Effect of Processing Parameters on the Wear Resistance of Thermally Sprayed Epoxy Coatings

1996 ◽  
Author(s):  
Y. Bao ◽  
D.T. Gawne
Keyword(s):  
Wear Resistance ◽  
Heat Flow ◽  
Plasma Spray ◽  
Spray Deposition ◽  
Processing Parameters ◽  
Crosslinking Reaction ◽  
Epoxy Coatings ◽  
Substrate Preheating ◽  
Low Wear ◽  
Thermally Sprayed

Abstract Plasma spray deposition of epoxies under normal conditions produces coatings with low wear resistance. The research shows that the difficulty in achieving satisfactory properties is a result of the rapid heat flow from the coating to the substrate, which suppresses the crosslinking reaction. The results indicate that the use of substrate preheating or ceramic undercoats enhances the wear resistance by promoting the curing reaction during spraying.

On the Implementation of Neural Network Concept to Optimize Thermal Spray Deposition Process

2001 ◽  
Vol 700 ◽  
Author(s):  
Sofiane Guessasma ◽  
Ghislain Montavon ◽  
Christian Coddet
Keyword(s):  
Plasma Spray ◽  
Numerical Models ◽  
Spray Deposition ◽  
Deposition Process ◽  
Processing Parameters ◽  
Point Of View ◽  
Formation Mechanisms ◽  
Spray Process ◽  
Network Concept ◽  
Coating Formation

AbstractNumerous processing parameters, up to fifty, characterize the plasma spray deposition process. A better quality control of the resulting deposits induces a better understanding of their effects on coating formation mechanisms. Numerical models can help to provide such an understanding. From a mathematical point of view, d.c. plasma spray deposition process is assimilated to a nonlinear problem in regards to its variables (operating parameters, environment, etc.). This paper develops a global approach based on an implicit describing of the mechanisms implementing Artificial Neural Networks (ANNs). The global concept and the protocols to implement are presented and developed for an example related to d.c. plasma spray process.

Experimental and simulation approach to plasma spray deposition of yttrium oxide

2012 ◽  
Vol 28 (9) ◽  
pp. 646-656 ◽  
Author(s):  
T K Thiyagarajan ◽  
P V Ananthapadmanabhan ◽  
K P Sreekumar ◽  
Y Chakravarthy ◽  
A K Das ◽  
...  
Keyword(s):  
Yttrium Oxide ◽  
Plasma Spray ◽  
Spray Deposition ◽  
Simulation Approach

scholarly journals Bulk CoNiFe-SiB Amorphous and Nanostructured Alloys Produced by Plasma Spray Deposition and Dynamic Compaction: Formation of Soft Magnetic Properties

2015 ◽  
Vol 75 ◽  
pp. 1238-1243 ◽  
Author(s):  
Elena Denisova ◽  
Ludmila Kuzovnikova ◽  
Rauf Iskhakov ◽  
Aleksandr Kuzovnikov ◽  
Anatoly Lepeshev ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Plasma Spray ◽  
Spray Deposition ◽  
Dynamic Compaction ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Nanostructured Alloys

ChemInform Abstract: Plasma Spray Deposition of Fine SiC Powder.

ChemInform ◽  
2010 ◽  
Vol 24 (30) ◽  
pp. no-no
Author(s):  
W. X. PAN ◽  
T. OKAMOTO ◽  
Y. MIYAMOTO ◽  
X. S. NING ◽  
H. MATSUMOTO ◽  
...  
Keyword(s):  
Plasma Spray ◽  
Spray Deposition

scholarly journals WEAR RESISTANCE OF EPOXY COATINGS FILLED WITH SYNTHETIC WOLLASTONITE BASED ON RICE HUSK

2021 ◽  
Vol 6 (1) ◽  
pp. 66-73
Author(s):  
E. Gotlib ◽  
Phuong Ha ◽  
A. Hasanova ◽  
E. Galimov
Keyword(s):  
Wear Resistance ◽  
Silicon Dioxide ◽  
Calcium Silicate ◽  
Raw Materials ◽  
Synthesis Temperature ◽  
Chain Structure ◽  
Target Component ◽  
Epoxy Coatings ◽  
Synthetic Wollastonite ◽  
Natural And Synthetic

The extraction of natural wollastonite in the world is limited, so it is relevant to synthesize it on the basis of available calcium and silicon-containing raw materials, and it is promising to use rice husks as a source of silicon dioxide, as a waste of rice processing. Due to the needle shape of the particles, natural wollastonite increases the wear resistance of epoxy coatings, which arouses interest to study the influence of the phase composition and properties of synthetic wollastonite on this property. The calcium silicate synthesized by authors contains β-wollastonite, which is the target component. Its maximum content is achieved at a synthesis temperature not higher than 950 °C, approximately at the level of natural Mivall 10–97. Larnite is found as an impurity in the composition of synthetic wollastonite, it is an island silicate with a chain structure and therefore cannot provide such a modifying effect as fillers with anisodiametric particle shape. The nature of the particle size distribution curves of both natural and synthetic volastonite has two maxima, regardless of the filler synthesis temperature, with the exception of calcium silicate obtained at 900 °C, the particle distribution is narrower than in synthesized fillers, and they are smaller. The wear resistance of epoxy compositions, when filled with both natural and synthetic wollastonite, increases. The greatest increase in this indicator is achieved when using synthetic wollastonite, obtained at a ratio of calcium oxide and silicon dioxide 1: 1 and temperatures of 900-1000 °C. Thus, epoxy materials filled with both natural and synthetic wollastonium obtained at optimal ratios of the initial components and synthesis temperatures can be effectively and economically used as wear-resistant coatings.

Correlating Electrospray Characteristics with Surface Morphology of Calcium Phosphate Coatings Deposited Using Electrostatic Spray Deposition (ESD)

2006 ◽  
Vol 309-311 ◽  
pp. 611-614
Author(s):  
Sander C.G. Leeuwenburgh ◽  
M.C. Heine ◽  
Joop G.C. Wolke ◽  
Sotiris E. Pratsinis ◽  
J. Schoonman ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Spray Deposition ◽  
Morphological Characteristics ◽  
Precursor Solution ◽  
Processing Parameters ◽  
Nozzle Geometry ◽  
Electrostatic Spray Deposition ◽  
Droplet Sizes ◽  
Calcium Phosphate Coatings ◽  
Electrostatic Spray

In situ measurements of electrospray droplet sizes and velocities were performed by Phase Doppler Anemometry during Electrostatic Spray Deposition (ESD) of calcium phosphate (CaP) coatings. Numerous processing parameters were varied (nozzle-to-substrate distance, deposition temperature, nozzle geometry, and composition of the precursor solution), whereafter the morphological characteristics of these ESD-derived CaP coatings were correlated with measured droplet characteristics. Equal droplet sizes and velocities were measured for nozzle-to-substrate distances up to 40 mm and deposition temperatures up to 400 °C, indicating that electrospray droplets did not shrink at all during droplet flight using an involatile solvent butyl carbitol with a high boiling point (Tb = 231 °C). Nevertheless, coatings with considerably different surface morphologies were obtained under these conditions, varying from microporous structures with coalesced pore walls to morphologies revealing isolated rings on top of dense or grainy underlayers. The chemical composition of the precursor solutions and the mixing characteristics of the calcium and phosphate precursor components strongly influenced the initial droplet sizes, precipitation kinetics of the CaP solute, and subsequent coating morphology. Unique, reticular coating morphologies were deposited at a deposition rate of 3.2 µm/hour, which have a graded structure consisting of a dense underlayer, a submicron-porous intermediate layer, and a roughened toplayer revealing droplet-derived features such as isolated rings or coalesced, hollow surface pits.

Characterization of Cr2O3-TiO2-CaF2 Coatings Using Plasma Spray Process

1997 ◽  
Author(s):  
A.Ph. Ilyuschenko ◽  
N.I. Shipica ◽  
P.A. Vityaz ◽  
A.A. Yerstak ◽  
A.Y. Beliaev
Keyword(s):  
Wear Resistance ◽  
Plasma Spray ◽  
Composite Coatings ◽  
Wear Testing ◽  
Material System ◽  
Composite Powders ◽  
Spray Coatings ◽  
Spray Process ◽  
Plasma Spray Coatings ◽  
High Temperature Synthesis

Abstract This paper presents the results of a study on the wear resistance of plasma spray coatings made from Cr2O3-TiO2-CaF2 powders. The composite powders used were produced by self-propagating high temperature synthesis. They were then applied under various conditions in order to optimize the material system, spray process, and application procedures. Based on the results of microstructural examination and wear testing, the thermally sprayed composite coatings have excellent wear resistance, good adhesion, and are self-lubricating at high temperatures.

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