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Alumina/alumina ceramic matrix composites as part of the SHEFEX II thermal protection system

Mechnich, Peter and Schmücker, Martin (2010) Alumina/alumina ceramic matrix composites as part of the SHEFEX II thermal protection system. CIMTEC, 12th International Ceramics Congress, 7.-11. Juni 2010, Montecatini Terme, Italien.

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For DLR’s SHEFEX II (Sharp Edge Flight Experiment) campaign multiple TPS panels were fabricated from WHIPOX-type alumina/alumina ceramic matrix composites. These CMCs exhibit favourable properties such as high-temperature oxidation resistance and damage tolerance. A special feature of these CMCs is their inherent transparency for electromagnetic waves, making them attractive as thermal protection for antenna. Scheduled for autumn 2010 SHEFEX II will include an actively controlled atmosphere re-entry at a maximum cruise velocity of Mach 11 where a high thermal load on the TPS protected nose-cap is expected. However, emittance of alumina is low and consequently radiation cooling capability of alumina-based TPS panels is limited. In order to prevent thermal overload, emittance of CMCs is improved by superficial impregnation and coating with an oxidation-resistant “black” CoFe-spinel. Thermal performance and material stability was proofed in an arc-heated wind-tunnel at DLR. It turns out that CoFe-spinel surface modification can reduce CMC temperatures by more than 200 K in a Mach 6 hypersonic flow field. The modified CMC exhibits microstructural stability up to the expected TPS peak temperature of 1300°C. Design, manufacturing and set-up of the WHIPOX-TPS segments of SHEFEX II are presented.

Item URL in elib:https://elib.dlr.de/65175/
Document Type:Conference or Workshop Item (Speech)
Title:Alumina/alumina ceramic matrix composites as part of the SHEFEX II thermal protection system
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Thermalschutz, Faserverbundkeramik
Event Title:CIMTEC, 12th International Ceramics Congress
Event Location:Montecatini Terme, Italien
Event Type:international Conference
Event Dates:7.-11. Juni 2010
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):W - Vorhaben SHEFEX (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional Ceramics
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:06 Sep 2010 16:32
Last Modified:06 Sep 2010 16:32

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