Materials Transactions Online

Materials Transactions, Vol.51 No.09 (2010) pp.1656-1662
© 2010 The Japan Institute of Metals

Evaluation of Yttria Applicability as a Crucible for Induction Melting of TiAl Alloy

Toshimitsu Tetsui1, Toshiharu Kobayashi1, Takashi Mori2, Tatsuya Kishimoto1 and Hiroshi Harada1

1High Temperature Materials Center, National Institute for Materials Science, Tsukuba 305-0047, Japan
2Iwao Jiki Kogyo Co., Ltd., Arita 844-8555, Japan

In seeking cost reductions for precision cast parts made of TiAl alloy, application of induction melting using a ceramic crucible would be highly effective. Accordingly, consideration was given to the applicability of yttria as the material basis for such a ceramic crucible. Crucible specifications were first investigated, and a prototype crucible was fabricated with a suitable mixture ratio of raw materials from the standpoint of satisfactory thermal shock resistance and low reactivity with TiAl molten metal. As a result of induction melting testing of Ti-46 at%Al alloy, the developed crucible was found to facilitate substantially less contamination of the TiAl alloy, with lower oxygen concentration and hardness as compared with other conventional ceramic crucibles.

(Received 2010/4/20; Accepted 2010/6/16; Published 2010/7/28)

Keywords: TiAl, induction melting, ceramic crucible, yttria, thermal shock resistance, contamination

PDF(Free)PDF (Free) Table of ContentsTable of Contents

REFERENCES

  1. T. Tetsui and S. Ono: Intermetallics 7 (1999) 689–697.
  2. T. Tetsui: Adv. Eng. Mater. 3 (2001) 307–310.
  3. T. Tetsui: Mater. Sci. Eng. A 329–331 (2002) 582–588.
  4. T. Fujimura, H. Nishikawa, N. Moriya and M. Imamura: IHI Gihou 48 (2008-9) 153–158.
  5. M. Weimer and T. Kelly: Structural Aluminides for Elevated Temperatures, Gamma Titanium and Other Metallic Aluminides, (TMS, Warrendale, 2008) pp.5–6.
  6. T. Noda: Intermetallics 6 (1998) 709–713.
  7. D. E. Larsen: Mater. Sci. Eng. A 213 (1996) 128–133.
  8. F. Gomes, J. Barbosa and C. S. Ribeiro: Intermetallics 16 (2008) 1292–1297.
  9. J. P. Kuang, R. A. Harding and J. Campbell: Int. J. Cast. Metals Res. 13 (2001) 277–292.
  10. J. Barbosa and C. S. Ribeiro: Int. J. Cast. Metals Res. 12 (2000) 293–301.
  11. J. P. Kuang, R. A. Harding and J. Campbell: Mater. Sci. Technol. 16 (2000) 1007–1016.
  12. N. Sakuma, T. Mitsui, H. Kurabe and T. Tsuijimoto: Tetsu-to-Hagane 78 (1992) 172–179.
  13. I. Barin: Thermochemical data of pure substances, (VCH-Verlag, Weinheim, 1989).


[JIM HOME] [JOURNAL ARCHIVES]

© 2010 The Japan Institute of Metals
Comments to us : editjt@jim.or.jp