Journal of Materials Science

, Volume 25, Issue 8, pp 3566–3572 | Cite as

Densification and microstructure development in the reaction sintering process of yttrium iron garnet

  • R. J. Young
  • T. B. Wu
  • I. N. Lin


Factors affecting the densification and microstructure development in the reaction sintering process (RSP) of yttrium iron garnet were investigated. Three different powder mixtures were used: Fe2O3/Y2O3, Fe2O3/YFeO3 (1100 ° C calcined), and Fe2O3/YFeO3 (1200 ° C calcined). The conventionally prepared garnet powder was also adopted as a reference material. It was found that the RSP using Fe2O3-YFeO3 systems has a beneficial effect on densification from the dilatation occurring along with the reaction of garnet formation. On the other hand, it has a detrimental effect due to the local contraction induced by the reaction in the Fe2O3-Y2O3 system. The densification rate and ultimate density achievable are also affected by the YFeO3 powder adopted in RSP. A high grain-growth rate was obtained for garnet when the 1200 ° C calcined YFeO3 powder was used. This leads to a high densification rate at low temperature. However, the densification ability deteriorates at temperatures above 1425 ° C due to the trap of pores in the fast-grown grains. Conversely, the grain-growth rate in RSP with 1100 ° C-calcined YFeO3 was moderate, and although it gives a slower densification rate at low temperature, the ultimate density can be raised to ≈ 99% theoretical density at ⩾ 1450 ° C.


Reference Material Detrimental Effect Yttrium Microstructure Development Powder Mixture 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    G. R. Harrison andL. R. Hodges Jr., in “Physics of Electronic Ceramics”, edited by L. L. Hench and D. B. Dove (Marcel Dekker, New York, 1972) p. 857.Google Scholar
  2. 2.
    G. R. Blair, A. C. D. Chaklader andN. M. P. Low,Mater. Res. Bull. 8 (1973) 161.Google Scholar
  3. 3.
    O. Prokash andC. M. Srivastava,ibid. 15 (1980) 665.Google Scholar
  4. 4.
    G. A. Naziripour,et al.,J. Mater. Sci. 20 (1985) 375.Google Scholar
  5. 5.
    W. P. Wolf andG. P. Rodrigue,J. Appl. Phys. 29 (1958) 105.Google Scholar
  6. 6.
    J. Y. Laval,J. Mater. Sci. 13 (1978) 1937.Google Scholar
  7. 7.
    M. Multani et al., Mater. Res. Bull. 14 (1979) 1251.Google Scholar
  8. 8.
    M. S. Multani et al., ibid. 16 (1981) 1535.Google Scholar
  9. 9.
    P. D. D. Rodrigo andP. Boch,Int. J. High Tech. Ceram. 1 (1985) 3.Google Scholar
  10. 10.
    Y. Miyamoto andM. Koizumi,Commun. Amer. Ceram. Soc. 67 (1984) C-224.Google Scholar
  11. 11.
    O. Yamada, Y. Miyamoto andM. Koizumi,Amer. Ceram. Soc. Bull. 64 (1985) 319.Google Scholar
  12. 12.
    G. R. Terwilliger andF. F. Lange,J. Mater. Sci. 10 (1975) 1169.Google Scholar
  13. 13.
    C. J. Quinn andD. L. Kohlstedt,J. Mater. Sci. 19 (1984) 1229.Google Scholar
  14. 14.
    R. L. Coble, in “Sintering-Theory and Practice” edited by D. Kolar, S. Pejovnik and M. M. Ristic (Elsevier Scientific, Amsterdam, 1982) p. 145.Google Scholar
  15. 15.
    R. J. Young, T. B. Wu andI. N. Lin,Mater. Res. Bull. 22 (1987) 1475.Google Scholar
  16. 16.
    C. Herring,J. Appl. Phys. 21 (1950) 301.Google Scholar
  17. 17.
    A. Sztaniszlav et al., J. Mag. Mag. Mater. 41 (1984) 75.Google Scholar
  18. 18.
    U. Wolfmerier andW. Gunsser, in “Reactivity of Solids” Vol. 2, edited by K. Dyrek, J. Habar and J. Nowotny (Polish Scientific Publishers, Warszawa, 1982) p. 1026.Google Scholar

Copyright information

© Chapman and Hall Ltd 1990

Authors and Affiliations

  • R. J. Young
    • 1
  • T. B. Wu
    • 1
  • I. N. Lin
    • 2
  1. 1.Department of Materials Science and EngineeringNational Tsing Hau UniversityHsinchuTaiwan
  2. 2.Chung-Shan Institute of Science and TechnologyLung-TanTaiwan

Personalised recommendations