期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 105, 期 8, 页码 5114-5130出版社
WILEY
DOI: 10.1111/jace.18503
关键词
camphene; directional properties; freeze casting; freeze front; lightweight material; porous ceramics; silica
资金
- Materials Characterization Facility at Carnegie Mellon University [MCF-677785]
This paper presents an experimental analysis of the freeze-casting process for fabricating porous ceramics. The effects of process parameters on porosity characteristics are evaluated using silica and camphene as the materials. Image processing is used to obtain the porosity characteristics, including areal porosity, pore size, pore shape, and pore orientation. The capability to steer the pore orientation is also demonstrated through bidirectional freezing experiments.
Porous ceramics offer unique properties that can bring advances to many application areas. The freeze-casting process has a strong potential for fabricating porous ceramics; however, the effects of process parameters on part porosity must be well understood for scalable manufacturing via freeze casting. This paper presents an experimental analysis of the freeze-casting process that correlates the freeze-casting parameters with pore characteristics. A full-factorial design of experiments is conducted on a unidirectional freeze-casting testbed using silica as the ceramic material and camphene as the solvent. The effects of solid loading, particle size, cooling temperature, and the distance from the cooling surface on porosity characteristics are evaluated. The fabricated samples are cross-sectioned vertically and horizontally and imaged using scanning electron microscopy. Image processing is used to obtain the porosity characteristics of areal porosity, pore size, pore shape, and pore orientation. The capability to steer the pore orientation is also demonstrated through bidirectional freezing experiments supported by a finite-element model. As a result, a quantitative understanding of the effects of freeze-casting process parameters on porosity characteristics is gained for the silica-camphene system. These results and the presented approach can be used for reproducible manufacture of porous ceramics with controlled porosity.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据