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Combination of PIP and LSI processes for SiC/SiC ceramic matrix composites

Süß, Fabia and Schneider, Tobias and Friess, Martin and Jemmali, Raouf and Vogel, Felix and Klopsch, Linda and Koch, Dietmar (2021) Combination of PIP and LSI processes for SiC/SiC ceramic matrix composites. DKG Jahrestagung KERAMIK2021, Jülich (virtuell).

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Silicon carbide fiber-reinforced silicon carbide matrix composites (SiC/SiC CMCs) are promising candidates for components in the hot gas section of jet engines, as they exhibit high temperature resistance and low density compared to their metal alloy counterparts. Three common manufacturing routes are chemical vapor infiltration, reactive melt infiltration (RMI) and polymer infiltration and pyrolysis (PIP). This work describes a new approach of a combined PIP and RMI process. A combination of the processes seems attractive: the remaining porosity after PIP process can be closed by subsequent siliconization, resulting in a dense material. SiC/SiC CMCs were manufactured by PIP process using Hi-Nicalon Type S fibers. Generally, the processing of SiC/SiC, produced solely by PIP route, is rather time-consuming and the composites show a certain residual porosity. In order to obtain a dense matrix and to reduce the processing time, an additional RMI with silicon alloy is carried out after a reduced number of PIP cycles. To protect the fibers during the siliconization, a CVD fiber coating was applied. Microstructure was examined via microCT, SEM and EDS. Bending strength was determined to 433 MPa; strain to failure was 0.60%. The overall processing time was reduced by 55% compared to standard PIP route. The hybrid material contained 70% less unreacted carbon than material produced by LSI process alone.

Item URL in elib:https://elib.dlr.de/145565/
Document Type:Conference or Workshop Item (Speech)
Title:Combination of PIP and LSI processes for SiC/SiC ceramic matrix composites
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Süß, FabiaUNSPECIFIEDhttps://orcid.org/0000-0002-5016-5781UNSPECIFIED
Koch, DietmarUNSPECIFIEDhttps://orcid.org/0000-0003-4504-8721UNSPECIFIED
Date:21 April 2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:SiC/SiC, cerami matrix composites, liquid silicon infiltration, PIP
Event Title:DKG Jahrestagung KERAMIK2021
Event Location:Jülich (virtuell)
Event Type:international Conference
Organizer:Deutsche Keramische Gesellschaft
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Structural Materials and Design
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design
Deposited By: Süß, Fabia
Deposited On:15 Nov 2021 09:15
Last Modified:19 Nov 2021 09:55

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