Preparation of high porous silicon nitride foams with ultra-thin walls and excellent mechanical performance for heat exchanger application by using a protein foaming method

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• 作者：Liuyan Yin ; ^{hanqing421720@sina.com" class="auth_mail" title="E-mail the corresponding author} ; Xingui Zhou ; Jinshan Yu ; Honglei Wang
• 关键词：B. Porosity ; C. Thermal conductivity ; D. Si3N4 ; E. Heat exchangers
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：1713-1719
• 全文大小：1086 K

文摘

Ceramic foam with excellent mechanical performance, high thermal conductivity and high surface area-to-volume ratio is thought to have great potential in heat exchanger application. In this study, silicon nitride (Si₃N₄) foams with ultrathin cell walls were prepared by using a protein foaming method via increasing the air fraction of foamed slurry. Cell thickness of these Si₃N₄ foams was only 2–3 µm and the pores in the Si₃N₄ foams fabricated here exhibited polyhedral shapes. Thermal conductivities of these Si₃N₄ foams ranged from 2.427 W m⁻¹ K⁻¹ to 3.154 W m⁻¹ K⁻¹, whereas compressive strengths of these Si₃N₄ foams are in the range from 12.85 MPa to 19.99 MPa. Moreover, compressive load–displacement curves of the Si₃N₄ foams generally exhibit cellular behavior.