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中文摘要：
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.
英文摘要：
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.
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