Pressureless Sintering of Silicon Nitride Porous Ceramics with High Porosity and Bimodal Pore Structure


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In this paper, silicon nitride porous ceramics with high porosity and bimodal pore structure were prepared using pressureless sintering at 900~1100°C. In these porous ceramics, zirconium phosphate (ZrP2O7) was used as a binder and starch and naphthalene powders were used as pore forming agents. The obtained results showed that the porosity could be controlled in the range of 34 % to 70 % by changing the content of pore forming agents. The pores were formed by the continuous reaction of ZrP2O7 at ~250 °C and burnout of starch at ~550 °C (when starch was used as a pore forming agent), or sublimation of naphthalene at 80°C (when naphthalene was used as a pore forming agent). The bimodal pore structure was produced with pore size of less than 0.5m and ~10 m when using starch as a pore forming agent and the pore size of less than 0.5m and ~30μm when using naphthalene as a pore forming agent.



Key Engineering Materials (Volumes 512-515)

Edited by:

Wei Pan and Jianghong Gong




F. Chen et al., "Pressureless Sintering of Silicon Nitride Porous Ceramics with High Porosity and Bimodal Pore Structure", Key Engineering Materials, Vols. 512-515, pp. 873-877, 2012

Online since:

June 2012




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