|
|
|
| Zinc Fixed Point Reproduction Apparatus Based on the Quasi Adiabatic |
| WANG Wei1,SUN Jian-ping2,ZENG Fan-cao3,FANG Xin-yun4 |
1. Guangzhou Institute of Measuring and Testing Technology, Guangzhou, Guangdong 510030, China;
2. National Institute of Metrology, Beijing 100029, China
3. Chengdu University of Technology, Chengdu,Sichuan 610059,China
4. Suzhou Institute of Measuring and Testing Technology, Suzhou, Jiangsu 215128, China |
|
|
|
|
Abstract The plateau of fixed-point realization is affected by many aspects in ITS-90, temperature uniformity is one of the most important factors. To improve the temperature field performance and reduce the influence caused by leakage, refer to the adiabatic principle which was widely used in the apparatus of low temperature fixed point, a zinc fixed point apparatus based on the quasi adiabatic is design.The temperature grads properties 100 mK of the traditional fixed point is reducted to 20 mK, the usage amount of metal is also reduced from 2.0 kg to 200 g. The experimental results show that the temperature plateau sustainable long time, and the reproducibility of the apparatus can be reduced to 0.1 mK.The apparatus can greatly improve the properties of temperature field, reduce the factors of interference evaluation for effect of trace impurities in high purity metal on the phase transition temperature. The miniaturization of the device can be used repeatedly to achieve economic and practical purposes, and also give the impact assessment of trace impurities in high purity metal phase change temperature which provides the basis for reduction interference of the temperature field.
|
|
Received: 26 October 2015
Published: 14 October 2016
|
|
|
|
|
|
［1］Ripple D, Pokhodun A, Steur P, et al. Recommended List of Common Impurities for Metallic Fixed-point Materials of the ITS-90［R］. Document CCT/08-16, 2008.
［2］Sun J P, Stefen R, Zhang J T, et al. Effect of ultra-trace impurities on the freezing point of zinc［J］. International Journal of Thermophysics, 2014, 35(6-7):1134-1146.
［3］Nubbemeyer H G, Fischer J. Final report on key comparison CCT-K4 of local realizations of aluminium and silver freezing-point temperatures［J］. Metrologia, 2002, 39(1A):03001.
［4］Mangum B W. On the Influence of Impurities on Fixed-point Temperature ［R］. Document CCT99-11, 1999.
［5］Mangum B W, Strouse G F, Guthrie W F, et al. Summary of comparison of realizations of the ITS-90 over the range 83.8058K to 933.473K:CCT key comparison CCT-K3［J］. Metrologia, 2002, 39(2):179-205.
［6］Steffen R, Martin F. Improved Characterization and Certification Procedure for Fixed-Point Cells ［J］. 计量学报, 2008, 29(z1):82-85.
［7］孙建平,刘植松,邱萍,等.准绝热开口氩三相点复现装置［J］.仪器仪表学报,2011, 32(6B):1420-1425.
［8］孙建平,张金涛,刘建庆,等.新型开口锌凝固点复现装置［J］.计量技术,2012,（9）:3-6.
［9］孙建平,邱萍,金志军.新一代锌固定点容器的研制［J］.计量学报,2007, 28(z1):51-54.
［10］孙建平,武鑫财,张欣欣,等.超微量杂质对锌凝固点相变温度影响的研究进展［J］.计量学报,2012, 33(z2):33-37.
［11］Sun J P, Rudtsch S. Quasi-Adiabatic Investigations of Lead in Indium［J］.International Journal of Thermophysics, 2014, 35(6-7):1127-1133.
［12］Qiu P, Sun J P.Influence of Impurities on Zinc freezing Point ［J］.计量学报, 2008, 29(z1):79-81.
［13］White D R, Mason R S. Improved Initiation Technique for the Metal Fixed Points［J］.International Journal of Thermophysics, 2010, 32(1):348-359. |
|
|
|
2016, Vol. 37 
