Al+Mg-Al、Al+Si复合添加剂对低碳镁碳砖抗氧化性的影响

Influence of Al+Mg-Al alloy and Al+Si composite additives on oxidation resistance of low carbon MgO-C brick

以电熔镁砂、天然鳞片石墨、炭黑和沥青为主要原料,分别以总质量分数为4%的金属Al和Mg-Al合金、金属Al和Si为抗氧化剂,以酚醛树脂为结合剂,制备了两组w(C)≈6%的镁碳砖试样,并研究了试样在氧化气氛下分别经600、1000和1400℃保温2h后的抗氧化性。结果表明:只添加金属Al粉时,试样在1400℃下有较好的抗氧化性能;只添加Mg-Al合金时,试样在600℃下具有较好的抗氧化性能;金属Al粉与Mg-Al合金按2:2质量比添加或金属Al粉与Si粉按3:1质量比复合添加时,试样在600～1400℃范围内的抗氧化效果均较好。

Two groups of MgO-C brick specimens with about 6% C were prepared using fused magnesia,raw flaky graphite,carbon black and pitch as main starting materials,and phenolic resin as binder,4% of Al＋Mg-Al alloy and Al＋Si as additives,respectively.Oxidation resistance of specimens was studied after firing at 600,1 000,and 1 400 ℃ for 2 h in oxidation atmosphere.The results show that the specimens with Al have better oxidation resistance at 1 400 ℃;those with Mg-Al alloy exhibit better oxidation resistance at 600 ℃;those with 2：2 mass ratio of Al to Mg-Al alloy,or 3：1 mass ratio of Al to Si exhibit better oxidation resistance from 600 to 1 400 ℃.