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机构地区:[1]中国科学院上海硅酸盐研究所,上海200050
出 处:《无机材料学报》1998年第3期327-332,共6页Journal of Inorganic Materials
摘 要:本文对商用γ-Al2O3粉体预处理后,采用热压工艺,制备了高性能细晶粒纯氧化铝陶瓷材料,1450℃/30min热压获得晶粒尺寸为0.5μm、抗弯强度为500±45MPa;1550℃/30min获得断裂韧性为5.7±0.5MPam1/2的氧化铝材料.并对氧化镁添加剂的作用进行了研究:在1420℃/30min制备了相对密度为99.3%,抗弯强度为584±51MPa的氧化铝材料;并发现了氧化镁在氧化铝中的不同作用机理.Fine-grained pure alumina ceramics were fabricated by hot-pressing process from a commercial γ-Al2O3 powder. The relations between mechanical properties, microstructure and hotpressing temperature were discussed. Two kinds of alumina ceramics were obtained under different hot-pressing conditions. One, the particle size was about 0.5μm and its flexure strengthwas 500±45MPa at 1450℃/30min, and the other, fracture toughness was 5.7±0.5MPa.m1/2 at1550℃/30min. Also, the effect of MgO additives on alumina ceramics was studied. The resultsshowed that the process was the critical factor to decide the role of MgO additives. Moreover,under the hot-pressing conditions of 1420℃/30min ) the alumina with relative density of 99.3%and fiexure strength of 584±51MPa was obtained.
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