1.1 This specification covers silicon-carbide fiber/silicon carbide matrix (SiC-SiC) composite structures (flat plates, rectangular bars, round rods, and tubes) manufactured specifically for fuel cladding and structural components in nuclear reactor core applications. The specification includes a classification system and specification requirements/ recommendations for physical and chemical properties, mechanical properties, thermal properties, performance durability, materials and fabrication processing, methods of testing, and quality assurance. The SiC-SiC composite materials specified here would be suitable for reactor core applications where neutron irradiation-induced damage and dimensional changes are a significant design consideration. 1.2 This specification is also applicable to SiC-SiC composites used for other structural applications, disregarding the nuclear-specific chemical purity requirements. 1.3 This specification is specifically focused on SiC-SiC composite components and structures with flat plate, solid rectangular bar, solid round rod, and tubular geometries. 1.4 Units - The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This classification and specification document is needed to provide guidance and direction on specifying, producing, and qualifying silicon carbide-silicon carbide composites for use as structural components in nuclear reactors. This specification will be used by government regulatory agencies, standards development organizations, nuclear power OEMs, and CMC producers for design,
KeywordsSilicon carbide composites; silicon carbide fiber; nuclear reactor; mechanical properties; physical properties; thermal properties; chemical properties; durability; fabrication; processing.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top