ZrO2 foams for porous radiant burners

• Published in: Journal of materials science Vol. 44; no. 13; pp. 3466 - 3471
• Main Authors: Gómez, Sergio Yesid, Escobar, J. A., Alvarez, O. A., Rambo, C. R., de Oliveira, A. P. Novaes, Hotza, D.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.07.2009; Springer Nature B.V
• Subjects: Additives; Cellular structure; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Density; Foams; Heat treatment; Materials Science; Plastic foam; Polymer Sciences; Polyurethane foam; Raw materials; Sintering (powder metallurgy); Solid Mechanics; Structural analysis; Structural integrity; Yttria stabilized zirconia; Yttrium oxide; Zirconium dioxide; Ceramic Foam; Foam; Ceramic Structure; Equivalence Ratio; Polyurethane Foam
• DOI: 10.1007/s10853-009-3462-3
• ISSN: 0022-2461

In this work, Y 2 O 3 -stabilized ZrO 2 (YSZ) foams with low relative density were developed through the replication method, for application as porous radiant burners. The ceramic foams were produced by impregnation of open-cell polyurethane foams with aqueous suspensions and different fractions of raw materials: ZrO 2 –8% Y 2 O 3 (8YSZ) powder, and additives. The materials were milled for 10–40 min. The impregnated foams were dried and submitted to a heat treatment for polyurethane elimination at 1000 °C for 1 h, with subsequent sintering of the remaining ceramic structure at 1600 °C for 2 h, which resulted in YSZ foams with low relative density (0.07). The structural analysis revealed a cellular structure with an average mechanical strength of 95.6 kPa. The radiation efficiency (>19%) was obtained by tests with different air/fuel ratio. The ceramic matrixes exhibited high performance and structural integrity at high operation temperatures (1400 °C).