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The speed of sound in graphite as a function of the size of the pores

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Conclusions

High-porosity graphite contains two regions in which the speed of the USO varies with the pore size. When the pores are small relative to the ultrasonic wavelength, the USO speed increases within increase in the pore diameter to about 400μ (ratio of the USO wavelength to the mean pore diameterλ/¯D=3–4) and then decreases.

The experimental results do not conflict with the analytically predicted relations between the USO speed on the one hand and the overall porosity, pore diameter variance, and Poisson's ratio for the intervening material on the other. The theoretical relation was calculated on the basis of MacKenzie's model of a porous material from the equations of the effective elastic moduli.

An analysis was made of the relation between the resistivity of the specimens and the size of the pores. The resistivity data obtained confirms, together with the known thermal conductivity data, the validity of the above hypothesis about the variation of the speed of the USO.

The results of this investigation can be used for a more precise determination of variations in the density and strength of graphite products.

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Authors
  1. G. A. Lushnikov
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  2. I. G. Popova
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  3. V. N. Mustafina
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  4. V. Ya. Tsarev
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Additional information

M. V. Krysenkova, V. Ya. Kotosonova, and P. S. Shchukin participated in the work.

Translated from Ogneupory, No. 5, pp. 55–59, May, 1974.

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Lushnikov, G.A., Popova, I.G., Mustafina, V.N. et al. The speed of sound in graphite as a function of the size of the pores. Refractories 15, 325–328 (1974). https://doi.org/10.1007/BF01284158

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  • DOI: https://doi.org/10.1007/BF01284158

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