镁碳砖中碳的氧化是影响其使用寿命的主要原因.利用真空烧结制备的Al4SiC4粉体作为抗氧化剂提高镁碳砖的抗氧化性.加入Al4SiC4 3%～5%时,碳损失量降低50%～60%(1500 ℃,6 h).Al4SiC4能还原被氧化的碳,同时将自身的碳作为游离碳加入到镁碳砖中补充碳源.Al4SiC4分解生成的Al2O3、SiC与MgO反应最终生成镁铝尖晶石和镁橄榄石在砖体表面形成保护层防止进一步氧化.
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