Cold spraying of light alloys

Li, W.; Liao, Hanlin; Wang, H.

doi:10.1533/9781845699451.2.242

Cited by 8 publications

(4 citation statements)

References 70 publications

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“…For a review of successfully cold-sprayed and studied material systems and applications see e.g. [20,[171][172][173][174]. Figure 26 shows a few examples of coldsprayed coatings, as investigated by the authors and co-workers at Helmut Schmidt University.…”

Section: Materials and Applicationsmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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Cold spraying is a solid-state powder deposition process with several unique characteristics, allowing production of coatings or bulk components from a wide range of materials. The process has attracted much attention from academia and industry over the past two decades.The technical interest in cold spraying is twofold: first as a coating process for applications in surface technology, and second as a solid-state additive manufacturing process, offering an alternative to selective laser melting or electron beam melting methods. Moreover, cold spraying can be used to study materials behaviour under extremely high strain rates, high pressures and high cooling rates. The cold spraying process is thus considered to be relevant for various industrial applications, as well as for fundamental studies in materials science.This article aims to provide an overview of the cold spray process, the current understanding of the deposition mechanisms, and the related models and experiments, from a materials science perspective. IntroductionCold spraying (CS) is a solid-state material deposition technique, where micron-sized particles of a powder bond to a substrate as a result of high-velocity impact and the associated severe plastic deformation. Acceleration of particles to high velocities is obtained via expansion of a pressurised and (ironically) 'hot' gas through a diverging-converging nozzle.Despite heating the process gas -which is to provide higher acceleration of the gas and also to facilitate particle deformation through thermal softening -the feedstock remains in the solid state throughout the entire process; hence the name 'cold' spraying. This is to underline the contrast to conventional thermal spraying where particles are completely or partially molten upon impact onto the substrate. Alternative terminology includes cold gas spray, micro cold spray, cold gas dynamic spray, kinetic spray, supersonic particle deposition and metal powder application (MPA), all of which refer to the same principle of solid-state powder deposition as described above. CS is used for coating and repair. It is also used for additive manufacturing (AM) at relatively high deposition rates as compared to the methods based on selective laser or electron beam melting. The main advantage of CS is that it alleviates the problems associated with high temperature processing of materials, such as oxidation and unfavourable structural changes. It is possibly the only continuous method to produce bulk components of metastable materials that are available only in the powder form, e.g. as obtained from mechanical attrition or gas atomisation. The aim of the present paper is to provide an overview of CS from a materials perspective, particularly for a broader audience in materials research, e.g. with interest in dynamic phenomena, plasticity and phase transformations. In terms of application and properties, CS is perhaps best to be compared to thermal spraying processes, as in [24,25]. In view of relevant physical phenomena, however, CS is mos...

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Section: Materials and Applicationsmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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“…A patent on CS nickel-graphite abradable coating has been granted, 290 and it is promising to expand to coatings with other materials such as Al-12Si alloy, Al-bronze, Ni-Cr-Al alloys and their composites with polymer or graphite additions. 280…”

Section: Protective Coatingsmentioning

confidence: 99%

“…In contrast to the relatively porous and oxidized thermal sprayed protective coatings, such as Zn, Al and their alloys, CS coatings have higher resistance to corrosive media and longer service life. The key problem for these CS protective coatings is to develop industrial equipment and techniques to economically and easily deposit coatings on large and complex surfaces 280. (2)High-temperature oxidation resistant coatings.…”

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confidence: 99%

A Review of Advanced Composite and Nanostructured Coatings by Solid-State Cold Spraying Process

Assadi

Gaertner

et al. 2018

Critical Reviews in Solid State and Materials Sciences

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Cold spraying (CS) has been widely explored over the last decade due to its low process temperature and limited thermal effect on spray materials. As a solid-state process, the inherent deficiencies of traditional thermal spraying such as oxidation, decomposition and grain growth are avoided. This article summarizes the research work on the fabrication of composites and nanostructured coatings by the promising CS process. After a brief introduction to CS and its deposition mechanisms, the preparation methods of spray powders are classified. Different methods are appropriate for particles of various properties, and the tendency is to design composite powders by combined methods in order to create coatings with specified properties. Then the co-deposition mechanism of composite particles as well as research findings on metal-metal, metal-ceramic and metal-intermetallic composite coatings are reviewed concerning the deposition characteristics, microstructure and its relation to properties. Moreover, CS has been used to deposit a variety of nanostructured materials, including metals, metal-ceramic composites, and even ceramics, retaining their nanocrystalline nature in the coating without grain growth or phase transformation. Finally, the potential applications of CS and issues to be addressed in coating deposition are discussed.

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“…Cold Spraying (CS) shows great potential in fabricating composite materials [1]. Its low-temperature deposition process can effectively protect the sprayed material from oxidation, decomposition, phase transformation and/or grain growth and even deleterious chemical reactions between the matrix and the reinforcement materials [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Quantitative determination of SiC particles distribution of cold sprayed Al5056/SiC composite coatings

Cao

Liang

et al. 2019

Surface Engineering

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In order to explore an easy way determining the hard particle distribution in the cold sprayed composite coatings. Four Al5056/SiC composite coatings were employed in the present study. One quantitative metallographic analysis method, box-counting (BC) and hardness indentation method, the Weibull distribution were used. The relative deviation value σ and the shape parameter m were used as the quantitative factors for determining the uniformity of the SiC distribution in the coating, respectively. Results show that both methods obtained the same tendency that the uniformity of SiC distribution in the coating following the order of Al5056 + 30vol.-%SiC> +15vol.-% SiC> +45vol.-%SiC> +60vol.-%SiC. Results suggest that the increase of the SiC content could worsen the SiC uniformity in the composite coatings. However, there is still an optimised SiC content for uniform distribution, as for the 30vol.-% for the present case. The hardness Weibull distribution is more simple and feasible than the BC method.

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Cold spraying of light alloys

Cited by 8 publications

References 70 publications

Cold spraying – A materials perspective

Cold spraying – A materials perspective

A Review of Advanced Composite and Nanostructured Coatings by Solid-State Cold Spraying Process

Quantitative determination of SiC particles distribution of cold sprayed Al5056/SiC composite coatings

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