Drop-on-Demand Solder Droplet Jetting System for Fabricating Microstructure

Lee, Taik-Min; Kang, Tae Goo; Yang, Jeong-Soon; Jo, Jeongdai; Kim, Kwang-Young; Choi, Byung-Oh; Kim, Dong-Soo

doi:10.1109/tepm.2008.926285

Cited by 72 publications

(32 citation statements)

References 11 publications

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“…As shown in Fig. 8a, DoD printing of solder columns with a height up to 30 mm with a column width between 500 lm and 1 mm was possible, resulting in aspect ratios of 30-60, which corresponds well to results of Lee et al (2008), who report aspect ratios of 22 in their study. Figure 8b depicts, printed cylindrical structures that have been created in the continuous dispensing mode by a constant rotating motion of the substrate table.…”

Section: Discussionsupporting

confidence: 86%

Pneumatic dispensing of nano- to picoliter droplets of liquid metal with the StarJet method for rapid prototyping of metal microstructures

Tropmann

Lass

Paust

et al. 2011

Microfluid Nanofluid

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This study presents a new, simple and robust, pneumatically actuated method for the generation of liquid metal micro droplets in the nano-to picoliter range. The so-called StarJet dispenser utilizes a star-shaped nozzle geometry that stabilizes liquid plugs in its center by means of capillary forces. Single droplets of the liquid metal can be pneumatically generated by the interaction of the sheathing gas flow in the outer grooves of the nozzle and the liquid metal. For experimental validation, a print head was build consisting of silicon chips with a star-shaped nozzle geometry and a heated actuator (up to 280°C). The silicon chips are fabricated by Deep Reactive Ion Etching (DRIE). Chip designs with different star-shaped geometries were able to generate droplets with diameters in the range of the corresponding nozzle diameters. The StarJet can be operated in two modes: Either continuous droplet dispensing mode or drop on demand (DoD) mode. The continuous droplet generation mode for a nozzle with 183 lm diameter shows tear-off frequencies between 25 and 120 Hz, while droplet diameters remain constant at 210 lm for each pressure level. Metal columns were printed with a thickness of 0.5-1.0 mm and 30 mm height (aspect ratio [30), to demonstrate the directional stability of droplet ejection and its potential as a suitable tool for direct prototyping of the metal microstructures.

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Section: Discussionsupporting

confidence: 86%

Pneumatic dispensing of nano- to picoliter droplets of liquid metal with the StarJet method for rapid prototyping of metal microstructures

Tropmann

Lass

Paust

et al. 2011

Microfluid Nanofluid

View full text Add to dashboard Cite

show abstract

“…Then Arun Kumar and Ting (2006) at MicroFab Technologies Inc. successfully commercialized this technique to deposit BGA bumps, solder optical devices and print electronic circuits. Fan et al (2008), Lee et al (2008) and Cheng et al (2005) also developed solder droplet generators to deposit solder droplets. The basic theory of the solder droplet generation, deposition and spread is another research focus.…”

Section: Introductionmentioning

confidence: 99%

Printing solder droplets for micro devices packages using pneumatic drop-on-demand (DOD) technique

Luo

Zhong

et al. 2012

Journal of Materials Processing Technology

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“…Researchers have developed some direct metal forming methods using powerful energy sources such as laser engineering net shaping [2], selective laser melting [3], directed light fabrication [4], electron-beam solid fabrication [5] and plasma deposition manufacture [6]. With their low cost and high competitiveness, droplet-based technologies have been developed to be used in manufacturing process [7], electronics [8] and optics [9,10], etc. Continuous uniform droplets spraying technology, as one of the modern droplet-based technologies, is considered as an effective and low cost method for fabricating parts because it can deposit material without expensive equipments comparing to the above direct metal prototyping methods [7].…”

Section: Introductionmentioning

confidence: 99%

Study on stable delivery of charged uniform droplets for freeform fabrication of metal parts

Luo

Zhou

et al. 2011

Sci. China Technol. Sci.

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Electrostatic delivery of charged uniform metal droplets is a novel method to deposit metal parts with short process period and low cost. But the delivery process is unstable and delivery accuracy of charged droplets deteriorates because of actions of mutual interactions of closely charged droplets. A droplet generator with droplet charging and deflecting system has been established to find out the way for stably and accurately deflecting droplets. The parameters for generating uniform droplets were first studied. Then the droplet deflections and metal parts depositions with different charge methods were discussed. The results show that the unbalanced electrostatic repelling forces are the main factor to cause the unstable deflection of droplets. The droplets deflection distance can be predicted and controlled by balancing the repelling forces of charged droplets. The metal parts are stably deposited after combining the board charged pulse and substrate motion, indicating that the work can provide useful theoretical and experimental guide for droplet-based freeform fabrication. electrostatic delivery, uniform metal droplets, metal parts, freeform fabrication Citation: Luo J, Qi L H, Zhou J M, et al. Study on stable delivery of charged uniform droplets for freeform fabrication of metal parts.

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Drop-on-Demand Solder Droplet Jetting System for Fabricating Microstructure

Cited by 72 publications

References 11 publications

Pneumatic dispensing of nano- to picoliter droplets of liquid metal with the StarJet method for rapid prototyping of metal microstructures

Pneumatic dispensing of nano- to picoliter droplets of liquid metal with the StarJet method for rapid prototyping of metal microstructures

Printing solder droplets for micro devices packages using pneumatic drop-on-demand (DOD) technique

Study on stable delivery of charged uniform droplets for freeform fabrication of metal parts

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