Grey modeling for thermal spray processing parameter analysis

2020 ◽  
Vol 10 (3) ◽  
pp. 265-279 ◽  
Author(s):  
Meimei Liu ◽  
Yicha Zhang ◽  
Wenjie Dong ◽  
Zexin Yu ◽  
Sifeng Liu ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Processing Parameters ◽  
Industrial Applications ◽  
Parameter Analysis ◽  
Processing Parameter ◽  
Content Type ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Non Linear ◽  
Spray Processing

PurposeThis paper presents the application of grey modeling for thermal spray processing parameter analysis in less data environment.Design/methodology/approachBased on processing knowledge, key processing parameters of thermal spray process are analyzed and preselected. Then, linear and non-linear grey modeling models are integrated to mine the relationships between different processing parameters.FindingsModel A reveals the linear correlation between the HVOF process parameters and the characterization of particle in-flight with average relative errors of 9.230 percent and 5.483 percent for velocity and temperature.Research limitations/implicationsThe prediction accuracies of coatings properties vary, which means that there exists more complex non-linear relationship between the identified input parameters and coating results, or more unexpected factors (e.g. factors from material side) should be further investigated.Practical implicationsAccording to the modeling case in this paper, method has potential to deal with other diverse modeling problems in different industrial applications where challenge to collecting large quantity of data sets exists.Originality/valueIt is the first time to apply grey modeling for thermal spray processing where complicated relationships among processing parameters exist. The modeling results show reasonable results to experiment and existing processing knowledge.

Optimization of Plasma Spray Processing Parameters for Deposition of Nanostructured Powders for Coating Formation

2006 ◽  
Vol 128 (2) ◽  
pp. 394-401 ◽  
Author(s):  
I. Ahmed ◽  
T. L. Bergman
Keyword(s):  
Thermal Spray ◽  
Liquid Fraction ◽  
Processing Parameters ◽  
Processing Parameter ◽  
Molten Material ◽  
Spray Coatings ◽  
Coating Formation ◽  
Powder Particles ◽  
Spray Processing ◽  
Change Response

When nanostructured powder particles are used for thermal spray coatings, the retention of the original nanostructure that is engineered into the raw stock is a principal objective, along with production of some molten material in order to adhere the sprayed material to the surface being coated. Therefore, in contrast with spraying conventional powders, complete melting of the nanostructured raw stock is to be avoided. In this study, the melting and resolidification of sprayed material is correlated to a spray processing parameter that has been introduced in the literature by some of the spray processing practitioners. Using computer modeling, processing of zirconia agglomerates with plasma spraying has been simulated. Transition regions for the phase change response of the sprayed material to the thermal processing conditions are identified. The retained nanostructure content and liquid fraction of the sprayed material are correlated to particle diameters, injection velocities, as well as this thermal spray processing parameter. Finally, a novel method to produce desired coatings composed of partially molten material using a bimodal particle size distribution of the sprayed powder is suggested.

Performance of HVOF-Sprayed Carbide Coatings in Aqueous Corrosive Environments

2000 ◽  
Author(s):  
S. Simard ◽  
B. Arsenault ◽  
K. Laul ◽  
M.R. Dorfman
Keyword(s):  
Thermal Spray ◽  
Material Selection ◽  
Corrosive Wear ◽  
Industrial Applications ◽  
Process Technology ◽  
Aqueous Corrosion ◽  
Coating Materials ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Corrosive Environments

Abstract The HVOF technology is well known to provide a wide variety of coating materials having excellent performance characteristics under different aggressive conditions such as wear, erosion by impact of particle and corrosion. Carbides, as a family, constitute a big segment of materials used by the thermal spray industry. Although their material properties may be well known since they are often used in wear or corrosive-wear industrial applications, aqueous corrosion of such coatings are not well characterized. Moreover, thermal spray process technology being in constant evolution, past literature on these coatings may not be directly applicable as newer produced coatings have higher adhesive and cohesive strength. Recent technology allows a better control on density and oxides content that are important parameters to consider for corrosion applications. The success of a coating is related to judicious material selection for various applications. However, the choice of the starting materials for producing a coating is often difficult since there is a lack of data on the corrosion performance of thermal spray coatings. The present paper addresses the performance of various carbide HVOF coatings in terms of corrosion rate and degradation mode in two corrosive environments — HCl and HNO3. Behavior of the coatings is compared using bulk SS316 and SS316 HVOF coating as a benchmark.

Lead-Free Piezoelectric Ceramic Coatings Fabricated by Thermal Spray Process

2017 ◽  
Vol 64 (11) ◽  
pp. 1758-1765 ◽  
Author(s):  
Kui Yao ◽  
Shuting Chen ◽  
Kun Guo ◽  
Chee Kiang Ivan Tan ◽  
Meysam Sharifzadeh Mirshekarloo ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Piezoelectric Ceramic ◽  
Ceramic Coatings ◽  
Lead Free ◽  
Thermal Spray Process ◽  
Spray Process

scholarly journals MATHEMATICAL MODELING OF PARTICLE IMPACT AND SOLIDIFICATION IN A THERMAL SPRAY PROCESS: PARTICLE ‐ SUBSTRATE INTERACTION

2000 ◽  
Vol 5 (1) ◽  
pp. 67-75
Author(s):  
G. Gromyko ◽  
G. Zayats ◽  
A. Sherbaf
Keyword(s):  
Stokes Equations ◽  
Droplet Diameter ◽  
Spray Coating ◽  
Processing Parameters ◽  
Heat Transfer Process ◽  
Navier Stokes ◽  
Liquid Particle ◽  
Navier Stokes Equations ◽  
Thermal Spray Process ◽  
Spray Process

In the present paper a mathematical model of creation plasma spray coating with the given properties is developed. The flattening and simultaneous solidification of a liquid particle upon its impingement onto a solid surface has been mathematically described and numerically simulated. Numerical simulation has been accomplished on the basis of the full Navier‐Stokes equations in cylindrical co‐ordinates. Heat transfer process in particle and substrate has been simulated by 2‐D problem heat conduction taking into account hydrodynamic processes into molten particle and forces of pressure. Particle solidification has been described by means of one‐dimensional Stefan problem. It was investigated the effects of some important processing parameters such as impact velocity, droplet diameter, pressure and temperature of plasma on the flattening and solidification of a single liquid particle. Calculations computational algorithm on the basis of finite‐difference method were created and a complex of applied programs was developed.

A Splats Obtaining System for Thermal Spray Deposits

2007 ◽  
Vol 561-565 ◽  
pp. 1169-1172 ◽  
Author(s):  
W.T. Hsiao ◽  
W.H. Liao ◽  
M.S. Leu ◽  
Cherng Yuh Su
Keyword(s):  
Thermal Spray ◽  
High Velocity ◽  
Glass Substrate ◽  
Single Spot ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Hvof Process

The image of thermal spray splats is difficult to collect due to its high velocity of droplets. Especial in High Velocity Oxy-Fuel (HVOF) process, the process present higher velocity of flame jet correlated to other thermal spray process. The system presents at this article describes a useful splats catching method to obtaining splats during thermal spray deposited. Capabilities and advantages of using this instrument are declared at this theme. The final result presented the instrument caught the single spot of HVOF sprayed splats at sub-micro second. Splats of spot were dispersed well on the glass substrate at the obtaining system, and presented various information of droplets impact at different location on the substrate.

scholarly journals Fabrication and Evaluation of NOx Elimination Coating Photocatalyst by Thermal Spray Process.

2001 ◽  
Vol 19 (3) ◽  
pp. 570-576
Author(s):  
Masahiro FUKUMOTO ◽  
Hiroyuki MURAYAMA ◽  
Young-gyo Jung
Keyword(s):  
Thermal Spray ◽  
Thermal Spray Process ◽  
Spray Process
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