Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-05T10:18:24.394Z Has data issue: false hasContentIssue false
  • English
  • Français

Sintering Behavior of Ba2CaWO6-Doped-Tungsten

Published online by Cambridge University Press:  25 February 2011

J.A. Ruud  and
B.P. Bewlay
J.A. Ruud
Affiliation:
General Electric Company, Corporate Research and Development Center, Schenectady, NY 12301
B.P. Bewlay
Affiliation:
General Electric Company, Corporate Research and Development Center, Schenectady, NY 12301
Get access

Abstract

The sintering behavior of Ba2CaWO6 co-sintered with W powder was investigated. Measurements of density and mass loss of sintered compacts showed that the Ba2CaWO6-doped-W had a lower density than undoped W and that there was little volatilization of Ba2CaWO6 at temperatures below 1750 °C. The activation energies for densification of Ba2CaWO6-doped-W and undoped W were both measured to be 389 kJ/mol, which indicates the same densification mechanism, grain boundary diffusion, operated for both materials. The reduced densification kinetics of the Ba2CaWO6-doped-W was probably due to increased coarsening in the early stages of sintering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 553
Copyright
Copyright © Materials Research Society 1994

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

1. Hughes, R.C. and Coppola, P.P., Philips Technical Review 19, 179 (1957).Google Scholar
2. Goldburt, E. and Hellebrekers, W., European Patent No. EP 0489463A2 (1991).Google Scholar
3. Iida, T., Iitoyo, K., and Ito, H, Japanese Patent No. 52–39976 (1977).Google Scholar
4. Ishima, K., Ono, H., and Fukunaga, H., Japanese Patent No. 58–18863 (1983).Google Scholar
5. Sadek, A.A., Ushio, M., and Matsuda, F., Met. Trans. A 21A, 3221 (1990).Google Scholar
6. Mel'nikov, A.I., Morozov, A.V., Popov, B.N., and Maklakov, A.A., Izvest. Akad. Nauk S.S.S.R, Ser. Fiz. 22, 613 (1958).Google Scholar
7. Mihashi, Y., Ito, H., lida, T., and Iitoyo, K., Nippon Tungsten Review 9, 14 (1976).Google Scholar
8. Koitabashi, M. and Sano, K., Mitsubishi Denki Laboratory Reports 14, 53 (1973).Google Scholar
9. Watanabe, K. and Awazu, K., Mitsubishi Denki Laboratory Reports 14, 45 (1973).Google Scholar
10. Chen, L.C., Lou, K.A., and Bewlay, B.P., Proceedings of the Third Int. Conference on Powder Metallurgy in Aerospace, Defense and Demanding Applications, Froes, F.H., ed., 111 (1993).Google Scholar
11. Smithells, C.J., Tungsten (Chapman and Hall, Ltd., London, 1952).Google Scholar
12. Hirayama, C. and Bhalla, R.S., Journal of the Illuminating Engineering Society 9, 240 (1980).Google Scholar
13. Watanabe, K., Saito, M., and Tsuchihashi, M., Journal of Light and Visual Environment 1, 13 (1977).CrossRefGoogle Scholar
14. Cameron, C.P. and Raj, R., J. Am. Ceram. Soc. 71, 1031 (1988).Google Scholar
15. Swinkels, F.B. and Ashby, M.F., Acta Metall. 29, 259 (1981).Google Scholar
16. Vasilos, T. and Smith, J.T., J. Appl. Phys. 35, 215 (1964).CrossRefGoogle Scholar
17. Coble, R.L., J. Appl. Phys. 32, 793 (1964).CrossRefGoogle Scholar
18. Kothari, N.C., J. Less Common Metals 5, 140 (1963).CrossRefGoogle Scholar
19. Hayden, H.W. and Brophy, J.H., J. Less Common Metals 6, 214 (1964).Google Scholar
20. Kreider, K.G. and Bruggerman, G., Trans. AIME 239, 122 (1967).Google Scholar