Study of Erosion Mechanisms of Engineering Ceramics.
Interim technical rept. no. 4, 1 Apr-31 Dec 75,
SOLAR SAN DIEGO CALIF
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A glass bonded alumina radome material Alsimag 614 was eroded under conditions which simulate a service environment. Natural occurring quartz in three particle size ranges 1-30 micrometers, 75-149 micrometers and 203-297 micrometers accelerated to velocities ranging from 30 to 313 msec. was used for the erosive media. The weight loss threshold for mega particle impacts was determined for the three particle size ranges. Although the threshold particle kinetic energy varied over 2 12 orders of magnitude, it was found that the threshold energy density was constant. Strength measurements before and after erosion revealed that a significant strength decrease did not occur under these conditions for material removal up to a depth of 50 microns. An electron microscopy examination of surfaces after both single particle impact and mega particle impact was performed. Observation revealed that the two phase nature of the target affects erosion response to such a degree that the models developed for erosion of isotropic, elastic surfaces are not applicable. The appearance of the surfaces indicated that flow of the glassy grain boundary phase occurred. Simplified calculations based on superimposed hydrostatic compression indicate that plastic flow of the glass is possible under these erosion test conditions. Author
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