Effect of Process Conditions on the Microstructure of Particle-Stabilized Al2O3 Foam
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Al2O3 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, Al2O3 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 Al2O3 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 Al2O3 foam with open and closed-cell structure, cell size ranging from 20 μm to 300 μm having single strut wall and porosity from 75% to 93% were successfully fabricated by sintering at 1600oC for 2 h in air.
Abstract
Al2O3 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, Al2O3 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 Al2O3 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 Al2O3 foam with open and closed-cell structure, cell size ranging from 20 μm to 300 μm having single strut wall and porosity from 75% to 93% were successfully fabricated by sintering at 1600oC for 2 h in air.
참고문헌 (14)
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