JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 69

Interfacial analysis of SiC/Cu and W/Cu strength τd, defined as the maximum shear stress encountered at the fibre/matrix interface just prior to the onset of debonding. Fig. 4: Schematic load vs. displacement diagram for push-out and pull-out tests. The research conducted at the Max Planck Institute for Plasma Physics (IPP) in Garching and Greifswald investigates the physics basis of a fusion power plant. Such a plant is designed to generate energy like the sun does, from fusion of atomic hydrogen nuclei: deuterium and tritium. With approximately 1,100 employees, IPP is one of the largest fusion research centres in Europe. The Max Planck Institute for Plasma Physics is associated with the European Fusion Programme and the Helmholtz Association of German Research Centres. More information The mechanical interface properties can be described by the interfacial shear strength τd and can be calculated from single fibre push-out or pull-out tests. The interfacial shear strength for SiC/Cu system was calculated to be 6 MPa for samples without titanium carbide interlayer, and 70 MPa for samples with titanium carbide interlayer [14], [15]. As shn in Figure 5a, no reaction of the outer carbon-rich layer of the SiC fibre with the copper matrix has been observed. This layer acts rather like a lubricant, so that the fibres can be easily pushed out by frictionless slide. The SEM image of such a slipped fibre shows no matrix material at the fibre surface and no deformation of the copper matrix. The composites with a titanium carbide interlayer as a coupling agent exhibit completely different features: the values for interfacial shear strength and interfacial friction stress are at least 10-fold higher compared to the samples without a titanium carbide interlayer, indicating a high bonding strength between SiC fibre and copper matrix. Thus, titanium acted both chemically and mechanically to improve the bonding process. The SEM image in Figure 5b shows a pushedout fibre of a composite specimen with a TiC interlayer: the 3-µm-thick carbon-rich double fibre coating is visible in the centre of the picture. In front of this, the titanium carbide layer and the copper matrix can be recognized. The carbon-rich double layer now remains attached to the matrix after the pushout test, in contrast to the case without TiC layer. Thus, via the TiC layer, the copper matrix is perfectly bonded to the whole SCS6-SiC fibre (comprising all their constituents), and the fibre core region itself moves longitudinally during the push-out tests by shear and displacement processes, which enable a controlled energy-dissipative behaviour. The debonding processes are then governed by the thin healing layer of pure amorphous carbon between the SiC core and the outer carbon-rich double layer. Fig. 5: SEM images of SiC/Cu with its failure zone: a) pushed fibre from a composite without titanium interlayer, b) pushed fibre from a composite with titanium carbide interlayer. The interfacial shear strength of the W/Cu system was calculated to be 26 MPa for samples without interlayer, 69 MPa for samples with a thin PVD deposited Cu interlayer and 21 MPa for samples with graded transition between W fibre and Cu matrix. Interdiffusion and segregation of W and Cu can be excluded, thus, mechanically bonding is governed. The SEM image (Figure 6a) shows electroplated Cu matrix residues in the coarse grooves of W fibre surface after the pull-out test of the No33 June 2007 / JEC Composites Magazine

JEC COMPOSITES MAGAZINE - Issue #33 - June 2007

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #33 - June 2007

Editorial
Market Place
Advertisers & Index
Contents
NEWS WORLDWIDE
- Companies
- Agenda of events
- Innovations
BUSINESS
- Market survey
- Trends
- Niche markets
- Human capital
FEATURE - CONSTRUCTION
- Process
- Equipment
- Application
USERS’ PLATFORM
- Composites in the world
- Applications
KNOW-HOW
- Stretch-broken fibres
- Metal matrix
- Durability
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 1
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 2
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - Editorial
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - Market Place
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - Advertisers & Index
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - Contents
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 7
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Companies
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 9
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 10
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 11
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Agenda of events
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 13
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Innovations
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 15
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 16
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 17
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 18
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 19
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 20
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 21
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 22
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - BUSINESS
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Market survey
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 25
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 26
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Trends
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 28
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Niche markets
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Human capital
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - FEATURE - CONSTRUCTION
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Process
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 33
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Equipment
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 35
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 36
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Application
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 38
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 39
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 40
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 41
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 42
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 43
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 44
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 45
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 46
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 47
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 48
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 49
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 50
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 51
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 52
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 53
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 54
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - USERS’ PLATFORM
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Composites in the world
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 57
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Applications
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 59
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 60
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 61
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 62
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - KNOW-HOW
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Stretch-broken fibres
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 65
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 66
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Metal matrix
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 68
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 69
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 70
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - - Durability
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 72
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 73
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 74
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 75
JEC COMPOSITES MAGAZINE - Issue #33 - June 2007 - 76
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