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Thermostructural Properties Of Sic/Sic Panels With 2.5d And 3d Fiber ArchitecturesCMC hot-section components in advanced engines for power and propulsion will typically require high cracking strength, high ultimate strength and strain, high creep- rupture resistance, and high thermal conductivity in all directions. In the past, NASA has demonstrated fabrication of a variety of SiC/SiC flat panels and round tubes with various 2D fiber architectures using the high-modulus high-performance Sylramic-iBN Sic fiber and Sic-based matrices derived by CVI, MI, and/or PIP processes. The thermo- mechanical properties of these CMC have shown state-of-the-art performance, but primarily in the in-plane directions. Currently NASA is extending the thermostructural capability of these SiC/SiC systems in the thru-thickness direction by using various 2.5D and 3D fiber architectures. NASA is also using specially designed fabrication steps to optimize the properties of the BN-based interphase and Sic-based matrices. In this study, Sylramic-iBN/SiC panels with 2D plain weave, 2.5D satin weave, 2.5D ply-to-ply interlock weave, and 3D angle interlock fiber architectures, all woven at AITI, were fabricated using matrix densification routes previously established between NASA and GEPSC for CVI-MI processes and between NASA and Starfire-Systems for PIP processes. Introduction of the 2.5 D fiber architecture along with an improved matrix process was found to increase inter-laminar tensile strength from 1.5 -2 to 3 - 4 ksi and thru-thickness thermal conductivity from 15-20 to 30-35 BTU/ft.hr.F with minimal reduction in in-plane strength and creep-rupture properties. Such improvements should reduce thermal stresses and increase the thermostructural operating envelope for SiC/SiC engine components. These results are analyzed to offer general guidelines for selecting fiber architectures and constituent processes for high-performance SiC/SiC engine components.
Document ID
20050203664
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Yun, H. M.
(NASA Glenn Research Center Cleveland, OH, United States)
DeCarlo, J. A.
(NASA Glenn Research Center Cleveland, OH, United States)
Bhatt, R. H.
(NASA Glenn Research Center Cleveland, OH, United States)
Jaskowiak, M. H.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Composite Materials
Meeting Information
Meeting: 29th Annual Conference on Composites, Materials, and Structures
Location: Cocoa Beach, FL
Country: United States
Start Date: January 24, 2005
End Date: January 28, 2005
Sponsors: American Ceramic Society
Funding Number(s)
CONTRACT_GRANT: IRD-04-10
CONTRACT_GRANT: IRD-04-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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