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Name: 35v/o SCS-9a-(20v/oRBSiC/ZrB2)
Database: NASA Ames Thermal Protection Materials
Category: Ultra-High Temperature Ceramics
Composition: N/A
Manufacturer: Advanced Ceramics Research, Tucson, Arizona.
Technical Readiness Level: N/A
Last Modified: 1998-11-17

Description:

• The 35v/o SCS-9a-(20v/oRBSiC/ZrB2) CFCC is one of a family of ultra-high temperature, multi-use ceramic matrix composites developed in a NASA ARC funded SBIR. It, like other UHTC materials, is intended to be used in TPS applications. It was specifically developed as a ultra high temperature structural material to facilitate attaching other UHTC materials in TPS. Because of its large strain-to- failure, low modulus, and failure characteristics it may be suitable for many other applications including large panel TPS. Orthotropic mechanical properties for a unidirectional lay-up (nominally 10 plies) were computed with COSTAR. These computation were optimized so that good agreement was obtained with measured tensile properties. Thermal properties are from measured values except for the specific heat. The material is fabricated ply by ply and so other composite architecture are possible are, i.e., [0/90]s. Consolidation is achieved by uni- axial hot pressing. This material is fabricated exclusively by Advanced Ceramics Research of Tucson, Arizona. Because of the planarity and large volume fraction of SiC fibers in this material a oxidation protection coating is recommended for TPS applications. Such a coating has been optimized for this material by Ultramet of Pacoima, CA in a separate NASA ARC funded SBIR program The coating, called Ultra-2000, is a CVD codeposited HfC/SiC with a nominal thickness of 5 mils. Maximum single use temperature is based on observed performance of the oxidation protection coating (ULTRA-2000). Parallel, longitudinal or axial properties are in the fiber direction and normal properties are perpendicular or transverse to the fiber. Thin plates of this material can be considered transversely isotropic.

Point of Contact:

• Donald T. Ellerby
• NASA Ames Research Center
• dellerby@mail.arc.nasa.gov