Title :
Metal Carbide-Carbon Eutectic and Peritectic Fixed Points as High-Temperature Standards
Author :
Sasajima, Naohiko ; Yamada, Yoshiro ; Wang, Yunfen
Author_Institution :
AIST, Nat. Metrol. Inst. of Japan, Tsukuba
Abstract :
TiC-C eutectic and WC-C peritectic systems were investigated for their potential of serving as high-temperature reference points in thermometry. Mixtures of high-purity graphite powder with Ti and W were filled in graphite crucibles and melting/freezing plateaus were observed by means of a radiation thermometer. The observed melting range of WC-C peritectic was roughly 0.1 K with repeatability of 0.02 K. The melting range of TiC-C eutectic was roughly 0.5 K with repeatability of 0.09 K. The freezing curve of TiC-C showed a sharp peak after recovery from supercool, followed by a gently-sloped curve, probably due to composition of eutectic ingot or impurities. WC-C peritectic seems to have more potential as high-temperature standards, although it is still at a preliminary stage of investigation
Keywords :
decomposition; freezing; graphite; impurities; melting; phase diagrams; powders; thermometers; titanium compounds; tungsten compounds; TiC-C; WC-C; graphite powder; high-temperature reference points; high-temperature standards; melting-freezing plateaus; metal carbide-carbon eutectic fixed points; metal carbide-carbon peritectic fixed points; mixtures; phase diagrams; radiation thermometer; thermometry; Furnaces; Impurities; Metrology; Optical wavelength conversion; Photometry; Powders; Radiometry; Solids; Temperature distribution; Uncertainty; Fixed points; High-temperature standard; Metal-carbon eutectic; Peritectic; Radiation thermometry;
Conference_Titel :
SICE-ICASE, 2006. International Joint Conference
Conference_Location :
Busan
Print_ISBN :
89-950038-4-7
Electronic_ISBN :
89-950038-5-5
DOI :
10.1109/SICE.2006.315281
