This title appears in the Scientific Report :
2004
Please use the identifier:
http://dx.doi.org/10.1238/Physica.Topical.111a00167 in citations.
Brittle Destruction of Carbon Based Materials
Brittle Destruction of Carbon Based Materials
Erosion mechanisms for different carbon based materials (graphite, carbon fiber composites (CFCs), Si-doped CFC) have been studied under brittle destruction under intense transient thermal loads (ELMs, plasma disruptions, VDEs) with respect to material erosion in different particle emission regimes,...
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Personal Name(s): | Koza, Y. |
---|---|
Amouroux, S. / Bazylev, B. N. / Berthe, E. / Kühnlein, W. / Linke, J. / Penkalla, H.-J. / Singheiser, L. | |
Contributing Institute: |
Werkstoffstruktur und Eigenschaften; IWV-2 Betriebsdirektion - Heisse Zellen; BD-Z |
Published in: | Physica scripta, T111 (2004) S. 167 - 172 |
Imprint: |
Bristol
IoP Publ.
2004
|
Physical Description: |
167 - 172 |
DOI: |
10.1238/Physica.Topical.111a00167 |
Document Type: |
Journal Article |
Research Program: |
Kernfusion und Plasmaforschung |
Series Title: |
Physica Scripta Topical Issue
111 |
Subject (ZB): | |
Publikationsportal JuSER |
Erosion mechanisms for different carbon based materials (graphite, carbon fiber composites (CFCs), Si-doped CFC) have been studied under brittle destruction under intense transient thermal loads (ELMs, plasma disruptions, VDEs) with respect to material erosion in different particle emission regimes, characterization of emitted particles, and behavior of preheated samples. Furthermore, the experimental data were compared with 3-D numerical simulation on the onset of brittle destruction. From a morphological point of view, the resulting erosion patterns on the test samples and ejected particles differ significantly for the three materials. The isotropic graphite shows a homogeneous erosion pro. le with. at craters, while the CFC forms no crater and only preferential erosion in localized spots in the PAN fiber area while the pitch fiber strands remain almost undamaged. The particles originating from graphite samples which have been collected on TEM grids are composed of nano sized amorphous carbon. CFCs have been the source for sub mm sized agglomerated fragments of crystalline carbon or silicon particles with similar to 50 nm diameter. Preheating of the test samples to 500 or 800 degrees C results in a remarkable increase of the erosion depth and weight loss compared to the samples loaded at room temperature and identical heat fluxes. In particular, melting phenomena in the Si-doped CFC materials became essential at elevated temperatures. |