高性能细晶粒氧化铝陶瓷材料的制备与研究  被引量:20

Preparation and Research of Fine-Grained Alumina with High Mechanical Properties

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作  者:彭晓峰[1] 黄校先[1] 张玉峰[1] 

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.

关 键 词:细晶粒 氧化铝陶瓷 陶瓷材料 

分 类 号:TQ174.758[化学工程—陶瓷工业]

 

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