中文摘要：

以电熔镁砂、炭黑、石墨以及Si粉为原料,热固性酚醛树脂为结合剂,Fe粉为催化剂,分别经1200和1400℃埋炭热处理后制备了MgO-C试样,研究了不同温度下催化剂Fe粉对试样的物相组成、显微结构以及抗热震性能的影响。结果表明：Fe粉的加入对试样的物相组成基本无影响,经1200℃热处理后的试样中生成了新物相SiO_2和Mg_2SiO_4;当温度升高至1400℃时,试样中的SiO_2参与反应生成了新相SiC。不含Fe粉试样中生成的Mg_2SiO_4呈柱状,而含Fe粉试样中的Mg_2SiO_4呈晶须状。经不同温度热处理后,含Fe粉试样经热震1次后（1100℃,水冷）的残余抗折强度均高于不含催化剂的,Fe粉的加入使试样具有更好的强度和更加优异的抗热震性能。

英文摘要：

Mg O-C refractories specimens were prepared using fused magnesia,carbon black,graphite,Si powders as starting materials,hot-setting phenolic resin as binder and Fe powder as catalyst. After carbon embedding treatment at 1 200 ℃ and 1 400 ℃,respectively,the influence of Fe powder on the phase composition,microstructure and thermal shock resistance was studied. The results show that Fe powders have little influence on phase composition; some new phases such as SiO_2 and Mg_2SiO_4 form after 1 200 ℃ treatment. After 1 400 ℃ treatment,SiO_2 reacts forming a new phase SiC. The morphology of Mg_2SiO_4 is columnar in the specimens without Fe powder,while the morphology of Mg_2SiO_4 is whiskers in the specimens with Fe powder. Adding Fe powder increases the residual strength ratio of CMOR after one thermal shock from 1 100 ℃ to water quenching for the heat-treated specimens,and improves the strength and thermal shock resistance.