Advertisement

Steel in Translation

, Volume 48, Issue 7, pp 411–418 | Cite as

SHS Technology for Composite Ferroalloys. 2. Synthesis of Ferrosilicon Nitride and Ferrotitanium Boride

  • M. Kh. Ziatdinov
  • I. M. Shatokhin
  • L. I. Leont’ev
Article
  • 2 Downloads

Abstract

The combustion of ferrosilicon in nitrogen is very similar to the combustion of metallic silicon. With increase in silicon content in the initial ferrosilicon, its reaction rate with nitrogen increases, as is clear from the considerably more vigorous combustion. The nitrogen concentration in the combustion products increases here. Over the whole range of initial parameters (nitrogen pressure, grain size of the powder, batch composition), the combustion products consist mainly of β-Si3N4. No large quantity of α-Si3N4 is observed. In practice, FS75 and FS90 ferrosilicon is optimal for refractory production, while FS65 and FS75 ferrosilicon, with lower impurity content, is best for the production of components used in steel production. The introduction of iron in the Ti–B system (Tad = 3190 K) considerably restricts the combustion concentration range. A mixture with 16.9% B burns in a narrow Ti:B concentration range close to 0.86. In combustion of the Fe–B + Ti mixture, increase in the initial temperature considerably expands the concentration range for synthesis. In all cases, increase in the initial temperature considerably boosts the combustion rate. Heating to T0 ≥ 300°C permits the use of mixtures with titanium powder containing larger grains (rme.Ti ≥ 0.4 mm) in self-propagating high-temperature synthesis (SHS). A wide range of B:Ti ratios may be used. The combustion of such mixtures permits the production of an alloy with 6–14% B and 30–60% Ti. Specialized industrial equipment has been constructed: a series of SHS reactors with working volumes of 0.06, 0.15, and 0.3 m3, permitting the large-scale production of materials based on refractory inorganic compounds for use in metallurgy. The industrial production of composites based on oxygen-free compounds by self-propagating hightemperature synthesis has been introduced.

Keywords

self-propagating high-temperature synthesis (SHS) composite ferroalloys nitrogen-bearing alloys nitrides borides filtrational combustion gas-free combustion thermally matched systems nitrided ferrovanadium nitrided ferrosilicon nitrided ferrochrome 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Iwamoto, S., UK Patent 1461119, 1977.Google Scholar
  2. 2.
    Hampshire, S., Silicon nitride ceramics—review of structure, processing and properties, J. Achiev. Mater. Manuf. Eng., 2007, vol. 24, no. 9, pp. 43–50.Google Scholar
  3. 3.
    Ziegler, G., Heinrich, J., and Wotting, G., Relationships between processing, microstructure and properties of dense and reaction-bonded silicon nitride, J. Mater. Sci., 1987, vol. 22, pp. 3041–3086.CrossRefGoogle Scholar
  4. 4.
    Mendendez-Martinez, J.J. and Dominguez-Rodrigez, A., Creep of silicon nitride, Prog. Mater. Sci., 2004, vol. 49, pp. 19–107.CrossRefGoogle Scholar
  5. 5.
    Tønseth, S., Dusty by—product yield hard cash, GEMINI, 1998, no. 1, pp. 1–4.Google Scholar
  6. 6.
    Kometani, K., Lizuka, K., and Kaga, T., Behavior of ferro-Si3N4 in taphole mud of blast furnace, Taikabutsu, 1998, vol. 50, no. 6, pp. 326–330.Google Scholar
  7. 7.
    Muroi, N., New taphole mud for blast furnaces, Taikabutsu, 1999, vol. 51, no. 4, pp. 192–196.Google Scholar
  8. 8.
    Lopes, A.B., The influence of ferro-silicon nitride on the performance of the modern taphole mud for blast furnace, Refract. Appl. News, 2002, vol. 7, no. 5, pp. 26–30.Google Scholar
  9. 9.
    Pant, P., Dahlmann, P., Schlump, W., and Stein, G., A new nitrogen alloying technique—a way to distinctly improve the properties of austenitic steel, Steel Res., 1987, no. 1, pp. 18–25.CrossRefGoogle Scholar
  10. 10.
    Mukas’yan, A.S., Martynenko, V.M., Merzhanov, A.G., Borovinskaya, I.P., and Blinov, M.Yu., Mechanism and principles of silicon combustion in nitrogen, Combust., Explos. Shock Waves (Engl. Transl.), 1986, vol. 22, no. 5, pp. 534–540.CrossRefGoogle Scholar
  11. 11.
    Mukas’yan, A.S., Stepanov, B.V., Gal’chenko, Yu.A., and Borovinskaya, I.P., Mechanism of structure formation of silicon nitride with combustion of silicon in nitrogen, Combust., Explos. Shock Waves (Engl. Transl.), 1990, vol. 26, no. 1, pp. 39–45.CrossRefGoogle Scholar
  12. 12.
    Hirao, K., Miyamoto, Y., and Koizumi, M., Combustion reaction characteristics in the nitridation of the silicon, Adv. Ceram. Mater., 1986, vol. 2, no. 4, pp. 780–785.CrossRefGoogle Scholar
  13. 13.
    Zakorzhevskii, V.V. and Borovinskaya, I.P., Some regularities of α-Si3N4 Synthesis in a commercial SHS reactor, Int. J. Self-Propag. High-Temp. Synth., 2000, vol. 9, no. 2, pp. 171–191.Google Scholar
  14. 14.
    Pavlov, S.V., Snitko, Yu.P., and Plyukhin, S.B., Wastes and emissions in production of ferrosilicon, Elektrometallurgiya, 2001, no. 4, pp. 22–28.Google Scholar
  15. 15.
    Boyer, S.M. and Moulson, A.J., A mechanism for the nitridation of Fe-contaminated silicon, J. Mater. Sci., 1978, vol. 13, pp. 1637–1646.CrossRefGoogle Scholar
  16. 16.
    Vlasova, M.V., Lavrenko, V.A., Dyubova, L.Yu., Gonzalez-Rodriguez, J.G., and Kakasey, M.G., Nitriding of ferrosilicon powders, J. Mater. Synth. Process., 2001, vol. 9, no. 3, pp. 111–117.CrossRefGoogle Scholar
  17. 17.
    Andrievski, R.A., Melting point and dissociation of silicon nitride, Int. J. Self-Propag. High-Temp. Synth., 1995, vol. 4, no. 3, pp. 237–244.Google Scholar
  18. 18.
    Messier, D.R., Riley, F.L., and Brook, R.J., The α/β silicon nitride phase transformation, J. Mater. Sci., 1978, vol. 13, pp. 1199–1205.CrossRefGoogle Scholar
  19. 19.
    Ziatdinov, M.Kh. and Shatokhin, I.M., Self-propagating high-temperature synthesis of ferrosilicon nitride, Steel Transl., 2008, vol. 38, no. 1, pp. 39–44.CrossRefGoogle Scholar
  20. 20.
    Ziatdinov, M.Kh. and Shatokhin, I.M., Experience in the development, production, and use of self-propagating high-temperature synthesis materials in metallurgy, Metallurgist, 2008, vol. 52, no. 11–12.Google Scholar
  21. 21.
    Ziatdinov, M.Kh. and Shatokhin, I.M., Using ferrosilicon nitride of nitro-fesil grade in gate and spout components, Refract. Ind. Ceram., 2008, vol. 49, no. 5, pp. 383–387.CrossRefGoogle Scholar
  22. 22.
    Digges, T.G., Irish, C.R., and Carwile, N.L., Effect of boron on the hardenability of high-purity alloys and commercial steels, J. Res. Natl. Bur. Stand., 1948, vol. 41, pp. 127–143.CrossRefGoogle Scholar
  23. 23.
    Lyakishev, N.P., Pliner, Yu.L., and Lappo, S.I., Borsoderzhashchie stali i splavy (Boron-Containing Steels and Alloys), Moscow: Metallurgiya, 1986.Google Scholar
  24. 24.
    Ziatdinov, M.Kh., Maximov, Y.M., and Merzhanov, A.G., CN Patent 1071968, CN Patent 2681877, 1993.Google Scholar
  25. 25.
    Tugutov, A.V., Ziatdinov, M.Kh., and Maksimov, Yu.M., USSR Inventor’s Certificate no. 1830393, Byull. Izobret., 1993, no. 28.Google Scholar

Copyright information

© Allerton Press, Inc. 2018

Authors and Affiliations

  • M. Kh. Ziatdinov
    • 1
  • I. M. Shatokhin
    • 2
  • L. I. Leont’ev
    • 3
    • 4
    • 5
  1. 1.Tomsk State UniversityTomskRussia
  2. 2.OOO NTPF EtalonMagnitogorskRussia
  3. 3.Baikov Institute of Metallurgy and Materials ScienceRussian Academy of SciencesMoscowRussia
  4. 4.Presidium of the Russian Academy of SciencesMoscowRussia
  5. 5.Moscow Institute of Steel and AlloysMoscowRussia

Personalised recommendations