The Experts below are selected from a list of 4782 Experts worldwide ranked by ideXlab platform
Haiqing Gong - One of the best experts on this subject based on the ideXlab platform.
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thermal analysis of layer formation in a stepless rapid Prototyping Process
Applied Thermal Engineering, 2004Co-Authors: Wenbin Hong, Haiqing GongAbstract:This paper presents a thermal analysis of forming the top layer of a five-layer part made using a stepless rapid Prototyping Process, which cures successive layers of liquid polymer through exposure to UV light. A computer model is created to simulate the kinetics of the UV light induced photo-polymerization; the heat transfer in the curing stage and the Process after UV curing have been established. A temperature profile in the UV curing was obtained through the simulation. It was found that temperature in the top layer rose very rapidly upon exposure to the UV radiation, and reached the maximum point near 100 °C at the end of curing. After the UV lamp was turned off, the layer temperature dropped quickly to room temperature due to convection. An in situ 2D thermal imaging experiment was conducted to verify the simulation results. It showed that the modeling agreed well with the experimental results.
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Thermal analysis of layer formation in a stepless rapid Prototyping Process
Applied Thermal Engineering, 2004Co-Authors: Wenbin Hong, Yong Tsui Lee, Haiqing GongAbstract:This paper presents a thermal analysis of forming the top layer of a five-layer part made using a stepless rapid Prototyping Process, which cures successive layers of liquid polymer through exposure to UV light. A computer model is created to simulate the kinetics of the UV light induced photo-polymerization; the heat transfer in the curing stage and the Process after UV curing have been established. A temperature profile in the UV curing was obtained through the simulation. It was found that temperature in the top layer rose very rapidly upon exposure to the UV radiation, and reached the maximum point near 100 °C at the end of curing. After the UV lamp was turned off, the layer temperature dropped quickly to room temperature due to convection. An in situ 2D thermal imaging experiment was conducted to verify the simulation results. It showed that the modeling agreed well with the experimental results. © 2003 Elsevier Ltd. All rights reserved.
Thierry Chartier - One of the best experts on this subject based on the ideXlab platform.
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3D fine scale ceramic components formed by ink-jet Prototyping Process
Journal of the European Ceramic Society, 2005Co-Authors: Rosa Noguera, Martine Lejeune, Thierry ChartierAbstract:Different investigations have been carried out to optimize an ink-jet printing technique, devoted to the fabrication of 3D fine scale ceramic parts, by adjustment of the fluid properties of the ceramic suspensions and by controlling the ejection and impact phenomena. A 10 vol.% PZT loaded suspension characterized by a Newtonian behavior corresponding to a viscosity of 10 mPa s and to a ratio Re/We1/2 of 5.98 has been selected. The ejection and impact phenomena strongly depend on the driving parameters of the printing head, in particular the formation of the droplet, with satellite or not, as well as its velocity and volume are function of the pulse amplitude. Moreover, the conditions of ejection (droplet velocity and volume) control the characteristics of the deposit (definition, spreading and thickness uniformity). Green PZT pillar array corresponding to the skeleton of 1-3 ceramic polymer composite for imaging probes has been achieved by ink-jet printing with a definition equal to 90 ?m. © 2005 Elsevier Ltd. All rights reserved.
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Fabrication of 3D fine scale PZT components by ink-jet Prototyping Process
Journal de Physique IV (Proceedings), 2005Co-Authors: Rosa Noguera, Martine Lejeune, C. Dossou-yovo, Thierry ChartierAbstract:Different investigations have been carried out to optimize an ink-jet printing technique, devoted to the fabrication of 3D fine scale PZT parts, by adjustment of the fluid properties of the ceramic suspensions and by controlling the ejection and impact phenomena. A 10 vol% PZT loaded suspension characterized by a Newtonian behavior, corresponding to a viscosity of 10 mPa.s and to a ratio Re/We(1/2) of 5.98 has been selected. The ejection and impact phenomena strongly depend on the driving parameters of the printing head, in particular the formation of the droplet, with satellite or not, as well as its velocity and,volume which are function of the pulse amplitude. Moreover, the conditions of ejection (droplet velocity and volume) control the characteristics of the deposit (definition, spreading, thickness uniformity). Sintered PZT pillar array has been achieved by ink-jet printing with a definition equal to 50 mu m. These structures could be very useful to improve the performances of 1-3 ceramic polymer composites for imaging probes or more generally for ultrasonic transducers and also of micro-deformable mirrors for optical adaptive systems.
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3d fine scale ceramic components formed by ink jet Prototyping Process
Journal of The European Ceramic Society, 2005Co-Authors: Rosa Noguera, Martine Lejeune, Thierry ChartierAbstract:Abstract Different investigations have been carried out to optimize an ink-jet printing technique, devoted to the fabrication of 3D fine scale ceramic parts, by adjustment of the fluid properties of the ceramic suspensions and by controlling the ejection and impact phenomena. A 10 vol.% PZT loaded suspension characterized by a Newtonian behavior corresponding to a viscosity of 10 mPa s and to a ratio Re / We 1/2 of 5.98 has been selected. The ejection and impact phenomena strongly depend on the driving parameters of the printing head, in particular the formation of the droplet, with satellite or not, as well as its velocity and volume are function of the pulse amplitude. Moreover, the conditions of ejection (droplet velocity and volume) control the characteristics of the deposit (definition, spreading and thickness uniformity). Green PZT pillar array corresponding to the skeleton of 1–3 ceramic polymer composite for imaging probes has been achieved by ink-jet printing with a definition equal to 90 μm.
Wenbin Hong - One of the best experts on this subject based on the ideXlab platform.
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thermal analysis of layer formation in a stepless rapid Prototyping Process
Applied Thermal Engineering, 2004Co-Authors: Wenbin Hong, Haiqing GongAbstract:This paper presents a thermal analysis of forming the top layer of a five-layer part made using a stepless rapid Prototyping Process, which cures successive layers of liquid polymer through exposure to UV light. A computer model is created to simulate the kinetics of the UV light induced photo-polymerization; the heat transfer in the curing stage and the Process after UV curing have been established. A temperature profile in the UV curing was obtained through the simulation. It was found that temperature in the top layer rose very rapidly upon exposure to the UV radiation, and reached the maximum point near 100 °C at the end of curing. After the UV lamp was turned off, the layer temperature dropped quickly to room temperature due to convection. An in situ 2D thermal imaging experiment was conducted to verify the simulation results. It showed that the modeling agreed well with the experimental results.
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Thermal analysis of layer formation in a stepless rapid Prototyping Process
Applied Thermal Engineering, 2004Co-Authors: Wenbin Hong, Yong Tsui Lee, Haiqing GongAbstract:This paper presents a thermal analysis of forming the top layer of a five-layer part made using a stepless rapid Prototyping Process, which cures successive layers of liquid polymer through exposure to UV light. A computer model is created to simulate the kinetics of the UV light induced photo-polymerization; the heat transfer in the curing stage and the Process after UV curing have been established. A temperature profile in the UV curing was obtained through the simulation. It was found that temperature in the top layer rose very rapidly upon exposure to the UV radiation, and reached the maximum point near 100 °C at the end of curing. After the UV lamp was turned off, the layer temperature dropped quickly to room temperature due to convection. An in situ 2D thermal imaging experiment was conducted to verify the simulation results. It showed that the modeling agreed well with the experimental results. © 2003 Elsevier Ltd. All rights reserved.
Rosa Noguera - One of the best experts on this subject based on the ideXlab platform.
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3D fine scale ceramic components formed by ink-jet Prototyping Process
Journal of the European Ceramic Society, 2005Co-Authors: Rosa Noguera, Martine Lejeune, Thierry ChartierAbstract:Different investigations have been carried out to optimize an ink-jet printing technique, devoted to the fabrication of 3D fine scale ceramic parts, by adjustment of the fluid properties of the ceramic suspensions and by controlling the ejection and impact phenomena. A 10 vol.% PZT loaded suspension characterized by a Newtonian behavior corresponding to a viscosity of 10 mPa s and to a ratio Re/We1/2 of 5.98 has been selected. The ejection and impact phenomena strongly depend on the driving parameters of the printing head, in particular the formation of the droplet, with satellite or not, as well as its velocity and volume are function of the pulse amplitude. Moreover, the conditions of ejection (droplet velocity and volume) control the characteristics of the deposit (definition, spreading and thickness uniformity). Green PZT pillar array corresponding to the skeleton of 1-3 ceramic polymer composite for imaging probes has been achieved by ink-jet printing with a definition equal to 90 ?m. © 2005 Elsevier Ltd. All rights reserved.
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Fabrication of 3D fine scale PZT components by ink-jet Prototyping Process
Journal de Physique IV (Proceedings), 2005Co-Authors: Rosa Noguera, Martine Lejeune, C. Dossou-yovo, Thierry ChartierAbstract:Different investigations have been carried out to optimize an ink-jet printing technique, devoted to the fabrication of 3D fine scale PZT parts, by adjustment of the fluid properties of the ceramic suspensions and by controlling the ejection and impact phenomena. A 10 vol% PZT loaded suspension characterized by a Newtonian behavior, corresponding to a viscosity of 10 mPa.s and to a ratio Re/We(1/2) of 5.98 has been selected. The ejection and impact phenomena strongly depend on the driving parameters of the printing head, in particular the formation of the droplet, with satellite or not, as well as its velocity and,volume which are function of the pulse amplitude. Moreover, the conditions of ejection (droplet velocity and volume) control the characteristics of the deposit (definition, spreading, thickness uniformity). Sintered PZT pillar array has been achieved by ink-jet printing with a definition equal to 50 mu m. These structures could be very useful to improve the performances of 1-3 ceramic polymer composites for imaging probes or more generally for ultrasonic transducers and also of micro-deformable mirrors for optical adaptive systems.
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3d fine scale ceramic components formed by ink jet Prototyping Process
Journal of The European Ceramic Society, 2005Co-Authors: Rosa Noguera, Martine Lejeune, Thierry ChartierAbstract:Abstract Different investigations have been carried out to optimize an ink-jet printing technique, devoted to the fabrication of 3D fine scale ceramic parts, by adjustment of the fluid properties of the ceramic suspensions and by controlling the ejection and impact phenomena. A 10 vol.% PZT loaded suspension characterized by a Newtonian behavior corresponding to a viscosity of 10 mPa s and to a ratio Re / We 1/2 of 5.98 has been selected. The ejection and impact phenomena strongly depend on the driving parameters of the printing head, in particular the formation of the droplet, with satellite or not, as well as its velocity and volume are function of the pulse amplitude. Moreover, the conditions of ejection (droplet velocity and volume) control the characteristics of the deposit (definition, spreading and thickness uniformity). Green PZT pillar array corresponding to the skeleton of 1–3 ceramic polymer composite for imaging probes has been achieved by ink-jet printing with a definition equal to 90 μm.
Regina Knitter - One of the best experts on this subject based on the ideXlab platform.
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ceramic microfabrication by rapid Prototyping Process chains
Sadhana-academy Proceedings in Engineering Sciences, 2003Co-Authors: Regina Knitter, Werner BauerAbstract:Fabrication of micropatterned ceramics or ceramic microparts make high demands on the precision and resolution of the moulding Process. As finishing of miniaturised or micropatterned ceramic components is nearly impossible, shaping has to be done by a replication step in the green, unfired state. To avoid high tooling costs in product development, a rapid Prototyping Process chain has been established that enables rapid manufacturing of ceramic microcomponents from functional models to small lot series within a short time. This Process chain combines the fast and inexpensive supply of master models by rapid Prototyping with accurate and flexible ceramic manufacturing by low-pressure injection moulding. Besides proper feedstock preparation and sufficient small grain size, the quality of the final components is mainly influenced by the quality of the master model. Hence, the rapid Prototyping method must be carefully selected to meet the requirements of the component to be fabricated.
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Ceramic microfabrication by rapid Prototyping Process chains
2003Co-Authors: Regina Knitter, Werner BauerAbstract:The fabrication of micropatterned ceramics or ceramic microparts make high demands to the precision and resolution of the moulding Process. As the finishing of miniaturised or micropatterned ceramic components are nearly impossible, the shaping has to be done by a replication step in the green, unfired state. To avoid high tooling costs in product development, a rapid Prototyping Process chain has been established that enables the rapid manufacturing of ceramic microcomponents from functional models to small lot series within a short time. This Process chain combines the fast and inexpensive supply of master models by rapid Prototyping with the accurate and flexible ceramic manufacturing by low-pressure injection moulding. Besides a proper feedstock preparation and a sufficient small grain size the quality of the final components is mainly influenced by the quality of the master model. Hence, the rapid Prototyping method must be carefully selected to meet the requirements of the component to be fabricated.
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Microfabrication of ceramics by rapid Prototyping Process chains
Journal of Mechanical Engineering Science, 2003Co-Authors: Regina Knitter, Werner Bauer, Dieter GöhringAbstract: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 ? exibility 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 signi? cance for the quality and reproducibility of the ceramic mouldings.
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Development of a rapid Prototyping Process chain for the production of ceramic microcomponents
Journal of Materials Science, 2002Co-Authors: Werner Bauer, Regina KnitterAbstract:Cost-intensive and time-consuming manufacturing of new miniaturized or micropatterned ceramic components may profit decisively from the use of rapid Prototyping Processes. However most known generative Processes do not provide a sufficient resolution for the fabrication of microdimensional or micropatterned components or are restricted to polymer materials. In contrast to this, a rapid Prototyping Process chain (RPPC), which combines e.g., micro stereolithography and a low-pressure shaping method using soft molds, allows the rapid manufacturing of ceramic microcomponents from functional models to preliminary or small lot series.
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Ceramic microcomponents by rapid Prototyping Process chains
3rd Conference on Rapid Prototyping, Rapid Tooling and Rapid Manufacturing, 2002Co-Authors: Regina Knitter, Dieter Göhring, Werner Bauer, Peter RisthausAbstract:For the fabrication of ceramic microcomponents a rapid Prototyping Process chain has been developed, combining the fast and inexpensive supply of master models by rapid Prototyping techniques with a flexible and precise ceramic shaping technique. In this Process chain the design is first generated as a three-dimensional CAD model. The master models are realised as polymer parts by different rapid Prototyping techniques, and are then copied into silicone rubber moulds, which can directly be used as tools in low-pressure injection moulding. The final ceramic microcomponents are obtained after debinding and sintering. This Process chain enables the fast, accurate and repeatable production of ceramic microcomponents from functional test components to pilot or small series. It is suited for shaping filigree patterning details in the submillimetre range but also enables the fabrication of components with outer dimensions of several centimetres. The quality of the ceramic parts is mostly affected by the quality of the master model.
