Atechnological approach is proposed making it possible to prepare highly porous ceramic based on Al2O3 using a method of filtration combustion (FC). The method is based on an exothermic oxidation reaction (in an FC regime) of aluminum powder PAP-2 particles mixed with spherulites of commercial alumina (type 1 material) or kaolin fibers (type 2 material). Depending on the volume faction of PAP-2 open porosity for sintered type 1 material is from 38 to 50%, and ultimate strength in bending is from 10 to 50 MPa. Good material thermal shock resistance, evaluated from the relative loss of crack resistance after thermal cycling by a regime of heating to 850°C and cooling in an air stream (18°C), comprises 12 – 15% and is unchanged after five successive thermal cycles. Material of type 2 is an ultra-lightweight heat insulator with density of 0.25 – 0.50 g/cm3. The bearing strength is 0.10 – 0.15 MPa, and thermal conductivity in the range 20 to 1000°C is 0.06 – 0.17 W/(m·K).
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Research was carried out within the scope of the main part of a state assignment to higher education establishments No. 11.7568.2017/B4 using equipment of the collective use resource center “Aerospace materials and technology” MAI.
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Translated from Novye Ogneupory, No. 9, pp. 40 – 43, September, 2017.
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Ivanov, D.A., Shlyapin, S.D., Val’yano, G.E. et al. Structure and Physicomechanical Properties of Porous Ceramic Based on Al2O3 Prepared Using a Filtration Combustion Method. Refract Ind Ceram 58, 538–541 (2018). https://doi.org/10.1007/s11148-018-0140-5
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DOI: https://doi.org/10.1007/s11148-018-0140-5