三段控温固定点炉复现铝凝固点研究

doi:10.3969/j.issn.1000-1158.2021.03.10

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摘要固定点炉垂直温场均匀性是影响ITS-90国际温标固定点温坪质量的重要因素。为了提高铝凝固温坪的复现水平,设计了三段控温固定点炉,利用金属外壳铝固定点容器,研究了垂直温场均匀性及其影响因素;在此基础上,采用连续热流密度法高精度复现了铝凝固点。实验结果表明:通过调整上部、中部、下部炉温的设置,可改善固定点炉温场均匀性,铝凝固温坪4h内的温度变化在1mK以内;此外,在实验条件下,高纯铝相变的过冷度约为0.14℃。

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	何沛
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关键词 ：计量学;铝凝固点;三段控温, 固定点炉;垂直温场;凝固温坪;ITS-90

Abstract：The vertical temperature uniformity of the fixed-point furnace is an important factor affecting the plateau quality of the fixed-points of the International Temperature Scale of 1990 (ITS-90). In order to improve the reproducibility of the aluminum freezing point, a three-zone temperature-controlled fixed-point furnace was designed, and the aluminum fixed point cell with a metal shell was used to study the vertical temperature uniformity and its influencing factors. On this basis, the continuous heat flux method was adopted to precisely realize the aluminum freezing point. The experimental results show that the temperature uniformity can be improved by adjusting the settings of the top, middle, and bottom furnace temperatures, and the temperature stability of the freezing plateau within 4 hours is less than 1mK. The phase transition supercooling of the high purity aluminum is approximately 0.14℃ under the experimental conditions.

Key words： metrology aluminum freezing point three-zone temperature controlled fixed point furnace vertical temperature uniformity freezing plateau ITS-90

收稿日期: 2020-10-09 发布日期: 2021-03-23

PACS:

TB942

基金资助:国家重点研发计划项目(2017YFF0205901)

通讯作者: 林林(1968-),男,山西大同人,北京科技大学教授,从事微观传热传质过程特性、工业生产流程及设备节能减排方面的研究工作。Email: linlin@ustb.edu.cn E-mail: 1036700349@qq.com

作者简介: 何沛(1996-),男,湖北十堰人,北京科技大学硕士研究生,研究方向为温度计量及高温热管。Email: 1036700349@qq.com

引用本文:

何沛,林林,闫小克,张明宇,王宁. 三段控温固定点炉复现铝凝固点研究[J]. 计量学报, 2021, 42(3): 321-326.
HE Pei,LIN Lin,YAN Xiao-ke,ZHANG Ming-yu,WANG Ning. Study on the Realization of Aluminum Freezing Point in the Three-zone Temperature Controlled Fixed Point Furnace. Acta Metrologica Sinica, 2021, 42(3): 321-326.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2021.03.10 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2021/V42/I3/321

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