Ion Beam Surface Treatment: A New Technique for Thermally Modifying Surfaces Using Intense, Pulsed Ion Beams

Abstract

The emerging capability to produce high average power (10-300 kW) pulsed ion beams at 0.2-2 MeV energies is enabling us to develop a new, commercial-scale thermal surface treatment technology called Ion Beam Surface Treatment (IBEST). This new technique uses high energy, pulsed (</- 500 ns) ion beams to directly deposit energy in the top 1-20 micrometers of the surface of any material. The depth of treatment is controllable by varying the ion energy and species. Deposition of the energy in a thin surface layer allows melting of the layer with relatively small energies (1-10 J/cm2 ) and allows rapid cooling of the melted layer by thermal conduction into the underlying substrate. Typical cooling rates of this process (109 K/sec) are sufficient to cause ' amorphous layer formation and the production of non-equilibrium microstructures (nanocrystalline and metastable phases). Results from initial experiments confirm surface hardening, amorphous layer and nanocrystalline grain size formation, corrosion resistance in stainless steel and aluminum, metal surface polishing, controlled melt of ceramic surfaces, and surface cleaning and oxide layer removal as well as surface ablation and redeposition. These results follow other encouraging results obtained previously in Russia using single pulse ion beam systems. Potential commercialization of this surface treatment capability is made possible by the combination of two new technologies, a new repetitive high energy pulsed power capability (0.2- 2 MV, 25-50 kA, 60 ns, 120Hz) developed at SNL, and a new repetitive ion beam system developed at Cornell University.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1995
Accession Number
ADA639665

Entities

People

  • D. J. Rej
  • E. L. Neau
  • Ian Boyd
  • John B. Greenly
  • K. P. Lamppa
  • M. O. Thompson
  • M. T. Crawford
  • R. G. Buchheit
  • R. W. Stinnett
  • T. J. Renk

Organizations

  • Sandia National Laboratories

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Corrosion
  • Corrosion Resistance
  • Energy
  • High Energy
  • Lasers
  • Materials
  • Materials Processing
  • Materials Science
  • Metals
  • Pulsed Power
  • Resistance
  • Stainless Steel
  • Steel
  • Surface Finishing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Pulsed Power and Plasma Physics.
  • Thin Film Deposition Science.