诱导方式对锌凝固温坪的影响  

The Influence of Inducing Methods on the Zinc Freezing Plateaus

作　　者：胡子亮 闫小克[2] 熊亚选[1] 张明宇[2] HU Ziliang;YAN Xiaoke;XIONG Yaxuan;ZHANG Mingyu(Beijing Key Lab of Heating,Gas Supply,Ventilating and Air Conditioning Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;National Institute of Metrology,Beijing 100029,China.)

机构地区：[1]北京建筑大学供热供燃气通风及空调工程北京市重点实验室,北京100044 [2]中国计量科学研究院,北京100029

出　　处：《计量学报》2024年第4期527-532,共6页Acta Metrologica Sinica

基　　金：国家重点研发计划(2017YFF0205901)。

摘　　要：锌凝固点是ITS-90国际温标的定义固定点,也是标准铂电阻温度计分度的重要参考点。为了提高锌凝固点的复现水平,利用金属外壳锌固定点容器,研究了不同诱导方式对锌凝固温坪及过冷度的影响。采用总体最大估计法确定杂质浓度,通过杂质浓度变化及熔凝温坪差异判断金属外壳锌点容器的可靠性。实验结果表明:金属外壳锌点容器具有良好的可靠性;不同诱导次数下分别采用石英、不锈钢及镍材料的诱导棒获得的锌凝固温坪值在0.15 mK范围内一致,即不同诱导方式均可得到高质量的锌凝固温坪;诱导方式对高纯锌的过冷度没有影响。The zinc freezing point is the defining fixed-point of the International Temperature Scale of 1990(ITS-90).Also,it is an important reference point for calibrating standard platinum resistance thermometers(SPRT).In order to improve the level of realization of the zinc freezing point,the zinc fixed point cell with metal shell was used to study the influence of different inducing methods on the zinc freezing plateaus and supercoolings.The Overall Maximum Estimate(OME)method was adopted to determine the impurity concentration.The reliability of the cell was evaluated using the changes of the impurity concentrations and the differences between the melting plateaus and freezing plateaus.The results showed that the zinc fixed point cell with metal shell had good reliability;under different induction times,the value of zinc freezing plateaus obtained by using quartz,stainless steel and nickel inducation rods was consistent in the range of 0.15 mK,that is,the different inducing methods can obtain good zinc freezing plateaus;and the inducing methods had no effect on the supercoolings of high purity zinc.

关 键 词：温度计量 锌凝固点 温坪 90国际温标 诱导方式 

分 类 号：TB942[一般工业技术—计量学]