摘要
以烧结镁砂、镁铝尖晶石、电熔镁砂细粉、活性α-Al2O3粉和Cr2O3粉为原料,以亚硫酸纸浆废液为结合剂,于1 760℃保温110 min烧成后制备了镁质材料,并研究加入α-Al2O3和Cr2O3对复合材料的性能特别是抗热震性、抗蠕变性和高温强度的影响。结果表明:在镁质材料中添加α-Al2O3和(或)Cr2O3均能提高材料的抗热震性、高温强度和抗蠕变性;在添加α-Al2O3的条件下复合引入Cr2O3时,有利于镁质材料高温抗折强度和抗蠕变性的提高,但抗热震性有所降低,当复合引入7.5%质量分数的α-Al2O3和3%质量分数的Cr2O3时,镁质材料的综合高温性能较好。
Magnesia based refractories were prepared using sintered magnesia,magnesia-alumina spinel,fused magnesia powder,activated α-Al2O3 powder,and Cr2O3 powder as starting materials,sulphite lye as binder,firing at 1 760 ℃ for 110 min.Effects of α-Al2O3 and Cr2O3 additions on properties of magnesia based refractories especially the thermal shock resistance,creep resistance and hot strength were studied.The results show that,when adding α-Al2O3 and/or Cr2O3 to magnesia based refractories,thermal shock resistance,hot strength and creep resistance are all improved;when adding α-Al2O3 and Cr2O3 together,hot modulus of rupture and creep resistance are enhanced but thermal shock resistance is weakened;when adding 7.5 wt% α-Al2O3 and 3 wt% Cr2O3,the refractories has the optimum hot properties.
出处
《耐火材料》
CAS
北大核心
2010年第4期280-282,共3页
Refractories
关键词
镁质材料
抗热震性
抗蠕变性
高温强度
Magnesia based refractories
Thermal shock resistance
Creep resistance
Hot strength
