scholarly journals THE INFLUENCE OF THERMAL SPRAY PROCESS TECHNOLOGICAL PARAMETERS ON THE PROPERTIES OF COATINGS / TERMINIO PURŠKIMO TECHNOLOGINIŲ PARAMETRŲ POVEIKIS DANGŲ SAVYBĖMS

2017 ◽  
Vol 8 (6) ◽  
pp. 592-595
Author(s):  
Aleksandr Lebedev ◽  
Olegas Černašėjus ◽  
Jelena Škamat
Keyword(s):  
Aluminum Alloy ◽  
Influence Of Spray Parameters ◽  
Spray Parameters ◽  
Technological Parameters ◽  
Properties Of Coatings ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Coating Microstructure ◽  
Pre Treatment ◽  
Plasma Sprayed

The article deals with the plasma sprayed Ni-based coating on aluminum alloy substrates. Before spraying, the surfaces of substrates were modified employing sandblasting and its combination with preheating. The coatings were sprayed under variation of spray process parameters. The study involves coating microstructure, porosity and adhesion tests. The influence of spray parameters and substrate pre-treatment on the properties of coating were evaluated. Straipsnyje nagrinėjamos plazminio purškimo būdu ant aliuminio lydinio substrato užpurkštos Ni pagrindo dangos. Substrato paviršius prieš purškimą buvo apdorotas smėliavimo būdu, taip pat ir pakaitinant substratą iki 150 °C temperatūros. Naudojant skirtingus plazminio purškimo proceso parametrus, buvo užpurkštos nikelio-aliuminio dangos. Darbe ištirta gautų dangų mikrostruktūra, akytumas ir adhezijos stipris. Įvertintas plazminio purškimo parametrų ir substrato paruošimo poveikis gautų dangų savybėms.

The Role of Different Atmospheric Plasma Spray Parameters on Microstructure of Abradable AlSi-Polyester Coatings

2017 ◽  
Vol 270 ◽  
pp. 224-229
Author(s):  
David Jech ◽  
Ladislav Čelko ◽  
Pavel Komarov ◽  
Jindřich Ziegelheim ◽  
Zdeněk Česánek ◽  
...  
Keyword(s):  
Deposition Efficiency ◽  
Atmospheric Plasma ◽  
Spray Parameters ◽  
Technological Parameters ◽  
Coating Microstructure ◽  
Two Parameters ◽  
Plasma Sprayed ◽  
Abradable Coatings ◽  
And Control

One of the approaches to increase the thermic efficiency of aerospace engines is the application of abradable coatings enabling minimization and control of the clearance between the stator and the rotating blades tips. The main purpose of this contribution is to define the role of different technological parameters utilized for atmospheric plasma spraying of AlSi-polyester coating on its resulting microstructure. Deposition of abradable coatings on the real engine parts is mostly dependent on spraying stand-off distance and on spraying angle. These two parameters influence not only the coating microstructure but also the deposition efficiency itself, which is directly connected with economical aspects of the coating production. The set of experimental samples with atmospheric plasma sprayed Ni-based bond coat and two in chemical composition same initial powders delivered from different powder manufacturers were used to spray thick AlSi-polymer top coats with different spraying stand-off distances and angles. Subsequently some of the samples were also heat treated to burn-out the polymer phase from the coating microstructure. The Rockwell HR15Y hardness was measured on all samples and the microstructure and coating thickness were evaluated by means of light microscopy and image analysis methods.

Influence of HVOF Thermal Spray Process on the Microstructures and Properties of Fe-Based Amorphous / Nano Metallic Coatings

2009 ◽  
Vol 633-634 ◽  
pp. 685-694 ◽  
Author(s):  
X.Q. Liu ◽  
Y.G. Zheng ◽  
X.C. Chang ◽  
W.L. Hou ◽  
Jian Qiu Wang
Keyword(s):  
High Performance ◽  
Good Alternative ◽  
Metallic Coating ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Hvof Thermal Spray ◽  
Alternative Material ◽  
High Microhardness ◽  
Coating Microstructure ◽  
Hvof Thermal Spray Process

A new Fe-based amorphous / nano metallic coating with a good combination of high microhardness and excellent erosion corrosion resistance was produced by high velocity oxygen fuel (HVOF). The coating microstructure, amorphous phase content and properties under different HVOF processes were evaluated. It was found that they are very sensitive to the powder feed rate, stand-off distance and oxygen flow. This high performance amorphous / nano metallic coating could be applied as a good alternative material in erosion and corrosion environments.

An Alternative Thermal Spray Process to Plasma Spray in the Aircraft and Stationary Gas Turbine Industry

1994 ◽  
Author(s):  
Menno P. Zwetsloot ◽  
Elliott R. Sampson
Keyword(s):  
Thermal Spray ◽  
Plasma Spray ◽  
Nickel Aluminum ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Arc Spray ◽  
Spray System ◽  
Technological Advances ◽  
Attachment Device ◽  
Plasma Sprayed

Technological advances in arc spray have produced an arc spray system that competes very favorably with other thermal spray processes. In the past arc spray was thought of as a process for very large parts that need thick buildups. However, an attachment device has been developed which focuses the pattern and accelerates the particles and is known as the Arc Jet system. The advantages of this device were discussed by Zwetloot, Sampson and Thorpe (1993), Reference 4. This attachment device coupled with the introduction of metal cored wires that provide the same chemistries as plasma sprayed powders, provides application engineers with a viable economic alternative to existing spray methods. A comparative evaluation of a standard production plasma spray system was conducted with the arc spray process utilizing the device mentioned above. This evaluation was conducted by an airline company on four major parts coated with nickel aluminum and results show that, for those applications, the arc spray process demonstrated significant benefit. It is expected that other applications may benefit from the use of the arc spray process as well.

In-Flight Particle Characteristics of Plasma-Sprayed Dense Yttria Stabilized Zirconia

1998 ◽  
Author(s):  
L. Leblanc ◽  
C. Moreau
Keyword(s):  
Monitoring System ◽  
Particle Temperature ◽  
Deposition Efficiency ◽  
The State ◽  
Spray Parameters ◽  
Zirconia Powder ◽  
Integrated Optical ◽  
Coating Characteristics ◽  
Coating Microstructure ◽  
Plasma Sprayed

Abstract The influence of input spray parameters on the state of plasma-sprayed zirconia powder is studied. The particle temperature, velocity and diameter are measured using an integrated optical monitoring system. The monitoring system allows the investigation of the particles behavior in the spray jet. The collected information is correlated to coating characteristics such as deposition efficiency, microstructure and thermal diffusivity. Results show that, by monitoring the state of sprayed particles, a better understanding of the coating microstructure and properties can be achieved.

scholarly journals Plasma Spraying and Characterization of Tungsten Carbide-Cobalt Coatings by the Water-Stabilized System WSP

2009 ◽  
Vol 2009 ◽  
pp. 1-11 ◽  
Author(s):  
Pavel Ctibor ◽  
Micheala Kašparová ◽  
Jeremy Bellin ◽  
Emmanuel Le Guen ◽  
František Zahálka
Keyword(s):  
Tungsten Carbide ◽  
Cross Sections ◽  
Mechanical Tests ◽  
Influence Of Spray Parameters ◽  
Spray Parameters ◽  
Wear Performance ◽  
Plasma Sprayed ◽  
Steel Substrates

Tungsten carbide-cobalt powders (WC-17wt% Co) were plasma sprayed by a water-stabilized system WSP. Experiments with variable feeding distances and spray distances were carried out. Thinner coatings were deposited on carbon steel substrates and thicker coatings on stainless steel substrates to compare different cooling conditions. Basic characterization of coatings was done by XRD, SEM, and light microscopy plus image analysis. Microhardness was measured on polished cross-sections. The main focus of investigation was resistance against wear in dry as well as wet conditions. The appropriate tests were performed with set-ups based on ASTM G65 and G75, respectively. The influence of spray parameters onto coating wear performance was observed. The results of mechanical tests were discussed in connection with changes of phase composition and with the quality of the coating's microstructure. The results show that for obtaining the best possible WC-17Co coating with WSP process, from the viewpoint of wear resistance, the desired parameters combination is long feeding distance combined with short spray distance.

Investigation of the Long-Term Stability of Plasma Spraying by Monitoring Characteristics of the Sprayed Particles

1997 ◽  
Author(s):  
L. Leblanc ◽  
P. Gougeon ◽  
C. Moreau
Keyword(s):  
Plasma Spraying ◽  
Particle State ◽  
Electrode Wear ◽  
Spray Parameters ◽  
Long Term Stability ◽  
Long Term Experiment ◽  
On Line ◽  
Coating Microstructure ◽  
Plasma Sprayed

Abstract In plasma spraying temperature and velocity of the sprayed particles are among the most important parameters influencing the microstructure and properties of the deposited coatings. However, the sprayed particle state is influenced by uncontrollable parameters such as the wear state of the electrodes. In order to investigate the influence of the electrode wear state on sprayed particles, a long-term experiment was conducted during which on-line measurements of plasma sprayed yttria-zirconia powder were performed. Results show that even though input parameters were kept constant during the experiment the state of the sprayed particle changed significantly and coatings prepared at different spraying times have different microstructures and can have different properties. However, by changing some input spray parameters it was possible to retrieve the initial sprayed particle state and coating microstructure.

Stellite Superalloy Powder Deposition on 7075 Aluminum Alloy

2019 ◽  
Author(s):  
L. C. Casteletti ◽  
A. Lombardi Neto ◽  
D. T. de Macedo ◽  
L. B. Cruvinel ◽  
George Totten
Keyword(s):  
Aluminum Alloy ◽  
Thermal Spray ◽  
Material Properties ◽  
Base Material ◽  
7075 Aluminum Alloy ◽  
Wear Performance ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Hvof Thermal Spray ◽  
Hvof Thermal Spray Process

Several types of powders can be deposited on metal alloys for property improvement using thermal spray processes. Aircraft grade 7075 aluminum alloy possesses good mechanical properties but poor wear and corrosion resistance. Thermal spray coatings can improve the poor wear performance of 7075 so that it is suitable for use in severe conditions by depositing a hard, wear-resisting layer over the base material. This can be done by a simple production process while maintaining the base material properties. Among the available coatings, cobalt-base superalloys, such as Stellites, provides excellent protection against corrosion and wear. However, the treatment must not deteriorate the substrate hardness. In the High Velocity Oxygen Fuel (HVOF) thermal spray process, the short resident time of the powder in the flame results in a relatively small temperature increase, which in turn results in a lower substrate temperature during the coating deposition. In the present work, HVOF thermal spray process was used to coat 7075-T3 aluminum alloy samples with Stellite 6 superalloy. This treatment resulted in layers of high hardness and improved wear performance while keeping the base material properties unchanged.

scholarly journals A Review on Plasma Sprayed Al-SiC Composite Coatings

2013 ◽  
Vol 1 (1) ◽  
pp. 15-22
Author(s):  
S Tailor ◽  
◽  
RM Mohanty ◽  
PR Soni ◽  
◽  
...  
Keyword(s):  
Thermal Spray ◽  
Composite Coatings ◽  
Ceramic Coatings ◽  
Thermal Barrier ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Reinforced Composite ◽  
Study Results ◽  
Plasma Sprayed

This review is done essentially to study results in the field of synthesis and characterization of SiC reinforced Al-SiC composite coatings using thermal spray process. SiC reinforced composite coatings produced by thermal spray process are being developed for a wide variety of applications, e.g. aerospace, automotive, structural and industrial. It is anticipated that, if properly deposited, Al-ceramic coatings could also provide improved properties like wear resistance and thermal barrier coatings. These results clearly demonstrate that the significant improvement in coating performance can be achieved by utilizing proper thermal spray conditions and SiC % in composite coatings. This paper presents a critical review on SiC reinforced Al-SiC composite coatings using thermal spray by various researchers in past years. The researcher’s findings with necessary parameters for achieve good Al-SiC composite coatings are given.

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