Porous Alumina-Zirconia Prepared by Foam Technique for Applications as Cooling Systems of Artificial Satellites
The interest in porous ceramics has increased concurrently with new processes and new applications. This material has been used in several industrial applications such as filters, catalysis and sensors. The objective of the present investigation was to produce porous alumina with 3 % mol yttria stabilized zirconia in tetragonal crystalline structure (Y-TZP). This material will be used in cooling systems of satellites, due to its mechanical properties and chemical inertia. To obtain the porous ceramics was used the direct foaming technique, which is a method based on the preparation of a stable foam slurry and a slurry of alumina and zirconia that are later mixed and blended for incorporation of air in the mixture. The sintered ceramics was characterized by scanning electronic microscopy, mercury porosimetry and permeability measurements. The porous Al2O3–ZrO2 ceramics obtained showed high porosity and uniform microstructure with 20–100 ,m open pores. The results from these alumina zirconia composites showed a potential to apply in heat pipes.
Lucio Salgado and Francisco Ambrozio Filho
A. C. O. Hirschmann et al., "Porous Alumina-Zirconia Prepared by Foam Technique for Applications as Cooling Systems of Artificial Satellites", Materials Science Forum, Vols. 591-593, pp. 865-869, 2008