Influence of Plasma Spraying Parameters on Coating Damage

2000 ◽  
Author(s):  
L. Bianchi ◽  
N. Baradel ◽  
N. Llorca-Isern ◽  
G. Bertran-Vidai
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Thermal Cycling ◽  
Plasma Spraying ◽  
Confocal Microscope ◽  
Properties Of Coatings ◽  
Low Viscosity ◽  
Spraying Parameters ◽  
Substrate Properties ◽  
Coating Microstructure

Abstract The influence of plasma spraying parameters on the mechanical properties of coatings has been studied. ZrO2-Y2O3 coatings were sprayed onto stainless steel and aluminium substrates at temperatures of about 75°C and 225°C. An original set of samples, facilitating the measurement of substrate deflection, was used to evaluate the effect of thermal cycling under different spraying conditions. In order to correlate thermal cycling values and mechanical properties to coating microstructure, the coatings were impregnated with low-viscosity resin and examined under a confocal microscope. The results reveal the influence of spraying temperature, substrate properties, and torch-substrate velocity on coating damage.

scholarly journals Investigations of microstructure and selected mechanical properties of Al2O3 + 40 wt.% TiO2 coatings deposited by Atmospheric Plasma Spraying (APS)

2019 ◽  
Vol 91 (8) ◽  
pp. 7-11 ◽  
Author(s):  
Monika Michalak ◽  
Leszek Łatka ◽  
Paweł Sokołowski ◽  
Andrzej Ambroziak
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Good Adhesion ◽  
Spraying Parameters ◽  
Tio2 Coatings

Atmospheric Plasma Spraying (APS) enables deposition of coatings from different materials, including those based on Al2O3 and TiO2. In this work, Al2O3 + 40 wt.% TiO2 coatings were tested. The relationships between mechanical properties, microstructure and spraying parameters (namely: spraying distance and torch scan velocity) were investigated. Commercial -45 + 5 μm powders in agglomerated as- produced state were sprayed onto the stainless steel 1.4301 substrates. The aim of the study was to determine the adhesion, microhardness and roughness of coatings but also to characterize their microstructure. It was observed that coatings sprayed from shorter distance were well melted and revealed good adhesion, but at the same time they were more porous and of lower microhardness than those deposited from the longer spraying distance.

Microstructure, Mechanical and Shielding Properties of Fe67.5Ni23.5B9 Coating / 321 Stainless Steel Laminated Composite by the Air-Plasma Spraying Procedure

2011 ◽  
Vol 295-297 ◽  
pp. 1361-1368
Author(s):  
Wen Feng Yang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Plasma Spraying ◽  
Laminated Composite ◽  
Radiation Shielding ◽  
X Rays ◽  
Shielding Effectiveness ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Γ Rays

To meet the requirements of integrative mechanical properties and shielding effectiveness of nuclear radiations shielding materials, the boron-rich shielding coating (Fe67.5Ni23.5B9, in wt. %) were produced onto 321 stainless steel substrate (SS) by the air-plasma spraying technology. This type of coating-SS laminated composite will be likely to be used as protection against neutrons and γ rays from radiation shielding systems. The microstructure was characterized by scanning electron microscope (SEM), energy-dispersive spectrometry (EDS) and X-rays diffraction (XRD). The mechanical properties of Fe67.5Ni23.5B9 coatings were investigated, including adhesion strength, tensile properties and residual stress. The shielding effectiveness of the coating-SS laminated composite, including the slowing down of fast-speed neutrons, absorption for 0.4ev below thermal neutrons and the attenuation against 60Co and 137Cs γ rays were investigated. The results show that the produced Fe67.5Ni23.5B9 coatings-SS laminated composite possess homogeneous microstructure, satisfactory integrative mechanical properties and shielding effectiveness which testify the possible application in radiation shielding systems.

Composite Coatings Elaborated by Plasma Spraying of Dry Coated Particles

2007 ◽  
Vol 560 ◽  
pp. 67-72 ◽  
Author(s):  
R. Cuenca-Alvarez ◽  
H. Ageorges ◽  
Pierre Fauchais
Keyword(s):  
Stainless Steel ◽  
Plasma Spraying ◽  
Composite Coatings ◽  
Metallic Matrix ◽  
Oxide Content ◽  
Properties Of Coatings ◽  
Ceramic Particles ◽  
Metallic Particles ◽  
Particle Coating ◽  
Α Al2o3

The influence of dry particle coating on the properties of coatings produced by d.c. arc plasma spraying is reported. A mechanofusion process is used to coat coarser metallic particles with fine ceramic particles without using either binders or solvents. The key parameters affecting the mechanofusion process and the corresponding plasma spraying method have been varied in order to increase the hardness of the resulting composite coatings. Efforts have been made to disperse homogeneously hard particles (α-Al2O3, SiC) into a metallic matrix (316L stainless steel) and check if it is possible to limit the oxidation of metallic particles during their flight in the plasma jet flowing in air. The hardness of resulting composite coatings depends on the metallic particle size even when the hard ceramic particles are homogenously dispersed into the metallic matrix. Spraying mechanofused powder composed of finer stainless steel particles (64 ,m), results in finer structured deposits that show a higher oxide content. On the contrary, a low oxidation rate of the metallic matrix is observed when coarser metallic particles (120 ,m), covered by a binary layer of α-Al2O3 and SiC are sprayed.

Microstructure and Mechanical Properties of TiO2 Coatings Prepared by Plasma Spray Technique

2017 ◽  
Vol 264 ◽  
pp. 165-168
Author(s):  
Mohamad Siti Mariam ◽  
M.N. Ahmad Fauzi ◽  
Abdullah Ahmad Nizam
Keyword(s):  
Mechanical Properties ◽  
Plasma Spraying ◽  
Adhesion Strength ◽  
Plasma Spray ◽  
Anatase Phase ◽  
Input Power ◽  
Microstructure And Mechanical Properties ◽  
Spraying Parameters ◽  
Spray Technique ◽  
Strong Adhesion

Plasma spray technique is used to produce coatings with excellent hardness, wear resistance and strong adhesion. TiO2 coatings were prepared by plasma spraying at low plasma power.TiO2 powder with anatase phase structure was used to prepare the coatings. The effect of plasma spraying parameters on the microstructure and mechanical properties of the coatings were investigated. The microstructure of the coatings showed that the coatings were formed by fully and partially melted particles. The coatings dominant phase is rutile and only a few coatings contained traces of anatase phase. The hardness and adhesion strength of the coatings were tested using Vickers microhardness and pull-off adhesion tester. The adhesion strength obtained was between 10-20 MPa and the microhardness result is between 300 - 800 Hv. The spraying parameters such as input power, spraying distance and plasma gas ratio influenced the properties of the produced coatings.

Microstructural study of plasma sprayed hydroxyapatite coatings

2017 ◽  
Vol 2 (83) ◽  
pp. 79-84
Author(s):  
S. Kowalski ◽  
R. Belka ◽  
W. Żórawski ◽  
M. Sztorc ◽  
A. Góral ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plasma Spraying ◽  
Peak Height ◽  
Maximum Height ◽  
Properties Of Coatings ◽  
Plasma System ◽  
Ha Coating ◽  
Microstructure And Mechanical Properties ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed

Purpose: The aim of this study is to present microstructure and mechanical properties of hydroxyapatite coatings sprayed by means novel plasma system with axially injection of powder. Design/methodology/approach: Coatings were deposited with Axial III plasma spraying system and examined by SEM, XRD and by a nanoindentation technique (Nanovea) with a Berkovitz indenter. Surface of coatings was analysed by means of a Talysurf CCI-Lite non-contact 3D profiler. Findings: This study shows the microstructure and mechanical properties of hydroxyapatite coatings (HA) obtained by plasma spraying from the powder with a cauliflower-like high porous structure consisting of nanograins with dimension below 100 nm. The cross-section of plasma sprayed HA coating reveals lamellar structure containing pores in the interior of the lamellae. Moreover, between lamellae, some microcracks were detected. Hardness and elastic modulus measured by nanoindentation were found to be around 0.085 and 6.82 GPa respectively, what was comparable with HA coatings sprayed by a modified cold spray system. Both XRD patterns are practically identical, so no new phases were created in hydroxyapatite coating in comparison with feedstock powder during the spray process. High values of a geometry of HA coating; maximum peak height, maximum pit height and maximum height confirmed significant roughening of a surface, which is a result of the interaction of melted powder grains with the surfaces during the plasma spraying. Research limitations/implications: Obtained properties of coatings will be the base for comparison with suspension plasma sprayed coatings. Practical implications: Hydroxyapatite coatings deposited by means novel plasma system are designated for spraying implants. Originality/value: Properties of hydroxyapatite coatings plasma sprayed with novel axially injection of powder.

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