Aluminium oxide yog ib yam khoom inorganic nrog cov tshuaj mis A1203, ib qho tshuaj sib xyaw ua ke nrog lub ntsiab lus yaj ntawm 2054 ° C thiab lub ntsiab lus kub ntawm 2980 ° C. Nws yog ib qho siv lead ua ionic uas tuaj yeem ua tauionizedntawm qhov kub siab thiab feem ntau siv rau hauv kev tsim cov khoom siv refractory. Calcined alumina thiab alumina ob leeg muaj tib yam khoom, tab sis vim qee txoj kev tsim khoom thiab lwm yam txheej txheem sib txawv, yog li ob qho tib si hauv kev siv ntawm kev ua tau zoo thiab yog li yuav muaj qee qhov sib txawv.
Alumina yog cov khoom tseem ceeb ntawm txhuas hauv xwm, nws yuav raug tsoo thiab impregnated nrog cov kua sodium hydroxide kub siab kom tau txais cov kua sodium alumina; lim kom tshem tawm cov seem, txias cov lim dej thiab ntxiv cov siv lead ua los ntawm txhuas hydroxide, tom qab lub sijhawm ntev do, cov kua sodium alumina yuav lwj thiab ua rau txhuas hydroxide poob qis; cais cov precipitate tawm thiab ntxuav nws, tom qab ntawd calcine nws ntawm 950-1200 ° C kom tau txais c-hom alumina hmoov, calcined Alumina yog c-hom alumina. Cov ntsiab lus yaj thiab kub siab heev.
Calcined alumina tsis yaj hauv dej thiab kua qaub, tseem hu ua txhuas oxide hauv kev lag luam, thiab yog cov khoom siv raw rau kev tsim cov hlau txhuas; nws kuj tseem siv tau rau hauv kev tsim ntau yam cib refractory, refractory crucibles, refractory raj thiab cov cuab yeej siv hauv chav kuaj kub siab; nws kuj tseem siv tau ua abrasive, nplaim taws retardant thiab filler; siab purity calcined alumina kuj yog cov khoom siv raw rau kev tsim cov corundum dag, pob zeb liab dag thiab pob zeb xiav; nws kuj siv rau kev tsim cov board substrates rau niaj hnub loj-scale integrated circuits. Calcined alumina thiab alumina hauv cov txheej txheem ntau lawm thiab lwm yam yog qhov sib txawv me ntsis, cov cheeb tsam kev lag luam siv tau kuj sib txawv, yog li hauv kev yuav khoom ua ntej thawj zaug kom paub txog cov cheeb tsam tshwj xeeb ntawm kev siv.