Study on Reproducibility and Assignment of Ga-In Eutectic Fixed Point
WANG Cheng-ke1,ZHOU Jing-wei1,WANG Hong-jun2,SUN Jian-ping2,LI Ting2,RUAN Yi-ming1
1. College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China
Abstract The application of secondary fixed point thermometers to temperature calibration has become an important method to reduce the uncertainty of temperature transmission. Focusing on Ga-In binary alloys, aiming at high reproducibility, the development of large-size fixed-point containers and the process of fixed-point infusion are introduced in detail, and the verification experiments on the reproducibility of fixed-points and the excessive gallium temperature plateau of sub-mixture ratio are carried out. The performance of Ga-In fixed point is evaluated and analyzed by three methods of the phase transition temperature determination including the tangent intersection method, the mean value method, and the polynomial fitting method, and then the Ga-In fixed point phase transition temperature is assigned using three standard platinum resistance thermometers. The results show that the Ga-In eutectic fixed point temperature plateau can last for more than 20hours, and the experimental reproducibility is better than 0.15mK. The fixed point phase transition temperature of Ga-In eutectic determined with the tangent intersection method is 15.6494℃, the expanded uncertainty is 0.76mK (k=2).
WANG Cheng-ke,ZHOU Jing-wei,WANG Hong-jun, et al. Study on Reproducibility and Assignment of Ga-In Eutectic Fixed Point[J]. Acta Metrologica Sinica, 2022, 43(2): 169-175.
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2022, Vol. 43 
