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
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
复制标题
为热电偶测温设计的共晶 Fe-C 和 Co-C 的熔化温度与先前冻结期间炉偏移温度的关系
DOI：
10.1088/0957-0233/19/1/015106
复制
发表时间：
2007
影响因子：
2.4
通讯作者：
K. Gam
中科院分区：
文献类型：
--
作者：
I. Yang;Yong;K. Gam
我们研究了为热电偶测温而设计的Fe-C共晶系统熔化温度与预冻结炉偏移温度的关系，并将结果与Co-C共晶系统的测量结果进行了比较。当冻结前偏置温度从−3 K改变为−70 K时，Fe-C共晶体系的熔化温度的位移增加了0.1 K。我们的结果表明，当Fe-C系统的熔化温度作为热电偶校准的参考温度时，必须注意确定和控制前冻结期间的炉内偏移温度以及熔化期间的炉内偏移温度。在仔细控制炉的偏移温度下，通过预冻或熔化对铁-碳电池熔化温度的影响可以限制在低至0.04 K的热电偶校准。
We have studied the pre-freezing furnace offset temperature dependence of the melting temperature of the Fe–C eutectic system, designed for thermocouple thermometry, and compared the results to those measured accordingly for the Co–C eutectic system. When the pre-freezing offset temperature was changed from −3 K to −70 K, the shift of the melting temperature of the Fe–C eutectic system increased by 0.1 K. Our results suggest that care must be taken on deciding and controlling the furnace offset temperature during the preceding freeze as well as the furnace offset temperature during the melt when the melting temperature of the Fe–C system is used as a reference temperature for thermocouple calibrations. Under careful control of the offset temperature of the furnace, its effect via pre-freeze or melt on the melting temperature of the Fe–C cell can be confined to as low as 0.04 K for thermocouple calibrations.