Impact Behavior for Successful Particle–Particle Bonding in Vacuum Kinetic Spraying

Kwon, Hansol; Kim, Yeon-Ju; Park, Hyungkwon; Lee, Changhee

doi:10.1007/s11666-020-01078-7

Cited by 18 publications

(20 citation statements)

References 40 publications

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“…The slightly rougher surface topography for depositing finer powder sizes might be attributed to local differences in bow shock phenomena preferably decelerating smaller particles in front of local valley regimes. In summary, the observations for Aerosol Deposition of Ti 3 SiC 2 correspond well to the impact models by Akedo, Hanft et al or Kwon et al (Ref 19,20,28), postulating heavy deformation and refinement being more prominent close the interface between adhering material and the impacting particle, and immediate or later removement of upper parts by fracture or erosion.…”

Section: Microscopic Deformation Featuressupporting

confidence: 86%

“…Thus, the layer formation of Ti 3 SiC 2 particles in Aerosol Deposition is mainly associated with ceramic-like fracture. However, with about 100 to 500 nm, the size of fragments obtained in single impacts is much larger than refinement sizes of less than 20 nm reported in the literature for successful layer formation by Aerosol Deposition ( Ref 19,28,42). Thus, the single impact morphologies showing the whole particle are probably not representative for the mechanisms associated with dense layer formation.…”

Section: Microscopic Deformation Featuresmentioning

confidence: 71%

“…For Aerosol Deposition of ceramics in general, several models are discussed to explain bonding. By experiments and modelling, most established descriptions associate bonding and layer formation in Aerosol Deposition with (dynamic) particle fragmentation into nanocrystalline microstructures (Ref 19,20,28). Another approach was followed by Daneshian et al by using molecular dynamic (MD) simulations (Ref 40,41).…”

Section: Discussionmentioning

confidence: 99%

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Aerosol Deposition of Ti3SiC2-MAX-Phase Coatings

2021

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For the present study on Aerosol Deposition of MAX-phase materials, Ti3SiC2 was chosen as model system due to the availability of property data and commercial powder. The as-received powder was milled to different nominal sizes. For revealing details on coating formation and possible bonding mechanisms, Aerosol Deposition experiments were performed for different particle size batches and process gas pressures. Microstructural analyses reveal that coating formation preferably occurs for particle sizes smaller two microns. Using such small particle sizes, crack-free, dense layers can be obtained. The individual deposition efficiencies for the different particle sizes, particularly the critical size below which deposition gets prominent, vary with process gas flows and associated pressures. Detailed microstructural analyses of coatings by high-resolution scanning electron microscopy reveal plastic deformation and fracture, both attributing to shape adaption to previous spray layers and probably bonding. In correlation to coating thickness or deposition efficiencies, respective results give indications for possible bonding mechanisms and a tentative window of Aerosol Deposition for Ti3SiC2 MAX-phases as spray material.

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Section: Microscopic Deformation Featuressupporting

confidence: 86%

Section: Microscopic Deformation Featuresmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

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Aerosol Deposition of Ti3SiC2-MAX-Phase Coatings

2021

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“…In theory and practice, spray methods of small-sized powder have to deal with the interaction between the particles and gas flow needed for acceleration (Ref [20][21][22][23][24]. However, since about micron-or even submicron-size powder follow the gas flow like finest dust in such aerosols, possible diversion in front of the substrate also has to be considered (Ref [22][23][24].…”

Section: Prerequisites and Bonding Mechanisms For Successful Coating mentioning

confidence: 99%

Kinetic Spraying of Brittle Materials: From Layer Formation to Applications in Aerosol Deposition and Cold Gas Spraying

2021

J Therm Spray Tech

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This special issue of the Journal of Thermal Spray Technology focuses on kinetic spraying processes of mainly brittle materials. The definition of ''kinetic spraying'' involves the impact of materials in the solid state as expressed by technical terms as ''aerosol deposition'' (AD), ''vacuum kinetic spray,'' ''granule spray in vacuum,'' as well as ''cold gas spraying.'' Applying kinetic spraying to brittle materials covers the deposition of ceramics and 123

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“…Certain critical minimum and maximum sizes can be deduced from experiments (Ref 14 -16). Whereas the lower limit can be attributed to (i) the fluid dynamics of fine particles and deceleration by the bow shock in front of the substrate (Ref 14) and (ii) needed grain refinement in AD ( Ref 17,18), reasons for the definition of the upper limit are not yet clear. Concerning the former point for minimum sizes (i), fluid dynamic simulations confirmed that very fine particles do not reach to the substrate by changing their flight direction along with the gas flow in front of the substrate ( Ref 14).…”

Section: Introductionmentioning

confidence: 99%

Size Effects of Brittle Particles in Aerosol Deposition—Molecular Dynamics Simulation

et al. 2021

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Up to now, the role of particle sizes on the impact behavior of ceramic particles in aerosol deposition not yet fully understood. Hence, with the aim to supply a more general understanding, modeling series of low strain rate compression and high-speed impact were performed by molecular dynamics on single-crystalline particles in sizes of 10-300 nm that are tuned to match mechanical properties of TiO2-anatase. The modeling results reveal that particles with original diameter of 25-75 nm exhibit three different impact behaviors that could be distinguished as (i) rebounding, (ii) bonding and (iii) fragmentation, depending on their initial impact velocity. In contrast, particles larger than 75 nm do not exhibit the bonding behavior. Detailed stress and strain field distributions reveal that combination of “localized inelastic deformation” along the slip systems and “shear localization” cause bonding of the small and large particles to the substrate. The analyses of associated temperature rise by the inelastic deformation revealed that heat diffusion at these small scales depend on size. Whereas small particles could reach a rather homogeneous temperature distribution, the evolved heat in the larger ones keeps rather localized to areas of highest deformation and may support deformation and the formation of dense layers in aerosol deposition.

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Impact Behavior for Successful Particle–Particle Bonding in Vacuum Kinetic Spraying

Cited by 18 publications

References 40 publications

Aerosol Deposition of Ti3SiC2-MAX-Phase Coatings

Aerosol Deposition of Ti3SiC2-MAX-Phase Coatings

Kinetic Spraying of Brittle Materials: From Layer Formation to Applications in Aerosol Deposition and Cold Gas Spraying

Size Effects of Brittle Particles in Aerosol Deposition—Molecular Dynamics Simulation

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