| 钙钛锆石的自蔓延高温合成与热力学分析 |
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| 引用本文： | 张魁宝,冠军,尹丹,彭乐,滕元成,李玉香,张海斌. 钙钛锆石的自蔓延高温合成与热力学分析[J]. 原子能科学技术, 2016, 50(3): 418-423. DOI: 10.7538/yzk.2016.50.03.0418 |
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| 作者姓名： | 张魁宝 冠军 尹丹 彭乐 滕元成 李玉香 张海斌 |
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| 作者单位： | 1.西南科技大学 四川省非金属复合与功能材料重点实验室 省部共建国家重点实验室培育基地，四川 绵阳621010；2.西南科技大学 材料科学与工程学院，四川 绵阳621010；3.中国工程物理研究院 核物理与化学研究所，四川 绵阳621900 |
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| 基金项目： | 国家自然科学基金资助项目(51202203)；西南科技大学杰出青年科技人才支持计划资助项目(13zx9108) |
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| 摘 要： | 基于自蔓延高温合成法，采用Fe2O3、CrO3和Ca(NO3)2为氧化剂，Ti为还原剂制备了钙钛锆石。共设计了4个体系，计算了各体系的绝热温度，测量了各体系的实际燃烧温度，并探索了Ca(NO3)2为氧化剂时，TiO2与Ti摩尔比（TiO2∶Ti）对燃烧温度的影响。结果显示，所有体系均能自持发生，但以Fe2O3和CrO3为氧化剂时，产物的主要物相为烧绿石(Ca2Ti2O6)、Zr5Ti7O24、钙钛矿(CaTiO3)及少量TiO2，以Ca(NO3)2为氧化剂时，各体系的主要物相均为钙钛锆石(CaZrTi2O7)、CaTiO3及少量TiO2。同时，以Ca(NO3)2为氧化剂时，随TiO2∶Ti的降低，燃烧温度和绝热温度均逐渐升高。
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| 关 键 词： | 自蔓延高温合成 钙钛锆石 烧绿石 热力学 |
SHS of Zirconolite and Its Thermodynamic Analysis |
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| ZHANG Kui-bao,WEN Guan-jun,YIN Dan,PENG Le,TENG Yuan-cheng,LI Yu-xiang,ZHANG Hai-bin. SHS of Zirconolite and Its Thermodynamic Analysis[J]. Atomic Energy Science and Technology, 2016, 50(3): 418-423. DOI: 10.7538/yzk.2016.50.03.0418 |
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| Authors: | ZHANG Kui-bao WEN Guan-jun YIN Dan PENG Le TENG Yuan-cheng LI Yu-xiang ZHANG Hai-bin |
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| Affiliation: | 1.State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, China; 2.School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China; 3.Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China |
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| Abstract: | Zirconolite (CaZrTi2 O7 ) was prepared by self‐propagating high‐temperature synthesis (SHS) using Fe2 O3 ,CrO3 and Ca(NO3 )2 as the oxidants and Ti as the reduc‐tant .The adiabatic temperature was calculated ,and the combustion temperature was measured in this paper . The different molar ratios of TiO2 to Ti (TiO2 ∶ Ti) in the Ca(NO3 )2 reaction system were explored to investigate the combustion temperature of the designed SHS reactions .The results show that the SHS process can be sustained for all the designed reactions .However ,pyrochlore (Ca2Ti2O6 ) ,perovskite (CaTiO3 ) , Zr5 Ti7 O24 and trace of rutile (TiO2 ) were prepared using Fe2 O3 and CrO3 as the oxi‐dants .Zirconolite is successfully synthesized as the main phase with CaTiO3 and TiO2 as the minor phases when Ca(NO3 )2 is employed as the oxidant .The combustion tempera‐tures are much lower than the thermodynamically calculated adiabatic temperatures . Meanwhile ,the decrement of TiO2 ∶Ti is beneficial for the high adiabatic temperatures and combustion temperatures when using Ca(NO3 )2 as the oxidant . |
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| Keywords: | self-propagating high-temperature synthesis zirconolite pyrochlore ther-modynamics |
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