Materials Transactions Online

Materials Transactions, Vol.58 No.04 (2017) pp.613-618
© 2017 The Japan Institute of Metals and Materials

Removal of Oxygen in Ti-Si Melts by Arc-Melting

Masahito Watanabe1, Fumiya Sato1, Kyosuke Ueda1, Daisuke Matsuwaka2 and Takayuki Narushima1

1Department of Materials Processing, Tohoku University, Sendai 980-8579, Japan
2Materials Research Laboratory, Kobe Steel, Ltd., Kobe 651-2271, Japan

Oxygen removal from Ti-Si melts (Si: 9.1-30 mass%) during arc melting was investigated. High-purity Si was added to either Ti with a high oxygen content (High O Ti, O: 1.6 mass%) or commercially pure Ti (CP Ti, O: 0.104 mass%) melted under Ar or He gas flow conditions at atmospheric pressure. At Si additions of 23 mass% and 30 mass%, the oxygen content of the Ti-Si ingots decreased. After melting, Si and amorphous SiO2 powders were observed in the chamber, which suggested that the oxygen in the melts was removed in the form of SiO gas. The oxygen content of the Ti-Si ingots after melting varied as a function of position within the ingot; the residual oxygen content was lowest in the top section of the ingots and highest in the bottom section. Under the Ar gas flow, the oxygen content of the High O Ti-30Si ingot decreased to 0.136 mass% and 0.609 mass% in the top and center sections of the ingot, respectively; similarly, the oxygen content of the CP Ti-30Si ingot decreased to 0.030 mass% and 0.051 mass% in the top and center sections, respectively. After melting under He gas flow, the oxygen contents of the CP Ti-30Si ingot in the top, center, and bottom sections were 0.020 mass%, 0.021 mass%, and 0.029 mass%, respectively. Better uniformity of oxygen distribution in the ingots was achieved under the He gas flow than under the Ar gas flow because the melted region is extended in the depth direction by using He gas. During melting, no significant evaporation of Ti and Si occurred, which is an advantage of arc melting that operates at atmospheric pressure over electron beam melting that occurs in vacuum.


(Received 2017/01/06; Accepted 2017/01/27; Published 2017/03/25)

Keywords: titanium melt, silicon, oxygen, arc-melting, SiO

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  1. W. Zhang, Z. Zhu and C.Y. Cheng: Hydrometallurgy 108 (2011) 177-188.
  2. C. Cui, B. Hu, L. Zhao and S. Liu: Mater. Des. 32 (2011) 1684-1691.
  3. X. Lu, T. Hiraki, K. Nakajima, O. Takeda, K. Matsubae, H.-M. Zhu, S. Nakamura and T. Nagasaka: Separ. Purif. Tech. 89 (2012) 135-141.
  4. M. Niinomi, T. Hanawa and T. Narushima: JOM 57(4) (2005) 18-24.
  5. Japan Oil, Gas and Metals National Corporation, Mineral resource material flows, (2015).
  6. R.O. Suzuki: TITANIUM JAPAN 52 (2004) 281-287 (in Japanese).
  7. T. Narushima: TITANIUM JAPAN 61 (2013) 126-131 (in Japanese).
  8. R.O. Suzuki, K. Teranuma and K. Ono: Metall. Mater. Trans. B 34 (2003) 287-295.
  9. G.Z. Chen, D.J. Fray and T.W. Farthing: Nature 407 (2000) 361-364.
  10. F. Cardarelli: World Patent, WO 03/046258 (2003) A2.
  11. T. Takenaka, H. Matsuo, M. Sugawara and M. Kawakami: Key Eng. Mater. 436 (2010) 85-91.
  12. T.H. Okabe, T. Oda and Y. Mitsuda: J. Alloy Compd. 364 (2004) 156-163.
  13. T. Yahata, T. Ikeda and M. Maeda: Metall. Trans. B 24 (1993) 599-604.
  14. A. Powell, J.V.D. Avyle, B. Damkroger, J. Szekely and U. Pal: Metall. Mater. Trans. B 28 (1997) 1227-1239.
  15. T. Ikeda and M. Maeda: ISIJ Int. 32 (1992) 635-642.
  16. F. Holleman, E. Wiberg and N. Wiberg, Inorganic chemistry, pp 858-859, Academic Press, San Diego (2001).
  17. K. Fitzner: Thermochim. Acta 52 (1982) 103-111.
  18. M.W. Chase Jr., NIST-JANAF Thermochemical Tables, fourth ed. part II, pp 1728, American Institute of Physics, New York (1998).
  19. M. Tanaka, M. Ushio and J.J. Lowel: JSME Int. J. Ser. B 48 (2005) 397-404.
  20. S. Kirihara, Y. Tomota and T. Tsujimoto: Mater. Sci. Eng. A 239-240 (1997) 600-604.
  21. Z. Chen, Y. Li, Y. Tan and K. Morita: Mater. Trans. 56 (2015) 1919-1922.


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