A Model Study of Powder Particle Size Effects in Cold Spray Deposition

Abstract

The importance of high velocity for good particle deposition efficiency in the cold spray process is well known. Small particles achieve high velocities during nozzle acceleration, but also decelerate rapidly in the flow downstream of the bow shock wave. This study examines the effect of particle size on velocity and deposition efficiency in the cold spray process by means of flow modeling and gas-particle dynamics. Particle trajectories are modeled from the nozzle chamber to the impact with the substrate. Optimum particle size is identified for various particle characteristics and spray configurations.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2008
Accession Number
ADA504175

Entities

People

  • D. Helfritch
  • V. Champagne

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Bow Shock
  • Copper
  • Diameters
  • Gas Flow
  • Geometry
  • Heat Capacity
  • Heat Transfer
  • Mach Number
  • Materials
  • Mechanics
  • Particle Size
  • Shock
  • Shock Waves
  • Standards
  • Substrates
  • Tensile Strength
  • Thermal Spraying

Readers

  • Aerosol Science/Aerosol Physics
  • Combustion Dynamics and Shock Wave Physics.
  • Combustion and Flow Dynamics.