热处理温度对刚玉-尖晶石质浇注料性能的影响  

Effect of heat-treatment temperature on properties of corundum-spinel castables

作　　者：李代兵[1] 张晖[1,2] 张立明[1] 洪彦若[2] 毛庆龙[1] 齐志刚[1] 

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司,河南洛阳471039 [2]北京科技大学

出　　处：《耐火材料》2008年第6期428-431,共4页Refractories

摘　　要：以板状刚玉为骨料(粒度8～3,3～1和≤1 mm),板状刚玉细粉、活性氧化铝微粉(d50=2.26μm,w(Al2O3)>99%)、镁铝尖晶石粉、镁砂(粒度≤0.088 mm,w(MgO)>94.56%)为基质,纯铝酸钙水泥为结合剂,浇注振动成型为40 mm×40 mm×160 mm的样条。研究了不同热处理温度(1 450、1 550、1 600、1 650和1 700℃)对纯铝酸钙水泥结合的刚玉-尖晶石质浇注料性能的影响。采用XRD分析试样基质的相组成,用SEM观察试样显微结构和断口形貌,并用EDS对微区成分进行分析。结果表明:刚玉-尖晶石质浇注料常温抗折强度以及1 300℃风冷热震后抗折强度和强度保持率均随热处理温度的升高先增大后减小,1 600℃3 h热处理试样的抗热震性最好。1 600℃3 h热处理试样中存在作为应力缓冲机制的网状交织结构明显,对热应力的缓冲能力更强,同时,Al2O3在尖晶石中有适当程度的固溶,增强了基质间的结合强度,试样的断裂功增大,有利于提高材料的抗热震性。The specimens were prepared using tabular corundum （8-3,3-1 and 41mm） as aggregate,tabular co- rundum fines,α-Al2O3 micropowder （d50=2.26μm, w（Al2O3） 〉99% ）, magnesium aluminate spinel fines and magnesia （≤0.088 mm, w（MgO） 〉94.56%） as matrix, pure calcium aluminate cement as binder, then casting and vibrating into 40 mm×40 mm×160 mm. Effect of different heat-treatment temperatures （1450,1550,1600,1650 and 1700℃） on properties of pure calcium -aluminate cement bonded corundum-spinel castables for ladle was studied. The phase composition of matrix, microstructure and fracture appearance and spectrum composition was analyzed and observed using XRD,SEM and EDS, respectively. The results showed that the CMOR, HMOR and the residual ratios of bending strength after 1300℃ aircooling quenching changed from increase to decrease with the heat-treatment temperature increasing. The specimen treated at 1600℃ for 3 h performed the best thermal shock resistance, because there was obvious network structure,which could absorb the thermal stress. Additionally,a moderate solubility of Al2O3 in magnesium aluminate spinel enhanced the bonding strength of matrix, and the rupture of work of the specimens increased ,which was beneficial to enhancing thermal shock resistance.

关 键 词：刚玉-尖晶石质 浇注料 热处理温度 抗热震性 

分 类 号：TQ175.712[化学工程—硅酸盐工业] TF534.2[冶金工程—钢铁冶金]