Hostname: page-component-848d4c4894-xm8r8 Total loading time: 0 Render date: 2024-07-02T09:56:22.719Z Has data issue: false hasContentIssue false
  • English
  • Français

Reaction path in the magnesium thermite reaction to synthesize titanium diboride

Published online by Cambridge University Press:  31 January 2011

V. Sundaram ,
K. V. Logan  and
R. F. Speyer
V. Sundaram
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332–0245
K. V. Logan
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332–0245
R. F. Speyer
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332–0245
Get access

Abstract

TiB2, along with MgO and Mg3B2O6, was formed by a thermite reaction between Mg, amorphous B2O3, and TiO2 powders in argon. The mixture 5Mg–TiO2–B2O3 along with binary mixtures and single components were analyzed using differential thermal analysis (DTA) and x-ray diffraction (XRD). Large (25 g) specimens were also ignited in bulk using a resistance-heated nichrome wire. The reaction path in forming TiB2 in the three component mixture was deduced. Mg reduces TiO2 and B2O3 to form Ti and MgB2, respectively, which in turn react to form TiB2. In an oxidizing atmosphere, the significant speed of the reaction permitted solid state reaction to form TiB2 before atmospheric oxygen could diffuse into the powder mass and react to form oxide phases. Thermite reactions in air have the advantage (over furnace heating in air) of not providing time at elevated temperatures for Mg and intermediate products to become consumed in the formation of oxides, nor time for oxidation degradation of TiB2.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 10 , October 1997 , pp. 2657 - 2664
Copyright
Copyright © Materials Research Society 1997

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Logan, K. V., Ph.D. Thesis, Georgia Institute of Technology (1992).Google Scholar
2.Samsonov, G. V.et al.: Publishing House of the Academy of Sciences Ukrainian SSR, Kiev (1960), pp. 388–393.Google Scholar
3.Jiang, Z. and Rhine, W. E., J. European Ceram. Soc. 12 (5), 403–411 (1993).CrossRefGoogle Scholar
4.Elders, J. and van Voorst, J. D. W., Appl. Surf. Sci. 69 (1–4), 267–271 (1993).CrossRefGoogle Scholar
5.Wang, W. L., Munir, Z. A., and Maximov, Y. M., J. Mater. Sci. 28 (14), 3693–3708 (1993).CrossRefGoogle Scholar
6.Logan, K. V. and Walton, J. D., Ceram. Eng. Sci. Proc. 5, 712–738 (1984).CrossRefGoogle Scholar
7.Logan, K. V., Sparrow, J. T., and McLemore, W. J. S., in Combustion and Plasma Synthesis of High-Temperature Materials, edited by Munir, Z. A. and Holt, J. B. (VCH, New York, 1990), pp. 219–228.Google Scholar
8.Fu, Y. Z., Yuan, Z. R., and Munir, Z. A., Self-Propagating High-Temperature Synthesis 2 (3), 261–268 (1993).Google Scholar
9.Deevi, S. and Munir, Z. A., J. Mater. Res. 5, 2177–2183 (1990).CrossRefGoogle Scholar
10.Sundaram, V., Logan, K. V., and Speyer, R. F., Advanced Synthesis and Processing of Composites and Advanced Ceramics, Ceramic Transactions, (American Ceramic Society, Westerville, OH, 1995), Vol. 56, pp. 111–120.Google Scholar
11. “JANAF Thermochemical Tables,” J. Physical and Chemical Reference Data, 14, Supplement No. 1, Amer. Chem. Soc. and Amer. Inst. Physics for National Bureau of Standards, Washington, DC, 1985.Google Scholar
12.Levin, E. M., Robbins, C. R., and McMurdie, H. F., in Phase Diagrams for Ceramists, edited by Reser, M. K. (American Ceramic Society, Westerville, OH, 1964), p. 111.Google Scholar
13.Speyer, R. F., Thermal Analysis of Materials (Marcel Dekker, Inc., New York, 1994).Google Scholar
14.Doremus, R. H., in Glass Science (John Wiley and Sons Inc., New York, 1973), pp. 101–114.Google Scholar