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A Droplet Generator Using Piezoelectric Ceramics to Impact Metallic Pellets.

Jilong Yu1, Daicong Zhang1, Wei Guo1

  • 1School of Mechanical & Electronic Engineering, Xi'an Polytechnic University, Xi'an 710048, China.

Micromachines
|September 28, 2024
PubMed
Summary

A novel drop-on-demand droplet generator ejects metallic pellets in an atmospheric environment, overcoming limitations of existing metal micro-droplet ejection technologies. This device offers a simpler, cost-effective solution for micro-fabrication and electronic packaging.

Keywords:
ejection generatormetallic pellet ejectionnumerical simulationpiezoelectric ceramic

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Area of Science:

  • Materials Science and Engineering
  • Microfabrication Technologies
  • Additive Manufacturing

Background:

  • Metal micro-droplet ejection is crucial for micro-metal part prototyping and microelectronic packaging.
  • Current technologies face challenges including specialized environments, complex feeding, and high costs.

Purpose of the Study:

  • To design and analyze a novel drop-on-demand droplet generator for metallic pellets using impact feed ejection.
  • To develop a cost-effective and structurally simple device for atmospheric micro-droplet ejection.

Main Methods:

  • A micro-channel feeding method utilizing piezoelectric ceramic actuators.
  • Rigid dynamics modeling of metallic pellet flight trajectory.
  • Computational Fluid Dynamics (CFD) simulation using Fluent to analyze melting and ejection processes.

Main Results:

  • Stable droplet generation with a 500 µs pulse width and 1100 mm/s initial velocity.
  • Simulation reveals feeding, melting, and ejection stages taking 39.5 ms, 7.85 ms, and 17.65 ms, respectively.
  • Projected injection frequency of 15 Hz for the metal projectile droplet-generating device.

Conclusions:

  • The developed droplet generator offers a simplified, compact, and cost-effective alternative for metal micro-droplet ejection.
  • The device operates effectively in an atmospheric environment, eliminating the need for micro-oxygen conditions.
  • This technology shows promise for advancing rapid prototyping and microelectronic packaging applications.