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Mo- and W-Fiber Reinforced SiCN Ceramic Matrix Composites: First Results

Frieß, Martin and Mainzer, Bernd and Koch, Dietmar and Lin, Chaorong and Riedel, Ralf and Riesch, Johann and Feichtmayer, Alexander and Almanstötter, Jürgen (2018) Mo- and W-Fiber Reinforced SiCN Ceramic Matrix Composites: First Results. 5th Workshop on tungsten fibre-reinforced tungsten composites (Wf/W), October 9-11, 2018, Garching. (Unpublished)

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Ceramic matrix composites usually utilize carbon or ceramic fibers as reinforcements. However, such fibers often expose a low ductility during failure. In this work, we follow the idea of a reinforcement concept of a ceramic matrix by refractory metal fibers to reach pseudo ductile behavior during failure. Tungsten and molybdenum fibers were chosen as reinforcement in SiCN ceramic matrix composites manufactured by polymer infiltration and pyrolysis process. The composites were investigated with respect to microstructure, flexural- and tensile strength. The single fiber strengths for both tungsten and molybdenum were investigated and compared to the strength of the composites. Tensile strengths of 206 and 156 MPa as well as bending strengths of 427 and 312 were achieved for W/SiCN and Mo/SiCN composites, respectively. The W fiber became brittle across the entire cross section, while the Mo fiber showed a superficial, brittle reaction zone but kept ductile on the inside.

Item URL in elib:https://elib.dlr.de/125565/
Document Type:Conference or Workshop Item (Speech)
Title:Mo- and W-Fiber Reinforced SiCN Ceramic Matrix Composites: First Results
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Koch, DietmarUNSPECIFIEDhttps://orcid.org/0000-0003-4504-8721
Riedel, RalfTU DarmstadtUNSPECIFIED
Riesch, JohannMPI GarchingUNSPECIFIED
Feichtmayer, AlexanderMPI GarchingUNSPECIFIED
Almanstötter, JürgenOsramUNSPECIFIED
Date:9 October 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Tungsten Molybdenum metal fiber reinforced ceramics SiCN PIP polysilazane CMC
Event Title:5th Workshop on tungsten fibre-reinforced tungsten composites (Wf/W)
Event Location:Garching
Event Type:Workshop
Event Dates:October 9-11, 2018
Organizer:MPI Garching
HGF - Research field:Energy
HGF - Program:Energy Efficiency, Materials and Resources
HGF - Program Themes:Methods and Concepts for Materials Development
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Energy Technologies (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Friess, Dr.rer.nat. Martin
Deposited On:05 Jan 2019 12:58
Last Modified:31 Jul 2019 20:23

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