Effect of Process Conditions on the Microstructure of Particle-Stabilized Al<sub>2</sub>O<sub>3</sub> Foam

Rizwan Ahmad; Jang-Hoon Ha; Yoo-Dong Hahn; In-Hyuck Song

doi:10.4150/KPMI.2012.19.4.278

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Effect of Process Conditions on the Microstructure of Particle-Stabilized Al₂O₃ Foam: Rizwan Ahmad, Jang-Hoon Ha, Yoo-Dong Hahn, In-Hyuck Song; Journal of Korean Powder Metallurgy Institute 2012;19(4):278-284
DOI: https://doi.org/10.4150/KPMI.2012.19.4.278

¹Engineering Ceramics Department, Korea Institute of Materials Science
²Engineering Ceramics Department, Korea Institute of Materials Science
³Engineering Ceramics Department, Korea Institute of Materials Science
⁴Engineering Ceramics Department, Korea Institute of Materials Science

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Abstract

Al_2O_3 foam is an important engineering material because of its exceptional high-temperature stability, low thermal conductivity, good wear resistance, and stability in hostile chemical environment. In this work, Al_2O_3 foams were designed to control the microstructure, porosity, and cell size by varying different parameters such as the amount of amphiphile, solid loading, and stirring speed. Particle stabilized direct foaming technique was used and the Al_2O_3 particles were partially hydrophobized upon the adsorption of valeric acid on particles surface. The foam stability was drastically improved when these particles were irreversibly adsorbed at the air/water interface. However, there is still considerable ambiguity with regard to the effect of process parameters on the microstructure of particle-stabilized foam. In this study, the Al_2O_3 foam with open and closed-cell structure, cell size ranging from 20µm to 300µm having single strut wall and porosity from 75% to 93% were successfully fabricated by sintering at 1600°C for 2 h in air.

Keywords: Colloidal processing;Al_2O_3 foam;Particle-stabilized direct foaming;Porous ceramics;

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