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
Article

Abstract

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.

Keywords

Reference Material Detrimental Effect Yttrium Microstructure Development Powder Mixture 

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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

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