Design of tungsten fiber-reinforced tungsten composites with porous matrix

Mao, Y.; Coenen, J. W.; Sistla, S.; Liu, Chao; Terra, A.; Tan, Xiao–Yue; Riesch, J.; Hoeschen, T.; Wu, Yucheng; Broeckmann, Christoph; Linsmeier, Ch.

doi:10.1016/j.msea.2021.141361

Cited by 26 publications

(19 citation statements)

References 42 publications

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“…[27] Design of tungsten fiber-reinforced tungsten composites with porous matrix 2021 [33] Interlayer properties of tungsten fibre-reinforced composites and their determination by different methods 2021 [34] tensile tests were performed with the same setup which was used for static tensile tests previously [27]. The unidirectional reinforced W f /W specimens with a fibre volume fraction of ∼11% and a matrix density of ∼99% were tested.…”

Section: Tungsten Fibre-reinforced Tungstenmentioning

confidence: 99%

Material and component developments for the DEMO divertor using fibre reinforcement and additive manufacturing

Neu,

Coenen,

Curzadd

et al. 2023

Mater. Res. Express

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Within the research along the European Fusion Roadmap, water-cooled divertor PFCs are foreseen in the design of a first fusion demonstration power plant (DEMO) in order to provide reliable heat removal capability. In the frame of this concerted attempt, the MPI for Plasma Physics is concentrating on the development and testing of composite materials based on tungsten (W, preferred armour material) and copper (Cu, preferred heat sink material). W fibres (Wf) as monofilaments and yarns as reinforcement play a central role in these investigations due to their extraordinary properties concerning ductility already at room temperature and high tensile strength. Recent investigations on the impact of radiation damage suggest that the fibres retain their ductility upon irradiation. W reinforced with W fibres (Wf/W) allows to overcome the intrinsic brittleness of W. Quantitative mechanical fracture tests of Wf /W confirm the basic mechanisms of fibre reinforcement and the increased resistance to mechanical fatigue. The good wettability of W with liquid Cu and the absence of any metallurgical solubility make up an ideal material pairing for composite production. W fibre-reinforced Cu (Wf /Cu) cooling tubes provide a rather high thermal conductivity (> 250 W/mK) and at least twice the strength of CuCrZr in hoop direction in the temperature range up to at least 500 °C. Very recent neutron irradiation experiments confirm the sustainment of ductility of the Wf /Cu composite. Numerical simulations suggest that thermal stresses in W-Cu PFCs could be strongly reduced by tailoring the local W and Cu volume fraction. This ‘freely’ distributed material composition can be achieved by means of additively manufactured W skeletons consecutively infiltrated by Cu. Investigations with W preforms produced by Laser Beam Powder Bed Fusion and infiltrated by Cu demonstrate the feasibility of this approach while testing of specifically prepared specimen is ongoing.

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Section: Tungsten Fibre-reinforced Tungstenmentioning

confidence: 99%

Material and component developments for the DEMO divertor using fibre reinforcement and additive manufacturing

Neu,

Coenen,

Curzadd

et al. 2023

Mater. Res. Express

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“…The weakest point in the component determines the fracture toughness and therefore the material's lifetime is difficult to predict [8][9][10][11]. To mitigate this problem and to improve the toughness and reproducibility of tungsten-based components, tungsten fiber-reinforced tungsten (Wf/W) metal matrix composites are being developed [10,[12][13][14][15][16][17][18][19][20][21][22]. As shown in Figure 1, extrinsic toughening mechanisms like fiber pull-out, ductile deformation and/or crack bridging are applied to promote a pseudo-ductile behavior that significantly increases the application range of Wf/W composites compared to brittle tungsten.…”

Section: Mechanical Properties Of Tungsten and Wf/w Compositesmentioning

confidence: 99%

Bulk Tungsten Fiber-Reinforced Tungsten (WfW) Composites Using Yarn-Based Textile Preforms

Lau¹,

Coenen²,

Schwalenberg³

et al. 2023

Preprint

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The use of tungsten fiber-reinforced tungsten composites (Wf/W) has been demonstrated to significantly enhance the mechanical properties of tungsten (W) by incorporating W-fibers into the W-matrix. However, prior research has been restricted by the usage of single fiber-based textile fabrics, consisting of 150 µm warp and 50 µm weft filaments, with limited homogeneity, reproducibility, and mechanical properties in bulk structures due to the rigidity of the 150 µm fibers. To overcome this limitation, two novel textile preforms were developed utilizing radial braided yarns with 7 core- and 16 sleeve filaments (R.B. 16+7) as the warp material. In this study, bulk composites of two different fabric types were produced via a layer-by-layer CVD-process, utilizing single 50 µm filaments (type 1) and R.B. 16+7 yarns (type 2) as weft materials. The produced composites were sectioned into KLST-type specimen based on DIN EN ISO 179-1:2000 using electrical discharge machining (EDM), and subjected to three-point bending tests. Both composites demonstrated enhanced mechanical properties with pseudo-ductile behavior at room temperature and endured over 10,000 load cycles between 50-90 % of their respective maximum load without sample fracture. Composites based on fabric type 1 demonstrated superior manufacturing performance and mechanical properties, a high relative average density (>97 %), and high fiber volume fraction (14-17 %). Furthermore, a novel approach to predict the fatigue behavior of the material under cyclic loading was developed based on the high reproducibility of the mechanical properties of type 1, providing a new benchmark for upscaling endeavors.

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“…For the use in the present study, the material was produced via powder metallurgical route as described in the study of Mao et al [ 20 ] Three main objectives were followed based on samples produced: upscaling, joining and characterization, and high heat‐flux evaluation. Samples were produced at RWTH as well as Hefei University of Technology, with the latter focussing on the larger‐scale SPS processes, using a large‐scale FAST facility (LABOX‐6020 Sinter Land INC).…”

Section: Tungsten Fiber Reinforces Tungsten W F/w‐status Of Upscaling...mentioning

confidence: 99%

Evolution of Tungsten Fiber‐Reinforced Tungsten‐Remarks on Production and Joining

et al. 2023

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Material issues pose a significant challenge for the design of future fusion reactors. These issues require new advanced materials to be developed. W‐fiber‐reinforced W‐composite material (W f/W) incorporates extrinsic toughening mechanisms increasing the resistance against failure and thus granting steps toward application in a future fusion reactor. W f/W can be produced based on chemical vapor deposition or powder metallurgical routes. In this contribution, the efforts of upscaling the production of W f/W will be reviewed based on recent results. In addition, the activities related to enabling large‐scale production for new fusion applications are being studied. Herein, two main achievements are to be highlighted. First, an upscaled production is established to produce flat tile samples for joining tests on copper and steel, and second, a new method of joining W f/W on copper is established and tested under high heat‐flux conditions.

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Design of tungsten fiber-reinforced tungsten composites with porous matrix

Cited by 26 publications

References 42 publications

Material and component developments for the DEMO divertor using fibre reinforcement and additive manufacturing

Material and component developments for the DEMO divertor using fibre reinforcement and additive manufacturing

Bulk Tungsten Fiber-Reinforced Tungsten (WfW) Composites Using Yarn-Based Textile Preforms

Evolution of Tungsten Fiber‐Reinforced Tungsten‐Remarks on Production and Joining

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