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莫来石柱晶的制备及形成机理
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武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉科技大学省部共建耐火材料与冶金国家重点实验室

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国家自然科学基金面上项目(51672194);973计划前期研究专项(2014CB6608027);湖北省科技支撑计划对外科技合作项目 (2013BHE002)。湖北省教育厅优秀中青年科技创新团队计划项目(T201602)。,


Synthesis and growth mechanism of elongated mullite
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The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology

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    摘要:

    以颗粒状莫来石(Al6Si2O13)粉为原料,以TiO2为添加剂,采用原位反应法经1 773 K反应5 h后制备了Al6Si2O13柱晶。在对合成过程热力学计算分析的基础上,研究了TiO2用量对合成试样中物相的组成、含量和显微结构的影响,并对柱晶的形成机理进行了探讨。结果表明,当TiO2的用量≥7 wt%时,试样中可以生成长度约为15.2 μm的Al6Si2O13柱晶。TiO2的引入使得Al6Si2O13的晶格发生了畸变并在试样中生成了一定量的液相,从而促进了Al6Si2O13颗粒的各向异性生长。

    Abstract:

    Elongated mullite (Al6Si2O13) was synthesized at 1 773 K for 5 h via an in-situ solid-reaction method using granular mullite powders as raw materials, and TiO2 as an additive. Based on thermodynamic analysis of the reaction process, the effects of TiO2 contents on the phase composition, phase contents and microstructure of synthesized samples were investigated, and the growth mechanism of elongated mullite was discussed. The results showed that elongated mullite with the length of 15.2 μm were formed for the sample with TiO2 contents ≥ 7 wt%. Lattice distortion of mullite and the formation of liquid phase in the sample with addition of TiO2 resulted in the anisotropic grain growth of mullite.

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邓先功,王军凯,张海军,李发亮,韩磊,张少伟.莫来石柱晶的制备及形成机理[J].稀有金属材料与工程,2018,47(S1):32~36.[Deng Xiangong, Wang Junkai, Zhang Haijun, Li Faliang, Han Lei, Zhang Shaowei. Synthesis and growth mechanism of elongated mullite[J]. Rare Metal Materials and Engineering,2018,47(S1):32~36.]
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  • 收稿日期:2017-05-23
  • 最后修改日期:2018-02-10
  • 录用日期:2018-02-12
  • 在线发布日期: 2018-10-22
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