摘要
以高纯镁砂（5～2、≤2和≤0．088mm）、电熔铁铝尖晶石（3～1和≤0．088mm）为原料，亚硫酸纸浆废液为结合剂，配料混练后机压成型为Ф36mm×36mm及25mm×25mm×140mm的试样，经110℃24h烘干，然后于1650℃3h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FeAl2O4粒度（3～1或≤0．088mm）及加入量（质量分数为0、2％、4％、6％、8％、10％、12％）对方镁石一铁铝尖晶石质耐火材料性能的影响。结果表明：随着FeAl2O4添加量的增加，试样的常温强度、线膨胀系数、弹性模量降低。FeAl2O4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）FeAl2O4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FeAl2O4可完全反应为（Mg，Fe）Al2O4，以颗粒形式加入时，仅会在颗粒周围生成少量（Mg，Fe）Al2O4。
Periclase-hercynite specimens with sizes of Ф36 mm ×36 mm and 25 mm ×25 mm × 140 turn were prepared using high purity magnesia（5 -2, ≤2, ≤0.088 ram） and fused hercynite（3 - 1, ≤0. 088 mm） as starting materials, and lignosulfite as binder, batching, mixing, pressing, drying at 110℃; 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） Al2O4 ; when adding hercynite particle, a little （ Mg, Fe） Al2O4 forms around the particles.
出处
《耐火材料》
CAS
北大核心
2014年第2期89-93,共5页
Refractories
基金
国家自然科学基金项目(50774057)
关键词
方镁石-铁铝尖晶石
耐火材料
粒度
显微结构
抗热震性
periclase-hercynite
refractories
particle size
microstructure
thermal shock resistance
