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Study on the Development and Reproducibility of Bromobenzene Melting Point |
YANG Yue1,CHEN Le1,SUN Jian-ping2,LI Ting2,HAO Xiao-peng2,RUAN Yi-ming1 |
1. College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China |
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Abstract The apparatus of bromobenzene melting point is developed for the on-site calibration of platinum resistance thermometers. The supercooling characteristics and melting point of bromobenzene are investigated. In addition, the methods of curve fitting and tangent intersection are compared for melting point temperature determination. Finally, the practicability of bromobenzene melting temperature plateau for the on-site calibration is analyzed and some recommendations for the use of bromobenzene melting point are also put forward. The experiments show that when the holding temperature for the bromobenzene before freezing procedure is closer to its freezing point temperature, the degree of the supercooling is smaller. During the melting procedure, when the holding temperature is warmer, the heating rate becomes larger, the width of the melting curve becomes wider and the maintenance time of the melting temperature plateau becomes shorter; When the holding temperature during melting procedure is set to -30℃, the melting plateau of bromobenzene can last for more than 6hours. By caluculation, the reproducibility of the inflection point is better than 2.5mK, and the average melting point of bromobenzene is -30.8301℃, which can meet the demand of on-site calibration requirements of industrial platinum resistance thermometer.
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Received: 30 October 2020
Published: 23 February 2022
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[1]刁福广, 蔡晋辉, 孙建平, 等. Ga-In-Sn微型共晶点相变特性研究[J]. 计量学报, 2019, 40(3): 71-76.
Diao F G, Cai J H, Sun J P, et al. Study on Phase Transition Characteristic of Mini Ga-In-Sn Eutectic Fixed Point[J]. Acta Metrologica Sinica, 2019,40(3):71-76.
[2]Ragay-Enot M , Lee Y H , Kim Y G . Fabrication of a mini multi-fixed-point cell for the calibration of industrial platinum resistance thermometers[J]. Measurement ence and Technology, 2017, 28(7): 075007.
[3]曾凡超,孙建平,胡翔,等.基于微型固定点的温度传感器现场标定技术研究[J].计量技术,2018(10):29-32.
[4]Preston-Thomas H, Quinn T J. The International Temperature Scale of 1990(ITS-90)[J]. Ibid, 1990, 27(1): 3-10.
[5]Tew W L, Quelhas K N. Realizations of the Triple Point of Sulfur Hexafluoride in Transportable and Refillable Cells[J]. Journal of Research of the National Institute of Standards & Technology, 2018, 123: 12013.
[6]Bedford R E, Bonnier G, Maas H, et al. Recommended values of temperature on the International Temperature Scale of 1990 for a selected set of secondary reference points[J]. Metrologia,1996,33(2):133-154.
[7]Masi J F, Scott R B. Some thermodynamic properties of bromobenzene from 0 to 1500 K[J]. Journal of Research of the National Bureau of Standards Section A Physics and Chemistry, 1975,79A(5):619.
[8]Ancsin J. Manipulating the Melting Behavior of Metal-Metal Eutectics[J]. International Journal of Thermophysics, 2008, 29(1): 181-189.
[9]曾佳旭,潘江,孙建平,等. 微型双温度固定点容器研制[J]. 计量学报, 2021, 42(4): 458-462.
Zeng J X, Pan J, Sun J P, et al. Development of Miniature Double Temperature Fixed Point Cell[J]. Acta Metrologica Sinica, 2021, 42(4): 458-462.
[10]Krapf G, Schalles M. Estimation of fixed-point temperatures—A practical approach[J]. Measurement, 2011, 44(2): 385-390.
[11]李利峰, 李锐, 闫小克, 等. 镓熔点温坪复现研究[J]. 计量学报, 2020, 41(4): 419-424.
Li L F, Li R, Yan X K, et al. Study on the Realization of Gallium Melting Point Plateau[J]. Acta Metrologica Sinica, 2020, 41(4): 419-424.
[12]孙建平, 邱萍, 张金涛. 微量杂质对锌凝固点影响的评估[J]. 计量学报, 2010, 31(3): 223-228.
Sun J P, Qiu P, Zhang J T. The EVaIuation Of lhe Influence of lmpurifjes On the Freezing Point Of Zinc[J]. Acta Metrologica Sinica, 2010, 31(3): 223-228.
[13]Ancsin J. Al-Si eutectic: a study of its melting and freezing behaviour[J]. Metrologia,2006,43(2):S158.
[14]Rourke C P M. The triple point of sulfur hexafluoride[J]. Metrologia, 2016, 53(2): L1-L6.
[15]Lowe D, Heufelder S. Effect of solid-liquid interface velocity on the measured upper and lower limits of the liquidus temperature of cobalt-carbon eutectic fixed points[J]. Metrologia, 2013, 50(3): 227-234.
[16]Lowe D, Machin G. Evaluation of methods for characterizing the melting curves of a high temperature cobalt-carbon fixed point to define and determine its melting temperature[J]. Metrologia, 2012, 49(3): 189-199.
[17]徐春媛, 夏蔡娟, 郝小鹏, 等. 准绝热法微型镓固定点相变特性研究[J]. 计量学报,2017,38(1):19-22.
Xu C Y, Xia C J, Hao X P, et al. Research on Phase Change Characteristic of Miniature Gallium Fixed-point Using Quasi-adiabatic Measurement Method[J]. Acta Metrologica Sinica, 2017, 38(1): 19-22. |
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