Characterization of thick plasma spray tungsten coating on ferritic/martensitic steel F82H for high heat flux armor

Yahiro, Yoshiteru; Mitsuhara, Masatoshi; Tokunakga, K.; Yoshida, N.; Hirai, T.; Ezato, Koichiro; Suzuki, Satoshi; Akiba, Masato; Nakashima, Hideharu

doi:10.1016/j.jnucmat.2008.12.219

Cited by 60 publications

(27 citation statements)

References 13 publications

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“…Much work has been devoted to investigate suitable coating technologies and plasma spray (PS) in vacuum [2,9], physical vapor deposition (PVD) [10,11], and chemical vapor deposition (CVD) [12] have been proposed and tested under high heat flux loading. Yahiro et al [13] investigated air plasma spray (APS) comparing the characteristics of coatings with those obtained through PS made in vacuum. In general, APS coatings present a higher content of oxygen and oxides, and porosity that worsens the thermo-mechanical properties [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Laser Pulse Effects on Plasma-Sprayed and Bulk Tungsten

Montanari

Pakhomova

Pizzoferrato

et al. 2017

Metals

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Tungsten (W) is considered a promising plasma-facing material for protecting the divertor of the ITER (International Thermonuclear Experimental Reactor). The effects on W of transient thermal loads of high energy occurring in a tokamak under operative conditions have been simulated through a single laser pulse delivered by an Nd:YAG laser. Bulk and plasma-sprayed (PS) samples have been submitted to tests and successively examined via SEM (scanning electron microscopy) observations. In both types of materials, the laser pulse induces similar effects: (i) a crater forms in the spot central area; (ii) all around the area, the ejection and the movement of molten metal give rise to a ridge; (iii) in a more external area, the surface shows plates with jagged boundaries and cracks induced by thermal stresses; (iv) the pores present in the original material become preferred ablation sites. However, the affected surface area in PS samples is larger and asymmetric if compared to that of bulk material. Such a difference has been explained by considering how microstructural characteristics influence heat propagation from the irradiated spot, and it was found that grain size and shape play a decisive role.

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Section: Introductionmentioning

confidence: 99%

Laser Pulse Effects on Plasma-Sprayed and Bulk Tungsten

Montanari

Pakhomova

Pizzoferrato

et al. 2017

Metals

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“…Many experimental investigations have been made to test properties of PFMs under high thermal loads [8][9][10][11][12][13][14][15][16] using different facilities [4][5][6]. On the other hand, theoretical analyses based on the analytical models [17][18][19][20][21] or using finite element methods (FEM) [22][23][24] have also been performed to understand the thermal behavior of PFMs under HHF testing with plasma, electrons and ions recently.…”

Section: Introductionmentioning

confidence: 99%

Theoretical simulation of thermal behavior in transient heat loads testing of plasma-facing materials

Li¹,

Zhou²,

Huang³

et al. 2011

Fusion Engineering and Design

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“…Unfortunately, products of tungsten or its composites with complex shape are difficult to make through conventional industrial methods such as powder metallurgy (PM) and chemical vapor deposition (CVD) due to their ultra-high melting point and high ductile-to-brittle transition temperature (DBTT, approximately 400°C) (Ref [6][7][8]. People have long wished to develop an effective fabrication method to produce W-based products of desired shapes and density.…”

Section: Introductionmentioning

confidence: 99%

Thermal Shock and Ablation Behavior of Tungsten Nozzle Produced by Plasma Spray Forming and Hot Isostatic Pressing

et al. 2015

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Tungsten nozzle was produced by plasma spray forming (PSF, relative density of 86 ± 2%) followed by hot isostatic pressing (HIPing, 97 ± 2%) at 2000°C and 180 MPa for 180 min. Scanning electron microscope, x-ray diffractometer, Archimedes method, Vickers hardness, and tensile tests have been employed to study microstructure, phase composition, density, micro-hardness, and mechanical properties of the parts. Resistance of thermal shock and ablation behavior of W nozzle were investigated by hot-firing test on solid rocket motor (SRM). Comparing with PSF nozzle, less damage was observed for HIPed sample after SRM test. Linear ablation rate of nozzle made by PSF was (0.120 ± 0.048) mm/s, while that after HIPing reduced to (0.0075 ± 0.0025) mm/s. Three types of ablation mechanisms including mechanical erosion, thermophysical erosion, and thermochemical ablation took place during hot-firing test. The order of degree of ablation was nozzle throat > convergence > dilation inside W nozzle.

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Characterization of thick plasma spray tungsten coating on ferritic/martensitic steel F82H for high heat flux armor

Cited by 60 publications

References 13 publications

Laser Pulse Effects on Plasma-Sprayed and Bulk Tungsten

Laser Pulse Effects on Plasma-Sprayed and Bulk Tungsten

Theoretical simulation of thermal behavior in transient heat loads testing of plasma-facing materials

Thermal Shock and Ablation Behavior of Tungsten Nozzle Produced by Plasma Spray Forming and Hot Isostatic Pressing

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