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Effect of solid-liquid interface velocity on the measured upper and lower limits of the liquidus temperature of cobalt-carbon eutectic fixed points.

Lowe, D H B; Heufelder, S* (2013) Effect of solid-liquid interface velocity on the measured upper and lower limits of the liquidus temperature of cobalt-carbon eutectic fixed points. Metrologia, 50 (3). pp. 227-234.

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Abstract

The melting temperatures of the eutectic phase transitions of cobalt-carbon, platinum-carbon and rhenium-carbon alloys are proposed as reference standards for high temperature radiation thermometry. The behaviour of these is such that rather than a unique readily identified feature being specified, upper and lower limits will be given. The lower limit will be the point of inflection in the melting curve, a point previously identified as unchanging with the rate at which melting takes place. The upper limit will be based on an extrapolation of the tangent at the point of inflection. The melting curves of cobalt-carbon fixed points have been measured and it is found that the point of inflection does have a melting rate dependence and the limits converge as the melting rate is reduced. This may have implications for planned research into assignment of thermodynamic temperature to these fixed points.

Item Type: Article
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1088/0026-1394/50/3/227
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5856

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