Hydrogen permeation properties of plasma-sprayed tungsten

R. A. Anderl; R. J. Pawelko; M. R. Hankins; G. R. Longhurst; R. A. Neiser

doi:10.1016/0022-3115(94)91061-8

Hydrogen permeation properties of plasma-sprayed tungsten

R. A. Anderl
, R. J. Pawelko
, M. R. Hankins
, G. R. Longhurst
, R. A. Neiser

Nuclear Science & Technology

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

Tungsten has been proposed as a plasma-facing component material for advanced fusion facilities. This paper reports on laboratory-scale studies that were done to assess the hydrogen permeation properties of plasma-sprayed tungsten for such applications. The work entailed deuterium permeation measurements for plasma-sprayed (PS) tungsten coatings, sputter-deposited (SP) tungsten coatings, and steel substrate material using a mass-analyzed, 3 keV D₃⁺ ion beam with fluxes of ∼6.5 × 10¹⁹ D/m² s. Extensive characterization analyses for the plasma-sprayed tungsten coatings were made using Auger spectrometry and scanning electron microscopy (SEM). Observed permeation rates through composite PS-tungsten/steel specimens were several orders of magnitude below the permeation levels observed for SP-tungsten/steel composite specimens and pure steel specimens. Characterization analyses indicated that the plasma-sprayed tungsten coating had a nonhomogeneous microstructure that consisted of splats with columnar solidification, partially-melted particles with grain boundaries, and void regions. Reduced permeation levels can be attributed to the complex microstructure and a substantial surface-connected porosity.

Original language	English
Pages (from-to)	1416-1420
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	212-215
Issue number	PART B
DOIs	https://doi.org/10.1016/0022-3115(94)91061-8
State	Published - Sep 1994

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title = "Hydrogen permeation properties of plasma-sprayed tungsten",

abstract = "Tungsten has been proposed as a plasma-facing component material for advanced fusion facilities. This paper reports on laboratory-scale studies that were done to assess the hydrogen permeation properties of plasma-sprayed tungsten for such applications. The work entailed deuterium permeation measurements for plasma-sprayed (PS) tungsten coatings, sputter-deposited (SP) tungsten coatings, and steel substrate material using a mass-analyzed, 3 keV D3+ ion beam with fluxes of ∼6.5 × 1019 D/m2 s. Extensive characterization analyses for the plasma-sprayed tungsten coatings were made using Auger spectrometry and scanning electron microscopy (SEM). Observed permeation rates through composite PS-tungsten/steel specimens were several orders of magnitude below the permeation levels observed for SP-tungsten/steel composite specimens and pure steel specimens. Characterization analyses indicated that the plasma-sprayed tungsten coating had a nonhomogeneous microstructure that consisted of splats with columnar solidification, partially-melted particles with grain boundaries, and void regions. Reduced permeation levels can be attributed to the complex microstructure and a substantial surface-connected porosity.",

author = "Anderl, \{R. A.\} and Pawelko, \{R. J.\} and Hankins, \{M. R.\} and Longhurst, \{G. R.\} and Neiser, \{R. A.\}",

note = "Funding Information: Tungsten is a candidate material for high heat flux, plasma-facing components (PFCs) in advanced fusion facilities like the International Thermonuclear Experimental Reactor (ITER) [I]. Plasma-sprayed (PSI tungsten is proposed for such applications because it can be used to prepare coatings on substrates, and it provides the possibility for in situ repair of PFC coatings that have experienced erosion losses due to plasma disruptions. Recently, Neiser et al. [2] have evaluated PS tungsten for fusion-reactor applications. That evaluation presented measurements of the density, thermal conductivity and elastic constants for low pressure, plasma-sprayed deposits of tungsten. It also included the results of experiments that measured the reaction * Work supported by US Department of Energy, Office of Energy Research under DOE Idaho field Office, Contract no. DE-AC07-76ID01570.",

year = "1994",

month = sep,

doi = "10.1016/0022-3115(94)91061-8",

language = "English",

volume = "212-215",

pages = "1416--1420",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

number = "PART B",

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TY - JOUR

T1 - Hydrogen permeation properties of plasma-sprayed tungsten

AU - Anderl, R. A.

AU - Pawelko, R. J.

AU - Hankins, M. R.

AU - Longhurst, G. R.

AU - Neiser, R. A.

N1 - Funding Information: Tungsten is a candidate material for high heat flux, plasma-facing components (PFCs) in advanced fusion facilities like the International Thermonuclear Experimental Reactor (ITER) [I]. Plasma-sprayed (PSI tungsten is proposed for such applications because it can be used to prepare coatings on substrates, and it provides the possibility for in situ repair of PFC coatings that have experienced erosion losses due to plasma disruptions. Recently, Neiser et al. [2] have evaluated PS tungsten for fusion-reactor applications. That evaluation presented measurements of the density, thermal conductivity and elastic constants for low pressure, plasma-sprayed deposits of tungsten. It also included the results of experiments that measured the reaction * Work supported by US Department of Energy, Office of Energy Research under DOE Idaho field Office, Contract no. DE-AC07-76ID01570.

PY - 1994/9

Y1 - 1994/9

N2 - Tungsten has been proposed as a plasma-facing component material for advanced fusion facilities. This paper reports on laboratory-scale studies that were done to assess the hydrogen permeation properties of plasma-sprayed tungsten for such applications. The work entailed deuterium permeation measurements for plasma-sprayed (PS) tungsten coatings, sputter-deposited (SP) tungsten coatings, and steel substrate material using a mass-analyzed, 3 keV D3+ ion beam with fluxes of ∼6.5 × 1019 D/m2 s. Extensive characterization analyses for the plasma-sprayed tungsten coatings were made using Auger spectrometry and scanning electron microscopy (SEM). Observed permeation rates through composite PS-tungsten/steel specimens were several orders of magnitude below the permeation levels observed for SP-tungsten/steel composite specimens and pure steel specimens. Characterization analyses indicated that the plasma-sprayed tungsten coating had a nonhomogeneous microstructure that consisted of splats with columnar solidification, partially-melted particles with grain boundaries, and void regions. Reduced permeation levels can be attributed to the complex microstructure and a substantial surface-connected porosity.

AB - Tungsten has been proposed as a plasma-facing component material for advanced fusion facilities. This paper reports on laboratory-scale studies that were done to assess the hydrogen permeation properties of plasma-sprayed tungsten for such applications. The work entailed deuterium permeation measurements for plasma-sprayed (PS) tungsten coatings, sputter-deposited (SP) tungsten coatings, and steel substrate material using a mass-analyzed, 3 keV D3+ ion beam with fluxes of ∼6.5 × 1019 D/m2 s. Extensive characterization analyses for the plasma-sprayed tungsten coatings were made using Auger spectrometry and scanning electron microscopy (SEM). Observed permeation rates through composite PS-tungsten/steel specimens were several orders of magnitude below the permeation levels observed for SP-tungsten/steel composite specimens and pure steel specimens. Characterization analyses indicated that the plasma-sprayed tungsten coating had a nonhomogeneous microstructure that consisted of splats with columnar solidification, partially-melted particles with grain boundaries, and void regions. Reduced permeation levels can be attributed to the complex microstructure and a substantial surface-connected porosity.

UR - https://www.scopus.com/pages/publications/0028496277

U2 - 10.1016/0022-3115(94)91061-8

DO - 10.1016/0022-3115(94)91061-8

M3 - Article

AN - SCOPUS:0028496277

SN - 0022-3115

VL - 212-215

SP - 1416

EP - 1420

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - PART B

ER -

Hydrogen permeation properties of plasma-sprayed tungsten

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