Dab tsi yog qhov txawv ntawm refractory cib thiab ib txwm cib?
Rau kev siv hauv tsev, xws li ncu, barbecue grills thiab qhov cub, cov cib refractory siv feem ntau yog cov av nplaum uas muaj cov alumina thiab silica, cov ntsiab lus muaj peev xwm tiv taus qhov kub thiab txias.
Txawm hais tias alumina muaj qhov cuam tshuam zoo, silica yog ib qho zoo heev insulator. Qhov ntau alumina tam sim no nyob rau hauv qhov sib tov, qhov kub ntawm lub cib yuav dhau mus (qhov tseem ceeb rau kev siv hauv kev lag luam) thiab cov khoom yuav kim dua. Silica muaj ib tug greyish tint, thaum alumina muaj ib tug yellowish tsos.
