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Synopsis: Knowledge of viscosity of liquid metals and alloys is valuable pratically and theoretically, and accurate data should be particularly important on the consideration of the structure of liquid metals and alloys. An accurate measurement of viscosity, however, especially on high temperature such as on liquid iron is quite difficult and most of the data having been obtained may be dcubtful in their reliability. For the purpose of carrying out precise measurement of viscosity of liquid metals and alloys at high temperature an improved apparatus for viscosity measurement by oscillating crucible method was made, and through the experiments using this apparatus some fundamental problems on the viscosity measurement were analytically examined and discussed. The main results obtained are summarized as follows: ( 1 ) From an analysis of the oscillation modes on distilled water, n-heptane and liquid mercury, it was concluded that oscillation periods shorter than about 4 seconds should not be employed for the measurement because of the occurrence of the irregular flow in liquid. The most reliable result was obtained at the periods of about 7 seconds on present apparatus. ( 2 ) The atmosphere used in the viscosity measurement is very important factor affecting the accuracy of the measurement especially at high temperature. Although Ar was inadequate for this purpose on account of its large disturbing effects on the oscillation, in He atmosphere these effects were remarkably small. Therefore, the use of He was considered to be preferable. ( 3 ) From a series of experimental analysis, it was confirmed that under the suitable experimental condition it was possible to measure the viscosity of liquid metals and alloys at high temperature with sufficient accuracy using the apparatus presented in this paper. (Received Mar. 19, 1970)

Fundamental Study on the Viscosity Measurement of Molten Metals by Oscillating Crucible Method