Bonding formation in vacuum kinetic-sprayed Y2O3 particles induced by high-velocity impact

Kwon, Hansol; Kim, Yeon-Ju; Kim, Jaeick; Seok, Hye-Won; Kim, Daegun; Lee, Changhee

doi:10.1016/j.surfcoat.2020.125866

Cited by 8 publications

(12 citation statements)

References 39 publications

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“…Successful deposition using MCS has been shown to be coincident with one or more of the following phenomena: grain size reduction, an increase in dislocation density, and disordering of the crystal lattice as verified by transmission electron microscopy 8,13–17 . These hallmark microstructural features are consistent across a wide variety of process conditions, including the choice of particle compositions (from soft piezoelectrics to hard technical ceramics), substrate (plastics, metals, and ceramics), particle size (100−500 nm), and impact velocity (100−600 m/s) 3 .…”

Section: Introductionmentioning

confidence: 78%

“…The most common experimental technique for confirming grain size reduction is Scherrer analysis of the x‐ray diffraction (XRD) spectrum of a film, 44 in which the peaks of the spectrum broaden as the grain size decreases, which gives useful information about crystallite size but limited information about amorphization or orientation. Transmission electron microscopy of MCS film cross sections is able to directly observe all three forms of grain size reduction, and in fact, several teams have done so for yttria and other technical ceramics 13–17,8 …”

Section: Discussionmentioning

confidence: 99%

“…Transmission electron microscopy of MCS film cross sections is able to directly observe all three forms of grain size reduction, and in fact, several teams have done so for yttria and other technical ceramics. [13][14][15][16][17]8…”

Section: Size Scaling Behaviorsmentioning

confidence: 99%

See 2 more Smart Citations

A strain density function to analyze particle size effects during high velocity impacts of yttria

Moyers,

Becker,

Kovar

2024

J Am Ceram Soc.

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The impact behavior of a single yttria (Y2O3) nanoparticle onto a Y2O3 substrate is studied as a function of particle velocity (300–1200 m/s) and diameter (12–50 nm) using molecular dynamics simulations. To analyze the results, a strain density function is developed to provide both quantitative and qualitative information about the deformation mechanisms that contribute to the final state of the system. This function provides both clear evidence of shear localization and insight into the conditions for which localization occurs during the impact of Y2O3 particles as they approach experimentally relevant sizes. Further analysis shows that localization and fragmentation only occur for Y2O3 impacts with diameters of at least 50 nm, while particles with diameters of 25 nm and smaller deform primarily by amorphization and viscous flow. Implications for the deposition of films of Y2O3 and other rare‐earth oxides via the micro cold spray process are discussed.

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Section: Introductionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

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A strain density function to analyze particle size effects during high velocity impacts of yttria

Moyers,

Becker,

Kovar

2024

J Am Ceram Soc.

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“…The relevant literature in this context can be classified by the underlying simulation method into CFD simulations, mostly in combination with finite-element methods (FEM) [33,38,39,51,77,[83][84][85][86][87][88][89][90][91][92][93] and molecular dynamics (MD) simulations. [13,[94][95][96][97][98][99][100][101][102] CFD simulations are mainly used to investigate the dynamic behavior of the particles and the carrier gas, and in combination with FEM, the evolution of the field-distributed quantities in impacting particles and the substrate.…”

Section: In Silico Work Investigating the Deposition Mechanism And Pa...mentioning

confidence: 99%

“…The change in particle or impact velocity on the deposition mechanism has been studied in great detail. [51,77,[83][84][85][91][92][93][94]98,[100][101][102] A CFD simulation was performed by Park et al for a one-particle impact of 0.3 μm Al 2 O 3 particles on Al 2 O 3 and glass substrates using the Johnson-Holmquist 2 (JH-2) material model. [85] At low impact velocities, the particles elastically rebound at the substrate without major deformation (Figure 14a,d), while at a velocity of 50 m s À1 for the Al 2 O 3 substrate and 100 m s À1 for the glass substrate, a tensile stress was generated vertically to the impact direction, which induced fragmentation in addition to the elastic rebounding (Figure 14b,e).…”

Section: In Silico Work Investigating the Deposition Mechanism And Pa...mentioning

confidence: 99%

Powder Aerosol Deposition and Polymers: Is There Hope for a Common Future?

Thiel,

Lienkamp

2024

Adv Eng Mater

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Polymer‐Ceramic Composites (PCC) are promising functional materials with a wide range of applications in energy technology, microelectronics and sensor technology, as protective coatings, in wastewater treatment or for biomedical purposes. Unfortunately, ceramics require high‐temperature sintering, while polymers only have a limited thermal stability. Therefore, PCC fabrication is quite complex and requires strict process control. This severely limits the efficiency and economy of the process, and the reproducibility of the desired materials properties. Powder Aerosol Deposition (PAD) is a spray coating process in which ceramic powders are accelerated by a pressure difference using a carrier gas. They are then deposited as nanocrystalline, dense coatings onto different kinds of substrates without the need for additional sintering. Current research focuses on materials obtained from PAD of ceramic powders. Yet there are also examples of mixed polymer and ceramic particles that have been successfully deposited in PAD processes. So far, much of this works does not go beyond the trial‐and‐error stage, so that a general concept for successful deposition of PCCs by PAD is not yet available. This review revisits the fundamentals of the PAD process and its most important process parameters that were studied experimentally and in‐silico. It connects these with recent work on the combination of polymers and ceramics in the PAD process in order to highlight and evaluate the future of this field from a polymer science perspective.This article is protected by copyright. All rights reserved.

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A Self-Consistent Scheme for Understanding Particle Impact and Adhesion in the Aerosol Deposition Process

et al. 2021

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Aerosol deposition (AD) is a thick-film deposition process that can produce films tens to hundreds of micrometers thick with densities greater than 95% of the bulk at room temperature. However, the precise mechanisms of bonding and densification are still under debate. To better understand and predict deposition, a self-consistent approach is employed that combines computational fluid dynamics (CFD), finite element (FE) modeling, and experimental observation of particle impact to improve the understanding of particle flight, impact, and adhesion in the AD process. First, deposition is performed with a trial material to form a film. The process parameters are fed into a CFD model that refines the particle flow and impact velocity for a range of sizes. These values are in turn used to inform the FE parameters to model the fracture and adhesion of the particle on the substrate. The results of FE modeling are compared to SEM images of fractured particles to complete a self-consistent numerical and experimental understanding of the AD process. Additional FE and CFD simulations are used to study how process parameters, materials, and particle parameters affect the deposition process and how the developed tools can be used to optimize deposition efficiency.

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Bonding formation in vacuum kinetic-sprayed Y2O3 particles induced by high-velocity impact

Cited by 8 publications

References 39 publications

A strain density function to analyze particle size effects during high velocity impacts of yttria

A strain density function to analyze particle size effects during high velocity impacts of yttria

Powder Aerosol Deposition and Polymers: Is There Hope for a Common Future?

A Self-Consistent Scheme for Understanding Particle Impact and Adhesion in the Aerosol Deposition Process

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