以高纯镁砂（5～2、≤2和≤0．088 mm）、电熔铁铝尖晶石（3～1和≤0．088 mm）为原料，亚硫酸纸浆废液为结合剂，配料混练后机压成型为36 mm ×36 mm及25 mm ×25 mm ×140 mm的试样，经110℃24 h烘干，然后于1650℃3 h热处理。采用热膨胀仪、弹性模量仪、SEM等对试样进行了分析研究，分别研究了FeAl2 O4粒度（3～1或≤0．088 mm）及加入量（质量分数为0、2％、4％、6％、8％、10％、12％）对方镁石-铁铝尖晶石质耐火材料性能的影响。结果表明：随着FeAl2 O4添加量的增加，试样的常温强度、线膨胀系数、弹性模量降低。FeAl2 O4以细粉形式加入时，试样的常温强度、弹性模量比以颗粒形式加入的要大；加入约4％（w）FeAl2 O4就能明显改善镁质制品的抗热震性，其抗热震提高的机制以微裂纹增韧为主；固定尖晶石加入量为8％（w），尖晶石以细粉形式加入时，试样中FeAl2 O4可完全反应为（Mg，Fe）Al2 O4，以颗粒形式加入时，仅会在颗粒周围生成少量（Mg，Fe）Al2 O4。
Periclase-hercynite specimens with sizes of36 mm ×36 mm and 25 mm ×25 mm ×140 mm were prepared using high purity magnesia(5 -2,≤2,≤0.088 mm)and fused hercynite(3-1 ,≤0.088 mm)as starting materials,and lignosulfite as binder,batching,mixing,pressing,drying at 1 10 ℃ for 24 h,and then firing at 1 650 ℃ for 3 h.Effects of particle sizes (3-1,≤0.088 mm)and additions (0,2%,4%,6%,8%, 10%,12% in mass)of hercynite on properties of periclase-hercynite bricks were investigated by a thermo-dilatometer,an elasticity modulus tester,etc.The more the added hercynite,the lower the cold strength, the thermal expansion coefficient and the elasticity modulus of periclase-hercynite refractories.The speci-mens with hercynite powder have higher cold strength and elasticity modulus than those with hercynite par-ticles.The thermal shock resistance is improved obviously when the hercynite addition is 4% because of the microcrack toughening.Fixing the hercynite addition at 8%,when adding hercynite powder,hercynite fully reacts forming (Mg,Fe)Al2 O4;when adding hercynite particle,a little (Mg,Fe)Al2 O4 forms around the particles.
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