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纳米陶瓷及其发展趋势 总被引:6,自引:0,他引:6
纳米陶瓷改变了传统陶瓷的脆性,大幅度提高了材料的强度、韧性和超塑性,同时对传统陶瓷材料的电学、热学、磁学、光学等性能产生了重要影响。本文综述了纳米陶瓷的性能以及发展趋势。 相似文献
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陶瓷材料作为材料的三大支柱之一,在日常生活及工业生产中起着举足轻重的作用。但是,由于传统陶瓷材料质地较脆,韧性、强度较差,因而使其应用受到了较大的限制。随着纳米技术的广泛应用,纳米陶瓷随之产生,希望以此来克服陶瓷材料的脆性,使陶瓷具有象金属一样的柔韧性和可加工性。英国材料学家Cahn指出纳米陶瓷是解决陶瓷脆性的战略途径。 相似文献
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1前言纳米陶瓷材料是当前材料科学研究的前沿热点领域,制备纳米陶瓷材料的首要问题是研制出符合要求的纳米陶瓷粉末。目前.大规模生产非氧化物陶瓷粉末的主要方法是低热还原法。为了生产高纯、超细的产品,又要降低合成温度,缩短合成时间,以期节省能源.降低成本等,就必须 相似文献
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中国结构陶瓷研究的进展及其应用前景 总被引:21,自引:0,他引:21
本文简要评述了中国结构陶瓷的发展历程,着重评述了近年来中国结构陶瓷的研究进展与现状,指出中国结构陶瓷研究应遵循的三个方向:多相复合陶瓷、陶瓷材料的剪载与设计、纳米陶瓷,并展望了结构陶瓷的应用前景。 相似文献
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陶瓷材料作为材料的三大支柱之一,在日常生活及工业生产中起着举足轻重的作用。随着纳米技术的广泛应用,纳米陶瓷随之产生,使陶瓷具有象金属一样的柔韧性和可加工性。针对神奇的纳米技术孕育着技术变革,分析了纳米陶瓷的性能特点,介绍了纳米技术在陶瓷领域的应用,研究了纳米陶瓷的制备,同时指出了高性能陶瓷与纳米陶瓷的发展趋势。 相似文献
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《Ceramics International》2022,48(20):30224-30228
High densification and fine grain size are the key to achieve excellent mechanical properties of ceramic materials. Pressure-assisted sintering is an effective approach to achieve this goal. However, the pressure at different sintering stages has different effects on the densification behavior of nano-ceramics. In this work, it is found that adjusting the pressure applying regime during Spark Plasma Sintering of nano-alumina ceramics can effectively increase the densification rate and balance the relationship between the densification behaviors of particle coarsening, grain growth and vapor migration. When the pressure is applied at the beginning of the second sintering stage, the high densification and fine grain size microstructures can be both obtained at lower temperatures, leading to the best mechanical properties. This result is of great significance for the preparation of nano-ceramics with excellent mechanical properties. 相似文献
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微米级多孔陶瓷的研究 总被引:2,自引:0,他引:2
本研究以石英和长石为主要原料,通过控制石英和长石的粒度和配比,研制出一种高强度的微米级多孔陶瓷,并讨论了管料粒径和烧成温度与其性能之间的关系。 相似文献
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Eugene Medvedovski 《International Journal of Applied Ceramic Technology》2023,20(2):612-659
The applications of advanced ceramics, composites and coatings in mineral, mining, fuel production, and processing are reviewed. The materials include oxide and non-oxide ceramics (specifically SiC-based), ceramic–ceramic, and ceramic–metal composites, coatings on metallic components where functional application properties can be achieved. Some principles of materials selection, specifically for erosion wear and corrosion applications, and manufacturing are considered. The examples of the successful development and processing of ceramics, coatings, and composites with manageable structures and phase compositions, in the erosion-related applications, particularly conducted by the author, are discussed and reviewed. Specifically, industrially employed types of ceramics and processing routes were focused on the considered applications. Particular demands for advanced materials with high reliability and complex shapes or for protective coatings on complex shape steel components and long tubing with inner surface protection require novel and optimized processing. The factors affecting erosion and erosion–corrosion resistance and the paths for the erosion resistance enhancement of ceramic and coating materials are considered. Ceramic components design, technology, and installation features are reviewed. 相似文献
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自蔓延高温合成(self-propagating high-temperature synthesis,SHS)是一种在数秒~几十秒内即可完成的合成技术,但是直接产物是多孔状的.在SHS产物还处于高温软化状态时立即快速加压(quick pressing,QP),可以一步实现合成和致密化获得致密材料,这一技术被称为SHS/QP技术.传统的高温烧结的致密化过程主要靠原子扩散实现,SHS/QP过程如此之快,其致密化机理尚不明确.为此,探讨了SHS/OP技术制备金属陶瓷和复相陶瓷的致密化机理.研究了SHS/OP技术制备金属陶瓷、复相陶瓷和叠层复合材料的结构和工艺过程,并制备了密实材料.结果表明:基于塑性变形机理,SHS/QP技术能制备出密实、晶粒基本不长大的纳米陶瓷. 相似文献
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多孔陶瓷热导率的影响因素及其有效热导率的数值计算方法 总被引:1,自引:0,他引:1
多孔陶瓷因具有孔隙率高、体积密度小、比表面积大等独特的表面物理特性而被广泛应用于保温材料、炉膛材料、热障涂层材料、高温烟气过滤材料等,研究多孔陶瓷导热机制并给出其有效热导率的计算方法既是重点又是难点。本文总结了国内外研究的多孔陶瓷热导率的影响因素,概述了多孔陶瓷有效热导率的计算方法,并重点分析了不同显微结构的不同计算方法。针对不同的应用领域对材料热导率的不同要求,提出通过控制显微结构控制热导率是今后多孔陶瓷热导率研究得发展趋势。 相似文献