高温合金精密铸造用陶瓷型芯成型技术研究进展

介绍了高温合金在航空发动机部件中的重要地位，以及高温合金熔模铸造用陶瓷型芯的应用背景，概述了陶瓷型芯成型技术的研究现状和重要意义。系统综述了先进陶瓷型芯成型技术的发展历史、特点及其最新研究进展，其中包括注射冷冻成型技术、无模成型技术、负复型技术以及充芯材料灌浆成型技术。重点介绍了立体光刻成型和三维打印成型等无模成型技术，并分析了目前无模成型技术所具有的独特优势和当前产业化所面临的问题与挑战。     

数字成型技术在陶瓷文创产品快速开发中的应用研究

随着技术的进步和成本的降低,近年来三维数字成型技术逐步在加工制造业被广泛应用。本文以三维数字建模与3D打印技术为基础,从多角度探讨了陶瓷文创产品快速开发的多种成型方式,并以PLA材料模种打印为手段进行了陶瓷文创产品快速开发案例分析,为数字信息时代下消费市场对陶瓷文创产品的快速开发需求提供了理论与实践基础。     

先进陶瓷快速无模成型方法研究的进展

介绍了快速无模成型的发展历史和特点,重点介绍了激光选区烧结成型（Selective Laser Sintering,SLS)、三维打印成型（3Dimensional Printing,3DP)、熔融沉积成型（Fused Deposition of Ceramics,FDC)、分层制造成型（Laminated Object Manufacturing,LOM)、立体光刻成型9Stereilithography,SL)、喷墨打印成型（Ink-jet Printing,I-JP）、选区凝胶成型（Selective Gelation,SG)和激光选区气相沉积成型（Selective Area Laser Deposition,SALD)等8种先进陶瓷的成型方法,并分析了目前该技术产业化所面临的一些问题。     

陶瓷3D打印技术研究进展

近年来随着社会科技的快速发展,在高性能陶瓷成型制造领域,3D打印技术具有广泛的发展前景,对于克服传统陶瓷加工和生产过程中遇到的技术瓶颈具有推进作用,有助于开辟陶瓷复杂零部件应用的新途径。本文针对近年来发展较快的光固化成型、选择性激光烧结、叠层实体制造技术等3D打印技术在陶瓷领域的研究进展进行分析,最后,总结出目前陶瓷3D打印技术所面临的困难与挑战。     

基于浆料形态的陶瓷3D打印技术的浆料体系研究进展

3D打印技术因其操作简单便捷、成型快速灵活、可制备复杂结构的器件等优点,在精密陶瓷零件制造方面具有广泛应用。本文根据3D打印陶瓷的材料形态综述不同3D打印技术在陶瓷制备方面的特点,重点介绍了陶瓷3D打印成型技术中直写式3D打印、光固化3D打印、喷墨3D打印等技术所涉及的粘结剂、分散剂等组分的应用及作用机理,并对水基和非水基两种类型的添加剂组分进行总结和探讨,以期为3D打印技术制备高性能陶瓷样件提供参考。     

陶瓷增材制造(3D打印)技术研究进展

高性能陶瓷是现代技术发展和应用不可或缺的关键材料。常规的陶瓷制造技术难以满足对个性化、精细化、轻量化和复杂化的高端产品快速制造的需求。新兴的增材制造技术(3D打印)在高性能陶瓷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,为陶瓷关键零部件的应用开辟新的途径。本文针对陶瓷材料及其快速成型和后处理工艺,重点阐述了三维打印技术、光固化成型技术、选择性激光烧结技术等主流陶瓷增材制造技术的研究现状,并指出了目前存在的问题及发展趋势。     

陶瓷部件的浆料打印快速成型

采用Sanders公司的四打印头快速成型机进行了陶瓷部件的浆料打印成型实验,实际测试了所用四打印头快速成型机的打印工作条件,考察了石蜡和挥发性介质两种浆料技术路线,并采用石蜡为介质制备了钛酸钡陶瓷浆料,研究了其流变性能,实验表明,虽然偶联剂的加入可以降低石蜡介质浆料的粘度,但是粘度足够低的可打印浆料的固相含量太低[约3％（in volume)以下],打印成型后不能完全烧结,因此,要通过打印成型出可完全烧结的陶瓷部件只能采用挥发液体作为浆料介质,以便在打印成型过程中通过介质挥发提高成型部件的固相含量。     

陶瓷增材制造

陶瓷的脆性和高硬度使得传统陶瓷成型工艺不易制备具有复杂形状和结构的陶瓷制件。本文总结了目前发展较快的激光选区熔融、激光选区烧结、三维打印、立体光固化、自由挤出成型等增材制造工艺在陶瓷领域的研究进展。面向复杂结构和高性能陶瓷制品的定制化快速制造需求,陶瓷增材制造技术展现出极大优势,在传统陶瓷行业、生物医疗等领域得到了应用。但是,陶瓷增材制造仍面临着打印材料及大尺寸、高致密度复杂结构陶瓷零件制造等难题,这些也将是增材制造技术未来发展的重要研究方向。     

陶瓷器件的快速原型制造技术研究进展

简要介绍了快速原型制造技术的发展历史和特点,对复杂结构陶瓷件快速成型技术,如分层实体制造、熔化沉积造型、选取激光烧结、三维印刷、喷墨打印等的工艺和特点进行了评述。并讨论了目前存在的问题及快速原型制造技术在陶瓷领域的发展方向。     

陶瓷喷墨打印成型技术进展

陶瓷喷墨打印成型技术是一种把计算机辅助制造(CAM)应用于陶瓷成型中的新技术.它是在计算机控制下多层打印逐层叠加制出三维陶瓷坯体.它在复杂单体陶瓷制造、有序成分复合材料制造,固体氧化物燃料电池制造等方面有很好的应用前景.本文概述了陶瓷喷墨打印技术的进展状况.着重介绍了该技术的历史原理设备和陶瓷墨水性能要求,以及现存的问题.     

陶瓷零件胶态快速成形技术研究新进展

按照使用陶瓷材料形态的差别将其分为陶瓷粉末快速成形与胶态快速成形两大类,而胶态成形由于成形精度高,可机械加工能力好等特点而备受关注。综述了近年来发展迅速、实用性强的几种陶瓷胶态快速成形技术。着重介绍了各种技术的成形方法和原理、工艺过程及研究现状等,通过比较分析了各种快速成形制造技术在陶瓷零件制造中的特点及其存在的问题,给零件成形时不同技术的选择提供了一些参考,并对胶态成形的进一步发展进行了分析和展望。     

Viscosity and Acoustic Behavior of Ceramic Suspensions Optimized for Phase-Change Ink-Jet Printing

The application of ink-jet printing technologies to direct-write and freeform fabrication of ceramics requires the development of appropriate printing fluids. The critical parameter controlling fluid printing ability is viscosity, although surface tension and density are also important. Additionally, in piezoelectric-driven ink-jets, drop ejection is governed by a series of electric pulses exciting a transducer at acoustic frequencies and hence the fluid acoustic wave speed is also important. Here, suspensions of sterically stabilized fine ceramic powders in solidifying hydrocarbon systems exhibiting suitable rheology for ink-jet printing have been formulated and their acoustic behavior has been characterized. For the particle sizes and frequencies used in this study, acoustic wave speed as a function of solids content is accurately predicted by effective medium theory. Suspensions containing up to 45% particulate by volume can be successfully passed through conventional printing heads.     

Freeform fabrication of ceramics

Abstract

Fabrication of ceramic objects by solid freeform fabrication (SFF) techniques is reviewed, with emphasis on ceramic versions of commercial rapid prototyping (RP) methods. A wide range of ceramics have been demonstrated, including aluminium oxide, silica, hydroxyapatite, silicon nitride, and lead zirconate titanate, with techniques based on extrusion, ink jet deposition, green tape lamination, and photopolymerisation. The quality of SFF ceramics compares well with conventionally processed ceramics.     

Solid Freeform Fabrication of Thin-Walled Ceramic Structures Using an Electrohydrodynamic Jet

A printing device, which operates on an electrohydrodynamic principle, was used to deposit 100 layers of a 10 vol% zirconia suspension. Thus, a wall ∼100 μm in thickness was freeformed. The wall thickness achieved in this work is almost 30% less than that of similar structures built by ink-jet printing and therefore we demonstrate a novel print deposition based solid freeform fabrication method, which can be developed further for preparing fine ceramic structures.     

A review of 3D printed porous ceramics

Three-dimensional (3D) printing of ceramics has gained widespread attentions in recent years. Many excellent reviews have reported the printing of ceramics. However, most of them focus on printing of dense ceramics or general ceramic aspects, there is no systematical review about 3D printing of porous ceramics. In this review paper, the 3D printing technologies for fabricating of porous ceramic parts are introduced, including binder jetting, selective laser sintering, direct ink writing, stereolithography, laminated object manufacturing, and indirect 3D printing processes. The techniques to fabricate hierarchical porous ceramics by integrating 3D printing with one or more conventional porous ceramics fabrication approaches are reviewed. The main properties of porous ceramics such as pore size, porosity, and compressive strength are discussed. The emerging applications of 3D printed porous ceramics are presented with a focus on the booming application in bone tissue engineering. Finally, summary and a perspective on the future research directions for 3D printed porous ceramics are provided.     

Rapid thermal cycling with low thermal inertia tools

Solid freeform fabrication processes offer the manufacturing flexibility for tools with low thermal inertia and internal conformal channels for rapid thermal cycling in injection molding. This article analyzed each step of a rapid thermal cycling process and provided quantitative guidance for tooling design. The proposed design methodology was tested on a three‐dimensional (3D) printed benchmark tool with truss support. Rapid cooling test on the benchmark tool resulted in the mold time constant shorter than 2.3 s and the cavity temperature uniformity better than 3°C. Preliminary tests demonstrated the technical feasibility of using a solid freeform fabrication process to fabricate low thermal inertia tools for improved heat management in injection molding. POLYM. ENG. SCI., 2009. © 2008 Society of Plastics Engineers     

An experimental analysis of the influence of the ink properties on the drop formation for direct thermal inkjet printing of high solid content aqueous 3Y-TZP suspensions

Direct inkjet printing (DIP) of ceramics as a novel solid freeform fabrication (SFF) method has been subjected to extensive research in the recent years. The studies have focused either on the simulation of the drop ejection or the production of demonstration objects. The aim of this study was to close the gap between the simulation results and product oriented studies. 3Y-TZP inks of 24 vol.% solid content were prepared and characterized in terms of physical properties as well as dimensionless quantities (Re, We, Ca, and Oh). The drop volume and velocity were estimated by considering a constant ejection pressure but varying physical properties of the ejected inks. A thermal inkjet printer was used to eject arrays of single drops as well as three-dimensional 3Y-TZP demonstration objects. The drop arrays were analyzed to determine the relation between the ink properties and the drop formation. The demonstration object was sintered close to the full density.     

3D printing of ceramics: A review

Along with extensive research on the three-dimensional (3D) printing of polymers and metals, 3D printing of ceramics is now the latest trend to come under the spotlight. The ability to fabricate ceramic components of arbitrarily complex shapes has been extremely challenging without 3D printing. This review focuses on the latest advances in the 3D printing of ceramics and presents the historical origins and evolution of each related technique. The main technical aspects, including feedstock properties, process control, post-treatments and energy source–material interactions, are also discussed. The technical challenges and advice about how to address these are presented. Comparisons are made between the techniques to facilitate the selection of the best ones in practical use. In addition, representative applications of the 3D printing of various types of ceramics are surveyed. Future directions are pointed out on the advancement on materials and forming mechanism for the fabrication of high-performance ceramic components.     

Novel Powder-Processing Methods for Advanced Ceramics

Novel approaches for optimized powder processing of advanced ceramics are reviewed with an emphasis on direct-casting methods and solid freeform fabrication techniques. The fundamental principles for green body formation are discussed; a distinction is made between physical and chemical gels based on the nature of the induced gelation. An overview of the properties of dense suspensions is presented, with a focus on the factors controlling the maximum solids loading. Recent work on direct measurements of interparticle forces in ceramic systems is presented and related to rheological properties.     

Direct ink writing of cordierite ceramics with low thermal expansion coefficient

Since the application of cordierite ceramics is limited by the disadvantages of traditional preparation techniques, 3D printing technology provides the only choice for the rapid preparation of cordierite ceramics with highly complex structures. In this work, the fabrication of cordierite ceramics with complex structures was achieved by direct ink writing. The near-net-shape of cordierite ceramics was realized by the volume expansion caused by the phase transformation. A cordierite ceramic with an average shrinkage rate of 1.58 % was obtained at 1400 °C. The low shrinkage avoids design and manufacturing procedures carried out for dimensional and alignment errors. In addition, the coefficient of thermal expansion was as low as 1.69 × 10^?6 °C^?1. The effect of configuration on the thermal behavior of cordierite ceramics is understood by analyzing the phase composition and microstructure. The cordierites ink reported in this work offers additional possibilities for the production of novel complex structures.