Article

Article title FEATURES OF SYNTHESYS OF NANOCOMPOSITES Al2O3+хFe
Authors O.V. Karban, E.I. Salamatov, G.N. Konygin, O.Yu. Goncharov, F.Z. Gilmutdinov
Section SECTION I. ELECTRONICS AND NANOTECHNOLOGY
Month, Year 10, 2016 @en
Index UDC 546.621/623:17
DOI 10.18522/2311-3103-2016-10-4052
Abstract Powder compaction method used for synthesys of thermocrystals provides control of the structure formation process, grain and pore size, it permits to realize the required material struc-ture which forms the gap on phonon spectrum. Proposed is the new method of creation of thermocrystals based on the composites Al2O3+хFe, it permits to preserve the nano-disperse structure of material in absence of spinel phase in interface areas. The process involves a mixture of aluminium oxide mechanoactivation powders and pre mehanosynthesized nanocrystalline iron carbide followed by compaction and sintering. The cementite reduction followed by decomposition of iron and formation of metal particles in a ceramic matrix during the sintering process inhibits the formation of a spinel phase. The homogeneous powders were obtained by mechanical activation of the mixture of aluminium oxide and nano-crystal Fe3C. The homogeneous structure of the powder formed in the process of mechanical activation contributes to the consolidation of a metal grains and ceramic. Finishing structure and phase composition of the composites are determined by compaction. Application of methods of magnetic-impulse pressing (MIP) and uniaxial dry pressing with ultrasonic exposure (US) allows us to obtain the compacts with apparent density 0,5–0,65 without any change in the phase composition of compacts. The composition and size of metal particles are determined by the method and conditions of compacting. For the MIP-samples, decomposition of cementite is observed during sintering, resulting in iron reduction and formation of -iron metal particles in ceramic matrix. For US-samples, particles of irregular solid solution Fe-Al are formed. It was shown that unlike sintering of Al2O3+хFe, if content of Fe3C in initial mechanical mix of powders is more than 5% the spinel phase is not generated during sintering.

Download PDF

Keywords Thermocrystals, composites Al2O3+хFe, nanoceramics.
References 1. Maldovan M. Thermal Energy Transport Model for Micro-toNanograin Polycrystalline Semi-conductors, Journal of Applied Physics, 2011, Vol. 110, pp. 114310.
2. Maldovan M. Thermal Conductivity of Semiconductor Nanowires from Micro-to-Nano Length Scales, Journal of Applied Physics, 2012, Vol. 111, pp. 024311.
3. Maldovan M. Narrow Low-Frequency Spectrum and Heat Management by Thermocrystals, Phys. Rev. Lett., 2013, Vol. 110, pp.025902.
4. Ivanov V.V. [et al.] Resonant scattering of nonequilibrium phonons (λph = 10–50 nm) in nanostructured ceramics based on YSZ + Al2O3 composites, JETP, 2008, Vol. 106, pp. 288-295.
5. Salamatov E.I., Khazanov E.N., Taranov A.V. Phononic band gap structures based on com-pacted nanoceramics, Journal of Applied Physics, 2013, Vol. 114, pp. 154305.
6. Karban' O.V. [i dr.]. Issledovanie osobennostey kinetiki teplovykh fononov i struktury nanodispersnykh zhelezosoderzhashchikh kermetov na osnove korunda v oblasti Hetemperatur [Study of the kinetics of thermal phonons and structure in nano-disperse iron-containing cermet based on corundum in the field of Attemperator], Zhurnal eksperimental'noy i teoreticheskoy fiziki [Journal of experimental and theoretical physics], 2009, Vol. 135, No. 4, pp. 758-765.
7. Abramovich A.A. [i dr.]. Vliyanie struktury na teploprovodnost' nanokompozita Al2O3 +Fe [Influence of structure on conductivity of nanocomposite Al2O3 +Fe], Fizika i khimiya stekla [Physics and chemistry of glass], 2005, Vol. 31, No. 4, pp. 764-767.
8. Guichard J.L., Tillement O., Mocellin A. Preparation and characterization of alumina-iron cermets by hot-pressing of nanocomposite powder, Journal of Materials Science, 1997,
Vol. 32, pp. 4513-4521.
9. Schicker S. [et al.]. Microstructure and Mechanical Properties of Al-assisted Sintered Fe/Al2O3 Cermets, J. Eur. Ceram. Soc., 1999, Vol. 19, pp. 2455-2463R.
10. Nagel R., Balogh A.G. On the behavior of enhanced mixing in metal/ceramic interfaces, Nuclear Instruments and Methods in Physics Research B, 2001, Vol. 175-177, pp. 398-402.
11. Goncharov O.Yu., Karban' O.V., Nemtsova O.M., Il'in I.A. Analiz protsessa formirovaniya nanokompozitov Al2O3 + Fe [Analysis of the process of formation of nanocomposite Al2O3 + Fe ], Fizika i khimiya stekla [Physics and chemistry of glass], 2009, Vol. 35, No. 2, pp. 210-218.
12. Vorob'ev Yu.P. Defekty lazernykh kristallov i magnitnoy keramiki [Defects in laser crystals and magnetic ceramics]. Ekaterinburg: UrO RAN, 2006, 594 p.
13. Ivanov V.V. [i dr.]. Effektivnost' dinamicheskogo metoda uplotneniya nanorazmernykh poroshkov [The effectiveness of the dynamic method of sealing nanosized powders], Materialovedenie [Materialovedenie], 1997, No. 5, pp. 49-55.
14. Khasanov O.L., Dvilis E.S. Net-shaping nanopowders with powerful ultrasonic action and methods of the density distribution control, Advances in Applied Ceramics, 2008, Vol. 107, No. 3, pp. 135-141.
15. Vatolin N.A., Moiseev G.K., Trusov B.G. Termodinamicheskoe modelirovanie v vysokotemperaturnykh neorganicheskikh sistemakh [Thermodynamic modeling in high tem-perature inorganic systems]. Moscow: Metallurgiya, 1994, 352 p.
16. Karban' O.V. [i dr.]. Struktura i teplofizicheskie svoystva kermetov (Al2O3 +xFe) [Structure and thermal properties of the cermet (Al2O3 +xFe)], Sbornik nauchnykh trudov VII Vserossiyskoy konferentsii «Fizikokhimiya ul'tradispersnykh (nano-) sistem» [Collection of scientific works of the VII all-Russian conference "physical chemistry of ultrafine (nano-) sys-tems"]. Moscow: MIFI, 2006, pp. 178-182.
17. Chesnokov V.V., Buyanov R.A. Obrazovanie uglerodnykh nitey pri kataliticheskom razlozhenii uglevodorodov na metallakh podgruppy zheleza i ikh splavakh [The formation of carbon filaments upon catalytic decomposition of hydrocarbons on iron subgroup metals and their alloys], Uspekhi khimii [Progress in chemistry], 2000, Vol. 69, No. 7, pp. 675-692.
18. Strohmeier B.R., Leyden D.E., Field R.S. Hercules D.M.Surface spectroscopic characterization of Cu/Al2O3 catalysts, Journal of Catalysis, 1985, Vol. 94, pp. 514-530.
19. Lindsa J.R. [et al.]. X-ray Photoelectron Spectra of Aluminum Oxides: Structural Effects on the “Chemical Shift”, Applied Spectroscopy, 1973, Vol. 27, I.1, pp. 1-5.
20. Mani B., Sitakara V. Rao, Maiti H.S. X-ray and electrical conductivity studies on iron-aluminium mixed oxides, J. of Mater. Sci., 1980, Vol. 15, pp. 925-930.
21. Williams G., Coles G.S.V., Ferkel H., Riehmann W. The use of nano-crystalline oxides as gas sensing materials, Inter. Confer. on Solid-State Sensors and Actuators, Cchcago, June 16-19, 1997, pp. 551-554.
22. Karban O.V., Ivanov S.N., Kazanov E.N., Salamatov E.I. Effect of sintering condition on the grain size and phase composition distributions of titanium dioxide nanoceramics, Physics of Low-Dimensional Structure, 2004, No. 1/2, pp. 25-34.
23. Ivanov V.V. [i dr.]. Osobennosti sinteza keramik na osnove -oksida alyuminiya s submikronnoy strukturoy, legirovannogo magniem i titanom [Features of the synthesis of ce-ramics based on -alumina with submicron structure, doped with magnesium and titanium], Neorganicheskie materialy [Inorganic materials], 2001, Vol. 37, No. 2, pp. 248-256.
24. Karban' O.V. [i dr.]. ASM-issledovanie nanokeramike Al2O3 spechennykh pri razlichnykh temperaturakh [AFM-study of the nano Al2O3 sintered at different temperatures], Fizikokhimiya ul'tradispersnykh sistem: Sbornik nauchnykh trudov 5-y Vserossiyskoy konferentsii [Physicochemistry of ultradisperse systems: Collection of scientific works of the 5th all-Russian conference]. Part II. Ekaterinburg: UrO RAN, 2001, pp. 128-132.
25. Gaffet E. [et al.]. Some Recent Developments in Mechanical Activation and Mechanosynthesis, J. Mater. Chem., 1999, Vol. 9, pp. 305-314.
26. Karban O.V. [et al.]. Effect of ultrasonic vibration on the structure and composition of the inter-face regions in Ba–W–Ti–O ceramics, Ceramics International, 2013, Vol. 39, pp. 497-502.

Comments are closed.