Evolution of the Pore Size Distribution in Final-Stage Sintering of Alumina Measured by Small-Angle X-ray Scattering |
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Authors: | Susan Krueger Gabrielle G. Long David R. Black Dennis Minor Pete R. Jemian G. William Nieman Richard A. Page |
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Affiliation: | National Institute of Standards and Technology, Gaithersburg, Maryland 20899;Department of Materials Science, Northwestern University, Evanston, Illinois 60208;Southwest Research Institute, San Antonio, Texas 78228 |
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Abstract: | Small-angle X-ray scattering was used to follow the evolution of the pore size distribution during final-stage sintering of alumina and of alumina doped with 0.25 wt% magnesia. The volume-weighted (Guinier) results indicate that the effective size of the largest pores increases as the body goes from 97% to more than 99% dense. The surface-area-weighted (Porod) results show that the median size of the smallest pores decreases slightly over the same density range. Taken together, these data indicate that the pore size distribution becomes broader as final-stage densification proceeds. This was confirmed by a maximum entropy analysis, which was used to derive pore size distributions directly from the data. Finally, the evolution of the pore size distributions in alumina, with and without sintering aid, were compared. |
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Keywords: | alumina sintering pore size distribution X-ray magnesia |
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