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Oxidation Kinetics and Its Impact on the Strength of Carbon Short Fiber Reinforced C/SiC Ceramics

Shi, Yuan and Tushtev, Kamen and Hausherr, Jan and Koch, Dietmar and Rezwan, Kurosch (2013) Oxidation Kinetics and Its Impact on the Strength of Carbon Short Fiber Reinforced C/SiC Ceramics. Advanced Engineering Materials, 15 (1-2), pp. 19-26. Wiley. doi: 10.1002/adem.201200130. ISSN 1438-1656.

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Because of the excellent fracture toughness and oxidation resistance, carbon short fiber reinforced ceramics have a sound potential for a variety of high-temperature applications. For the composite's reliable use in long-term applications, however, the oxidation effects on the mechanical strength are of crucial interest and have hitherto not been investigated in detail yet. In this study, the weight change of carbon short fiber reinforced C/SiC composites with carbon fiber lengths of 9 mm (long cut fiber composite – LCFC) and 2 mm (short milled fiber composite – SMFC), respectively, are evaluated in the temperature range from 500 to 1200 °C for two different fiber orientations. Both types of composites were additionally tested in bending mode after 25 and 50 min of exposure to air at 700 °C depending on fiber orientation. After 3 h of exposure at 1000 °C, a total weight loss of up to 37% for LCFC and 47% for SMFC could be determined. The bending test carried out after 50 min exposure at 700 °C showed a dramatic decrease down to 50% of the initial flexural strength for LCFC samples with fibers orientated in parallel to the beam axis. The smallest strength decrease of around 13% was found for SMFC samples with fibers orientated perpendicularly to the beam axis. Microstructural investigations suggest strongly that oxidation along the fibers is the most dominating weakening mechanism and is therefore directly affected by the fiber orientation and length.

Item URL in elib:https://elib.dlr.de/87294/
Document Type:Article
Title:Oxidation Kinetics and Its Impact on the Strength of Carbon Short Fiber Reinforced C/SiC Ceramics
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Shi, YuanUNSPECIFIEDhttps://orcid.org/0000-0002-4210-9069UNSPECIFIED
Tushtev, KamenUniversität BremenUNSPECIFIEDUNSPECIFIED
Hausherr, JanUniversität BayreuthUNSPECIFIEDUNSPECIFIED
Koch, DietmarUNSPECIFIEDhttps://orcid.org/0000-0003-4504-8721UNSPECIFIED
Rezwan, KuroschUniversität BremenUNSPECIFIEDUNSPECIFIED
Date:February 2013
Journal or Publication Title:Advanced Engineering Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 19-26
Series Name:Advanced Engineering Materials
Keywords:oxidation, mechanical performance, short fiber reinforced C/SiC, fiber orientation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Shi, Dr.-Ing. Yuan
Deposited On:14 Jan 2014 15:28
Last Modified:28 Mar 2023 23:41

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