| 姜涛,宋希文,谢敏,吴秀红.Sm2(Zr1-xTix)2O7陶瓷材料的结构及热物理性能[J].装备环境工程,2019,16(1):47-52. JIANG Tao,SONG Xi-wen,XIE Min,WU Xiu-hong.Structure and Thermophysical Properties of Sm2(Zr1-xTix)2O7 Ceramic Materials[J].Equipment Environmental Engineering,2019,16(1):47-52. |
| Sm2(Zr1-xTix)2O7陶瓷材料的结构及热物理性能 |
| Structure and Thermophysical Properties of Sm2(Zr1-xTix)2O7 Ceramic Materials |
| 投稿时间：2018-08-27 修订日期：2019-01-25 |
| DOI：10.7643/ issn.1672-9242.2019.01.009 |
| 中文关键词: 热障涂层材料 Sm2Zr2O7 固相反应 烧绿石结构 TiO2掺杂 热导率 |
| 英文关键词:thermal barrier coating material Sm2Zr2O7 solid state reaction pyrochlore structure TiO2 doping thermal conductivity |
| 基金项目:国家自然科学基金（51762036） |
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| 中文摘要: |
| 目的 研究氧化物TiO2 B位掺杂对Sm2Zr2O7陶瓷材料的结构及热物理性能的影响。方法 以Sm2O3、ZrO2、TiO2为原料，通过高温固相合成法制备用过渡金属氧化物TiO2掺杂 Sm2Zr2O7的Sm2(Zr1?xTix)2O7 （x=0,0.2,0.4, x为摩尔分数）陶瓷材料。利用 X 射线衍射仪（XRD）、扫描电子显微镜（SEM）研究陶瓷材料的物相结构以及显微形貌，利用阿基米德原理测定陶瓷材料的体积密度。根据Neumann-Kopp 定律计算材料热容，采用高温热膨胀仪及激光导热仪对材料的热膨胀性能和热导率进行表征。结果Sm2(Zr1?xTix)2O7体系陶瓷材料为立方烧绿石结构，显微结构致密，晶界清晰。Sm2Zr2O7 掺杂小离子半径Ti4+使其热膨胀系数有所提高，热扩散系数降低，并在高温下表现出类似于玻璃的超低热导率。800 ℃时，Sm2Zr1.6Ti0.4O7的热导率为1.29 W/(m?K)，平均热膨胀系数达到10.6×10?6 K?1。结论 由于基质原子与取代原子之间的原子量差随Ti掺杂量的增加而逐渐降低，其热导率随Ti掺杂量增加而升高。 |
| 英文摘要: |
| 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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