Fixed-point crucible and fixed-point temperature generating apparatus and temperature calibration method using the crucible

摘要

A fixed-point crucible 1 comprises a carbon crucible with a fixed-point material of high melting point enclosed in the wall. The fixed-point material is a carbon-metal eutectic. The crucible 1 is disposed in a temperature-variable furnace 6, the temperature of the crucible 1 is increased and decreased by the temperature-variable furnace 6, the temperature of the cavity in the crucible 1 is measured with a thermometer 9 and the thermometer 9 is calibrated from the measured temperature variations. This enables fixed points at temperatures exceeding the melting point of copper to be achieved, thereby allowing highly accurately calibration of a thermometer used in high temperatures such as radiation thermometer, a thermocouple, and the like.