Porous Si3N4 Ceramics Prepared by TBA-based Gel-casting

doi:10.1016/j.jmst.2014.01.016

J. Mater. Sci. Technol. ›› 2015, Vol. 31 ›› Issue (3): 295-299.DOI: 10.1016/j.jmst.2014.01.016

• Orginal Article • Previous Articles Next Articles

Porous Si₃N₄ Ceramics Prepared by TBA-based Gel-casting

Liuyuan Li^{1, *}, Hongjie Wang², Shaochang Su²

1 China Aviation Powerplant Research Institute, Zhuzhou 412002, China; 2 State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China

Received:2013-10-08 Online:2015-03-20 Published:2015-07-23
Contact: Corresponding author. Tel.: +86 731 28592571; Fax: +86 731 22571142. E-mail address: liuyuanwuming@163.com (L. Li).
Supported by:
This work was supported by the National Natural Science Foundation of China (No. 90816018) and Program of Shaanxi Bureau of Foreign Expert Affairs (No. 2011-32).

Abstract

Abstract: In this work, the effects of ratio of monomer to cross-linker (AM/MBAM) and solid loading on the microstructure and mechanical properties of porous Si₃N₄ ceramics prepared by tert-butyl alcohol (TBA)-based gel-casting process were investigated. It was found that, when the ratio of monomer to cross-linker was 8, and the solid loading was 50 wt%, the mechanical properties of sintered samples were the most excellent, which resulted from the uniform pore size distribution and well-grown rod-like β-Si₃N₄ grains. In that case, the porosity and flexural strength of sintered samples were 50% and 125 MPa, respectively.

Key words: Ratio of monomer to cross-linker, Solid loading, Porous Si3N4 ceramics, TBA-based gel-casing

Liuyuan Li, Hongjie Wang, Shaochang Su. Porous Si₃N₄ Ceramics Prepared by TBA-based Gel-casting[J]. J. Mater. Sci. Technol., 2015, 31(3): 295-299.

Figures/Tables 6

Influences of ratios of monomers on porosity and flexural strength.

XRD pattern of sample after sintering.

Fracture morphology of porous Si3N4 with different ratio of monomers: (a) 2:1, (b) 4:1, (c) 8:1, (d) 16:1.

Pore diameter distribution of samples with different ratio of monomers: (a) 4:1, (b) 8:1, (c) 16:1.

Influence of solid loading on flexural strength and porosity of porous Si3N4 ceramics.

Microstructure of porous Si3N4 ceramics of different solid loading: (a) 20%, (b) 30%, (c) 40%, (d) 50%, (e) 60%.

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Porous Si₃N₄ Ceramics Prepared by TBA-based Gel-casting

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