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Featured researches published by S. Sistla.


Physica Scripta | 2017

Development and characterization of powder metallurgically produced discontinuous tungsten fiber reinforced tungsten composites

Y. Mao; J. W. Coenen; J. Riesch; S. Sistla; J. Almanstötter; B. Jasper; A. Terra; T. Höschen; H. Gietl; Martin Bram; Jesús González-Julián; Ch. Linsmeier; Christoph Broeckmann

In future fusion reactors, tungsten is the prime candidate material for the plasma facing components. Nevertheless, tungsten is prone to develop cracks due to its intrinsic brittleness—a major concern under the extreme conditions of fusion environment. To overcome this drawback, tungsten fiber reinforced tungsten (Wf/W) composites are being developed. These composite materials rely on an extrinsic toughing principle, similar to those in ceramic matrix composite, using internal energy dissipation mechanisms, such as crack bridging and fiber pull-out, during crack propagation. This can help Wf/W to facilitate a pseudo-ductile behavior and allows an elevated damage resilience compared to pure W. For pseudo-ductility mechanisms to occur, the interface between the fiber and matrix is crucial. Recent developments in the area of powder-metallurgical Wf/W are presented. Two consolidation methods are compared. Field assisted sintering technology and hot isostatic pressing are chosen to manufacture the Wf/W composites. Initial mechanical tests and microstructural analyses are performed on the Wf/W composites with a 30% fiber volume fraction. The samples produced by both processes can give pseudo-ductile behavior at room temperature.


Composites Part A-applied Science and Manufacturing | 2018

Influence of the interface strength on the mechanical properties of discontinuous tungsten fiber-reinforced tungsten composites produced by field assisted sintering technology

Y. Mao; J. W. Coenen; J. Riesch; S. Sistla; J. Almanstötter; B. Jasper; A. Terra; T. Höschen; H. Gietl; Ch. Linsmeier; Christoph Broeckmann


symposium on fusion technology | 2016

Advanced Materials for a Damage Resilient Divertor Concept for DEMO

J. W. Coenen; J. Riesch; J.-H. You; M. Riethm; G. Pintsuk; H. Gietl; B. Jasper; F. Klein; A. Litnovsky; Y. Mao; A. von Müller; S. Sistla; T. Wegener; Christoph Broeckmann; Ch. Linsmeier; R. Neu


Nuclear Materials Conference | 2018

Development of tungsten fiber-reinforced tungsten composites produced by field assisted sintering technology process

Y. Mao; J. Riesch; H. Gietl; J. W. Coenen; S. Sistla; A. Terra; L. Raumann; Ch. Broeckmann; Ch. Linsmeier; T. Höschen; B. Jasper; J. Almanstötter


Proc. of 19th Plansee Seminar, ed. H. Kestler, L. Sigl | 2017

Tungsten fibre-reinforced tungsten composites

J. W. Coenen; J. Riesch; T. Wegener; H. Gietl; Christian Linsmeier; Y. Mao; S. Sistla; R. Neu; F. Klein; B. Jasper; Martin Bram; Ch. Broeckmann; A. Litnovsky


DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM) | 2017

Development and characterization of tungsten multi-fiber reinforced tungsten composites produced by field assisted sintering technology

Y. Mao; J. W. Coenen; J. Riesch; S. Sistla; B. Jasper; A. Terra; Ch. Linsmeier; Ch. Broeckmann


DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM) | 2017

Development and characterization of field assistant sintering technology produced tungsten multi-fiber reinforced tungsten composites

Y. Mao; J. Riesch; J. W. Coenen; Ch. Linsmeier; A. Terra; Ch. Broeckmann; S. Sistla; B. Jasper


82. Jahrestagung der DPG und DPG-Frühjahrstagung der Sektion AMOP | 2017

Powder metallurgically produced tungsten fiber-reinforced tungsten composites

Y. Mao; J. Riesch; H. Gietl; J. W. Coenen; S. Sistla; A. Terra; Ch. Broeckmann; Jesús González-Julián; Ch. Linsmeier; T. Höschen; B. Jasper; Martin Bram; J. Almanstötter


World PM2016 Congress & Exhibition | 2016

Determination of Material Properties for the Simulation of Field Assisted Sintering of Binderless Tungsten Carbide (WC)

S. Sistla; Karl Marko Hajeck; Anke Kaletsch; Christoph Broeckmann


Archive | 2016

Primary Shaping Processes

Christoph Broeckmann; Christian Hopmann; Georg J. Schmitz; S. Sistla; Marcel Spekowius; Roberto Spina; Chung Van Nguyen

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B. Jasper

Forschungszentrum Jülich

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J. W. Coenen

Forschungszentrum Jülich

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Y. Mao

Forschungszentrum Jülich

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A. Terra

Forschungszentrum Jülich

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Ch. Linsmeier

Forschungszentrum Jülich

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