<報文>熱流束型示差走査熱量計による Ni および TiAl の比熱測定

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The specific heats of nickel and Ti-Al intermetallic compounds have been determined by using the heat-flux type differential scanning calorimetry (Heat-flux type DSC) as a function of temperature in the temperature range of 600 to 1425K. The specific heat of nickel was obtained within the uncertainty of ±3 percent and the error of ±10% was suggested for the measurements of Ti-Al intermetallic compounds. The increase in error for Ti-Al intermetallic compounds is mainly arising from a condition that the sufficient amount of the sample is not available. The heat-flux type DSC has some advantages; analysis time is short, a small amount of the sample weight is required in comparison to the dropping calorimetry case and one cycle measurement covers in the wide temperature range. The following results were obtained : Ni : Cp (J・mol^<-1>・K^<-1>)=(1.2±8.5)+(21.9±4.9)×10^<-3>T+(9.3±3.5)×10^6×T^<-2> (from 920 to 1425K) TiAl : Cp (J・mol^<-1>・K^<-1>)=(48.7±6.6)+(13.3±5.4)×10^<-3>T-(1.5±1.1)×10^6×T^<-2> (from 470 to 1425K) Ti_3Al : Cp (J・mol^<-1>・K^<-1>)=(123.3±30.9)+(33.5±27.7)×10^<-3>T-(5.2±4.4)×10^6×T^<-2> (from 470 to 1075K)Heat-Flux Type DSCSpecific HeatTiAlTi_3Al
東北大学の論文
2002-03-01