Correlation between Al2O3 particles and interface of Al–Al2O3 coatings by cold spray

Lee, Ha Yong; Jung, Se Hun; Lee, Soo Yong; You, Young Ho; Ko, Kyung‐Seok

doi:10.1016/j.apsusc.2005.03.148

Cited by 110 publications

(41 citation statements)

References 15 publications

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“…The chosen temperatures and pressures for aluminium low-pressure cold spraying are well within the range given in literature: 0.6 MPa and 573 K [23], 0.5 MPa and temperature from 300 to 900 K, through form 800 K very high porosity was observed in the aluminum coatings [24], 0.7 MPa and 603 K [25]. Table 3 provides stereometric properties of coatings as single beads made after single passage of spraying gun for each trial.…”

Section: Resultsmentioning

confidence: 94%

Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

Winnicki¹,

Piwowarczyk²,

Małachowska³

et al. 2014

Archives of Metallurgy and Materials

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The paper deals with effect of working gas pressure and temperature on surface stereometry of coatings deposited by low-pressure cold spray method. Examinations were focused on aluminium coatings which are commonly used to protect substrate against corrosion. A commercial Al spherical feedstock powder with admixture of Al 2 O 3 (Al + 60wt.-% Al 2 O 3 ), granulation -50+10 µm, was used to coat steel, grade S235JR. The deposited coatings were studied to determine their stereometry, i.e. roughness, transverse and longitudinal waviness, topography of surface and thickness as the functions of gas pressure and temperature. A profilometer and focal microscope were used to evaluate the stereometric properties. In order to reduce the number of variables, the remaining process parameters, i.e. shape and size of de Laval nozzle, nozzle-to-substrate distance, powder mass flow rate, linear velocity of spraying gun, were kept unchanged. The investigation confirmed influence of temperature and pressure on coating thickness as well as on the surface seterometry.Keywords: Cold Spray, metal-matrix composite, roughness, waviness W artykule przedstawiono wpływ ciśnienia i temperatury gazu roboczego na sterometrię powierzchni powłok nakładanych za pomocą niskociśnieniowej metody natryskiwania na zimno. Powłoki na podłożu stalowym S235JR zostały wykonane przy użyciu komercyjnie dostępnego proszku Al z dodatkiem Al 2 O 3 (20% Al/80% Al 2 O 3 wagowo) o granulacji <50 µm, zostały wykonane powłoki na podłożu stalowym S235JR. Następnie za pomocą profilometru i mikroskopu konfokalnego określono właściwości stereometryczne powłok takie jak chropowatość, falistość, topografię powierzchni oraz grubość w funkcji temperatury i ciśnienia gazu roboczego. W celu zminimalizowania ilości zmiennych pozostałe parametry procesu nie były zmieniane. Badania potwierdziły wpływ ciśnienia i temperatury gazu na stereometrię powierzchni.

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Section: Resultsmentioning

confidence: 94%

Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

Winnicki¹,

Piwowarczyk²,

Małachowska³

et al. 2014

Archives of Metallurgy and Materials

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show abstract

“…Different properties of the cold spray cermet coatings such as adhesion, wear resistance, corrosion resistance, and so forth were studied ( Ref 4,7,[9][10][11][12][13]. For example, the addition of Al 2 O 3 to Al powder is reported to enhance the coating-to-substrate adhesion (Ref 7).…”

Section: Introductionmentioning

confidence: 98%

Effect of Ceramic Particle Velocity on Cold Spray Deposition of Metal-Ceramic Coatings

Sova

Косарев

Papyrin³

et al. 2010

J Therm Spray Tech

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In this paper, metal-ceramic coatings are cold sprayed taking into account the spray parameters of both metal and ceramic particles. The effect of the ceramic particle velocity on the process of metal-ceramic coating formation and the coating properties is analyzed. Copper and aluminum powders are used as metal components. Two fractions of aluminum oxide and silicon carbide are sprayed in the tests. The ceramic particle velocity is varied by the particle injection into different zones of the gas flow: the subsonic and supersonic parts of the nozzle and the free jet after the nozzle exit. The experiments demonstrated the importance of the ceramic particle velocity for the stability of the process: Ceramic particles accelerated to a high enough velocity penetrate into the coating, while low-velocity ceramic particles rebound from its surface.

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“…At the present time, this effect is basically explained by the fact that ceramic particles, due to a high-velocity impact, rough, clean, and activate the surface thus enhancing the metal particles fixing to it and, therefore, increasing the deposition coefficient. Along with this, some quantity of ceramic particles remain in the coating ( Ref 6,8).…”

Section: Introductionmentioning

confidence: 99%

Calculation of Particle Parameters for Cold Spraying of Metal-Ceramic Mixtures

et al. 2009

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Formation of metal-ceramic composite coatings by cold spray is one of the major directions in the development and application of the technology. As experiments showed, addition of a hard ceramic component into the mixture can shift the transition from substrate erosion to particles adhesion closer to adhesion. This effect may be induced by ceramic particles which not only erode, but also activate the target surface. Velocity and temperature of particles at their high-velocity impact onto the substrate are governing parameters in particles/substrate interaction. These parameters influence both the process of metal particles deposition and the process of erosion/activation of the substrate surface by ceramic particles. Metallic and ceramic particles collide with each other in the gas stream. These collisions can produce preactivation effect on metal particles by cleaning their surface. The level of activation depends on a typical velocity of collision which is the difference between velocities of metal and ceramic particles. Parameters of metallic and ceramic particles in the gas stream are estimated. Calculations show that components of mixtures with fine abrasive particles have greatly different velocities that influences preactivation of metal particles. At the same time, the substrate surface is activated by fine abrasive particles characterized by a high-impact velocity.

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Correlation between Al2O3 particles and interface of Al–Al2O3 coatings by cold spray

Cited by 110 publications

References 15 publications

Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

Effect of Ceramic Particle Velocity on Cold Spray Deposition of Metal-Ceramic Coatings

Calculation of Particle Parameters for Cold Spraying of Metal-Ceramic Mixtures

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