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.
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