放电等离子烧结Al2O3-ZrO2纳米复相陶瓷及其力学性能

陈国清; 张凯锋; 王国峰; 韩文波

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航空材料学报 ›› 2004, Vol. 24 ›› Issue (1) : 1-6.

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论文

放电等离子烧结Al₂O₃-ZrO₂纳米复相陶瓷及其力学性能

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Spark plasma sintering and mechanical properties of Al₂O₃-ZrO₂ nanocomposites

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摘要

采用醇水溶液加热法制备两相分散良好的纳米复合粉体,通过放电等离子超快速烧结制备Al2O3-ZrO2纳米复相陶瓷。研究了纳米第二相ZrO2对复相陶瓷致密化、烧结行为、力学性能以及微观结构的影响。从烧结激活能的观点解释了纳米第二相阻止基体Al2O3致密化的原因。放电等离子烧结得到了典型的晶间/晶内混合型纳米陶瓷,其弯曲强度高达1070MPa,断裂韧性达10.42MPa°m1/2。微观组织分析表明其中大量的内晶纳米颗粒阻止位错运动,使得基体氧化铝晶粒内形成复杂的位错组态,其主要特点为穿晶断裂和多重界面。

Abstract

The nano-sized powders of Al2O3/ZrO2 with excellent chemical homogeneity were synthesized by heating of ethanol-aqueous salt solutions method. Alumina-zirconia ceramic nanocomposites were superfast densified using spark plasma sintering(SPS) from nanoscale Al2O3/ZrO2 powders. The effect of zirconia nanophase on the densification, sintering behavior, mechanical properties, and microstructure of the composites was investigated. The composites are a typical intra/inter granular nanocomposites, where the maximum bending strength and toughness of the composites are 1070MPa and 10.42MPa°m1/2, respectively. The reasons that ZrO2 particles inhibit the densification and also retard the matrix alumina grain growth were explained from the activation energy. The microstructure observed indicate that lots of intergranular nanoparticles are more effective to pin dislocations, hence, complex dislocation morphology appears in the matrix grains of alumina. It can be deduced that intragranular fracture mode and multiple interfaces are the main characteristics of the samples.

导出引用

陈国清, 张凯锋, 王国峰, 韩文波. 放电等离子烧结Al₂O₃-ZrO₂纳米复相陶瓷及其力学性能[J]. 航空材料学报, 2004, 24(1): 1-6

CHEN Guo-qing, ZHANG Kai-feng, WANG Guo-feng, HAN Wen-bo. Spark plasma sintering and mechanical properties of Al₂O₃-ZrO₂ nanocomposites[J]. Journal of Aeronautical Materials, 2004, 24(1): 1-6

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