Microwave Sintering of Nanophase Ceramics Without Concomitant Grain Growth Page: 3 of 20
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2
been prepared by Geitler about 10 years ago, Deformation of
Polycrystals: Mechanisms and Microstructures, N. Hansen et
al. eds (Riso National Laboratory, Roslalde, Norway 1981),
in which inert gas condensation of metal vapors is combined
with in situ collection and compaction of the ceramic
powders to produce nanocrystalline ceramics. These ceramics
have potentially important properties such as low sintering
temperatures and superplasticity. By nanocrystalline
materials, it is meant in this application, materials having
10 average grain sizes of 100 nanometers or less and preferably
grain sizes of 60 nanometers or less. Green body density of
ceramic nanocrystalline materials can approach 75% of
theoretical, but for most purposes densities of the fired
ceramic should be greater than about 90% of theoretical.
The invention consists of certain novel features and a
combination of parts hereinafter fully described,
illustrated in the accompanying drawings, and particularly
pointed out in the appended claims, it being understood that
various changes in the details may be made without departing
20 from the spirit, or sacrificing any of the advantages of the
present invention.
Brief Description of the Drawings
For the purpose of facilitating an understanding of the
invention, there is illustrated in the accompanying drawings
a preferred embodiment thereof, from an inspection of which,
when considered in connection with the following
description, the invention, its construction and operation,
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Eastman, Jeffrey A.; Sickafus, Kurt E. & Katz, Joel D. Microwave Sintering of Nanophase Ceramics Without Concomitant Grain Growth, patent, April 15, 1991; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1317274/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.