Microwave sintering of multiple aritcles Page: 6 of 18
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and element 4 in order to facilitate assembly of the
sintering container and prevent reactions between
dissimilar materials. The ceiling of chamber 1 is formed
by ceiling layer 3 of insulating material and top layer 2
05 of zirconia rests upon ceiling insulating layer 3.
Figures 1 and 2 show the dimensions, in inches, of the
container used in the experimentation. Base layer 6 is 1.0
inch thick and vertical thickness may range from about 0.5
to about 2.0 inches. Zirconia floor layer 5 is 0.25 inch
10 thick and vertical thickness may range from about 0.125 to
about 0.25 inch. Ring 7 is 0.25 inch thick and horizontal
thickness may range from about 0.125 to about 0.375 inch.
The outside diameter of the ring in the experimental
container is 4.0 inches and the inside diameter is 3.5
15 inches. The planform of the container is square with the
length of a side being 5 inches. The horizontal thickness
of zirconia element 4, which surrounds ring 7, may range
from about 0.25 to about 2.5 inches. A circular container
planform may be used, in which case the horizontal
20 thickness of zirconia element 4 would be uniform. Ceiling
layer 3 is 0.5 inches thick and vertical thickness may
range from about 0.25 to about 1.5 inches. Top zirconia
layer 2 is 0.5 inch thick and vertical thickness may range
from about 0.25 to about 1.5 inches. The height of the
25 sintering chamber is determined by the height of the
articles to be sintered.
Twenty articles were placed in sintering chamber 1 and
the container was heated in air in a microwave cavity using
microwave radiation having a frequency of 2.45 GHz.
30 Microwave power was provided to the cavity from a 6
kilowatt variable power microwave generator via a
waveguide. The container was placed on a table which could
be raised or lowered within the cavity. Each article was
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Blake, R. D. & Katz, J. D. Microwave sintering of multiple aritcles, patent, December 31, 1992; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1389885/m1/6/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.