Particle Bonding Mechanism in Cold Gas Dynamic Spray: A Three-Dimensional Approach

Zhu, Lin; Jen, Tien‐Chien; Pan, Yen-Ting; Chen, Hongsheng

doi:10.1007/s11666-017-0652-4

Cited by 35 publications

(25 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, researchers on the CS method have reported detailed results for this from several additional experiments and fluid dynamics simulations. 56), 57) The maximum temperature increase and maximum impact pressure during particle impact were found from simulations using the finite element method (FEM) based on the Johnson-Holmquist state equations using the particle impact velocities measured experimentally in this way. At the typical particle impact velocity (normal direction to the substrate) that occurs in RTIC as found by experiments on ¡-Al 2 O 3 microparticles of 300 m/s, the maximum temperature increase did not exceed 500°C, and the maximum impact pressure was 3 GPa, as shown in Figs.…”

Section: Densification Mechanismsmentioning

confidence: 99%

Room temperature impact consolidation and application to ceramic coatings: aerosol deposition method

Akedo

2020

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

Coating processes that purely use collision pressure or impact force such as the aerosol deposition (AD) method and cold spray method have been attracting attention. These methods accelerate microparticles and ultrafine particles into a beam at velocities of several hundreds of m/s or more that impacts a substrate, thus forming dense films with good adhesion forces by only providing purely mechanical energy. It is thought that microparticles of metals and ceramics can thus be macroscopically bonded at room temperature while remaining in a virtually solid state. In fact, the AD method has been commercialized as an important coating process in the field of semiconductor fabrication equipment which has been confirmed to be able to form thin or thick dense films of ceramics with microcrystal structures on the scale of several tens of nm or less at room temperature that offer excellent electromechanical properties. This is called room temperature impact consolidation (RTIC), and is thought to have different principles of film growth from thermal spray coating and shock compaction techniques which obtain bonding by putting the raw material particles into a molten or semi-molten state. This paper describes the deposition mechanism of AD processes that use RTIC and the importance of this as a coating technique for the future.

show abstract

Section: Densification Mechanismsmentioning

confidence: 99%

Room temperature impact consolidation and application to ceramic coatings: aerosol deposition method

Akedo

2020

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

show abstract

“…At the bonding interface, it can be depicted that continuity in the material structure is observed suggesting a mechanical anchoring of the deposit within the imperfect surface structure of the substrate [12,39]. This deposit/substrate mechanical accommodation was perfect for combining polymer particle and metallic substrate [50,51], metallic/ceramic [48], and metallic/polymer [12,38,47,52]. In the case of polymer/ metal combination, complete adhesion can be achieved when the deposition is heat treated.…”

Section: Mechanism Of Coating Formation Processmentioning

confidence: 92%

“…The behaviour of the mechanical structure of a particle/substrate during the impact determines the deposit cohesiveness. Presently, two consolidated natures have been predicted and this depends on whether or not the powders deformed plastically on the substrate [52]. The metallic bonding is achieved through ductile deformation while at the interfacial zone during deposition, the plastic deformation yields high impact.…”

Section: Mechanism Of Coating Deposit Developmentmentioning

confidence: 99%

A comparative review on cold gas dynamic spraying processes and technologies

Oyinbo

Jen

2019

Manufacturing Rev.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The Johnson-Cook plasticity model was used to determine the effects of strain hardening, strain rate hardening and thermal softening on the equivalent plastic deformation resistance. This model has been widely used to simulate the jetting phenomenon of particle impact during cold spraying [12,14,18,27,34,[57][58][59][60][61][62][63][64][65][66][67][68], despite its limitation at very high strain rates [57,69,70]. The equivalent plastic stress of the material is given as follows:…”

Section: Finite Element Modellingmentioning

confidence: 99%

Influence of Particle Velocity When Propelled Using N2 or N2-He Mixed Gas on the Properties of Cold-Sprayed Ti6Al4V Coatings

et al. 2018

View full text Add to dashboard Cite

Cold-spraying is a relatively new low-temperature coating technology which produces coatings by the deposition of metallic micro-particles at supersonic speed onto target substrate surfaces. This technology has the potential to enhance or restore damaged parts made of light metal alloys, such as Ti6Al4V (Ti64). Particle deposition velocity is one of the most crucial parameters for achieving high-quality coatings because it is the main driving force for particle bonding and coating formation. In this work, studies were conducted on the evolution of the properties of cold-sprayed Ti64 coatings deposited on Ti64 substrates with particle velocities ranging from 730 to 855 m/s using pure N2 and N2-He mixture as the propellant gases. It was observed that the increase in particle velocity significantly reduced the porosity level from about 11 to 1.6% due to greater densification. The coatings’ hardness was also improved with increased particle velocity due to the intensified grain refinement within the particles. Interestingly, despite the significant differences in the coating porosities, all the coatings deposited within the velocity range (below and above critical velocity) achieved a high adhesion strength exceeding 60 MPa. The fractography also showed changes in the degree of dimple fractures on the particles across the deposition velocities. Finite element modelling was carried out to understand the deformation behaviour of the impacting particles and the evolutions of strain and temperature in the formed coatings during the spraying process. This work also showed that the N2-He gas mixture was a cost-effective propellant gas (up to 3-times cheaper than pure He) to deliver the high-quality Ti64 coatings.

show abstract

Particle Bonding Mechanism in Cold Gas Dynamic Spray: A Three-Dimensional Approach

Cited by 35 publications

References 21 publications

Room temperature impact consolidation and application to ceramic coatings: aerosol deposition method

Room temperature impact consolidation and application to ceramic coatings: aerosol deposition method

A comparative review on cold gas dynamic spraying processes and technologies

Influence of Particle Velocity When Propelled Using N2 or N2-He Mixed Gas on the Properties of Cold-Sprayed Ti6Al4V Coatings

Contact Info

Product

Resources

About