Material processing with a high frequency millimeter-wave source

D. Lewis, M. A. Imam, L. K. Kurihara, A. W. Fliflet, A. Kinkead, Scott Miserendino, S. Egorov, R. W. Bruce, S. Gold, A. M. Jung

Research output: Contribution to journalArticlepeer-review

Abstract

A millimeter-wave beam based on a 15-kW, continuous-wave, 83-GHz gyrotron with superconducting magnets system is being investigated for use in material processing. The millimeter-wave beam can be focused to a few millimeters and manipulated quasi-optically and has been used in the following experiments: joining of ceramics (both similar and dissimilar materials), brazing of poled piezoelectric ceramics without significant heating and depoling, and coating of metals and polymers. Joining has been done directly and with reactive brazes. In coating, the beam's short wavelength and absorption depth permit effective ceramic-coating deposition on lower temperature materials, e.g., polymers and metals, without significant substrate beating, and localized deposition of coatings as well. Finally, the millimeter-wave source has been used in the efficient production of nanophase metal and ceramic powders, via a greatly accelerated modified polyol process producing smaller powders of greater uniformity. The results and implications of the various experiments will be discussed with some theoretical calculations and modeling.

Original languageEnglish (US)
Pages (from-to)151-168
Number of pages18
JournalMaterials and Manufacturing Processes
Volume18
Issue number2
DOIs
StatePublished - Mar 2003
Externally publishedYes

Keywords

  • Atmosphere control
  • Coating
  • Gyrotron
  • High frequency
  • Joining
  • Material synthesis
  • Materials processing
  • Millimeter-wave
  • Quasi-optical
  • Sintering

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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