Development of Stress Balancing Cold Spray Deposition for Flatness Evaluation

Abstract

Tantalum (Ta) coatings are desired for electromagnetic interference shielding on thin components. Cold spray is an effective means of depositing Ta, but residual compressive stresses can distort thin components out of tight flatness tolerances. The effect of cold spray process parameters on compressive residual stress are studied with the objective of minimizing residual stress and component distortion. In this report, a technique for applying cold spray coatings to balance compressive residual stresses is demonstrated. In a successful demonstration of this technique, a flatness of 0.005 inches was achieved across an 8- 4-inch panel with a total Ta coating thickness of 0.030 inches.

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Document Details

Document Type
Technical Report
Publication Date
May 21, 2019
Accession Number
AD1073778

Entities

People

  • Gehn Ferguson
  • Isaac Nault

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Autonomy
  • Biomedical
  • Sensors

DTIC Thesaurus Topics

  • Coatings
  • Computational Fluid Dynamics
  • Curvature
  • Distortion
  • Electromagnetic Interference
  • Electromagnetic Shielding
  • End Mill
  • Engineering
  • Explosive Welding
  • Geometry
  • Materials
  • Measurement
  • Powders
  • Residual Stress
  • Shielding
  • Thermal Spraying
  • Thickness

Readers

  • Materials Science and Engineering.
  • Nanofabrication and Microfabrication.
  • Pavement Materials Engineering.