溴苯熔点研制及复现方法研究

doi:10.3969/j.issn.1000-1158.2022.02.03

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摘要研制了可用于工业铂电阻温度计现场校准的溴苯熔点。对溴苯过冷度、熔点复现性进行了实验研究,并比较了基于曲线拟合法和切线交点法的两种熔点取值方法,最后对溴苯熔化温坪用于现场校准的实用性进行分析,提出了溴苯熔点的使用建议。实验表明:溴苯凝固前的保温温度越接近其凝固点温度,过冷度越小;溴苯熔化时保温温度越高,升温速率越大,熔化温坪斜率越大,熔化温坪维持时间越短;当保温温度设置为-30℃时,溴苯熔化温坪可持续6h以上,熔化温坪拐点的复现性优于2.5mK,溴苯熔点平均值为-30.8301℃,可以满足工业铂电阻温度计现场校准的要求。

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	杨月
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	阮一鸣

关键词 ：计量学;次级固定点;溴苯熔点, 变特性;现场校准

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.

Key words： metrology secondary fixed point bromobenzene melting point phase change characteristic field calibration

收稿日期: 2020-10-30 发布日期: 2022-02-23

PACS:

TB942

基金资助:国家重点研发计划重点专项(2017YFF0206300/2017YFF0206303);国家重点研发项目(2018YFB0504700/2018YFB0504702)

通讯作者: 孙建平(1978-),男,陕西眉县人,中国计量科学研究院研究员,从事温度计量及材料热物性研究。Email: sunjp@nim.ac.cn E-mail: sunjp@nim.ac.cn

作者简介: 杨月(1995-),女,河北唐山人,中国计量大学研究生,研究方向为温度测量及校准技术。Email: 1962176560@qq.com

引用本文:

杨月,陈乐,孙建平,李婷,郝小鹏,阮一鸣. 溴苯熔点研制及复现方法研究[J]. 计量学报, 2022, 43(2): 157-162.
YANG Yue,CHEN Le,SUN Jian-ping,LI Ting,HAO Xiao-peng,RUAN Yi-ming. Study on the Development and Reproducibility of Bromobenzene Melting Point. Acta Metrologica Sinica, 2022, 43(2): 157-162.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2022.02.03 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2022/V43/I2/157

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