1.1 This document is a guide to preparing material specifications for fiber reinforced carbon-carbon (C-C) composite structures (flat plates, rectangular bars, round rods, and tubes) manufactured specifically for structural components in nuclear reactor core applications. The carbon-carbon composites consist of carbon/graphite fibers (from PAN, pitch, or rayon precursors) in a carbon/graphite matrix produced by liquid infiltration/pyrolysis and/or by chemical vapor infiltration. 1.2 The guide consists of two sections: 1) a classification system based on fiber and matrix constituents, fiber architecture, physical properties, and mechanical properties and 2) guidance on the development of specifications. The specification guide considers composite constituents and structures, physical and chemical properties, mechanical properties, performance durability, materials and fabrication processing, methods of testing, quality assurance, and traceability. The carbon-carbon composite classes specified here would be suitable for reactor core applications where neutron irradiation induced damage and dimensional changes are a significant design consideration. (Ref. 1- 4) 1.3 This guide provides direction and guidance for the development of a material specification for a specific C-C composite component or product for nuclear reactor applications. The component specification is to be developed by the designer/purchaser/user. The designer/purchaser/user shall define and specify in detail any and all application-specific requirements for necessary design, manufacturing, and performance factors of the ceramic composite component This guide for material specifications does not directly address component/product-specific issues, such as geometric tolerances, permeability, bonding, sealing, attachment, and system integration. 1.4 This specification guide is specifically focused on C-C composite components and structures with flat panel, solid rectangular bar, solid round rod, or tubular geometries. 1.5 This specification may also be applicable to C-C composites used for other structural applications discounting the nuclear-specific chemical purity and irradiation behavior requirements. 1.6 Units - The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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 clear guidance and direction on specifying, producing, and qualifying carbon-carbon composites for use as structural components in nuclear reactors. It will be used by producers, end-users, and regulatory agencies.
Keywordsgraphite;carbon fiber; 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