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Separation of thermoviscous losses in ceramica)
a)Portions of this work were presented at the 143rd Meeting of the Acoustical Society of America held in Pittsburgh, PA on 6 June 2002 and the abstract for that talk was printed in the Journal of the Acoustical Society of America, volume 111, No. 5, Part 2, May, 2002.
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Image of FIG. 1.
FIG. 1.

Schematic representation of the cell structure of ceramic with an expanded view of a portion of cell wall illustrating the porous nature of the ceramic wall surface. Photomicrographs of actual cell walls are shown in Fig. 2.

Image of FIG. 2.
FIG. 2.

Comparison of the surface of the walls of the pores before and after coating using the in situ polymerization technique described in the text. The two vertical lines are adjacent cell walls which are separated by a distance of .

Image of FIG. 3.
FIG. 3.

Schematic diagram of the resonator, transducer, and spectrum analyzer used to make measurements on a coated and uncoated Celcor sample. Resonator dimensions are not drawn to scale.

Image of FIG. 4.
FIG. 4.

Mode shape and lumped element (mass-spring) representation of the first two plane wave modes of the resonator with perfectly rigid boundary conditions at both ends.

Image of FIG. 5.
FIG. 5.

Quality factors divided by the square-root of mode number for the empty resonator as measured and calculated by DELTAE.

Image of FIG. 6.
FIG. 6.

Squares: the change in resonance frequency relative to the resonance frequency of the empty resonator, , after the Celcor sample was inserted. Triangles: the frequency difference relative to DELTAE prediction for the resonator with uncoated Celcor sample .

Image of FIG. 7.
FIG. 7.

Squares: relative change in measured quality factor compared to the empty resonator after the uncoated Celcor sample was inserted in the resonator, . Triangles: quality factor of the resonator containing the uncoated Celcor sample compared to the DELTAE prediction .

Image of FIG. 8.
FIG. 8.

Comparison of the relative frequency shift of coated and uncoated sample to DELTAE prediction.

Image of FIG. 9.
FIG. 9.

Quality factor for the resonator with the coated and uncoated Celcor sample.


Generic image for table

Summary of the measured resonance frequency and the quality factor of the first seven modes for the empty resonator, the resonator with uncoated sample, and the resonator with coated sample.


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Scitation: Separation of thermoviscous losses in CelcorTM ceramica)