Trend and development of international research for high temperature fixed-pointsCHEN Gui-sheng National Institute of Measurement and Testing Teehnologe,Chengdu 610021, ChinaAbstract:There has been an urgent requirement for high performance fixed-point above the copper freezing point （1084.62℃）,in contact thermometry, non-contact thermometry and radiometry for a long term. With the discovery of high temperature metal （earbide）-earbon （M（C）-C） euteetie melting points, this requirement will soon be met. This paper briefly introduced the research project for high temperature metal （earbide）-earbon （M（C）-C） euteetie fixed- points in the world. The purpose of the research is to substitute the current definition of ITS-90 above the silver point（961.78℃） with a new definition, make uncertainty 5-10 times lower than oresent temoerature scale.[著者文摘]
Key words:ITS-90; Temperature scale; High performance fixed-point; Metal-carbon （M-C） eutectic points;Radiation thermometry; Calibration; Reproducibility; Uncertainty