws xob muaj qhov zoo ntawm qhov siab melting point, ruaj khov siab kub ua haujlwm, zoo mechanical zog thiab hnav tsis kam ntawm chav tsev kub thiab kub. Zoo heev hlau corrosion kuj, oxidation kuj thiab txo cov khoom. Cov txheej txheem ntau lawm ntawm mullite cib zoo ib yam li lub siab alumina refractory cib. Synthetic mullite clinker yog siv los ua cov khoom siv thiab cov hmoov zoo yog siv los ua hluavtaws mullite clinker, los yog dawb corundum, quartz hmoov thiab cov av nplaum ntshiab yog siv los npaj cov hmoov zoo sib npaug rau mullite. Kev faib ua feem ntawm cov khoom siv granular thiab hmoov zoo, feem ntau yog 45% mus rau 55% ntawm cov khoom siv granular thiab 55% mus rau 45% ntawm cov hmoov zoo (<0.088mm). Mix evenly and form under high pressure. The sintering temperature is 1550~1600, and when the molten mullite clinker is used as the particle material, the sintering temperature should be higher than 1700%C.
Thermal expansion yog ib yam khoom kub kub ntawm refractory cib, uas yog hais txog qhov ntev ntawm refractory cib thaum cua sov. Nws txoj kev qhia tau muab faib ua linear expansion rate thiab linear expansion coefficient. Linear expansion rate yog hais txog qhov sib piv feem pua ntawm qhov ntev ntawm cov qauv firebrick thaum nws nce los ntawm chav tsev kub mus rau qhov ntsuas kub. Qhov nruab nrab linear expansion coefficient yog hais txog tus txheeb ze hloov pauv ntawm qhov ntev ntawm cov qauv firebrick los ntawm chav tsev kub mus rau qhov ntsuas kub, nrog qhov nruab nrab nce ntawm 1. Lub ntim expansion ntawm qhov hluav taws kub cib yuav tshwm sim tom qab cua sov, tab sis thermal expansion ntawm ntau hom sib txawv vim qhov sib txawv ntawm cov hluav taws kub thiab kev ua haujlwm. Lov ib lub cib, siab aluminium khw, pem hauv ntej khw, thiab lwm yam., qhov kev nthuav dav ntawm kev sib xyaw ua ke tau nce thiab sib xws. Thaum silicon bricks yog complex vim polycrystalline transformation.
