電磁超音波法による固体材料の熱拡散率と気孔率の研究 : 第3報, 同時測定法に関する実験および検討

概要

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The objective of this study is to evaluate simultaneously the time dependence of the thermal diffusivity of carbon-carbon composites (C/C composites) and their porosity during heat treatment using the electromagnetic ultrasonic technique. The present report describes two kinds of experiments conducted to confirm the principle for simultaneous measurement of both the ultrasonic velocity (used to evaluate the porosity) and the thermal diffusivity at room temperature. For each material, the sample used in both experiments was identical. The ultrasonic velocity of type 304 stainless steel and its thermal diffusivity were 5.85km/s and 3.8mm^2/s with precisions of ±1.6% and ±8%, respectively. The ultrasonic velocity of a two-dimensional woven C/C composite and its thermal diffusivity were 2.86km/s and 4.8mm^2/s with precisions of±5.0% and ±8%, respectively. The results appear to indicate that the electromagnetic ultrasonic technique can measure the ultrasonic velocity and the thermal diffusivity simultaneously and that it is also applicable to C/C composites for the measurements.
社団法人日本機械学会の論文
1996-05-25