Thermal and chemical stability of the β-W2N nitride phase

被引：18

作者：

Mateus, R. ^{[1
]}

Sequeira, M. C. ^{[1
]}

Porosnicu, C. ^{[2
]}

Lungu, C. P. ^{[2
]}

Hakola, A. ^{[3
]}

Alves, E. ^{[1
]}

机构：

[1] Univ Lisbon, Inst Super Tecn, Inst Plasmas & Fusao Nucl, Ave Rovisco Pais, P-1049001 Lisbon, Portugal

[2] Natl Inst Lasers Plasma & Radiat Phys, Bucharest 077125, Romania

[3] VTT Tech Res Ctr Finland Ltd, Espoo, Finland

来源：

NUCLEAR MATERIALS AND ENERGY | 2017年 / 12卷

关键词：

Beryllium; Tungsten; Nitride; Thermal stability; PLASMA-FACING SURFACES; LAYERS; JET;

D O I：

10.1016/j.nme.2017.03.040

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Pure Be, W and Be: W mixed coatings with nominal compositions of (5:5) and (1:9) were deposited on silicon plates and implanted at room temperature with 30 keV N+ ions with fluences up to 5e17 ions/cm(2). Ion beam and X-ray diffraction analysis evidenced the formation of the alpha-Be3N2 and beta-W2N nitrides. The identified tungsten nitride phase evolves from a BCC W lattice to a BCC W(N) solid solution after irradiating at a fluence of 1e17 N+/cm(2) and to the compact FCC beta-W2N structure at 5e17 N+ /cm(2). Thermal stability of beta-W2N was investigated by annealing the coatings for 1 h up to 1073 K. The results point to the release of non-bonded nitrogen solute in beta-W2N over the annealing range and to the thermal stability of the nitride phase up to 1073 K. (C) 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

引用

页码：462 / 467

页数：6

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