共查询到19条相似文献,搜索用时 100 毫秒
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精密陶瓷凝胶注模成型工艺评述 总被引:14,自引:0,他引:14
陶瓷的成型和加工问题一直是困扰无机陶瓷材料应用的主要技术难点,也是陶瓷材料研究最为重要的课题之一。上世纪九十年代初发展起来的凝胶注模成型工艺,是一种近净尺寸陶瓷成型技术,它为解决陶瓷材料的加工成型问题提供了一条有效的工艺途径。本文简要介绍了陶瓷凝胶注模工艺和陶瓷浆料的基本组成,讨论了影响聚合反应速率、浆料流变性和陶瓷坯体性能的多种因素,并对陶瓷凝胶注模成型工艺的最新进展给予了评述。 相似文献
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压电陶瓷是一种可以实现机械信号和电信号相互转换的功能陶瓷。由压电陶瓷与有机相构成的复合材料具有不同的宏观连接方式, 这不仅决定了压电器件广泛的应用场合, 而且推动了压电陶瓷材料和器件多样化的成型技术发展。与传统成型技术相比, 增材制造技术的最大优势在于无需模具即可实现外形复杂的小批量样品快速成型, 这与多样化的压电陶瓷及其器件研发需求十分契合, 同时因其样品后续加工量少、原材料利用率高、无需切削液的特点, 得到了学术界和工业界的广泛关注。在陶瓷材料增材制造领域, 功能陶瓷和器件的研究仍在增长期。本文从不同增材制造技术角度, 探讨和对比现阶段无铅和含铅压电陶瓷增材制造的发展历史、原料制备、外形设计、功能特性检测及试样的应用, 并根据现阶段各增材制造技术的优、劣势对其未来进行了展望。 相似文献
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由于对陶瓷材料的性能要求的提高,传统的成型方法制备的陶瓷已经不能完全满足现代工业的需求,随着学科间交流的广泛,各种新的陶瓷成型工艺不断涌现。本文以制品形状为分类标准,综述了国内外目前研究活跃的多种干法成型、湿法成型方法,并讨论了今后陶瓷成型工艺的发展趋势。 相似文献
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近年来,增材制造技术作为一种新兴的制造技术受到了广泛关注。该技术在高性能陶瓷材料的成型制造领域具有巨大的发展潜力,有望突破传统陶瓷加工和生产的技术瓶颈,极大提升高性能陶瓷产品的设计和制备的自由度,从而为高性能陶瓷材料制造技术的发展提供变革性的推动力。前驱体转化陶瓷通过化学方法制得聚合物,再经热处理转化为陶瓷材料。聚合物前驱体充分利用了自身良好的可加工性特点,实现了目标结构的预成型,并通过热处理工艺获得传统陶瓷工艺难以获得的先进陶瓷材料。而聚合物前驱体材料与增材制造技术的结合更受到了极大关注。本文在介绍聚合物前驱体增材制造技术特点的基础上,系统阐述了聚合物前驱体增材制造技术的研究与应用前沿的现状与趋势,并分析了聚合物前驱体增材制造技术面对的挑战以及未来发展方向。 相似文献
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论述了陶瓷金相样品的制备和显微组织结构,介绍高性能陶瓷金相研究过程中的各个环节以及研究中的难点──样品浸蚀技术。目的在于了解、研究陶瓷组织的方法和陶瓷材料的组织学,为对陶瓷材料的综合研究和开发提供有价值的依据。 相似文献
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Ranga Komanduri 《Sadhana》1988,13(1-2):119-137
Cutting tools made of advanced ceramics have the potential for high-speed finish machining as well as for high-removal-rate
machining of difficult-to-machine materials. The raw materials used in these ceramics are abundant, inexpensive, and free
from strategic materials. In spite of this, solid or monolithic ceramic tools are currently used only to a limited extent
partly due to certain limitations of these materials and partly due to the inadequacy of the machine tools used. The advances
in ceramic materials and processing technology, the need to use materials that are increasingly more difficult to machine,
increasing competition, and the rapidly rising manufacturing costs, have opened new vistas for ceramics in machining applications.
The development of ceramic tool materials can be broadly categorized into three types: monolithic forms, thin coatings, and
whisker-reinforced composites. Such a classification provides a totally new perspective on ceramic tool materials and broadens
their scope considerably, and is justified on the basis that it is the ceramic addition that makes the tool material more
effective. A brief overview of these materials is presented in this paper. 相似文献
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From micro to nano: properties and potential applications of micro- and nano-filled polymer ceramic composites in microsystem technology 总被引:1,自引:0,他引:1
Hanemann T Boehm J Henzi P Honnef K Litfin K Ritzhaupt-Kleissl E Hausselt J 《IEE proceedings. Nanobiotechnology》2004,151(4):167-172
In microsystem technology, four important material classes are established either for the generation or the replication of microstructured surfaces: silicon, polymers, metals and ceramics. Composite materials consisting of a polymer matrix and ceramic fillers show improved thermomechanical properties in comparison to polymers and can be introduced as a new additional material class. The substitution of micro-sized ceramic fillers by nano-sized ceramics in composites has a strong influence on the composite's physical properties: the reduction of ceramic particle size down to the nanometre scale results in an improved sinter activity owing to the large surface area. The fabrication of dense ceramics is simplified and can be used for a rapid prototyping of microstructured ceramic parts. The addition of nano-sized ceramics with particle sizes of <40 nm to polymers allows the manufacturing of transparent polymer based composites with modified refractive indices for use in polymer waveguides. The influence of the ceramic particle size, the ceramic content and different dispersion methods on the composite's physical properties are discussed. 相似文献
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多孔陶瓷是一种新型功能材料,由于其具有气孔率高、耐高温、抗化学腐蚀、热稳定性好等优良性能,而被广泛应用于众多领域。本文总结了多孔陶瓷材料的分类方法和性能指标,介绍了多孔陶瓷的制备工艺和特点;并列举了多孔陶瓷在过滤器、催化剂载体、节能隔热材料、吸声材料和生物材料等方面的应用;最后展望了多孔陶瓷材料的发展前景。 相似文献
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通过梳理陶瓷领域的增材制造技术,并结合传统陶瓷的工艺过程及特点,探索增材制造技术对陶瓷器型创新的推进作用,并对未来发展趋势进行展望。基于陶瓷传统工艺过程,提炼传统器型的造型特点,就其存在的限制与问题进行分析;梳理目前陶瓷增材制造的技术发展脉络,探索不同增材制造技术的工艺特点及对陶瓷造型的影响,并结合陶瓷增材制造实例进行设计剖析,从创作方式和设计语言两方面阐述增材制造对于陶瓷器型的创新推进作用;最后对陶瓷增材制造技术进行未来展望。增材制造技术与陶瓷的结合,有力地推进了陶瓷器型的创新设计,使其突破了传统的设计限制,新的技术带来新的设计语言与创作形式,虽然目前仍处于发展阶段,但极具潜力。 相似文献
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《Current Opinion in Solid State & Materials Science》2017,21(6):323-347
3D printing, alongside the rapidly advancing field of porous ceramics, is quickly expanding the horizon of what is going to be possible in the future. In this paper, 3D printing technology is evaluated for its compatibility with porous ceramic materials, due to its competitive process in terms of speed and specific tooling, especially for good quality fabrication. The paper reviews the capabilities of these new technology techniques for the fabrication of porous ceramic. The basic technology is the 3D printing techniques, which are used to fabricate porous green ceramic parts that are later sintered. Different ceramic materials are evaluated and the classification of different powders according to their 3D printing quality as well as material aspects is examined. The evaluation of 3D printing process in terms of the powders’ physical properties such as particle size, flowability and wettability is also discussed. The relationship between the different 3D printing parameters and the final printing outcome are assessed. 相似文献
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同步提升陶瓷材料强度及损伤容限是陶瓷发展的核心问题。一百多年前预应力技术大幅提高混凝土和玻璃的弯曲强度, 并在世界上广泛应用以来, 预应力增强陶瓷材料的设计就成为一个百年梦想。本文总结了增强陶瓷的国内外研究进展, 并提出了全新的高强度高损伤容限复合陶瓷的预应力设计及模型, 通过优化表面预应力设计, 在陶瓷构件表面能够形成一层高度压缩应力, 从而阻止裂纹扩展, 并抵消外加拉应力, 达到提高陶瓷的强度及损伤容限的目的。这种预应力设计理论和规程可应用到结构陶瓷、建筑陶瓷和日用陶瓷等不同领域, 具有明显的通用性和广泛性, 且简单、经济, 不受构件尺寸和形状的限制, 因此极具应用前景。 相似文献
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H.-J. Sterzel 《Materialwissenschaft und Werkstofftechnik》1997,28(11):534-542
Powder injection moulding of ceramic parts Powder injection moulding is a parts production technology that combines the advantages of plastics injection moulding with the materials properties of ceramics. It makes possible the production of complex shaped parts for high production numbers. Almost all possibilities of parts design used in plastics injection moulding can transfered to ceramics. Paying attention to the special properties of highly filled thermoplastics and the well known rules for parts and tools construction, new parts can be realized in short development times. This article will have a closer look at the parameters for injection moulding, at rules for design of ceramic parts and the corresponding tools as well at a never debinding technology. 相似文献