Polymer Derived Ceramics with Negative Thermal Expansion Fillers: Zirconium Tungstate

2019 ◽  
Vol 21 (6) ◽  
pp. 1900116 ◽  
Author(s):  
Anna Fedorova ◽  
Michael Scheffler
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Zirconium Tungstate ◽  
Polymer Derived Ceramics

High Temperature Stability of Zirconium Tungstate

2020 ◽  
Vol 993 ◽  
pp. 771-775
Author(s):  
Ping Zhai ◽  
Xiao Feng Duan ◽  
Da Qian Chen
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Solid Phase ◽  
Coefficient Of Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Tungstic Acid ◽  
High Temperature Stability ◽  
Zirconium Tungstate

In this paper, zirconium tungstate ceramic with negative thermal expansion coefficients was prepared from zirconium oxide and tungstic acid by solid phase synthesis and high temperature quenching technique with a sintering temperature of 1200 °C. The phase structure of the material was determined by X ray and the thermal expansion coefficient was measured by dilatometer, while the TG-DTA analysis of the prepared material was also carried out. The results showed that zirconium tungstate with high purity could be obtained by rapid chilled while fired at 1200 °C. The coefficient of thermal expansion at 300 °C was minus 8.5413 × 10-6K-1, which is identical with the theoretical value. The thermal expansion coefficient of the material was negative fired lower than 750 °C, while it was positive fired higher than 750 °C, and this indicates that the decomposition temperature of zirconium tungstate is about 750 °C.

Negative thermal expansion in a zirconium tungstate/epoxy composite at low temperatures

2013 ◽  
Vol 49 (1) ◽  
pp. 392-396 ◽  
Author(s):  
Lauren A. Neely ◽  
Vladimir Kochergin ◽  
Erich M. See ◽  
Hans D. Robinson
Keyword(s):  
Thermal Expansion ◽  
Low Temperatures ◽  
Epoxy Composite ◽  
Negative Thermal Expansion ◽  
Zirconium Tungstate

Zirconium tungstate reinforced cyanate ester composites with enhanced dimensional stability

2009 ◽  
Vol 24 (7) ◽  
pp. 2235-2242 ◽  
Author(s):  
Prashanth Badrinarayanan ◽  
Ben Mac Murray ◽  
Michael R. Kessler
Keyword(s):  
Thermal Expansion ◽  
Dimensional Stability ◽  
Coefficient Of Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Thermomechanical Analysis ◽  
Dynamic Mechanical Properties ◽  
Filler Loading ◽  
Cyanate Ester ◽  
Scanning Calorimetry ◽  
Zirconium Tungstate

Zirconium tungstate (ZrW2O8) is a unique ceramic material characterized by isotropic negative thermal expansion behavior over a wide temperature range. Incorporation of ZrW2O8 is expected to improve the dimensional stability of polymers by reducing the overall coefficient of thermal expansion (CTE). In this work, the thermal and dynamic mechanical properties of a bisphenol E cyanate ester reinforced with various loadings of ZrW2O8 are examined. Thermomechanical analysis indicates that the incorporation of ZrW2O8 results in a decrease in CTE at temperatures above and below the glass transition temperature (Tg) of the neat resin. The dynamic storage moduli of the composites reinforced with ZrW2O8 are found to increase with increasing filler loading. Furthermore, the various phase behaviors exhibited by ZrW2O8 are also examined by differential scanning calorimetry measurements.

Monocrystal Elastic Constants of the Negative-Thermal-Expansion Compound Zirconium Tungstate (ZrW2O8)

2004 ◽  
Vol 93 (2) ◽  
Author(s):  
F. R. Drymiotis ◽  
H. Ledbetter ◽  
J. B. Betts ◽  
T. Kimura ◽  
J. C. Lashley ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Elastic Constants ◽  
Negative Thermal Expansion ◽  
Zirconium Tungstate
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