GAS DYNAMIC COLD SPRAYING: A REVIEW ON MATERIALS, PARAMETERS, APPLICATIONS AND CHALLENGES

2021 ◽  
Vol 16 (2) ◽  
pp. 43
Author(s):  
KUMAR SANTOSH ◽  
KUMAR RAKESH ◽  
◽  
Keyword(s):  
Cold Spraying ◽  
Gas Dynamic

Effects of WC12Co Content on Wear Behavior of NiCoCrAlY Coating by Cold Gas Dynamic Spraying

2014 ◽  
Vol 1004-1005 ◽  
pp. 747-750
Author(s):  
Sheng Qiang Feng ◽  
Cun Long Wang ◽  
Bing Ma ◽  
Lang Cui
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Dry Friction ◽  
Wear Behavior ◽  
Cold Spraying ◽  
Friction Condition ◽  
High Density ◽  
Cold Gas Dynamic Spraying ◽  
Gas Dynamic ◽  
Cold Gas

The NiCoCrAlY+WC12Co coating with high density was prepared on the surface of the magnesium alloy by cold spraying. Effects of the WC12Co content on the wear behavior of coating were studied. The results showed that, under the dry friction condition, the weightlessness of wear of the coating with 20%WC12Co was smallest. The weightlessness of wear of the coating with 10%WC12Co was worse than that with 20%WC12Co. However, the weightlessness of wear of the coating without any WC12Co was worst among the three coatings. After the frictional experiment for 20 minutes, the weightlessness of wear of coating without any WC12Co was 10mg. Compared with that of coatings with 10%WC12Co and 20%WC12Co, the weightlessness of wear was lower than 35% and 54%, respectively. Obviously, the coating with 20%WC12Co had the capacity of the weightlessness of wear resistance. Consequently, the more the coating with WC12Co was, the higher the capacity of the weightlessness of wear resistance was.

scholarly journals A comparative review on cold gas dynamic spraying processes and technologies

2019 ◽  
Vol 6 ◽  
pp. 25 ◽  
Author(s):  
Sunday Temitope Oyinbo ◽  
Tien-Chien Jen
Keyword(s):  
New Technology ◽  
Cold Spraying ◽  
Industrial Applications ◽  
Cold Gas Dynamic Spraying ◽  
Future Research ◽  
Gas Dynamic ◽  
Comparative Review ◽  
Wide Range ◽  
High Fatigue ◽  
Cold Gas

Cold gas dynamic spraying (CGDS) is a relatively new technology of cold spraying techniques that uses converging-diverging (De Laval) nozzle at a supersonic velocity to accelerate different solid powders towards a substrate where it plastically deforms on the substrate. This deformation results in adhesion to the surface. Several materials with viable deposition capability have been processed through cold spraying, including metals, ceramics, composite materials, and polymers, thereby creating a wide range of opportunities towards harnessing various properties. CGDS is one of the innovative cold spraying processes with fast-growing scientific interests and industrial applications in the field of aerospace, automotive and biotechnology, over the past years. Cold gas spraying with a wide range of materials offers corrosion protection and results in increases in mechanical durability and wear resistance. It creates components with different thermal and electrical conductivities than that substrates would yield, or produces coatings on the substrate components as thermal insulators and high fatigue-strength coatings, and for clearance control, restoration and repairing, or prostheses with improved wear, and produces components with attractive appearances. This review extensively exploits the latest developments in the experimental analysis of CGDS processes. Cold gas dynamic spraying system, coating formation and deposit development, description of process parameter and principles, are summarized. Industrial applications and prospectives of CGDS in future research are also commented.

A Review of the Cold Gas Dynamic Spraying Process

2021 ◽  
pp. 135-149
Author(s):  
Sudesna Roy ◽  
Subhrasmita Tripathy
Keyword(s):  
Cold Spraying ◽  
Cold Gas Dynamic Spraying ◽  
Bonding Mechanism ◽  
State Process ◽  
Gas Dynamic ◽  
Material Systems ◽  
Coating Method ◽  
Modern Era ◽  
Spraying Process ◽  
Cold Gas

In this modern era, use of coatings on engineering materials has become highly inevitable. One such emerging coating method is the cold gas dynamic spraying. It is a solid-state process where deposition on to the surface of the material is done at high pressure and velocity. Adhesion of the powder to the substrate is possible because of the high amount of plastic deformation. This chapter introduces the CGDS system and discusses the types of set-ups and its modifications that are generally used. Further, the chapter delves into the process parameters in the spraying process and the correlation of these parameters with the coating properties. It also provides a comprehensive review of the current theories of bonding mechanism in cold spray. It aims to provide an overview of the material systems that have been investigated so far for cold spraying with an outline of the experimental and numerical simulation that have been researched.

Effects of Gas Property on Quality of NiCoCrAlY Coating by Cold Gas Dynamic Spraying

2013 ◽  
Vol 815 ◽  
pp. 682-686 ◽  
Author(s):  
Sheng Qiang Feng ◽  
Bing Ma ◽  
Xiu Ling Wang ◽  
Guo Ping Ling
Keyword(s):  
Oxygen Content ◽  
Great Influence ◽  
Cold Spraying ◽  
Cold Gas Dynamic Spraying ◽  
Gas Temperature ◽  
Coating Quality ◽  
Process Gas ◽  
Gas Dynamic ◽  
Cold Gas

Known from the gas dynamic model of cold spraying, the properties of process gas including gas temperature, gas pressure and gas source have great influence on the critical velocity of powder. The influences of the three kinds of gas properties on the quality of the NiCoCrAlY coating on the magnesium substrate by the experiments of the cold gas dynamic spraying were discussed in this study. The results of the experiments show that, when the pressure value of process gas is 3.5MPa, the density of the coating is perfect, and there are obvious layered structures. The porosity is only 0.45%. The influence of gas temperature on the coating quality is the influence of that on the oxygen content. When the temperature of the process gas is confined to 600°C~700°C, the oxygen content is low and the coating comprehensive quality is best. On the premise that other parameters are kept constant, when nitrogen and helium gas are used together, the coating quality is better.

scholarly journals The Problem of Copper Softening During Cold Gas Dynamic Spraying

Coatings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 7
Author(s):  
Eugeniy Gershman ◽  
Iosif Gershman ◽  
Alexander Mironov ◽  
Pavel Peretyagin
Keyword(s):  
Copper Substrate ◽  
Cold Drawing ◽  
Cold Spraying ◽  
Mechanical Tests ◽  
Cold Gas Dynamic Spraying ◽  
Electron Backscattered Diffraction ◽  
Creep Tests ◽  
Contact Wire ◽  
Gas Dynamic ◽  
Ebsd Method

The effect of the gas-dynamic (cold) spraying of the Cu-Al2O3-Zn powder mixture on the microstructure and strength of the copper substrate is investigated. A copper cold drawn contact wire was used as a substrate. We propose using gas-dynamic cold spraying to restore the local wear of the contact wire. The study of the microstructure using the electron backscattered diffraction (EBSD) method showed the presence of grain orientation characteristics of the cold drawing of copper. Recrystallization of the surface layers of the contact wire during spraying does not occur. Using the microhardness measurement, the absence of softening of the layers of the contact wire with a depth of up to 2 mm is shown. The results of mechanical tests show that spraying does not lead to a decrease in the tensile strength of the contact wire. The results of creep tests show that spraying does not lead to a decrease in the heat resistance of the contact wire.

Effects of Standoff Distance and Particle Size on Quality of NiCoCrAlY Coating by Cold Spraying

2014 ◽  
Vol 513-517 ◽  
pp. 265-268
Author(s):  
Sheng Qiang Feng ◽  
Bing Ma ◽  
Xiu Ling Wang ◽  
Guang Liu ◽  
Zi Yun Zheng ◽  
...  
Keyword(s):  
Particle Size ◽  
Dynamic Property ◽  
Great Influence ◽  
Cold Spraying ◽  
Standoff Distance ◽  
Cold Gas Dynamic Spraying ◽  
Coating Quality ◽  
Gas Dynamic ◽  
Two Parameters

According to the gas dynamic property of cold spraying, the distance from the outside of nozzle to the substrate has great influence on the coating quality including the thickness of coating and the deposition effeciency. Meanwhile, the effects of particle size on coating quality are of the utmost importance. The influences of two parameters above on the quality of the NiCoCrAlY coating on the magnesium substrate by the experiments of the cold gas dynamic spraying were discussed in this study. The results of the experiments showed that, based on the fact that other parameters were not changed, when the standoff distance was more than 50mm, there were no complete coatings on the surface of the substrate, and its thickness was asymmetrical. When the standoff distance was 25mm, the thickness was homogeneous, and the oxygen content was only 1.3%. Also, when the particle size was 5~50μm, the coating quality was better.

scholarly journals КЕРУВАННЯ ЕФЕКТИВНІСТЮ ПРОЦЕСУ ХОЛОДНОГО НАПИЛЮВАННЯ ЗАХИСНО-ВІДНОВЛЮВАЛЬНИХ ПОКРИТТІВ НА МАГНІЄВІ СПЛАВИ

2018 ◽  
pp. 66-73
Author(s):  
Александр Владимирович Шоринов ◽  
Сергей Евгеньевич Маркович
Keyword(s):  
Powder Mixture ◽  
Total Pressure ◽  
Cold Spraying ◽  
Deposition Efficiency ◽  
Cold Gas Dynamic Spraying ◽  
Stagnation Temperature ◽  
Working Pressure ◽  
Local Flow ◽  
Gas Dynamic ◽  
Cold Gas

The crucial task of developing the technology of low pressure cold gas–dynamic spraying and its wide application in the aviation, automotive and other industries is the possibility of obtaining coatings with given properties and deposition efficiency as great as practicable. To do this requires it is necessary to study the effect of complex parameters on coating deposition.An important characteristic of cold gas–dynamic spraying is deposition efficiency – the ratio of weight increment of the sample (weight of the coating) to the weight of powder used to produce the coating. Dependence of the deposition efficiency on the parameters of cold spraying, such as gas stagnation temperature and total pressure, material, shape and size of the powder particles, stand–of–distance, etc., allows a deeper understanding of the nature of the cold gas–dynamic spraying process, and as a consequence, to establish how these parameters effect on coating properties.The effect of stagnation temperature, total pressure and stand–of–distance on the cold spraying coating deposition efficiency on magnesium alloy utilized powder mixture based on aluminum was established. As a result of the deposition efficiency calculation, the optimal sputtering parameters ensuring the maximum deposition efficiency were established. It is shown that changing of the stagnation temperature has the greatest effect on the efficiency of coating formation. Stand–of–distance is the second most influential parameter, and the change in working pressure has the least effect. It is shown that with increasing temperature, the particle velocities increase during the deposition process, since the local speed of sound in the nozzle depends on the local flow temperature.The obtained results are the basis for the development of technological recommendations and processes for the formation of protective and restorative coatings on aeronautical part made of magnesium alloys during maintenance, repair and overhaul. Further optimization of the geometry of the nozzle, the composition of the powder mixture and the particle size is necessary to obtain deposition efficiency as great as practicable.

Morphology, Structure and Catalytic Properties of Pd-CeO2/Al2O3 Catalysts for Methane Oxidation and Coats Based Thereon

2019 ◽  
Vol 19 (3) ◽  
pp. 206-218
Author(s):  
N. V. Shikina ◽  
O. Yu. Pod’yacheva ◽  
A. V. Ishchenko ◽  
S. R. Khairulin ◽  
T. B. Tkachenko ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Cold Spraying ◽  
Scaling Up ◽  
Metal Foil ◽  
Active Components ◽  
Alumina Layer ◽  
Energy Devices ◽  
Metal Foils ◽  
Oxidation Of Methane ◽  
Gas Dynamic

Morphologies and structures of catalytic compositions and coats based thereon were studied using Pd-CeO2/Al2O3 calcined at 100, 500, 1000 °C and the coats prepared by gas dynamic cold spraying onto a metal foil. It was established that the methods for preparation of the initial catalytic composition and for introduction of the active components to the coat influenced the phase composition, particle size and activity to oxidation of methane. The introduction of the active components by impregnation of the pre-deposited alumina layer was shown to provide the uniform distribution of Pd and Ce through the support profile, formation of nanosize PdO particles and of the interacting phases between the catalyst and support components. The impregnated catalyst was most active to oxidation of methane. The method for preparation of the coats has no limitations in scaling-up and, therefore, can be widely used for production of full-size catalysts on metal foils to be used for various energy devices.

Biocompatibility of Cold Sprayed Silver-Doped Hydroxyapatite/Titanium Coatings

2016 ◽  
Vol 848 ◽  
pp. 19-22
Author(s):  
Noppakun Sanpo ◽  
Jirasak Tharajak
Keyword(s):  
Cold Spraying ◽  
Cold Gas Dynamic Spraying ◽  
Human Osteoblast ◽  
Gas Temperature ◽  
Composite Powders ◽  
Low Concentration ◽  
Gas Dynamic ◽  
Spraying Parameters ◽  
Helium Gas ◽  
Titanium Coatings

The deposition using cold gas dynamic spraying of silver-doped hydroxyapatite (HA-Ag) /Titanium (Ti) composite have been fabricated on Al 6061 substrate. The biocompatibility of the obtained HA-Ag/Ti coatings was studied. The ratios of HA-Ag to Ti in their composite powders were 20:80, 50:50 and 80:20 (weight %). The HA-Ag/Ti coatings were successfully deposited using cold spraying parameters of 13-15 bars under helium gas, temperature of between 300-400°C. The biocompatibility results showed that human osteoblast and RAW cells spread and adhered well on the coating surfaces especially at low concentration of HA-Ag contained.

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