The impact of thermal fatigue and carbidization on the W coatings deposited on CFC tiles for the ITER-like Wall project at JET

被引：15

作者：

Ruset, C. ^{[1
]}

Grigore, E. ^{[1
]}

Falie, D. ^{[1
]}

Gherendi, M. ^{[1
]}

Maier, H. ^{[2
]}

Rasinski, M. ^{[3
]}

Matthews, G. F. ^{[4
]}

Zoita, V. ^{[1
,5
]}

机构：

[1] Euratom MEdC Assoc Romania, Natl Inst Laser Plasma & Radiat Phys, Bucharest, Romania

[2] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany

[3] Warsaw Univ Technol, Fac Mat Sci & Engn, Warsaw, Poland

[4] EURATOM, Culham Ctr Fus Energy, Abingdon, Oxon, England

[5] Culham Sci Ctr, EFDA Close Support Unit, Abingdon OX14 3DB, Oxon, England

来源：

FUSION ENGINEERING AND DESIGN | 2013年 / 88卷 / 9-10期

基金：

英国工程与自然科学研究理事会;

关键词：

Tungsten coating; Carbon fiber composite (CFC); ITER-like wall; High heat flux tests; Carbidization;

D O I：

10.1016/j.fusengdes.2013.02.017

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：

Since August 2011 JET operates with the ITER-like wall comprising bulk Be tiles, bulk W tiles and W coated CFC tiles with a thickness of 10-15 p.m and 20-25 p.m. In order to evaluate behavior of the W coatings to a cyclic thermal loading relevant to JET operation, high heat flux (HHF) tests have been carried out up to 5100 pulses with an electron beam facility at peak temperatures of 1000 C, 1250 degrees C and 1450 degrees C. The pulse duration was 24s. Optical inspections of the W layer performed periodically by interrupting the test revealed small delaminations with the size of 50-500 mu m. The dependence of the delamination percentage on the number of pulses can be seen as a degradation curve for each particular W coating. In this way the thermo-mechanical properties of the W coatings can be characterized quantitatively. Thermal fatigue and carbidization of the tungsten due to the diffusion of the carbon from the substrate have been recognized as mechanisms for degradation of the coatings. Tungsten carbides have been identified by using TEM (transmission electron microscopy) diffraction analysis on FIB (focused ion beam) prepared cross-section samples subjected to HHF tests. Nano-pores developed at the CFC-Mo and Mo-W interfaces during the tests might be also responsible for the degradation of the coating. (C) 2013 EURATOM. Published by Elsevier B.V. All rights reserved.

引用

页码：1690 / 1693

页数：4

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