Plasma-sprayed Stainless Steel Research Articles

Effect of Inter-Splat Bonding Quality on the Dependence of Wear Behavior of Plasma-Sprayed Stainless Steel Coating on Applied Load

Effect of Inter-Splat Bonding Quality on the Dependence of Wear Behavior of Plasma-Sprayed Stainless Steel Coating on Applied Load

Electrochemical Behavior of Plasma-Sprayed Stainless Steel

The effect of electrochemical behavior of plasma sprayed NiCr–Cr2O3 (80:20) and Al2O3– 40% TiO2 as coating on stainless steel 316L were investigated. The polarization studies were carried out in 1.0M H2SO4 and 3.5% NaCl solution as a corrosive medium. The corrosion potential is more positive in the coated sample and gives good corrosion resistance when compared to bare sample. The surface characterization studies were carried out through electron microscope attached with energy dispersive spectroscopy. It was found that intergranular attack and pitting corrosion takes place in the sample exposed in 1.0M H2SO4 and large crater was found in the sample exposed in 3.5% NaCl solution.

Effect of Oxidation on the Bonding Formation of Plasma-Sprayed Stainless Steel Splats onto Stainless Steel Substrate

Stainless steel splats were deposited on 304 stainless substrates with different thicknesses of oxide layer to examine the effect of substrate oxidation on splat morphology and splat-substrate interface bonding by inert low-pressure plasma spraying. The cross sections of splats showing the splat-substrate interface were prepared by focus ion beam (FIB). The splat morphology and splat-substrate interface bonding state were characterized by scanning electron microscopy. The interface bonding was also examined by an electrolytic etching process. Results showed that with increasing oxide layer thickness and surface roughness, the morphology of splat changed from disk shape to splashed finger-like shape. The examination into the interface bonding by using FIB-prepared cross-sectional samples revealed that the splat interface bonding depended on the oxide roughness and composition. The interface bonding with a ratio of 44% was formed at the inner part of a splat on the pre-oxidized substrate when iron oxide presented on the surface, and the roughness of oxide scale was <5 nm. When the pre-oxidizing temperature exceeded 800 °C, the surface roughness increased to 14 nm and chromium oxide covered the pre-oxidized surface, resulting in no effective bonding forming at the whole interface. Thus, surface roughness and oxide composition have a significant influence on the splat interface bonding formation.

Friction behaviour of plasma-sprayed stainless steel coatings doped with graphite particles

The objective of this study is to achieve, by atmospheric plasma spraying (APS) on aluminium alloy substrates, a coating exhibiting a higher superficial hardness and an improved tribological behaviour in dry friction compared with that of the aluminium alloy. A new process has been developed to incorporate graphite particles in a stainless steel coating during its formation. A special injection system has been developed to deposit graphite particles (2–12 μm in diameter) at the surface close to the spot sprayed with stainless steel in order to incorporate them within the forming coating. Tribological tests have been carried out on a pin-on-disc tribometer. The friction coefficient evolution of this composite coating is compared with that of commonly used stainless steel coatings. Tribological behaviour has been characterized for different test conditions. The dry friction coefficient of this coating against a 100C6 steel pin is reduced by a factor of between 1.5 and 4 compared with that obtained with plasma-sprayed stainless steel, depending on the experimental conditions.

Fatigue Crack Growth Behavior of Alumina Plasma-Sprayed Stainless Steel

Fatigue Crack Growth Behavior of Alumina Plasma-Sprayed Stainless Steel

Thermal conductivity and thermal diffusivity of plasma-sprayed stainless steel

Results are shown of an experimental study concerning the thermal conductivity (over the temperature range 50–400°C) and the thermal diffusivity (over the temperature range 500–1100°C) of plasma-sprayed stainless steel.