Lub ntsiab feem ntawmsilica cibyog silica, thiab polycrystalline transformation tshwm sim thaum lub sij hawm tsim cov txheej txheem, yog li cov expansion coefficient ntawm silicon bricks yog loj.
Silica refractory bricks yog tus cwj pwm los ntawm qhov kub thiab txias hauv qab load, tab sis tsis tshua muaj thermal shock stability, thiab qis refractoriness dua li cov high-alumina cib. cov cib no muaj qhov ntim nthuav dav ntawm 1.5 ~ 2.2% thaum lub sijhawm ua haujlwm kub yog 1450 degree. Txawm tias thaum tsim cov silica refractory cib, cov pwm yuav tsum raug txo kom tsim nyog raws li kev nthuav dav coefficient. Tawm hauv chav rau kev nthuav dav thiab ua kom cov silica firebricks raug qhov loj dua.
Silica cib ntau lawm piav qhia
Thaum lub sij hawm tsim cov silica bricks, kev hloov ntawm quartz, tridymite thiab cristobalite nyob rau hauv cov ntaub ntawv raw yuav rhuav tshem cov qauv siv lead ua qub thiab rov kho cov qauv. Vim tias qhov kev ua kom muaj zog loj thaum lub sijhawm tua hluav taws, qhov kev hloov pauv kub yog siab tab sis qeeb, ua rau muaj qhov loj ntim nthuav dav.
Qhov kev daws teeb meem tsim los ntawm adobe ntawm silica cib ntawm qhov kub thiab txias yog me me thiab nyuaj rau raug rho tawm haujlwm. Cov txheej txheem ntawm lub cev thiab tshuaj lom neeg cov txheej txheem uas tshwm sim thaum lub sij hawm firing txheej txheem ntawm silica firebricks yuav ua rau kom qhov luaj li cas ntawm bricks txog li 3m.
Kub hloov thaum tua hluav taws
Qhov kub ntawm silica firebricks hloov pauv zoo heev thaum lub sijhawm tua hluav taws: cov dej seem seem tawm ntawm cov cib ntawm 150 degree thiab pib decompose ntawm 450 degree; Lub cev qhuav dej ua tiav ntawm 450 ~ 500 degree, thiab yuav muaj qhov ntim ntawm 0.82% nyob rau hauv thaj tsam ntawm 550 ~ 650 degree. Cov tshuaj tiv thaiv theem pib ntawm 600 thiab 700 degree, thiab lub zog ntawm lub cib nce. Ntawm 1100 degree, qhov hloov pauv ntawm quartz nce, tab sis qhov tshwj xeeb lub ntiajteb txawj nqus ntawm cib pib txo qis. Lub sijhawm no, qhov ntim ntawm cib nce vim qhov hloov pauv ntawm quartz mus rau qhov tsis tshua muaj qhov sib txawv ntawm qhov sib txawv. Nws yuav tawg nyob rau hauv thaj tsam ntawm 1100 ~ 1200.
Kev hloov pauv tshwm sim thaum lub sij hawm cua sov txheej txheem ntawm silica bricks
Silica refractory bricks tsim cov ntim hloov thaum lub sij hawm cua sov, ntawm qhov kub thiab txias. Cov kev hloov ntawm silica tau muab faib ua theem ntawm 600 degree, 600 ~ 1100 degree, 1100 ~ 1250 degree thiab siab dua 1250 degree. Kev nthuav dav yuav tshwm sim ntawm 500 ~ 600 degree. Ntawm 700 ~ 800 degree, nws shrinks me ntsis. Lub shrinkage yuav ntau dua ntawm 1000 ~ 1100 degree. Thaum 1200 degree, quartz transformation nrawm thiab lub cev ntsuab pib nthuav dav. Qhov kev nthuav dav ua rau muaj qhov sib txawv ntawm qhov sib txawv raws li cov khoom sib txawv.
Disadvantages ntawm silica bricks
Qhov tsis zoo ntawm silica hluav taws cib yog cov thermal shock stability thiab tsis tshua muaj refractoriness, tab sis lawv muaj ib tug siab softening kub nyob rau hauv load thiab yog haum rau siv nyob rau hauv kiln linings nyob rau hauv acidic cua.
