The effects of thermal cycling on the physical and mechanical properties of [NZP] ceramics Page: 1 of 18
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THE EFFECTS OF THERMAL CYCLING ON THE PHYSICAL AND
MECHANICAL PROPERTIES OF [NZP] CERAMICS
T. B. Jackson and S. Y. Limaye
Salt Lake City, UT 84119
W. D. Porter
Oak Ridge National Laboratory
Metals and Ceramics Division
Oak Ridge, TN 37831
The [NZP] ceramics, sodium zirconium phosphate and its crystal structure analogs,
are noted for their very low thermal expansion characteristics. What has not been
widely studied is the effect of thermal cycling on physical and mechanical
properties. Two [NZP] compositional series were selected (Bai+,Zr4P6-2xSi2xO24
and Cal..,Sr1Zr4P6024) that exhibit varying bulk thermal expansion from positive
to negative and varying degrees of thermal expansion anisotropy. The effect of
thermal cycling, to 1250*C, on the bulk thermal expansion and flexural strength of
these ceramics will be discussed in relationship to changes in density, thermal
expansion anisotropy and microstructure.
Since the discovery of low thermal expansion properties of Nal,+Zr2P3-xSixOl2
type ceramics  there has been a tremendous amount of work done investigating
other related compositions for their low thermal expansion properties [2-5]. Two
compositional series have been discovered that have low bulk thermal expansion,
varying from positive to negative. Compositions within these series also have
varying degrees of thermal expansion anisotropy, and potential high useful
temperature ranges [6,7]. These two compositional series are
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Jackson, T.B.; Limaye, S.Y. & Porter, W.D. The effects of thermal cycling on the physical and mechanical properties of [NZP] ceramics, report, December 31, 1994; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc625384/m1/1/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.