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2(A) to (E) that the surface tension ( σ ) of freeze slag is increased with the increasing temperature (T) almost straightly, and the temperature coefficient of the slag system in this work is positive, dσ / dT > 0 . It is often explained by the classic theory that the complex silicon oxygen ionic group will decompose into simple forms when the temperature rises, so that the surface tension increased. But the authors think that the Si-O decomposition may be the main reason to make dσ / dT > 0 for the complex multi-component slag containing high SiO2 ( wSiO > 23 % ).

43. [5] P. Hanniala, L. V. 19. [6] S. Akagi, T. Fujii, M. Maeda and Y. Suzuki: Applied Thermal Engineering, Vol. 1053. R. Chen, C. Mei, K. F. Li, J. H. L. Ge: Trans Nonferrous Met Soc China, Vol. 631. [8] M. Nakamoto, A. Kiyose, T. Tanaka, L. Holappa and M. Hämäläinen: The Iron and Steel Institute of Japan, Vol. 38. [9] M. Nakamoto, T. Tanaka, L. Holappa and M. Hämäläinen: The Iron and Steel Institute of Japan, Vol. 211. [10] M. Nakamoto, M. Hanao, T. Tanaka, M. Kawamoto, L. Holappa and M. Hämäläinen: The Iron and Steel Institute of Japan, Vol.

All the calculated parameters were summarized in Table 1. It is shown that the constant k increased with temperature increasing from 600 to 900 °C. That is to say, the oxidation reaction rate increased as temperature rising. The characteristic time calculated by modified Chou model also showed the same results. 34 alloy has the smallest characteristic time at 600, 700 and 800 °C. 12 > ∆E6NCu. 34 is the highest among the four samples. 34 has the best oxidation resistance. This calculated value is in good agreement with the experimental result from literature [3].

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