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Development of Damage-Tolerant Ceramic Matrix Composites (SiC/SiC) using Si-BN/SiC/pyC Fiber Coatings and LSI Processing

Mainzer, Bernd and Jemmali, Raouf and Watermeyer, Philipp and Kelm, Klemens and Frieß, Martin and Koch, Dietmar (2017) Development of Damage-Tolerant Ceramic Matrix Composites (SiC/SiC) using Si-BN/SiC/pyC Fiber Coatings and LSI Processing. Journal of Ceramic Science and Technology, 08 (1), pp. 113-120. Göller Verlag. DOI: 10.4416/JCST2016-00095 ISSN 2190-9385

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Silicon-carbide-fiber-reinforced silicon carbide matrix composites (SiC/SiC) exhibit good thermal shock resistance, a low coefficient of thermal expansion and excellent physical properties as well as chemical stability at elevated temperatures and are therefore regarded as promising candidates for various applications in heavily loaded turbine sections of jet engines. Liquid silicon infiltration was chosen as a technique characterized by short processing times to obtain composites with low porosity in a three-step process: infiltration of fiber preforms with a phenolic resin, pyrolysis and siliconization. Unfortunately, uncoated Tyranno SA3 fibers were cramped in the matrix, resulting in SiC/SiC with low strength and damage tolerance. In order to protect the fibers and to simultaneously provide a weak fiber matrix bonding, a CVD Si-BN/SiC/pyC fiber coating was chosen. The triple coating leads to a twofold higher bending strength of SiC/SiC as well as to more damage-tolerant fracture behavior compared to composites without fiber coating. Composites with various fiber volume contents are compared with regard to their mechanical properties. The microstructure of the composites was characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and computed tomography (CT), especially with regard to the functionality of the fiber coating.

Item URL in elib:https://elib.dlr.de/111802/
Document Type:Article
Title:Development of Damage-Tolerant Ceramic Matrix Composites (SiC/SiC) using Si-BN/SiC/pyC Fiber Coatings and LSI Processing
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mainzer, Berndbernd.mainzer (at) dlr.deUNSPECIFIED
Jemmali, Raoufraouf.jemmali (at) dlr.deUNSPECIFIED
Watermeyer, Philippphilipp.watermeyer (at) dlr.deUNSPECIFIED
Kelm, Klemensklemens.kelm (at) dlr.deUNSPECIFIED
Frieß, Martinmartin.friess (at) dlr.deUNSPECIFIED
Koch, Dietmardietmar.koch (at) dlr.deUNSPECIFIED
Journal or Publication Title:Journal of Ceramic Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.4416/JCST2016-00095
Page Range:pp. 113-120
Publisher:Göller Verlag
Keywords:SiC/SiC, liquid silicon infiltration, Tyranno SA3, fiber coating
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Institute of Materials Research
Deposited By: Mainzer, Bernd
Deposited On:21 Sep 2017 10:26
Last Modified:10 Jan 2019 15:55

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