Fe-C共晶点的复现与温坪特性的研究

摘要

Above the freezing point of copper(1084. 62℃)in the current temperature calibration system,there is no other pure metal fixed point. But the metal-carbon eutectic points, as a new type of fixed points with excellent reproducibility,add temperature fixed points above the freezing point of copper and develop the current level of high temperature measuring value transfer. Although the Fe-C eutectic point is very close to the freezing point of copper,it is still very useful to provide valuable experience for the perfusion and repetition of higher eutectic points. A one-class standard S-type thermocouple is used for measuring the temperature plateaus of Fe-C eutectic point,and the eutectic point temperatures fluctuate is in the range of 1152. 4~1152. 5 ℃.%在温度量传体系中，铜凝固点（1084.62℃）以上目前还没有其他纯金属固定点，而金属-碳共晶点作为新兴的固定点具备良好的复现性，可补充铜点以上的温度固定点，拓展现有的高温温度量值传递水平。尽管Fe-C共晶点非常接近铜凝固点，但其仍有较高的使用价值，可为更高温共晶点灌注及复现提供宝贵的经验。用一等标准S偶对Fe-C共晶点的温坪进行测量，其共晶点温度为1152.4~1152.5℃。