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| Structure and Thermophysical Properties of Sm2(Zr1-xTix)2O7 Ceramic Materials |
| Received:August 27, 2018 Revised:January 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.01.009 |
| KeyWord:thermal barrier coating material Sm2Zr2O7 solid state reaction pyrochlore structure TiO2 doping thermal conductivity |
| Author | Institution |
| JIANG Tao |
lnner Mongolia University of Science and Technology, Baotou , China |
| SONG Xi-wen |
lnner Mongolia University of Science and Technology, Baotou , China |
| XIE Min |
lnner Mongolia University of Science and Technology, Baotou , China |
| WU Xiu-hong |
lnner Mongolia University of Science and Technology, Baotou , China |
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| Abstract: |
| Objective To explore the effects of dopping of TiO2 oxide to Sm2Zr2O7 on B site on structure and thermal physical property of Sm2Zr2O7. Methods Sm2(Zr1?xTix)2O7 (x=0, 0.2, 0.4, x is mole fraction) ceramic materials doped with Sm2Zr2O7 with transition metal oxide TiO2 were prepared by high temperature solid phase synthesis with Sm2O3, ZrO2 and TiO2 as raw materials. X-ray diffractometry (XRD) and scanning electron microscopy (SEM) were used to study the phase structure and microscopic morphology of ceramic materials. The Archimedes principle was used to determine the bulk density of ceramic materials. The heat capacity of materials was calculated according to Neumann–Kopp's law. The thermal expansion properties and thermal conductivity of materials were characterized by high temperature thermal dilatometer and laser thermal conductivity meter. Results The Sm2(Zr1?xTix)2O7 system ceramic material was a cubic pyrochlore structure with dense microstructure and clear grain boundaries. Sm2Zr2O7 was doped with a small ionic radius Ti4+, which resulted in the improvement of thermal expansion coefficient and the decrease of the thermal diffusivity, exhibited an extremely low thermal conductivity similar to glass at high temperature. At 800 ℃, the thermal conductivity of Sm2Zr1.6Ti0.4O7 was 1.29 W/(m?K), and the average thermal expansion coefficient was 10.6×10?6 K?1. Conclusion Since the atomic weight difference between the matrix atom and the substituted atom gradually decreases as the Ti doping amount increases, the thermal conductivity increases as the Ti doping amount increases. |
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