Investigation of WC-C peritectic high-temperature fixed point

WC-C peritectic (2749degC) fixed point was investigated to evaluate their potential of serving as high-temperature reference points in thermometry. Three WC-C fixed-point cells were constructed and the melting and freezing plateaus were evaluated by means of radiation thermometer. The repeatability of the melting temperature of WC-C peritectic in one day was 17 mK with the melting range of approximately 70 mK. The repeatability of the freezing temperature of WC-C peritectic was 21 mK with the freezing range of less than 20 mK. The WC-C cells were easily constructed, like metal-carbon eutectic cells, without any reaction with crucible. From these results, it is concluded that WC-C peritectic has more potential as high-temperature standards than TiC-C eutectic (2761degC).