具有氧化锆包覆方镁石微结构的镁锆砖的抗折和抗热震性  

Modulus of rupture and thermal shock resistance of magnesia-zirconia bricks with the microstructure of periclase covered by zirconia

作　　者：陈松林[1,2] 袁林[1] 冯中起[1] 曾鲁举[1] 刘锡俊[1] 陈雪峰[1] 王俊涛[1] 孙加林[2] 

机构地区：[1]中国建筑材料科学研究总院瑞泰科技股份有限公司,北京100024 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2011年第9期1141-1145,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(50172007);国家自然科学重点基金资助项目(50332010)

摘　　要：在正交试验确定的工艺参数条件下,改进工艺制备出具有氧化锆包覆方镁石显微结构的镁锆砖.在此微观结构中,方镁石和氧化锆直接结合,两相邻方镁石晶粒被氧化锆间隔,方镁石晶粒被氧化锆包裹,方镁石晶内存在封闭小气孔和氧化锆晶粒.由于方镁石被氧化锆包裹中存在氧化锆相变,相变微裂纹吸收断裂能起增韧的作用;同时,方镁石晶粒内的微气孔能缓解热应力,使镁锆材料的抗热震性能和高温强度均得以改善.方镁石晶粒内的细小氧化锆晶粒具有钉扎效应,能减少和阻止镁锆砖的高温蠕变滑移,提高了材料的高温抗折性能.Magnesia-zirconia bricks with the microstructure of periclase covered by zirconia were prepared by improved technology after the technological parameters were determined by orthogonal test. In the microstructure of the magnesia-zirconia bricks, periclase crystals directly bond zirconia and zirconia is between two adjacent periclasc crystals; meanwhile, many micro closed porosities and fine zirconia crystals exist in the periclase crystals. Microcracks due to phase transformation of zirconia in the magnesia-zirconia bricks can absorb the fracture energy and result in the thermal shock performance of materials increasing; at the same time, micro closed porosities in the magnesia-zirconia bricks can reduce the heat stress and improve the mechanical properties of materials at high temperature. Fine zirconia crystals in the periclase crystals possess pinning effects which diminish and prevent creeping slippage in MgO-ZrO2 , and ulti- mately improve the hot modulus of rupture of the magnesia-zirconia bricks.

关 键 词：耐火材料 氧化镁 氧化锆 高温抗折强度 抗热震性能 

分 类 号：TQ175.73[化学工程—硅酸盐工业]