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- Title
Structure and Physicomechanical Properties of Porous Ceramic Based on Al<sub>2</sub>O<sub>3</sub> Prepared Using a Filtration Combustion Method.
- Authors
Ivanov, D. A.; Shlyapin, S. D.; Val’yano, G. E.; Fedorova, L. V.
- Abstract
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).
- Subjects
POROUS materials; CERAMICS; EXOTHERMIC reactions; ALUMINUM powder; SPHERULITES (Polymers); KAOLIN; THERMAL conductivity; THERMOCYCLING
- Publication
Refractories & Industrial Ceramics, 2018, Vol 58, Issue 5, p538
- ISSN
1083-4877
- Publication type
Article
- DOI
10.1007/s11148-018-0140-5