Adhesion measurements for tungsten dust deposited on tungsten surfaces

被引：22

作者：

Riva, G. ^{[1
]}

Tolias, P. ^{[2
]}

Ratynskaia, S. ^{[2
]}

Daminelli, G. ^{[1
]}

Donde, R. ^{[1
]}

De Angeli, M. ^{[3
]}

Vassallo, E. ^{[3
]}

Pedroni, M. ^{[3
]}

机构：

[1] CNR, Inst Condensed Matter Chem & Energy Technol, Via Cozzi 53, I-20125 Milan, Italy

[2] KTH Royal Inst Technol, Space & Plasma Phys, Teknikringen 31, S-10044 Stockholm, Sweden

[3] CNR, Ist Fis Plasma, Via Cozzi 53, I-20125 Milan, Italy

来源：

NUCLEAR MATERIALS AND ENERGY | 2017年 / 12卷

关键词：

PARTICLE ADHESION; FORCES; ROUGHNESS; CONTACT; STRESS; ENERGY;

D O I：

10.1016/j.nme.2016.11.009

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：

The first experimental determination of the pull-off force for tungsten dust adhered to tungsten surfaces is reported. Dust deposition is conducted with gas dynamics methods in a manner that mimics sticking as it occurs in the tokamak environment. Adhesion measurements are carried out with the electrostatic detachment method. The adhesion strength is systematically characterized for spherical micron dust of different sizes and planar surfaces of varying roughness. The experimental pull-off force is nearly two orders of magnitude smaller than the predictions of contact mechanics models, but in strong agreement with the Van der Waals formula. A theoretical interpretation is provided that invokes the effects of nanometer-scale surface roughness for stiff materials such as tungsten. (C) 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

引用

页码：593 / 598

页数：6

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