ZrO2 foams for porous radiant burners
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In this work, Y2O3-stabilized ZrO2 (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: ZrO2–8% Y2O3 (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).
KeywordsFoam Equivalence Ratio Polyurethane Foam Ceramic Structure Ceramic Foam
The authors are grateful to Capes and CNPq/Brazil for funding this work. The authors are equally grateful to labCET (UFSC) for their collaboration with the porous burner’s test.
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