Properties and Processing of Porous Si₃N₄ Ceramics

Abstract:

Porous silicon nitride (Si₃N₄) ceramics green were prepared by sol-gel and freeze drying processing. Al₂O₃ and MgO were selected as sintering additives. Porous Si₃N₄ ceramics were sintered at 1200~1300 °C. The porosity of porous Si₃N₄ ceramics reached 60~80%, the pore size of porous Si₃N₄ ceramics dried by freeze drying is less than 5μm. Two kinds of pores were formed, including open pores with pore size of 1~5μm and closed pores pore size with the nanometer level. The compression strength of porous Si₃N₄ ceramics was 15~25MPa. Thermal conductivity of porous Si₃N₄ ceramics was 0.08-0.1 W/m·K.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 375-379
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.375
• Online since: March 2014
• Authors: Xiao Tong Zhao*, Hai Long Wang, Wei Shang, Jian Bao Chen, Hong Liang Xu, Hong Xia Lu, De Liang Chen, Bing Bing Fan, Rui Zhang
• Keywords: Freeze-Drying Processing, Porosity, Porous Silicon Nitride, Sol-Gel, Thermal Conductivity (TC)

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