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新型轻质隔热、透波Al-B-O 陶瓷的研究进展
任忆箫,向会敏,戴付志,周延春
航天材料及工艺研究所,先进功能复合材料技术重点实验室,北京 100076
摘要:
Al 5BO 9、Al 4B 2O 9等Al-B-O体系硼莫来石陶瓷具有低密度、低热导率、宽带隙等优异性能,在飞行器的隔热、透波、热密封等领域具有广泛的应用前景。本文系统介绍了这类新材料的结构、性能和制备方法。在理论计算方面,介绍了基于密度泛函理论的第一性原理计算对Al-B-O体系材料晶体结构、力学和热学性能的预测;实验方面,总结了固相反应、熔盐法、溶胶-凝胶法、热分解法和水热法等制备方法和力学、热学等实验结果,并讨论了该体系化合物的应用现状及未来发展方向。
关键词:  第一性原理  硼莫来石  Al-B-O体系  热学性能  介电性能
DOI:10.12044/j.issn.1007-2330.2020.01.001
分类号:TQ128+.3
基金项目:国家自然科学基金(Nos.51672064,U1435206)
Review on Recent Progress of Lightweight, Thermal Insulting and Wave Transparent Al-B-O Ceramics
REN Yixiao,XIANG Huimin,DAI Fuzhi,ZHOU Yanchun
Science and Technology on Advanced Functional Composite Laboratory,Aerospace Research Institute of Materials & Processing Technology,Beijing 100076
Abstract:
Boronmullite ceramics in Al-B-O system such as Al 5BO 9and Al 4B 2O 9 have superior properties,including low density,low thermal conductivity and wide band gap.They are promisingthe in applications including thermal protection,wave transparent and thermal sealing in hypersonic vehicles.In this paper, recent progress on structure,synthesis and properties of compounds in Al-B-O system were reviewed.Theoretically,first-principles calculation based on density functional theory(DFT) is introduced to predict the crystal structure,elastic and thermal properties of these materials.Experimentally,synthesis methods such as solid-phase reaction,high-temperature molten-salt method,sol-gel method and thermal decomposition method are summarized.The applications and perspective of these materials are also discussed.
Key words:  First principle  Boron-mullite  Al-B-O system  Thermal properties  Dielectric properties