Structure and Physicomechanical Properties of Porous Ceramic Based on Al2O3 Prepared Using a Filtration Combustion Method


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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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D. Ivanov

Moscow Aviation Institute (National Research University)

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Email: dali_888@mail.ru
俄罗斯联邦, Moscow

S. Shlyapin

Moscow Aviation Institute (National Research University)

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俄罗斯联邦, Moscow

G. Val’yano

FGBUN Russian Academy of Sciences Joint Institute of High temperatures

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俄罗斯联邦, Moscow

L. Fedorova

Moscow Aviation Institute (National Research University)

Email: dali_888@mail.ru
俄罗斯联邦, Moscow

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