Ga-In共晶固定点复现及赋值研究

doi:10.3969/j.issn.1000-1158.2022.02.05

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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).

Key words： metrology ITS-90 Ga-In binary alloy mini eutectic fixed point phase transition temperature

Received: 21 October 2020 Published: 23 February 2022

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TB942

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	Articles by authors
	WANG Cheng-ke
	ZHOU Jing-wei
	WANG Hong-jun
	SUN Jian-ping
	LI Ting
	RUAN Yi-ming

Cite this article:

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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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2022.02.05 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2022/V43/I2/169

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