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C/C–SiC sandwich structures manufactured via liquid silicon infiltration

Published online by Cambridge University Press:  07 July 2017

Bernhard Heidenreich ,
Dietmar Koch ,
Harald Kraft  and
Yves Klett
Bernhard Heidenreich*
Affiliation:
German Aerospace Center (DLR), Institute of Structures and Design, Stuttgart, Germany
Dietmar Koch
Affiliation:
German Aerospace Center (DLR), Institute of Structures and Design, Stuttgart, Germany
Harald Kraft
Affiliation:
German Aerospace Center (DLR), Institute of Structures and Design, Stuttgart, Germany
Yves Klett
Affiliation:
University of Stuttgart, Institute of Aircraft Design, Stuttgart, Germany
*
a)Address all correspondence to this author. e-mail: bernhard.heidenreich@dlr.de
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Abstract

In a new design approach, C/C–SiC sandwich structures have been realized via liquid silicon infiltration and in situ joining methods. In the first process step, the carbon fiber reinforced polymer preforms for the planar skin plates as well as for the core structures were manufactured via warm pressing and autoclave technique, using C fiber fabrics preimpregnated with phenolic resin. Thereby, two types of C/C–SiC core structures were used: foldcore and grid core. In the second process step, the sandwich components were pyrolyzed separately, leading to porous C/C preforms and subsequently joined to a C/C sandwich structure, using an adhesive. In the last process step, the C/C structure was infiltrated with molten Si, and the SiC matrix was built up by a chemical reaction of Si and C, leading to a permanently joined C/C–SiC sandwich structure. For mechanical characterization, sandwich specimens were manufactured and tested in 4 point bending.

Keywords

ceramiccompositeinfiltration (chemical reaction)
Type
Invited Articles
Information
Journal of Materials Research , Volume 32 , Issue 17: Focus Issue: Achieving Superior Ceramics and Coating Properties through Innovative Processing , 14 September 2017 , pp. 3383 - 3393
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Nahum Travitzky

References

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