Materials Transactions Online

Transactions of the Japan Institute of Metals, Vol. 16 No. 2 (1975) pp.87-94
© 1975 The Japan Institute of Metals

Activity Measurements of the Binary Mn-Base Molten Alloys by the TIE Method*

Kazuhisa Okajima** and Hiroshi Sakao**

The present study was carried out in an attempt to measure the activities of manganese in the Mn-base molten alloys at a high temperature of 1300°C by using the TIE method.
At the moment the electrolyte comes in contact with both electrodes, the concentration cell for the Mn-Sb molten alloy may be represented as follows:

Mn(l)|MnF2+CaF2+MgF2(l)|Mn-Sb(l).
The measurements for the Mn-Sb, Mn-Ni, Mn-Cu and Mn-Sn alloy systems revealed the following results:
(1) The activities for the Mn-base alloys tend to form horizontal portions in the two concentration ranges.
(2) The measured activities of the Mn-Cu and Mn-Sn systems have revealed remarkable discrepancies by the e.m.f. and vapor pressure methods.
(3) It is concluded that the activity measurements at 1300°C using the TIE method can be performed with a reasonable degree of accuracy.

(Received June 8, 1974)


* This paper was presented at the Meeting of the Japan Institute of Metals, held at Narashino on April 3, 1974.

** Department of Metallurgy, Faculty of Engineering, Nagoya University, Nagoya 464, Japan.

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