Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9809937 | Surface and Coatings Technology | 2005 | 9 Pages |
Abstract
Copper powders were selected to create splats of a regular disk shape by plasma spraying on a preheated flat substrate surface. Copper powders of a small size range with a regular spherical shape were used to ensure a valid mean particle size. The particle velocity and temperature were measured based on the thermal radiation from particle surface. The flattening degrees were estimated using the average diameter of splats and spray particles for different spray conditions. The relationship between the flattening degree (ξ) and the Reynolds number (Re) for the spray molten droplet was examined experimentally using exponential formulas with different power factors as reported in the literature. The results revealed that the equation ξ=1.21Re0.125 determined by the experimental data rather than other equations with the power factors of 0.2 and 0.25 to Reynolds numbers is applicable to reasonably estimate the flattening degree of the spray molten droplet in a wide range of the Reynolds numbers. This range, from several hundreds to several ten thousands, covers typical molten metallic droplets and oxide ceramic droplets in thermal spraying.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Chang-Jiu Li, Han-Lin Liao, P. Gougeon, G. Montavon, C. Coddet,