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科学通报  2015 

利用燃烧反应快速升温方法制备Al2O3/YAG共晶陶瓷

DOI: 10.1360/N972014-00450, PP. 322-327

Keywords: 燃烧反应,快速升温,共晶陶瓷,Al2O3/YAG,共晶结构

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Abstract:

Al2O3/Y3Al5O12(YAG)共晶陶瓷具有优异的热力学稳定性,被认为是超高温强氧化性环境下长期工作的候选材料之一.已报道的共晶陶瓷制备方法均依赖复杂的高温设备.本文采用了一种新的燃烧反应快速升温方法熔化和制备共晶陶瓷,具有升温速度快(可达2000℃/min)、温度高、冷却速率快、设备简单等特点.研究了利用该方法制备的Al2O3/YAG共晶陶瓷的微观结构和性能.结果表明制备的共晶陶瓷含有Al2O3和YAG相,两相耦合生长,相界面匹配良好,没有杂相存在;微观组织除具有典型的"象形文字(CS,Chinesescript)"结构外,还得到特殊的形貌,并分析了微观结构形成的机理.Al2O3/YAG共晶陶瓷硬度为20.52GPa,断裂韧性为2.64MPam1/2,裂纹以穿晶断裂方式扩展.共晶陶瓷经过1500℃处理20h后,样品无失重、也无明显结构变化,具有较好的高温结构稳定性.

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