Processing and Application of Ceramics 2020 Volume 14, Issue 2, Pages: 173-180
https://doi.org/10.2298/PAC2002173S
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Preparation and properties of Zr2WP2O12 with negative thermal expansion without sintering additives
Shi Xin Wei (School of Physics and Microelectronics, Zhengzhou University, Henan, PR China)
Zhou Qiang (School of Physics and Microelectronics, Zhengzhou University, Henan, PR China)
Yan Xiaosheng (School of Physics and Microelectronics, Zhengzhou University, Henan, PR China)
Li Xingrui (School of Materials Science and Engineering, Zhengzhou University, Henan, PR China)
Zhu Bailin (State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, PR China)
Zirconium tungsten phosphate (Zr2WP2O12 denoted as ZWP) is a negative thermal
expansion material which can be used as filler in controlling the thermal
expansion coefficient of other materials. In this study, dense ZWP ceramics
without any additives was prepared via solid-state reaction method, by
milling the as-synthesized powder for different times and sintering at
1300°C. The influence of the milling time, i.e. reduced particle sizes, on
properties of the Zr2WP2O12 was investigated. The obtained samples were
characterized by X-ray diffraction (XRD) method, scanning electron microscopy
(SEM), thermal mechanical analysis (TMA), Raman spectroscopy and Vickers
hardness tester. The results showed that the milled powders have high
crystallinity with single phase orthorhombic structure. The ZWP ceramics
exhibits NTE property with high density. With the increase of milling time
the coefficient of thermal expansion changed from −2.607 × 10−6 1/K to −3.914
× 10−6 1/K. In addition, the grain sizes decrease and the relative density
and HV hardness of the obtained ceramics increase confirming that grinding is
an effective method to improve the performance of ZWP ceramics.
Keywords: Zr2WP2O12, negative thermal expansion, particle size, milling time, sintering