Artigos de revistas: "Ceramic shaping"

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Höpfel, Heiko, e Wulf Pfeiffer. "Shaping of Ceramics Using Residual Stresses". Materials Science Forum 768-769 (setembro de 2013): 478–83. http://dx.doi.org/10.4028/www.scientific.net/msf.768-769.478.

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Shot peening is a common procedure used to improve the static and cyclic strength of metal components and for forming of thin walled components. The underlying mechanisms are localized plastic deformation, work hardening and the introduction of compressive stresses into the near-surface region. During the last decade we have been establishing damage-free shot peening processes for brittle materials such as ceramics. Based on these results we are now developing processes for peen-forming of ceramic components. This paper describes the first successful experiments aimed at shaping ceramic specimens using shot peening. Strips of different thicknesses, made of silicon nitride ceramic, were shot-peened using different shot sizes, peening pressures and coverage. The residual stress-depth distributions were determined using X-ray diffraction. Based on the experimentally determined stress states, the curvatures of the strips were calculated analytically and using Finite Element calculations (FEM). The results of the curvature measurements and calculations agree well.

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Kosakowsky, Laura J. "SHAPING CERAMIC RESEARCH AT THE MAYA SITE OF CUELLO, BELIZE". Ancient Mesoamerica 14, n.º 1 (janeiro de 2003): 61–66. http://dx.doi.org/10.1017/s0956536103132087.

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Traditional analyses of ceramics from Maya Lowland archaeological sites have focused on descriptive typologies to define site and regional chronologies. However, T. Patrick Culbert's groundbreaking work on the ceramics of Tikal (1993) utilized vessel shapes, as well, involving an analytical system of two levels: shape classes and shapes. His systematized modal analysis and concentration on vessel-shape classes, in conjunction with a focus on the importance of deposit types and site-formation processes, revolutionized what ceramics can tell us about prehistoric Maya behavior. The same approach was applied to the research on the Cuello ceramics presented here to gain a better understanding of the behavior associated with ceramic-vessel usage during the Preclassic period at this northern Belize site.

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Park, Ki Suk, Ralf Milke, Erik Rybacki e Sabine Reinhold. "Application of Image Analysis for the Identification of Prehistoric Ceramic Production Technologies in the North Caucasus (Russia, Bronze/Iron Age)". Heritage 2, n.º 3 (6 de agosto de 2019): 2327–42. http://dx.doi.org/10.3390/heritage2030143.

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The recent advances in microscopy and scanning techniques enabled the image analysis of archaeological objects in a high resolution. From the direct measurements in images, shapes and related parameters of the structural elements of interest can be derived. In this study, image analysis in 2D/3D is applied to archaeological ceramics, in order to obtain clues about the ceramic pastes, firing and shaping techniques. Images were acquired by the polarized light microscope, scanning electron microscopy (SEM) and 3D micro X-ray computed tomography (µ-CT) and segmented using Matlab. 70 ceramic sherds excavated at Ransyrt 1 (Middle-Late Bronze Age) and Kabardinka 2 (late Bronze–early Iron Age), located in in the North Caucasian mountains, Russia, were investigated. The size distribution, circularity and sphericity of sand grains in the ceramics show site specific difference as well as variations within a site. The sphericity, surface area, volume and Euler characteristic of pores show the existence of various pyrometamorphic states between the ceramics and within a ceramic. Using alignments of pores and grains, similar pottery shaping techniques are identified for both sites. These results show that the image analysis of archaeological ceramics can provide detailed information about the prehistoric ceramic production technologies with fast data availability.

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Uchikoshi, Tetsuo, Seiichi Furumi, Tohru Suzuki e Yoshio Sakka. "Direct Shaping of Alumina Ceramics by Electrophoretic Deposition Using Conductive Polymer-Coated Ceramic Substrates". Advanced Materials Research 29-30 (novembro de 2007): 227–30. http://dx.doi.org/10.4028/www.scientific.net/amr.29-30.227.

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Cathodic electrophoretic deposition of bimodal alumina suspension was performed using conductive polypyrrole (Ppy) film as an electrode. The coating of the Ppy on nonconductive ceramic substrates was performed by polymerization of pyrrole (Py) in an aqueous solution. The relative green density of the deposits measured by Archimedes’ method was 68 %. Alumina ceramics were obtained by sintering the deposits together with the Ppy coated ceramic substrates in air.

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Filser, F., P. Kocher e L. J. Gauckler. "Net‐shaping of ceramic components by direct ceramic machining". Assembly Automation 23, n.º 4 (dezembro de 2003): 382–90. http://dx.doi.org/10.1108/01445150310501217.

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Deckers, Jan Patrick, Khuram Shahzad, Ludwig Cardon, Marleen Rombouts, Jozef Vleugels e Jean-Pierre Kruth. "Shaping ceramics through indirect selective laser sintering". Rapid Prototyping Journal 22, n.º 3 (18 de abril de 2016): 544–58. http://dx.doi.org/10.1108/rpj-10-2014-0143.

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Purpose The purpose of this paper is to compare different powder metallurgy (PM) processes to produce ceramic parts through additive manufacturing (AM). This creates the potential to rapidly shape ceramic parts with an almost unlimited shape freedom. In this paper, alumina (Al2O3) parts are produced, as Al2O3 is currently the most commonly used ceramic material for technical applications. Design/methodology/approach Variants of the following PM route, with indirect selective laser sintering (indirect SLS) as the AM shaping step, are explored to produce ceramic parts: powder synthesis, indirect SLS, binder removal and furnace sintering and alternative densification steps. Findings Freeform-shaped Al2O3 parts with densities up to approximately 90 per cent are obtained. Research limitations/implications The resulting Al2O3 parts contain inter-agglomerate pores. To produce higher-quality ceramic parts through indirect SLS, these pores should be avoided or eliminated. Originality/value The research is innovative in many ways. First, composite powders are produced using different powder production methods, such as temperature-induced phase separation and dispersion polymerization. Second, four different binder materials are investigated: polyamide (nylon-12), polystyrene, polypropylene and a carnauba wax – low-density polyethylene combination. Further, to produce ceramic parts with increased density, the following densification techniques are investigated as additional steps of the PM process: laser remelting, isostatic pressing and infiltration.

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Risso, L., S. J. Stedman, B. Vicenzi e A. Saggese. "Plastic shaping of ceramic superconducting discs". Materials Chemistry and Physics 36, n.º 1-2 (novembro de 1993): 129–33. http://dx.doi.org/10.1016/0254-0584(93)90019-i.

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Slosarčík, Stanislav, Igor Vehec, Alexander Gmiterko, Pavol Cabúk e Michal Jurčišin. "Technology and Application of 3D Shaped LTCC Modules for Pressure Sensors and Microsystems". Journal of Microelectronics and Electronic Packaging 6, n.º 3 (1 de julho de 2009): 158–63. http://dx.doi.org/10.4071/1551-4897-6.3.158.

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This paper deals with shaping technology of LTCC (low temperature cofired ceramics) and as well on analysis of the possibilities of sensors in 3D shaped modules. Analysis of marginal possibilities of LTCC ceramic shaping was realized on a sample with various bending angles and various layer numbers, where thick-film conductive paths were present. The applicability of the obtained results was demonstrated by the development of a 3D shaped module with a thick-film pressure sensor.

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Pistsova, Irina N. "Contemporary Trends in the Author’s Ceramics by V. V. Portnova". Izvestia Ural Federal University Journal Series 1. Issues in Education, Science and Culture 29, n.º 3 (2023): 76–88. http://dx.doi.org/10.15826/izv1.2023.29.3.049.

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The article is devoted to the development of the Ural artistic ceramics in the late XX — early XXI century, in the history of which a significant role belongs to the representatives of the Krasnoyarsk ceramic school. During this period, changes in socioeconomic conditions led to shift in cultural priorities, which manifested themselves in the polystylistics of postmodernism, that influenced the decorative and applied arts of Russia. The research of the issue is based on the art history and interdisciplinary scientific methods. Using the example of the work of the famous ceramist V. V. Portnova, the author examines the current trends in the shaping of contemporary Russian ceramics that are interest in tectonics and work with the surface. The author analyzes the evolution of the creative style of the ceramist, revealing individual engagement in the artistic and figurative solution of ceramic objects.

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Ruszaj, Adam. "Unconventional processes of ceramic and composite materials shaping". Mechanik 90, n.º 3 (6 de março de 2017): 188–94. http://dx.doi.org/10.17814/mechanik.2017.3.39.

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In order to reach the high quality parts of machines or tools very often ceramic or composite materials on metalic or ceramic base are being applied. Efficient shaping above mentioned materials using cutting or classical grinding is difficult because of their high mechanical properties. Rational solution is application of unconventional machining methods as: electrochemical, electrodischarge or electrochemical – electrodischarge (ECDM) in case when machined materials are at least partly conductive of electrical current. In case of shaping ceramic materials unconductive for electrical current the rational solution can be application of Spark Assisted Chemical Engraving (SACE) process – the special kind of ECDM process.

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Sudiyati, Noor. "Bowl: Anyam Technique on Ceramic". Corak 12, n.º 1 (6 de junho de 2023): 1–12. http://dx.doi.org/10.24821/corak.v12i1.9757.

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Adding value to works of art is the subject of many discussions, and finding a new aesthetic can be accomplished by innovation and experimenting with the medium and techniques employed. This research attempts to make ceramics utilizing various embodied approaches similar to other manufactured materials. Specifically, bowl-shaped ceramics are formed using a woven technique similar to bamboo and then arranged in an interlocking pattern to resemble woven bamboo. The final result of this application technique is in the form of artistic bowls that have afresh aesthetic value for the development of ceramic art. These bowls are hollow due to the woven fabric and contain many values built-in to ceramic form, including material efficiency, organic form, and artistic form, which was previously unexpected. This serves as an accelerator for future application development of various shaping approaches. This confirms that the creative possibilities for plastic clay are virtually endless.

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Sachidhananda, T. G., e V. Adake Chandrashekhar. "Electric Discharge Machining of Conducting Ceramics - A Review". Materials Science Forum 1019 (janeiro de 2021): 121–28. http://dx.doi.org/10.4028/www.scientific.net/msf.1019.121.

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Electrical Discharge machining (EDM) is a nonconventional machining technique, which has been widely used to produce dies and mold. Harder Materials can be machined into complex shapes as long as they conduct electricity. Recent advances in the technologies brought the development of new engineering materials, which are hard to machine with traditional machining processes. Being one of these materials, ceramics possess some unique properties like piezoelectricity and tribological properties which are not found in metal and polymers. EDM is capable of machining these ceramics, given these materials have an adequately high electrical conductivity. Preparing conducting ceramics is pre-requisite for incorporating ceramics in EDM. Different techniques such as compaction, tape casting, extrusion, injection molding and slip casting are used form green ceramic body. These green bodies are subsequently sintered to obtain ceramic parts. Adding conducting elements in the ceramics while processing results in conducting ceramics. These additions increase hardness but fracture toughness of body is compromised. Ceramic parts can also be machined by using assisting electrode and pyrolytic carbon technique. This paper discusses the various methods of shaping conducting ceramics and its machining characteristics for EDM application

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Zych, Łukasz, e Krzysztof Haberko. "Shaping and Sintering of Ceramic Nano-Powders". Key Engineering Materials 264-268 (maio de 2004): 2323–26. http://dx.doi.org/10.4028/www.scientific.net/kem.264-268.2323.

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Rotella, Giovanna, Michela Sanguedolce, Maria Rosaria Saffioti, Luigino Filice e Flaviano Testa. "Strategies for Shaping of Different Ceramic Foams". Procedia Manufacturing 47 (2020): 493–97. http://dx.doi.org/10.1016/j.promfg.2020.04.345.

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Zhang, Wen Xu, Cheng Zu Ren, F. Zheng e Xin Min Jin. "Shaping of Green Ceramic Balls and Precision Lapping of Ceramic Balls for Ceramic Ball Bearings". Key Engineering Materials 259-260 (março de 2004): 471–75. http://dx.doi.org/10.4028/www.scientific.net/kem.259-260.471.

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Lebioda, Marcin, Ryszard Pawlak, Witold Szymański, Witold Kaczorowski e Agata Jeziorna. "Laser Patterning a Graphene Layer on a Ceramic Substrate for Sensor Applications". Sensors 20, n.º 7 (10 de abril de 2020): 2134. http://dx.doi.org/10.3390/s20072134.

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This paper describes a method for patterning the graphene layer and gold electrodes on a ceramic substrate using a Nd:YAG nanosecond fiber laser. The technique enables the processing of both layers and trimming of the sensor parameters. The main aim was to develop a technique for the effective and efficient shaping of both the sensory layer and the metallic electrodes. The laser shaping method is characterized by high speed and very good shape mapping, regardless of the complexity of the processing. Importantly, the technique enables the simultaneous shaping of both the graphene layer and Au electrodes in a direct process that does not require a complex and expensive masking process, and without damaging the ceramic substrate. Our results confirmed the effectiveness of the developed laser technology for shaping a graphene layer and Au electrodes. The ceramic substrate can be used in the construction of various types of sensors operating in a wide temperature range, especially the cryogenic range.

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Tang, Yuxin, Zhenhai Xue, Guohong Zhou e Song Hu. "Fabrication of High Thermal Conductivity Aluminum Nitride Ceramics via Digital Light Processing 3D Printing". Materials 17, n.º 9 (25 de abril de 2024): 2010. http://dx.doi.org/10.3390/ma17092010.

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The sintering of high-performance ceramics with complex shapes at low temperatures has a significant impact on the future application of ceramics. A joint process of digital light processing (DLP) 3D printing technology and a nitrogen-gas pressure-assisted sintering method were proposed to fabricate AlN ceramics in the present work. Printing parameters, including exposure energy and time, were optimized for the shaping of green bodies. The effects of sintering temperature, as well as nitrogen pressure, on the microstructure, density, and thermal conductivity of AlN ceramics were systematically discussed. A high thermal conductivity of 168 W·m−1·K−1 was achieved by sintering and holding at a significantly reduced temperature of 1720 °C with the assistance of a 0.6 MPa nitrogen-gas pressure. Further, a large-sized AlN ceramic plate and a heat sink with an internal mini-channel structure were designed and successfully fabricated by using the optimized printing and sintering parameters proposed in this study. The heat transfer performance of the ceramic heat sink was evaluated by infrared thermal imaging, showing excellent cooling abilities, which provides new opportunities for the development of ceramic heat dissipation modules with complex geometries and superior thermal management properties.

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Lyu, Bing Hai, Chen Chen Dong, Fen Fen Zhou, Qian Fa Deng, Ju Long Yuan e Ping Zhao. "Precision Shaping Experiment of Ceramic Ball Blank with Oscillating-Plate Lapping Method". Advanced Materials Research 1017 (setembro de 2014): 526–31. http://dx.doi.org/10.4028/www.scientific.net/amr.1017.526.

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An oscillating-plane lapping method, by which pre-sintered ceramic ball blanks are shaped before full sintering, was proposed to improve the precision of the ceramic ball blanks. For good sphercity and diameter consistency of ceramic ball blanks obtained after this shaping process, much less workmaterial is needed to be removed in the following lapping process of the full sintered ceramic ball blanks. Shaping experiments were carried out on a newly developed oscillating-plane lapping device. Results show that material removal rate of the pre-sintered Si3N4 ball blanks with nominal diameter Ø13mm reaches 0.92mm/h in average. The sphericity error is reduced from 0.07-0.196mm to 0.002-0.006mm, and the consistency error of diameter is reduced from 0.309 to 0.019mm after 45min's shaping. Compared with the processing time of the unshaped full-sintered blanks in the following lapping process, it takes just a half time for the shaped full-sintered blanks to be semi-finished in this study. It indicates that the oscillating-plane lapping is a promising high efficient method to improve the precision and consistency of the ceramic ball blanks, and the efficiency of the followed lapping process can be improved notably.

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Falkowski, P., e P. Elert. "Application of Water-Thinnable Photopolymerizable Resin for Shaping of Microreactors - Preliminary Results". Archives of Metallurgy and Materials 56, n.º 4 (1 de dezembro de 2011): 1177–83. http://dx.doi.org/10.2478/v10172-011-0132-7.

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Application of Water-Thinnable Photopolymerizable Resin for Shaping of Microreactors - Preliminary ResultsThe article presents the preliminary research on application of synthesized water-thinnable polyester resin for shaping of ceramic element by photopolymerization. The ceramic pastes made of alumina (30 vol%) and photocurable resins were used to prepare thin layers (tapes) and then were exposed to UV radiations. The cure depth and König hardness of cured layers were determined as well as the effect of a photoinitiator concentration on polymerization. The density of sintered ceramic samples also were examined. The research showed that the developed pastes with water-thinnable resin might be used to mold the ceramic elements by soft lithography method. The results obtained for polyester resin were compared with results obtained for commercially available photocurable resin.

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Ryniewicz, Andrzej, Anna M. Ryniewicz, Łukasz Bojko, Paweł Pałka e Wojciech Ryniewicz. "THE ASSESSMENT OF THE LAYERED STRUCTURE OF PROSTHETIC CROWNS IN MICROSCOPIC EXAMINATIONS". Tribologia 292, n.º 4 (30 de novembro de 2020): 59–70. http://dx.doi.org/10.5604/01.3001.0014.5908.

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Prosthetic crowns are made in accordance with the principles of clinical procedures while taking into account the rules of endurance, biocompatibility, and aesthetics. Depending on the biomaterial and manufacturing technology, crown frameworks are veneered with an appropriate set of ceramics with selected thermal expansion. The veneering layers responsible for tribological cooperation in occlusal contact should properly adhere to the framework. The aim of the research is to conduct the microscopic and EDS chemical analysis to evaluate the process of shaping veneering layers on frameworks produced using new digital technologies, i.e. the technology of milling and laser sintering. The research material consists of specimens produced in perpendicular cross-sections through the layered structures of metal-ceramic, ceramic-veneered glassceramic, and zirconium crowns. The microscopic examinations were carried out using the specimens and included the elemental EDS analysis performed on the surfaces and in certain points. The structures of metal and ceramic frameworks, ceramic veneering layers, and adhesive zones were determined.

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Ren, C. Z., Z. Y. Wu, X. M. Jin, C. J. Wang e Q. Xu. "A new shaping model for green ceramic balls". Journal of Materials Processing Technology 129, n.º 1-3 (outubro de 2002): 423–26. http://dx.doi.org/10.1016/s0924-0136(02)00592-7.

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Luyten, J., J. Cooymans, C. Smolders, S. Vercauteren, E. F. Vansant e R. Leysen. "Shaping of multilayer ceramic membranes by dip coating". Journal of the European Ceramic Society 17, n.º 2-3 (janeiro de 1997): 273–79. http://dx.doi.org/10.1016/s0955-2219(96)00129-x.

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Zurowski, Radoslaw, Malgorzata Gluszek, Agnieszka Antosik, Emilia Pietrzak, Gabriel Rokicki e Mikolaj Szafran. "Copolymers dispersions designed to shaping of ceramic materials". Journal of Thermal Analysis and Calorimetry 132, n.º 1 (13 de janeiro de 2018): 453–61. http://dx.doi.org/10.1007/s10973-017-6955-3.

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Lyu, B. H., Q. Shao, Q. F. Deng, C. Ye, J. L. Yuan e X. Lyu. "Oscillating-plate shaping method for ceramic ball blanks". International Journal of Advanced Manufacturing Technology 96, n.º 9-12 (12 de março de 2018): 3737–45. http://dx.doi.org/10.1007/s00170-018-1748-9.

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Gal'perina, M. K., V. K. Kanaev e N. V. Kolyshkina. "Shaping technology for ceramic sheets using vacuum filtration". Glass and Ceramics 49, n.º 1 (janeiro de 1992): 36–39. http://dx.doi.org/10.1007/bf00676673.

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Xu, Bin, e Junpeng Shao. "Dry Sizing and Shaping Technique for Ceramic Tiles". Transactions of the Indian Ceramic Society 71, n.º 3 (setembro de 2012): 159–62. http://dx.doi.org/10.1080/0371750x.2012.738487.

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Grigoriev, Sergey N., Marina A. Volosova, Sergey V. Fedorov, Anna A. Okunkova, Petr M. Pivkin, Pavel Y. Peretyagin e Artem Ershov. "Development of DLC-Coated Solid SiAlON/TiN Ceramic End Mills for Nickel Alloy Machining: Problems and Prospects". Coatings 11, n.º 5 (29 de abril de 2021): 532. http://dx.doi.org/10.3390/coatings11050532.

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The study is devoted to the development and testing of technological principles for the manufacture of solid end mills from ceramics based on a powder composition of α-SiAlON, β-SiAlON, and TiN additives, including spark plasma sintering powder composition, diamond sharpening of sintered ceramic blanks for shaping the cutting part of mills and deposition of anti-friction Si-containing diamond-like carbon (DLC) coatings in the final stage. A rational relationship between the components of the powder composition at spark plasma sintering was established. The influence of optimum temperature, which is the most critical sintering parameter, on ceramic samples’ basic physical and mechanical properties was investigated. DLC coatings’ role in changing the surface properties of ceramics based on SiAlON, such as microrelief, friction coefficient, et cetera, was studied. A comparative analysis of the efficiency of two tool options, such as developed samples of experimental mills made of SiAlON/TiN and commercial samples ceramic mills based on SiAlON, doped with stabilizing additives containing Yb when processing nickel alloys (NiCr20TiAl alloy was used as an example). DLC coatings’ contribution to the quantitative indicators of the durability of ceramic mills and the surface quality of machined products made of nickel alloy is shown.

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Santos, A. A., I. C. Cosentino e Luis Antonio Genova. "Evaluation of Compaction Behaviour of Spray-Dried Alumina by Hg Porosimetry and SEM". Materials Science Forum 727-728 (agosto de 2012): 740–45. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.740.

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The powder compaction process is the most widely used forming technique for shaping ceramic products, since traditional ceramic as floors until advanced ceramics for technical applications. This process is characterized by high productivity but it has a serious problem, namely the density gradient originated during the die cavity filling and the subsequent compaction operation[. Therefore, the process requires a high control of all parameters involved in order to guarantee to obtain samples with high homogeneity of the green density, which ensures a sintered body of high quality and low population of microstructural defects. Thus, it is extremely important to understand the variable that controls the compaction mechanisms and interfere in the homogeneity of the green density along the compacted body.

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Kloska, Manja, Heike Bartsch, Jens Müller, Thomas Haas e Christian Zeilmann. "Functionalized Three-Dimensional Multilayer Ceramic Modules". Electronics 10, n.º 3 (22 de janeiro de 2021): 248. http://dx.doi.org/10.3390/electronics10030248.

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Three-dimensional interconnect devices are still strongly related to plastic materials. Since the use of these materials is limited in harsh environments, there is an application gap, which could be filled by ceramic circuit carriers. Low-temperature cofired ceramics (LTCC) offer promising solutions to fill this gap. This work provides a feasibility study, including the whole technological chain of ceramic multilayer processing. Targeting a curved multilayer substrate, fully equipped with SMD (Surface-mounted device) components, the particularities of single process steps are investigated. Two shaping methods based on quartz glass molds are compared with regard to shape fidelity and technological effort. The investigation of internal conductor lines and via connections reveals that the metallization should have a minimum width of 200 µm and the via diameter is limited to 150 µm. Further considerations focus on the possible footprint of components and use of cavities to increase the footprint of components. The limits of wire bonding on curved surfaces were inspected. Finally, the work presents a demonstrator of a fully equipped four-layer ceramic circuit, including internal wiring. Hence, the transfer of the 2.5-dimensional multilayer ceramic technology into the third dimension is proven.

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Hu, Fuwen, Tadeusz Mikolajczyk, Danil Yurievich Pimenov e Munish Kumar Gupta. "Extrusion-Based 3D Printing of Ceramic Pastes: Mathematical Modeling and In Situ Shaping Retention Approach". Materials 14, n.º 5 (28 de fevereiro de 2021): 1137. http://dx.doi.org/10.3390/ma14051137.

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Extrusion-based three-dimensional (3D) printing methods are preferred and emerging approaches for freely digital fabrication of ceramics due to ease of use, low investment, high utilization of materials, and good adaptability to multi-materials. However, systematic knowledge still lacks an explanation for what is their 3D printability. Moreover, some uncontrollable factors including extrudate shape retention and nonuniform drying inevitably limit their industrial applications. The purpose of this research was to present a new shaping retention method based on mathematical synthesis modeling for extrusion-based 3D-printing of ceramic pastes. Firstly, the steady-state equilibrium equation of the extrusion process was derived to provide clearer theoretical indications than purely experimental methods. Furthermore, a mathematical description framework was synthesized to better understand the extrusion-based 3D-printing of ceramic pastes from several realms: pastes rheology, extrudability, shape-holdability, and drying kinetics. Secondly, for eliminating shaping drawbacks (e.g., deformation and cracks) originating from non-digital control factors, we put forward a digital shape-retention technology inspired by the generalized drying kinetics of porous materials, which was different from existing retention solutions, e.g., freezing retention, thermally induced gelation, and using removable support structures. In addition, we developed an in situ hot air flow drying device easily attached to the nozzle of existing 3D printers. Confirmatory 3D-printing experiments of thin-walled cone-shape benchmark parts and the fire arrowhead-like object clearly demonstrated that the presented shape-retention method not only upgraded layer-by-layer forming capability but also enabled digital control of extrudate solidification. In addition, many more experimental results statistically showed that both fully solid parts and purely thin-wall parts had higher dimensional accuracy and better surface quality than the offline drying method. The 3D printed ceramic products with complex profiled surfaces conceivably demonstrated that our improved extrusion-based 3D-printing process of ceramic pastes has game-changing potentials beyond the traditional craftsmanship capacity.

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Ziesche, Steffen, e Uwe Partsch A. Michaelis. "Ceramic Interface and Multilayer Technology for Micro Fuel Cells". Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2011, CICMT (1 de setembro de 2011): 000029–32. http://dx.doi.org/10.4071/cicmt-2011-ta13.

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Planar fuel cells typically consist of several functional layers stacked on top of each other. We have extended the concepts of multilayer ceramics and thick film technology to provide novel approaches for the design of extremely compact and cost efficient micro fuel cells, either for the high temperature operation (SOFC) or for near ambient operation (PEMFC). Solid oxide fuel cells (SOFCs) operate at temperatures as high as 850°C. Several ceramic technologies were developed to facilitate mechanical integrity and good electrical contact to the cell at these high operating temperatures and upon rapid thermal cycling. Ceramic interconnector plates can be manufactured by adapting the multilayer / thick film / via approach known from LTCC to HTCC multilayers such as zirconia. The result is a 3D shaped SOFC interconnector plate with an unparalleled thermomechancial stability and rigidity for special applications like military. Extending that HTCC functionalisation approach further led us to the manufacturing of other multilayer ceramic based micro-reactors, namely micro-reformers for hydrogen production on a pocket size scale. We have combined several high throughput 3D shaping technologies with novel catalyst coating approaches to yield micro-reactors that are cost efficient to manufacture and that expose a high inner catalytically active surface at a low pressure drop. We have also applied thick film technologies to incorporate additional functions such as sensors or heaters right into the multilayer. The contribution is concluded with a summary of the crucial shaping and coating technologies and an outlook on how these can be applied to future compact SOFC and PEMFC fuel cells.

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Estournès, Claude, Djar Oquab, Serge Selezneff, Mathieu Boidot, Daniel Monceau, D. Grossin, Christophe Drouet et al. "Shaping of Nanostructured Materials or Coatings through Spark Plasma Sintering". Materials Science Forum 706-709 (janeiro de 2012): 24–30. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.24.

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In the field of advanced ceramics, Spark Plasma Sintering (SPS) is known to be very efficient for superfast and full densification of ceramic nanopowders. This property is attributed to the simultaneous application of high density dc pulsed current and load, even though the sintering mechanisms involved remain unclear. In the first part of the paper, the mechanisms involved during SPS of two insulating oxide nanopowders (Al2O3 and Y2O3) are discussed while in the second part illustrations of the potential of SPS will be given for (i) Consolidation of mesoporous or unstable nanomaterials like SBA-15 or biomimetic apatite, respectively; (ii) Densification of core (BT or BST)/shell (SiO2 or Al2O3) nanoparticles with limited or controlled reaction at the interface. (iii) In-situ preparation of surface-tailored Fe–FeAl2O4–Al2O3 nanocomposites, and finally (iv) One-step preparation of multilayer materials like a complete thermal barrier system on single crystal Ni-based superalloy.

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Moritz, Tassilo, e Hans Jürgen Richter. "Freeze Casting of Ceramic Components Using Ice Cores and Ice Moulds". Advances in Science and Technology 45 (outubro de 2006): 391–96. http://dx.doi.org/10.4028/www.scientific.net/ast.45.391.

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A novel shaping technique for advanced ceramic components is presented which allows manufacturing of complex ceramic components with enclosed cavities by using ice moulds or ice cores. Different suspensions of alumina and zirconia powders have been developed for this special freeze casting technique. The suspensions must meet following requirements: high solid content, the capability of flow, a freezing point between -10 and -2 °C, and a casting temperature below 0 °C. After the casting process the moulds and cores could be easily removed by sublimation. The suspension liquid was removed in the frozen state simultaneously. In this way very complicated hollow or filled structures such as metallic or ceramic components encapsulated in ceramic shells could be produced. No de-moulding was necessary, no solid core must be removed, and no liquid phase appeared as known from other lost-mould techniques. Ice mould casting is a very environmental-friendly shaping technique. Furthermore, the influence of dispersing agents, anti-freeze agents and of the freezing speed on the pore structure of the ceramic components has been investigated.

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Dong, Yue, Xiao Dong Li, Shao Hong Liu, Ji Guang Li e Xu Dong Sun. "Novel Direct Coagulation Casting of Alumina Suspensions Using Y³⁺-Ion Releasing Substances as Coagulant". Key Engineering Materials 602-603 (março de 2014): 164–69. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.164.

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Direct coagulation casting (DCC) is a relatively new ceramic near-net-shape forming process which can form homogeneous ceramic green body with complex shape and high density. Direct coagulation casting of aqueous alumina slurries by adding Y3+ions, which have been frequently used as additive for the sintering of alumina ceramics, were studied. Two different kinds of Y3+-ion releasing substances, Y2O3powder and Y(NO3)3, were used as coagulants and were introduced into stabilized alumina suspensions directly after dispersing. Compared with that of Y2O3powder, both the coagulation time and the added amount required for a reasonable shaping were significantly reduced for using Y(NO3)3as coagulant. The effects of the two coagulants on the properties of the consolidated green bodies and sintered ceramics were studied. The mechanisms of coagulation induced by the addition of Y3+-ions were discussed on the basis of interactions between Y3+ions and the added polyelectrolyte dispersant.

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35

Li, Ya-yun, Long-tu Li e Bo Li. "Direct ink writing of special-shaped structures based on TiO2 inks". Modern Physics Letters B 30, n.º 11 (29 de abril de 2016): 1650212. http://dx.doi.org/10.1142/s0217984916502122.

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Direct ink writing (DIW) method is a novel kind of ceramic fabrication approach which allows one to design and rapidly construct ceramic products in complex shapes without the need for any lithographic masks, dies or expensive moulds. A 40 wt.% water-based titanium dioxide (TiO2) suspension was formulated. With the help of DIW technique, two-dimensional (2D) spiral structures, three-dimensional (3D) woodpile structures, cylindrical structures and half conical structures at micrometer scale were fabricated. According to the rheological test, the ink shows a shear-thinning behavior and appropriate viscoelastic properties, which ensures a feasible shaping process. The scanning electron microscopy (SEM) test shows that the samples sintered at 1050[Formula: see text]C for 2 h have formed ceramics completely. The DIW method has merits to pattern ceramics into special-shaped structures into two and three dimensions with high precision and good designability, which provides new ideas and methods for structural, functional and biomedical applications.

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Sanchez-Herencia, Antonio Javier. "Water Based Colloidal Processing of Ceramic Laminates". Key Engineering Materials 333 (março de 2007): 39–48. http://dx.doi.org/10.4028/www.scientific.net/kem.333.39.

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Multilayered materials and coating are complex structures proposed among others to face the structural requirements of ceramics. The development of reinforcement mechanism by laminated structures can be due to deflection criteria or to the presence of residual stresses and requires of tailored laminates. These designs are characterized by the phases, thickness and distribution of the layers as well as the joining strength between them. In this sense water based colloidal processing techniques are used to fabricate layered structures by consolidating the layers from fluid dispersions of the powders in water. In these processing methods the phases presented in the final laminate are mainly given by the composition of the starting slurries while the changes in thickness and sharpness of the layers are controlled by acting on the processing parameters. The achievement of stable slurries is a shared step for all the colloidal processing techniques. In the water based slurries the stability will be dominated by the polar media, the surface behavior of the particles and the presence of dispersant additives to increase the repulsion between particles. The stable slurry ensures an effective milling and dispersion of the phases as well as high solid loadings, if required. Further processes associated to shaping and consolidation of the layers requires the incorporation of additives and-or water removal. The shaping methods based on aqueous slurries can be classified taking into account the process of solid-water separation. For each of those shaping methods, the nature and amount of the additives is different in order to get the optimum rheological behavior and green strength after drying. Depending on the thickness of layers and coatings as well as the shape and dimensions of the samples, the shaping method can be selected alone and combined with others.

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Todd, J. A., e S. M. Copley. "Development of a Prototype Laser Processing System for Shaping Advanced Ceramic Materials". Journal of Manufacturing Science and Engineering 119, n.º 1 (1 de fevereiro de 1997): 55–67. http://dx.doi.org/10.1115/1.2836556.

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Laser machining has been shown to offer an increasingly attractive alternative to net shape forming processes and/or diamond grinding for producing components of advanced ceramic and ceramic composite materials. The control of machine parameters (incident power, feed, beam polarization, position of the focal plane and orientation of the beam relative to the surface) necessary for the optimization of process parameters (material removal rate and arithmetic average surface roughness) and of mechanical properties will be discussed. It will then be shown how these parameters can be incorporated into the operation of a prototype, fully automated, five axis, closed loop controlled laser shaping system (comprising a beam conditioner, high power laser scanner and noncontacting position sensor) to accurately and cost effectively produce complex shapes in advanced ceramic materials.

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38

Usuki, Eiji, Nobuyoshi Asai, Kiichi Oda e Suguru Suzuki. "Development of Ceramic Shaping Device with Electrophoretic Deposition Method." Journal of the Society of Powder Technology, Japan 38, n.º 9 (2001): 633–36. http://dx.doi.org/10.4164/sptj.38.633.

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Wahyu, Rizky, e Iswantoi Iswantoi. "Analysis of variation of iron coating rubber for upper punch moulds". Procedia of Engineering and Life Science 7 (23 de fevereiro de 2024): 138–43. http://dx.doi.org/10.21070/pels.v7i0.1567.

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This study investigates the evolution of ceramic mold design and manufacturing processes, focusing on the role of punches in shaping ceramics through injection molding techniques. Key findings reveal diverse punch types—isostatic, pressure rubber, and exhaust punches—tailored to meet varying market demands. By employing ASTM 1045 high-performance 45 steel, we explore the impact of these punches on product quality and efficiency. Qualitative research methods, comprising literature review, observations, and interviews, were utilized to analyze the production process, formulation of ceramic bodies, and variations within ceramic molding tools and procedures. Our work contributes valuable insights into the advancements of injection molding technology, particularly in the context of rapid growth in polymeric materials' usage and their potential for mass production via fast cycle times and high quantities. Highlight : Diverse punch types tailored to meet market demands, including isostatic, pressure rubber, and exhaust punches Utilization of ASTM 1045 high-performance 45 steel for improved product quality and efficiency Employment of qualitative research methods, such as literature reviews, observations, and interviews, to examine the production process, ceramic body formation, and tool variations Keywords: ceramic mold, punches, injection molding, ASTM 1045 steel, diversified punches, qualitative analysis

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Kosmač, Tomaž, Aleš Dakskobler, Mihael Kermc e Zmago Stadler. "Ceramic Piston for Hydraulic Brakes: Design Study". Advances in Science and Technology 45 (outubro de 2006): 1771–75. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1771.

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A design study for ceramic pistons was undertaken in order to address the overheating problems associated with the caliper during aggressive braking using modern C/C-SiC brake discs. The reasoning behind the piston design and the choice of the shaping technology are explained. Zirconia-toughened mullite (ZTM) ceramic was chosen for the pistons, because this material exhibits a low thermal conductivity, sufficiently high mechanical strength and fracture toughness, as well as very good thermal-shock resistance. The manufacturing technology of experimental ceramic brake pistons involved compounding of the selected starting powders to form a high-solids-loadingcontaining feedstock, tooling, shaping of green parts by low-pressure injection molding, extraction of the organic binder, pressure-less sintering in air and final machining. Prototypes brake pistons were fabricated and successfully tested as components of motorcycle brake systems in a test laboratory and on a motorcycle racing track.

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ÇİL, Hayati. "PETER VOULKOS CERAMICS: ESCAPE INTO FORM AS THERE IS NO ESCAPE FROM MATERIAL". SOCIAL SCIENCE DEVELOPMENT JOURNAL 7, n.º 31 (15 de maio de 2022): 14–21. http://dx.doi.org/10.31567/ssd.618.

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It is thought that the art and design of ceramics led the art and craft production of humanity in the civilization process. Ceramics, which has such a rich history, has a permanent meaning that has taken its place in the audience's visual reading. This situation arises from the nature of the goods to which ceramics has owed its existence since primitive times. Historically, the imaginary and object characteristics of ceramics and the meaning associated with it follow a process that is shaped by primitive needs, turning into functional materials that help life, and in this respect, into goods. In this sense, ceramics created an intercultural code in the minds of the audience regarding the characteristics of the goods with which ceramics is associated. In this context, the return of the material and traditional object production in the art of ceramics also gains a functional form semiotic expression. Especially in the face of the changing artistic expression and the traditional understanding of art, which was falling apart after 1960, it is seen that the art of ceramics passed over this atmosphere with the discipline's own inner conflict regarding functionality. Ceramic artists or artists who prefer ceramics as a material and use ceramic technology in the production of art objects have made it possible to get rid of the traditional codes of ceramics and to reveal their subjective art creations by being loyal to the material that forms the character of the discipline only through the practices they carry out regarding form. In this sense, Peter Voulkos, whose art practice is discussed, has an abstract expressionist attitude that eliminates functions such as cutting, adding, drilling and assemblage, which he applies in his intervention to ceramic form, apart from the predetermined and taken-for-granted situation such as function and usability, by breaking it off from its functional context and with an intuitive understanding of shaping examined. Keywords: Ceramic Art, Peter Voulkos, Contemporary art

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Li, Nan, Lei Gao, Zhong Zhou Yi, Feng Rui Zhai e Ke Shan. "Temperature Field Simulation of TC4/SiC Bilayer in Laser Forming". Solid State Phenomena 281 (agosto de 2018): 946–51. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.946.

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Laser forming, an advanced technology widely used for the shaping and adjustment of metallic and non-metallic materials, can also be used to process metal/ceramic materials. Laser forming technique is based on the temperature gradient mechanism (TGM) and temperature distribution is the main factor that affects the laser forming process. In this study, the finite element method (FEM) has been applied to predict the temperature field of TC4/SiC metal/ceramic bilayer during the laser forming process. Temperature of different points in the upper surface of the metal material, interface with the two layers and the lower surface of the ceramic material has been calculated. Parameters like laser input power and laser scan-speed have been investigated. This study is aimed at providing data for the precise control of laser forming in the process of shaping and adjusting TC4/SiC bilayers.

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Knitter, R., W. Bauer e D. Göhring. "Microfabrication of ceramics by rapid prototyping process chains". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 217, n.º 1 (1 de janeiro de 2003): 41–51. http://dx.doi.org/10.1243/095440603762554604.

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Most shaping processes for ceramics are based on a powder technological moulding process using a negative mould and subsequent thermal compaction. Especially for prototypes and small-lot series of microcomponents, the outlay for moulds is the major costing factor. Therefore the use of rapid prototyping (RP) processes can decisively reduce the costs and time in product development of ceramic microcomponents. By combining the high resolution of, for example, stereolithography as an inexpensive and fast supply for master models with the high flexibility of low-pressure injection moulding, a rapid prototyping process chain (RPPC) has been established for the fabrication of micropatterned ceramic components as functional models or pre-production lots. This RPPC proved to have a very high moulding precision and accuracy in the submillimetre range, but also enables the fabrication of components with outer dimensions of several centimetres. Different RP techniques were investigated with regard to their suitability to be used as master models in the replication chain. The quality of the master models turned out to be of decisive significance for the quality and reproducibility of the ceramic mouldings.

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Chen, Ling, Xian Liang Song, Jian Dong Ye e Bing Li. "Colloidal In-Situ Consolidation Forming of Al₂O₃ Ceramics Using Modified Starch". Key Engineering Materials 280-283 (fevereiro de 2007): 1027–32. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1027.

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The forming of Al2O3 ceramics was carried out by the colloidal in-situ consolidation using modified starch in this work. The effects of the modified starch content in the alumina suspensions on their rheological behavior, consolidation, microstructure and properties of the green bodies were investigated. The different shape and high relative density of ceramic green bodies were achieved by this method. The results indicated that the alumina suspensions with modified starch were easier to cast due to their low viscosity and high fluidity. After drying, the linear shrinkage of the green bodies was low, ranging between about 1.5% and 2.2% and their bulk density was higher than 57% of the theoretical density. The maximum bending strength of the dried green bodies reached to 8.2 MPa and the microstructure of the green bodies was uniform with a narrow unimodal distribution of pore size. It is concluded that the colloidal in-situ consolidation casting using modified starch can perform near-net shaping of ceramic components with high-performance and it is a potential forming technique for ceramics.

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Setz, Luiz Fernando Grespan, Laís Koshimizu, Sonia Regina Homem de Mello-Castanho e Márcio Raymundo Morelli. "Rheological Analysis of Ceramics Suspensions with High Solids Loading". Materials Science Forum 727-728 (agosto de 2012): 646–51. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.646.

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The pure oxides (yttria, zirconia, titania, alumina, etc.) pastes ceramics production by concentrate suspensions is interesting because differently than plastic ceramics (clays), where these behaviours are often empirical available, the rheological suspensions behaviour are extensively studied. Thus, controlling the concentrate slips rheological parameters, is possible extend these analysis for better understand and control the plastic pastes production, providing subsidies to obtain after shaping process, such as extrusion and calendering, suitable products for the desired application. Thus, alumina suspensions rheological behaviour, with high solids loading (> 50 vol.%) adequately stabilized, slip cast shaped are available in this work. High solids loading suspensions, up to 60 vol.%, presents adequate flow for thickeners/plasticizers elements adds to produce ceramic plastic pastes.

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Yoo, Ju Hyun, e Wei Gao. "Near-Net Ceramic Micro-Tubes Fabricated by Electrophoretic Deposition Process". International Journal of Modern Physics B 17, n.º 08n09 (10 de abril de 2003): 1147–51. http://dx.doi.org/10.1142/s021797920301865x.

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The forming or shaping of ceramic micro-tubes is usually difficult with conventional ceramic processing. In some cases, parts that are not possible to produce by any other techniques can be fabricated with electrophoretic deposition process (EPD). In this paper, EPD is shown to be an operationally simple, rapid, and reliable technique for forming a wide range of ceramic micro-tubes required in electronic devices such as actuators, motors, optical modulators and MEMS. These topics will be discussed in detail.

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Torres, C. I., N. M. Rendtorff, M. Cipollone, E. F. Aglietti e G. Suárez. "Comparative evaluation of properties of a clay based ceramic shaped via four techniques". Cerâmica 64, n.º 370 (junho de 2018): 176–82. http://dx.doi.org/10.1590/0366-69132018643702270.

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Abstract The results of qualitative and quantitative properties of clay based ceramic are presented in this work. Four different shaping methods and sintering temperatures were used to understand their influence in the final properties of a ceramic material formulated using kaolinite clay and calcined alumina. This material can be used as a structural ceramic for different applications, and there is no pre-established relation between the forming method and the final sintered properties. Forming methods used to prepare the samples were uniaxial pressing (a batch process that allows application in dry samples), extruding (a continuous process that requires moisture), slip casting (a process that allows to shape complex ceramic ware), and lamination (a batch process that requires moisture). Sintering temperatures were in the range of 1100 and 1400 °C. In order to compare how properties behave as the shaping method and sintering temperature change, textural properties, shrinkage, porosimetry, phase composition and mechanical strength were evaluated and analyzed. Scanning electron microscopy and microtomography were employed for analyzing and comparing the developed microstructures. Differences in the resulting properties are explained in terms of the developed crystalline phases and microstructure.

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Clasen, Rolf, e Christian Oetzel. "Near Net Shaping with Bimodal Powders on Shaped Membranes via EPD". Key Engineering Materials 412 (junho de 2009): 45–50. http://dx.doi.org/10.4028/www.scientific.net/kem.412.45.

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The electrophoretic deposition (EPD) is a very promising process for shaping compacts, especially for nanopowders. Up till now EPD is not used on a large-scale production of ceramic products. Additionally, the higher cost of nanopowders was also a barrier for the development of new products. As the deposition rate at EPD is independent of particle size, it is an ideal process for shaping compacts of powder mixtures with nanopowders. Silica and zirconia powders were used as model systems to demonstrate the advantages of EPD. Applications might be the preparation of high-purity silica glass for processing of semiconductors and zirconia ceramics for near net-shaped dental crowns. In both cases the optimum green density was achieved for approx. 10 % addition of nanopowders to a coarser matrix powder. The compacts were homogenous. Alternatively, compacts of different powders can be prepared in a two-step process. Examples are shown for the electrophoretic impregnation (EPI) and a reactive forming of nanoparticles inside the pore volume of a compact consisting of coarser particles.

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Niu, Fangyong, Dongjiang Wu, Guangyi Ma e Bi Zhang. "Additive manufacturing of ceramic structures by laser engineered net shaping". Chinese Journal of Mechanical Engineering 28, n.º 6 (4 de agosto de 2015): 1117–22. http://dx.doi.org/10.3901/cjme.2015.0608.078.

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Tsai, C. H., e H. W. Chen. "The laser shaping of ceramic by a fracture machining technique". International Journal of Advanced Manufacturing Technology 23, n.º 5-6 (1 de março de 2004): 342–49. http://dx.doi.org/10.1007/s00170-003-1679-x.

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