Thermal Expansion Reduction in Alumina‐Toughened Zirconia by Incorporation of Zirconium Tungstate and Aluminum Tungstate. Issue 9 (20th June 2015)

• Record Type: Journal Article
• Authors: Romao, Carl P.; Marinkovic, Bojan A.; Werner‐Zwanziger, Ulrike; White, Mary Anne; Parthasarathy, T.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 9(2015)
• Page Start: 2858
• Page End: 2865
• Publication Date: 2015-06-20
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13675
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13675-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>A series of composites containing yttria‐stabilized zirconia, Al₂O₃, and the thermomiotic (negative thermal expansion) materials ZrW₂O₈ and Al₂W₃O₁₂ were prepared by an <italic>in situ</italic> solid‐state reaction during sintering. Microstructural analysis of the composites indicated several sub‐micron sized components. ²⁷Al MAS NMR was used to characterize the aluminum‐containing phase distribution. Measurement of the coefficients of thermal expansion showed that the addition of thermomiotic components reduced the thermal expansivity of the alumina‐toughened zirconia matrix, but the reduction was considerably smaller than what would be predicted by the rule of mixtures. The Turner model was much more accurate in predicting the coefficients of thermal expansion of the composites due to the large differences in stiffness between the components.</p> </abstract>