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材料工程  2015 

凝胶注模空心叶片氧化铝基陶瓷铸型的中温强度

DOI: 10.11868/j.issn.1001-4381.2015.04.001, PP. 1-7

Keywords: 凝胶注模,空心叶片,陶瓷铸型,中温强度,黏结剂

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Abstract:

使用聚酰亚胺和磷酸铝作为黏结剂,基于三点抗弯强度测试、热重-差热分析、X射线衍射和扫描电镜分析,研究含黏结剂标准试样的抗弯强度、热失重行为、预烧后的物相变化以及显微结构。结果表明500℃之前,聚酰亚胺通过熔融交联对氧化铝等陶瓷颗粒产生黏结作用,坯体300℃强度由3MPa提高到5MPa以上;升温至约500℃(升温速率为30℃/h),聚酰亚胺基本烧失,对氧化铝基陶瓷铸型增强作用消失。三种磷酸铝(正磷酸铝、偏磷酸铝、磷酸二氢铝)可分别将坯体500℃的"零强度"提高至0.2,0.2MPa和0.8MPa。通过浸渍磷酸二氢铝,成功制备无断芯和偏芯缺陷的空心涡轮叶片一体式陶瓷铸型。

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