Influence of High-Enthalpy Atmospheric Plasma Spraying Process Parameters on Microwave Dielectric Properties of Y2O3 Coatings

2021 ◽  
Author(s):  
Qi Li ◽  
Jing Hu ◽  
Jianliang Xie ◽  
Xin Wang ◽  
Chengyong Yu ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Plasma Spraying ◽  
Process Parameters ◽  
Microwave Dielectric Properties ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
High Enthalpy ◽  
Microwave Dielectric ◽  
Plasma Spraying Process ◽  
Spraying Process

Correlations Between In-Flight Particle Concentrations and Coating Properties in Atmospheric Plasma Spraying of Alumina

1996 ◽  
Author(s):  
T. Lehtinen ◽  
J. Knuuttila ◽  
J. Vattulainen ◽  
T. Mäntylä ◽  
R. Hernberg
Keyword(s):  
Plasma Spraying ◽  
Powder Particle ◽  
Particle Concentration ◽  
Ccd Camera ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Electrode Wear ◽  
Coating Properties ◽  
Plasma Spraying Process ◽  
Spraying Process

Abstract The plasma spraying process is controlled by various parameters that have an influence on powder particle velocities, temperatures and trajectories just before impact to the substrate. In order to fully utilize the thermal and kinetic energy of the plasma it is important to obtain information from these powder particle properties. In this work an intensified CCD camera has been used to detect in-flight particles in an atmospheric plasma spraying process. Plasma spraying was performed using fused and crushed AI2O3 powder. The powder carrier gas flow rate was varied during the spraying experiments. All the other deposition parameters were kept constant. Coatings produced using relatively new spraygun electrodes are compared with ones produced later with the same electrodes when they were worn out. The particle concentration is determined on a relative scale by the fraction of the area of a CCD camera frame covered by particle images. Further investigations necessary to clearify the relationship between the measured relative particle concentration and the true particle concentration are identified. The coatings are analyzed for wear resistance, degree of melting, deposition efficiency, hardness and porosity. The dependence of these coating properties on the relative particle concentration and the effect of electrode wear on the relative particle concentration are studied.

Integrated Simulation of the Atmospheric Plasma Spraying Process

1998 ◽  
Author(s):  
S. Kundas ◽  
A. Kuzmenkov ◽  
E. Lugscheider ◽  
U. Eritt
Keyword(s):  
Plasma Spraying ◽  
Experimental Verification ◽  
Computer Experiments ◽  
Plasma Jet ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Temperature Dependent ◽  
Integrated Simulation ◽  
Plasma Spraying Process ◽  
Spraying Process

Abstract The main purpose of this work is the development of mathematical and computer models for the integrated simulation of all stages of the atmospheric plasma spraying process (APS) with temperature dependent thermophysical and mechanical properties of the used materials and gases and experimental verification of the simulated results. The following mathematical models of APS were created: particle heating and movement in the plasma jet; coating structure formation; heat transfer and residual stresses in the coating-substrate system. The computer realization of these models enables us to model all stages of APS (integrated or separately). Databases of coating, substrate and plasma-gas substances include the temperature dependent properties. The model of APS is divided in 3 parts, which are connected by continuous data interface. Two dimensional approximation of plasma-gas velocity and temperature in the free plasma jet was used for computation of particle velocity, trajectory and temperature. This information was created with a special Graphic program module and included in database. Computer experiments for plasma spraying of Ah03 and ZrO2+8%Y2O3 in Ar/H2 plasma were carried out. The experimental verification of developed models with High-Velocity-Pyrometry (HVP) and Laser-Doppler- Anemometry (LDA) have shown the satisfactory precision of simulated results.

scholarly journals Swirling Effects in Atmospheric Plasma Spraying Process: Experiments and Simulation

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 388
Author(s):  
Israel Martínez-Villegas ◽  
Alma G. Mora-García ◽  
Haideé Ruiz-Luna ◽  
John McKelliget ◽  
Carlos A. Poblano-Salas ◽  
...  
Keyword(s):  
Hydrogen Plasma ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Plasma Stream ◽  
Spray Cone ◽  
Coating Characteristics ◽  
Computational Fluid Dynamics Cfd ◽  
Particles Trajectories ◽  
Plasma Spraying Process ◽  
Spraying Process

Experimental evidence of swirling effects in 3D trajectories of in-flight particles is presented based on static and dynamic footprints analysis as a function of stand-off distance of Al2O3 deposited employing a Metco-9MB torch. Swirling effects were validated with a proprietary computational fluid dynamics (CFD) code that considers an argon-hydrogen plasma stream, in-flight particles trajectories, both creating the spray cone, and particle impact to form a footprint on a fixed substrate located at different distances up to 120 mm. Static and dynamic footprints showed that swirl produces a slight deviation of individual particle trajectories and thus footprint rotation, which may affect coating characteristics.

Influence of plasma spraying process parameters on properties of the deposited Ni-Al coatings

2001 ◽  
Author(s):  
Sigitas Tamulevicius ◽  
Rytis Dargis ◽  
Pranas Valatkevicius ◽  
Kestutis Slapikas
Keyword(s):  
Plasma Spraying ◽  
Process Parameters ◽  
Plasma Spraying Process ◽  
Spraying Process

Influence of high-enthalpy atmospheric plasma spraying power on oxidation resistance of ZrB2-LaF3 coatings

2021 ◽  
Vol 410 ◽  
pp. 126975
Author(s):  
Jing Hu ◽  
Peng Liu ◽  
Qi Li ◽  
Jianliang Xie ◽  
Shaoliang Jiang ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
High Enthalpy

Plasma Spray of Free-Standing Components for Bone Tissue Engineering

2008 ◽  
Vol 396-398 ◽  
pp. 695-698
Author(s):  
D. García-Alonso ◽  
T. Levingstone ◽  
M. Parco ◽  
Joseph Stokes
Keyword(s):  
Deposition Time ◽  
Research Work ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Spray Parameters ◽  
Average Thickness ◽  
Free Standing ◽  
Optimal Values ◽  
Plasma Spraying Process ◽  
Spraying Process

This research work deals with the development of free-standing hydroxyapatite (HA) components produced using the Atmospheric Plasma Spraying Process. The spray parameters were based on the optimal values found in previous work for the HA powder used. The deposition time used to produce the free-standing coupons was varied between 70 and 150 seconds. The influence of spray time on the deposit thickness and the resulting crystallinity of the coupons were investigated. The surface of the samples was characterised by means of SEM and surface roughness was measured using a laser profiler. The crystallinity of the samples was analysed using XRD. The phase content of the coupons was investigated using XRD and Raman Spectroscopy. The crystallinity and thickness of the coupons was found to increase with increasing spray time. A maximum crystallinity of 89% and maximum average thickness of 2.45 mm were obtained.

Suspension plasma spraying: Process parameters and resulting coating architecture

2007 ◽  
Author(s):  
J.-F. Coudert ◽  
V. Rat ◽  
H. Ageorges ◽  
A. Denoirjean ◽  
P. Fauchais ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Process Parameters ◽  
Suspension Plasma Spraying ◽  
Plasma Spraying Process ◽  
Spraying Process
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