Abstract
This paper reports results on the elastic anisotropy of four different plasma‐sprayed, free‐standing oxide ceramics, obtained by applying an ultrasonic phase spectroscopy technique suitable to measure wave velocities along relatively short pathlengths in extremely porous, strongly attenuating ceramic materials. The as‐sprayed materials are clearly anisotropic, showing a considerably lower stiffness perpendicular to the substrate plane than in directions parallel to that plane. Upon annealing, the materials gradually become more isotropic. It is concluded that the anisotropy is governed by interlamellar, slitlike pores which are formed during the spray‐deposition process and which are aligned preferentially parallel to the substrate surface. Upon annealing, these pores shrink and adopt a more spherical shape, thus reducing the anisotropy.
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