本文選題：鎂鋁尖晶石 + 膨脹機制��； 參考：《耐火材料》2017年04期

【摘要】：為了研究生成鎂鋁尖晶石的反應(yīng)過程,以電熔鎂砂粉和α-氧化鋁微粉為原料制備粉末成型體合成鎂鋁尖晶石,通過考察在1 300~1 400℃空氣中反應(yīng)一定時間(1.5~25 h)后的永久體積膨脹率、線膨脹率、相組成及顯微結(jié)構(gòu),研究了氧化鎂和氧化鋁反應(yīng)生成鎂鋁尖晶石的膨脹機制。結(jié)果表明,反應(yīng)體系的永久膨脹率隨成型壓力的增加而增大,這除了由反應(yīng)前后各組成密度差引起之外,還與反應(yīng)過程中可能存在的Kirkendall效應(yīng)有關(guān);永久線膨脹率隨時間的變化規(guī)律遵循固相擴散理論,據(jù)此計算出活化能為304.0 k J·mol-1。
[Abstract]:In order to study the reaction process of the formation of magnesia-alumina spinel, magnesia-alumina spinel was synthesized from fused magnesia powder and 偽 -alumina powder. The permanent volume expansion ratio, linear expansion rate, phase composition and microstructure of magnesia-alumina spinel formed by reaction of MgO with alumina were studied by investigating the permanent volume expansion rate, linear expansion rate, phase composition and microstructure of the reaction at 1 300 鈩，

本文編號：1927388