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楔形角度和分散剂对双向冷冻法制备仿生层状陶瓷显微结构的影响
作者: 杰1  2 宋俊杰1 樊恒中1 苏云峰1 张永胜1 胡丽天1 
单位:(1. 中国科学院兰州化学物理研究所 固体润滑国家重点实验室 兰州 730000 2. 中国科学院大学材料与光电研究中心 北京 100049) 
关键词:氧化铝 仿生层状结构 双向冷冻铸造 楔形角度 分散剂 
分类号:TQ174.75
出版年,卷(期):页码:2019,47(12):0-0
DOI:
摘要:

 采用双向冷冻铸造技术制备仿生层状氧化铝陶瓷骨架,考察了楔形角度和分散剂对层片取向、层间距及层间矿物桥的影响,并通过陶瓷骨架显微结构分析探讨了二者对层片生长的作用机理。结果表明:通过改变楔形角度可以调控冷冻铸造中横向温度梯度,进而实现陶瓷层片的有序生长;此外,通过引入分散剂改善陶瓷浆料的流动性,能够进一步提高陶瓷层片的有序性,并有助于层间连通矿物桥的生成。当楔形角度为20°时,可以获得长程有序的仿生层状氧化铝陶瓷骨架,并且分散剂的加入使陶瓷骨架的总气孔率略微增大

  The bio-inspired layered alumina scaffolds were prepared by a bidirectional freezing cast technology. The influences of wedge angle and dispersant on the lamellar orientation, lamellae spacing and interlamellar mineral bridges were investigated, and the growth mechanism of layers was revealed via analyzing the microstructures of ceramic scaffolds. The results show that horizontal temperature gradient can be regulated by the adjustment of the wedge angle, thereby achieving the directed growth of ceramic layer. In addition, adding a dispersant into the slurries to enhance the fluidity of slurries can further improve the order of ceramic layers and promote the formation of interlamellar mineral bridges. The bio-inspired layered alumina ceramic scaffolds in a long-range order can be obtained when the wedge angle is 20°, and the addition of dispersant slightly increases the total porosity of ceramic scaffolds.

基金项目:
国家自然科学基金(51775534)资助。
作者简介:
参考文献:

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