Effect of substrate preparation on flattening of plasma sprayed aluminium bronze powders

Abstract

International audiencePlasma spray coatings are produced by introducing powder particles of the material into a plasma plume, which melts and forwards them to the substrate. The flattening process of these individual molten droplets is one of the most critical factors as the coating quality strongly depends on the deposition of individual particles. Powders of aluminium bronze, a fine (−53 + 11 μ m) and a coarse one (−125 + 45 μm) were plasma sprayed onto stainless steel substrates (AISI 304L) under atmospheric condition with three different substrate temperatures (25, 165 and 270°C). Two different ranges of surface roughness Ra were used: mirror polished substrates with about 0·01-0·03 μm and grit blasted substrates with about 1·89-2·43 μm. A scanning electron microscopy equipped with energy dispersive spectrometry system and an electron probe microanalysis, were used in order to study the splat morphology and the chemical composition of the splats

Sliding friction and wear behaviors of plasma sprayed aluminum-bronze coating in artificial seawater

“…CuAl is a copper‐based alloy with 5–14% Al, which can greatly increase the strength and maintain the friction‐reducing property of the copper matrix. Additionally, through plasma spraying, CuAl coating can be easily deposited on corrosion/wear sensitive substrates with hardly any harmful effect because of the avoidance of intensive heat input during plasma spraying …”

Sensitivity of Process Parameters in Atmospheric Plasma Spray Coating

“…However, an extremely increased roughness of substrate can promote the splashing and/or the oxidation of splats. In contrast, the droplet impact on substrates with smaller roughness is characterized by more splashing as the liquid tends to jet out under the influence of its momentum [48].…”

Ethylene Methacrylic Acid (EMAA) Single Splat Morphology

“…The second factor includes the composition, thickness and morphology of the oxide layer on the surface of the substrate; these are affected by the preheating rate, temperature and time. The thickness of the oxide layer affects the roughness of the substrate [14], and thus modifies the wettability of the substrate [1]. The third factor concerns condensates or adsorbents on the substrate surface.…”