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Manufacturing of MC eutectics and reproducibility of Pt-C eutectic fixed points using a thermogauge furnace.

Wang, T*; Lowe, D; Machin, G (2009) Manufacturing of MC eutectics and reproducibility of Pt-C eutectic fixed points using a thermogauge furnace. Int. J. Thermophysics, 30 (1). pp. 59-68.

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Abstract

National Institute of Metrology (NIM) (China) and National Physical Laboratory (NPL) (UK) have collaborated to construct metal-carbon eutectic alloy fixed points at NPL. A modified NPL Thermogauge furnace was vertically used to construct fixed points of Pd-C, Pt-C, Ru-C, and Ir-C. Breakage of Pd-C and Ru-C cells was traced to changes in furnace temperature gradients resulting from changing from horizontal to vertical operation. Subsequently, it was found that positioning the cell being filled so that the metal melting always starts from the top and freezing from the bottom to solve this problem. The constructed Pt-C cell was then compared to a Pt-C fixed point previously constructed by NIM. The results indicate that the two cells made independently agreed to be better than 40 mK.

Item Type: Article
Keywords: carbon eutectic, eutectic, temperature fixed points, high temperature standard
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1007/s10765-008-0437-6
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/5112

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