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- Title
Effect of starting PMMA content on microstructure and properties of gel casting BN/SiN ceramics with spherical-shaped pore structures.
- Authors
Wang, Shengjin; Jia, Dechang; Cui, Wang; Yang, Zhihua; Duan, Xiaoming; Shao, Yingfeng; Zhou, Yu
- Abstract
By gel casting with polymethylmethacrylate microbeads (PMMA) as pore-forming agent, porous boron nitride/silicon nitride (BN/SiN) composite ceramics were successfully prepared. The obtained ceramic shows bimodal hierarchical structures that composed of spherical-shaped micro pores depending on PMMA content and irregular sub-micro pores formed by the stacking of ceramic particles. Porosity of the porous BN/SiN ceramics can be well controlled from 53.0 to 60.6 % by the PMMA content from 10 to 40 wt%, as well as the mechanical and dielectric properties. Effect of PMMA content on phase composition and the relationship between microstructure and the basic properties of the porous BN/SiN ceramics was discussed in detail. Microstructure analysis reveals that the sub-micro pores acted as channels between micro pores. BN particles have a relatively denser distribution on the wall of spherical-shaped micro pores with a window between micro and sub-micro pores, and resulting in a half-closed micro pore structure, which is meaningful for material design with concentration of BN particles on the wall of pore structure.
- Subjects
POLYMETHYLMETHACRYLATE; GELCASTING; SILICON nitride synthesis; BORON nitride synthesis; CERAMICS; MICROSTRUCTURE
- Publication
Journal of Materials Science, 2013, Vol 48, Issue 22, p7974
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-013-7608-y