Obrabotka Metallov. 2016 no. 2(71)

ОБРАБОТКА МЕТАЛЛОВ № 2 (71) 2016 57 МАТЕРИАЛОВЕДЕНИЕ Abstract The highly permeable cellular material (HPCM) based on chromal is promising as a carrier of deep methane oxidation catalysts. Using HPCM as a base material of heat-resistant Fe-Cr-Al alloys allows to apply such catalysts at temperatures up to 900 °C in the air and in the combustion gas atmosphere. HPCM-chromal is the basis for flameless combustion of methane catalysts for environmental friendly heat generators. HPCM based on Fe-Cr-Al is used as the heat and power unit the catalytic reactor-steam generator, allowing performing deep flameless oxidation of the fuel in the reactor at temperatures below 1000 °C, which virtually eliminates the formation of oxides of nitrogen NOx and CO. HPCM based on Fe-Cr-Al is obtained by powder metallurgy by replicating the spatial structure of polymeric cellular material. The materials are prepared from the slurry based on the mixture of carbonyl iron powder and master alloy (wt.%) 20 % Fe-60 % Cr-20 % Al with the addition of 1.5% Co fine powder. Technique involves ligature milling, powders mixing, preparation and application to polymer backbone slurry, preliminary annealing in hydrogen, with a step by heating to 700°C for decomposition and removal of the polymer and the final sintering in vacuum at 1270 °C. The results of X-ray study highly porous cellular material of Fe-Cr-Al are showed. The data on the phase composition, the lattice parameters and the fine structure of the starting powder and the charge is showed. Material is investigated after intermediate annealing at 700 °C and after sintering at 1270 °C. After intermediate annealing at 700° material consists of 3 bcc phases with differing parameters. After the final sintering material consists of a bcc phase and impurities of chromium carbide Cr 7 C 3 . Keywords highly porous cellular materials, Fe-Cr-Al, flameless combustion of methane DOI: 10.17212/1994-6309-2016-2-51-58 References 1. Antsiferov V.N., Khramtsov V.D., Polivoda A.I., Volkov E.P., Tsoi G.A., Bevz A.P. Vysokoporistye pronitsae- mye yacheistye materialy dlya ekologicheski bezopasnykh teplogeneratorov [The highly porous breathable cellular material for environmentally friendly heat generators]. Perspektivnye materialy – Journal of Advanced Materials , 2008, no. 6, pp. 5–10. (In Russian) 2. Antsiferov V.N., Tsoi G.A., Bevz A.P., Polivoda A.I. Teplovydelyayushchie kataliticheskie bloki besplamenno- go goreniya na osnove zharostoikogo splava [The fuel catalyst units for flameless combustion based on heat-resistant alloy]. Tekhnologiya metallov – Metal Technology , 2010, no. 8, pp. 25–32. 3. Tierney C., Harris A.T. Materials design and selection issues in ultra-lean porous burners. Journal of the Aus- tralian Ceramic Society , 2009, vol. 45 (2), pp. 20–29. 4. Sadykov V.A. Structured nanocomposite catalysts of biofuels transformation into syngas and hydrogen: de- sign and performance. Second International Conference “Catalysis for renewable sources: fuel, energy, chemicals” CRS-2: abstracts , Lund, Sweden, 22–28 July 2013, pp. 12–13. 5. Verlato E., Barison S., Cimino S., Dergal F., Lisi L., Mancino G., Musiani M., Vazquez-Gomez L. Catalytic partial oxidation of methane over nanosized Rh supported on Fecralloy foams. International Journal of Hydrogen Energy , 2014, vol. 39, iss. 22, pp. 11473– 11485. doi: 10.1016/j.ijhydene.2014.05.076 6. Solnyshkov I.V., Porozova S.E. Kataliticheskaya aktivnost’ vysokoporistogo materiala na osnove splava khro- mal’ v reaktsii glubokogo okisleniya metana [Catalytic activity highly porous material based on an Fe-Cr-Al alloy in deep oxidation of methane]. Sovremennye problemy nauki i obrazovaniya – Modern problems of science and educa- tion , 2014, no. 6, p. 105. 7. Antsiferov V.N., Ovchinnikova V.I., Porozova S.E., Fedorova I.V. Vysokoporistye yacheistye keramicheskie materialy [Highly porous cellular ceramic materials]. Steklo i keramika – Glass and Ceramics , 1986, no. 9, p. 19. (In Russian) 8. Walther G., Klöden B., Kieback B., Poss R., Bienvenu Y., Bartout J.-D. A new PM process for manufacturing of alloyed foams for high temperature applications. World PM2010 Proceedings , 2010, vol. 4, pp. 109–116. 9. Quadbeck P., Kümmel K., Hauser R., Standke G., Adler J., Stephani G. Open cell metal foams – application- oriented structure and material selection. Proceedings of the International Conference on Cellular Materials “CELL- MAT 2010” , Dresden, Germany, 27–29 October 2010, pp. 279–288. 10. Naumenko D., Le-Coze J., Wessel E., Fischer W., Quadakkers W.J. Effect of trace amounts of carbon and nitrogen on the high temperature oxidation resistance of high purity FeCrAl alloys. Materials Transactions , 2002, vol. 43, no. 2, pp. 168–172.