Anisotropic properties of highly textured porous alumina formed from platelets

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• 作者：Sawao Honda ; Shinobu Hashimoto ; ^{hashimoto.shinobu@nitech.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Syuya Iwata ; Yuji Iwamoto
• 关键词：B. Platelets ; C. Thermal conductivity ; Porous alumina ; Bending strength ; Orientation
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：1453-1458
• 全文大小：1527 K

文摘

Alumina platelets and a pulsed electric current sintering (PECS) technique were used to form porous alumina with highly oriented grains in one direction. A slurry consisting of alumina platelets, distilled water, and organic binders was spread over a gypsum board to form a green sheet. Pellets 14 mm in diameter were punched from the sheet and preheated at 800 °C to burn off the binders. The preheated pellets were placed in a carbon die, which was then positioned within the PECS device. After heating at 1400 °C and 30 MPa for 5 min, porous alumina with 80.8% density was obtained. Parallel to the pressing direction, the thermal conductivity and bending strength of the porous body were 22.4 W m⁻¹ K⁻¹ and 404 MPa, respectively. Perpendicular to the pressing direction, on the other hand, the thermal conductivity and bending strength of the porous body were 10.8 W m⁻¹ K⁻¹ and 217 MPa, respectively.