WC-Cu thermal barriers for fusion applications

Dias, M.; Guerreiro, F.; Tejado, E.; Correia, J.B.; Mardolcar, U. V.; Coelho, Marlene de Barros; Palacios, T.; Pastor, J.Y.; Carvalho, Patrícia Almeida; Alves, E.

doi:10.1016/j.surfcoat.2018.02.086

Cited by 20 publications

(11 citation statements)

References 8 publications

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“…It should be expected that the advantages of laser machining of ESD coatings would include the following: The issue of manufacturing new materials based on WC and Cu and the search for their applications is of topical interest [38,39]. In their works, the authors presented WC-Cu sinters made using hot pressing.…”

Section: Introductionmentioning

confidence: 99%

The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining

et al. 2020

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Electro-spark deposition (ESD) and laser beam machining (LBM) are the technologies using the concentrated energy flux. This paper deals with the issue of the impact of laser modification on the morphology and mechanical properties of carbide/copper coatings produced by electro-spark treatment. The coatings were applied to C45 carbon steel samples using the EIL-8A device. The following three types of electrodes made using the powder metallurgy (PM) hot pressing technique, from copper and tungsten carbide powders of different percentage compositions, were used for the coatings: 25% WC and 75% Cu; 50% WC and 50% Cu; and 75% WC and 25% Cu. Laser modification of the surface layers was performed with an Nd:YAG laser. The research focused on the analysis of the morphology of coatings applied by electro-spark technology before and after laser processing. The analysis of the morphology of electro-spark coatings revealed that the coatings had microcracks and pores. The laser beam machining of ESD coatings led to the homogenization of chemical composition, fragmentation of the structure, and elimination of microcracks. In addition, measurements of porosity, microhardness, adhesion, and analysis of XRD phase composition of the electro-spark coatings were performed. Laser processing proved to have a positive effect on improving the adhesion of coatings and reducing their porosity. This paper also presents a simulation model of heat transfer processes for the case of laser radiation impact on a WC-Cu coating. The developed numerical model, describing the influence of laser treatment on the distribution of temperature fields in the heated material (at a given depth) is of significant importance in the development of treatment technologies. Laser-modified ESD coatings perform anti-wear and protective functions, which enable their potential application in means of transport such as rolling stock.

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Section: Introductionmentioning

confidence: 99%

The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining

et al. 2020

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“…Another good case in point is their potential as heat sinks for highly-loaded plasma facing components in nuclear fusion devices owing to their good thermal conductivity and superior mechanical properties at elevated temperatures [ [9], [10], [11]]. WC-Cu composites are also promising candidates for thermal barriers between plasma facing components and copper-based heat sinks [12,13]. Other applications include the warhead and nozzle liners of missiles or rockets which utilize high densities and the unique thermophysical-mechanical properties of the composites [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…In this scenario, the structure of W/WC scaffolds can be eventually inherited by the composites which can play a key role in dictating their final properties. These scaffolds are most commonly processed with powder metallurgy techniques because of the refractory nature of W and WC [ [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15]]. Despite its good applicability, such a method encompasses several shortcomings that may downgrade the performance of resulting composites.…”

Section: Introductionmentioning

confidence: 99%

“…Despite its good applicability, such a method encompasses several shortcomings that may downgrade the performance of resulting composites. Firstly, the scaffolds generally contain a limited fraction of pores, with porosity typically smaller than 50 vol.% [ [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15]], to maintain their integrity during processing. This leads to a low Cu content in the infiltrated composites and accordingly restricts their thermal and electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…This makes the conduits for thermal and electrical transport rather narrow and torturous along any direction in the composites as they are primarily localized in the Cu component. Such an isotropic protocol for processing these materials contrasts sharply with their property requirements which are directional in most practical service conditions [ [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13]]; indeed, this is especially true for thermal and electrical conduction properties which are the major function of W/WC-Cu composites.…”

Section: Introductionmentioning

confidence: 99%

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Ice-templated porous tungsten and tungsten carbide inspired by natural wood

Zhou

Tan

Jiao

et al. 2020

Journal of Materials Science & Technology

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The structures of tungsten and tungsten carbide scaffolds play a key role in determining the properties of their infiltrated composites for multifunctional applications. However, it is challenging to construct and control the architectures by means of self-assembly in W/WC systems because of their large densities. Here we present the development of unidirectionally porous architectures, with high porosities exceeding 65 vol.%, for W and WC scaffolds which in many respects reproduce the design motif of natural wood using a direct ice-templating technique. This was achieved by adjusting the viscosities of suspensions to retard sedimentation during freezing. The processing, structural characteristics and mechanical properties of the resulting scaffolds were investigated with the correlations between them explored. Quantitative relationships were established to describe their strengths based on the mechanics of cellular solids by taking into account both inter-and intra-lamellar pores. The fracture mechanisms were also identified, especially in light of the porosity. This study extends the effectiveness of the ice-templating technique for systems with large densities or particle sizes. It further provides preforms for developing new nature-inspired multifunctional materials, as represented by W/WC-Cu composites.

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Tungsten Carbides

Shabalin

2022

Ultra-High Temperature Materials IV

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WC-Cu thermal barriers for fusion applications

Cited by 20 publications

References 8 publications

The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining

The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining

Ice-templated porous tungsten and tungsten carbide inspired by natural wood

Tungsten Carbides

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