Evolution of the microstructure and mechanical properties of stereolithography formed alumina cores sintered in vacuum
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Stereolithography
Shrinkage
Alumina ceramic
The necessity and importance of lowering the sintering temperature of high alumina ceramics were discussedfrom the perspectives of energy strategy as well as the existenceand development of high alumina ceramics industry. According to its inherent laws and the features of alumina ceramics sintering, lower sintering temperature will improve its quality. In this article , some feasible technical programs were put forward to lower the sintering temperature.
Alumina ceramic
High energy
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Stereolithography
Shrinkage
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This paper introduces the characteristic of microwave sintering,introduces and analyses the process of microwave sintering of the alumina ceramic,moreover,compares with the experiments of conventional sintering method.Based on the research,some results are obtained ,and provide experimental basis for microwave sintering of ceramics.
Alumina ceramic
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Alumina ceramics is densely sintered at 1450℃ by using CaO-MgO-SiO2 glass(CMS-G) and TiO2 as sintering assistant.The effect that the weight content of CMS-G and TiO2 to sintering character,and fine texture and sintering kinetics of alumina ceramics is studied.The results show that CMS-G and TiO2 can accelerate density of alumina ceramics effectively,the relative density of alumina ceramics is up to 98.25%,when content of CMS-G is 3% and TiO2 is 1%.Sintering process is controlled by diffusion,and activation energy of liquid phase sintering is 113.4kJ/mol.
Alumina ceramic
Liquid phase
Relative density
Texture (cosmology)
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In the industrial use of stereolithography, precision is always a problem. The basic phenomenon of solidification shrinkage has not been sufficiently investigated. This study aims at clarifying the initial linear shrinkage of cured resin in a minute volume. Experimental equipment has been developed which measures the time history of the single strand in situ in a stereolithography machine. An analysis model of the time history of a minute volume linear shrinkage was shown using the measured shrinkage of a cured line segment. The relation between the time history of the linear shrinkage and temperature was measured and the shrinkage in the minute volume after irradiation was found to result due to temperature variation. Deformation and linear shrinkage were measured with two scanning orders to control the thermal distribution in layer forming. The effects of thermal distribution were also observed in one layer forming.
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Stereolithography
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The selection of suitable ceramic powders for the preparation of UV-curable ceramic suspensions, which are well suited for printing processes and production of high-performance ceramic components, is a crucial factor in the practical industrial and engineering application of digital light processing (DLP) ceramic stereolithography. Therefore, this study aims to provide a comprehensive evaluation of alumina ceramic parts fabricated via DLP stereolithography using a variety of alumina powders with varying sizes and morphologies. Experiments were conducted to examine the rheological response, recoating performance, and curing behavior of the UV-curable alumina suspensions. Additionally, the thermal decomposition behavior of the 3D-printed green-bodies, as well as the shrinkage, surface roughness, relative density, sintering behavior, microstructure, and mechanical properties of the 3D-printed sintered alumina components were thoroughly investigated. The best physical and mechanical performances were achieved by printing 55 vol% suspensions prepared using near-spherical AA04 alumina powders (median diameter 0.4 μm). The AA04 sintered alumina ceramics showed a relative density, Flexural strength, Vickers hardness, and roughness in top, bottom, and side surface of 99.02 %, 394.52 MPa, 18.12 Gpa, and 114, 134, and 128 nm, respectively. This study elucidates the effects of ceramic particle size and morphology on the entire technological process of DLP-based ceramic stereolithography, thereby establishing the guidelines for the fabrication of high-performance 3D-printed ceramic objects in industrial and engineering production by selecting appropriate ceramic powders.
Stereolithography
Alumina ceramic
Digital Light Processing
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Being the earliest form of additive manufacturing, stereolithography (SLA) fabricates 3D objects by selectively solidifying the liquid resin through a photopolymerization reaction. The ability to fabricate objects with high accuracy as well as a wide variety of materials brings much attention to stereolithography. Since its invention in the 1980s, SLA underwent four generations of major technological innovation over the past 40 years. These innovations have thus resulted in a diversified range of stereolithography systems with dramatically improved resolution, throughput, and materials selection for creating complex 3D objects and devices. In this paper, we review the four generations of stereolithography processes, which are scanning, projection, continuous and volumetric stereolithography. For each generation, representative stereolithography system configurations are also discussed in detail. In addition, other derivative technologies, such as scanning–projection, multi-material, and magnetically assisted stereolithography processes, are also included in this review.
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The effects are investigated of nano-Al_2O_3powder additive on sintering behaviors of alumina ceramics,such as volume density,water-absorbing rate,porosity,linear shrinkage.The results show that sintering characteristic of Al_2O_3ceramics may be improved and its sintering temperature decreased by using nano-Al_2O_3powder as an additive,linear shrinkage rate increases with the sintering temperature and content of nano-Al_2O_3powder rising up.When the content of nano-Al_2O_3powder is 40%,dense Al_2O_3ceramics will be sintered below 1 550 ℃.
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Alumina ceramic
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The sintering of alumina ceramics with high-purity has gained much attention due to their wide range applications. The improved sinteirng methods, such as the spark plasma sintering, super-high pressure sintering, two-step sintering, and so on, have advantages on the decreasing the sinteirng temperature or inhibiting the grain coarsening, compared with the conventional sintering.
Spark Plasma Sintering
Alumina ceramic
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Stereolithography (SLA), the first form of additive manufacturing, creates 3D objects by selectively solidifying liquid resin via a photopolymerization reaction. Stereolithography has gained popularity due to its ability to fabricate objects with high accuracy and in a wide range of materials. SLA has undergone four generations of major technological innovation since its invention in the 1980s. As a result of these advancements, a diverse range of stereolithography systems with dramatically improved resolution, throughput, and material selection for creating complex 3D objects and devices is now available.
Stereolithography
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