超音波波形解析による焼結体の不均質性の測定

概要

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The density of sintered materials becomes inhomogeneous partially because of the friction between the powder and the die during compaction. In this paper, we evaluate the inhomogeneity of the sintered materials by means of measurement of the ultrasonic wave velocity. It is shown that the ultrasonic wave velocity depends linearly on the density when the density variation is small. The relation between the density of the sintered copper and the ultrasonic wave velocity is determined by experiment, and the density distribution of the sintered materials is evaluated. The velocity and the attenuation also depend on the frequency of the wave and the powder diameter ; hence the powder diameter can be evaluated from the dependency of the velocity or of the attenuation on the frequency.
一般社団法人日本機械学会の論文
1993-11-25