Abstract The experimental setup of reproducing Co-C high temperature eutectic point is introduced, and the effect on the reproducibility from a variety of temperature boundary conditions is analyzed by comparing the experimental data under different temperature conditions. The result shows that the temperature boundaries could affect the duration of temperature platform through the increase and decrease in temperature. The metal melted more quickly when the upper boundary of temperature was higher. While different lower boundaries of temperature could cause the difference in freezing points, with a difference of 0.003937mV from -30 ℃ to -20 ℃. When the lower boundary of temperature was lower, the freezing point temperature became lower.
LIU Yu-sheng,Lü Guo-yi,YANG Xin-yuan. Effect of Temperature Boundary on Reproducibility for Co-C High Temperature Eutectic Point[J]. Acta Metrologica Sinica, 2015, 36(6A): 8-11.
［1］Yamada Y, Sakate H, Sakuma F, et al. Radiometric observation of melting and freezing plateaus for a series of metal-carbon eutectic points in the range 1 330 ℃ to 1 950 ℃ ［J］. Metrologia, 1999, 36(3):207-209.
［2］Yamada Y, Sakate H, Sakuma F, et al. High-temperature fixed points in the range 1 150 ℃ to 2 500 ℃using metal-carbon eutectics［J］. Metrologia, 2001, 38(3):213-219.
［3］Yamada Y, Duan Y, Ballico M, et al. Measurement of Rh-C, Pt-C and Ru-C eutectic points by four national metrology institutes［J］. Metrologia, 2001, 38(3):203-212.
［4］Edler F, Baratto A C. A cobalt-carbon eutectic fixed point for the calibration of contact thermometers at temperatures above 1 100 ℃［J］. Metrologia, 2005, 42(4):201-207.
［5］Yamada Y, Sakuma F, Ono A. Thermocouple Observations of Melting and Freezing Plateaus for Metal-Carbon Eutectics between the Copper and Palladium Points［J］. Metrologia, 2000, 37(1):71-73.
［6］Kim Y G, Yang I, Kwon S Y, et al. Features of Co/C and Ni/C Eutectic Transitions for Use in Thermocouple Thermometry［J］. Metrologia, 2006, 43(1):67-70.
［7］Pearce J, Montag V, Lowe D, et al. Melting Temperature of High-Temperature Fixed Points for Thermocouple Calibrations［J］. International Journal of Thermophysics, 2011, 32(1-2):463-470.
［8］Inseok Y, Yong-Gyoo K, Kee Sool G. The Dependence of the Melting Temperatures of the Eutectics Fe-C and Co-C, Designed for Thermocouple Thermometry, on the Furnace Offset Temperature During the Preceding Freeze［J］. Measurement Science and Technology, 2008, 19(1):015106.
［9］Lowe D, Heufelder S. Effect of Solid–Liquid Interface Velocity on the Measured Upper and Lower Limits of the Liquidus Temperature of Cobalt–Carbon Eutectic Fixed Points［J］. Metrologia, 2013, 50(3):227-234.
［10］王铁军,柏成玉,原遵东,等. 高温共晶固定点的建立与复现［J］.计量学报,2007,28(z1):23-27.
［11］王建华,肖常志,董伟,等. Co-C共晶高温固定点灌注研究［J］.计量学报,2013,32(z1):58-61.
［12］郑玮,梁兴忠,吴健. 用于分度热电偶的Co-C高温共晶点的制作和复现性研究［J］.计量学报,2013,34(5):430-434.
2015, Vol. 36 
