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Phase transition features of binary Co-C eutectic temperature fixed-point

이원계 Co-C 공정계 온도 고정점의 특성

  • Kim, Yong-Gyoo (Temperature-Humidity Group, Div. of Physical Metrology, Korea Research Institute of Standards and Science (KRISS)) ;
  • Yang, In-Seok (Temperature-Humidity Group, Div. of Physical Metrology, Korea Research Institute of Standards and Science (KRISS)) ;
  • Gam, Kee-Sool (Temperature-Humidity Group, Div. of Physical Metrology, Korea Research Institute of Standards and Science (KRISS))
  • 김용규 (한국표준과학연구원 물리표준부 온습도그룹) ;
  • 양인석 (한국표준과학연구원 물리표준부 온습도그룹) ;
  • 감기술 (한국표준과학연구원 물리표준부 온습도그룹)
  • Published : 2005.11.30

Abstract

A Co-C eutectic cell for thermocouple calibration was manufactured and tested to investigate its phase transition characteristics using Type B thermocouples. It was observed that the freezing plateaus were flatter than those of melting, but the melting points were closer to the true transition temperature than the freezing points. The expanded uncertainty of melting temperature was calculated not to exceed $0.2^{\circ}C$ (k = 2). Based on the observed results, the melting process is recommended for the calibration of thermocouples.

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