ASTM C1793-15(2024)
(Guide)Standard Guide for Development of Specifications for Fiber Reinforced Silicon Carbide-Silicon Carbide Composite Structures for Nuclear Applications
Standard Guide for Development of Specifications for Fiber Reinforced Silicon Carbide-Silicon Carbide Composite Structures for Nuclear Applications
SIGNIFICANCE AND USE
4.1 Composite materials consist by definition of a reinforcement phase in a matrix phase. In addition, ceramic matrix composites (CMCs) often contain measurable porosity which interacts with the reinforcement and matrix. And SiC-SiC composites often use a fiber interface coating which has an important mechanical function. The composition and structure of these different constituents in the CMC are commonly tailored for a specific application with detailed performance requirements. The tailoring involves the selection of the reinforcement fibers (composition, properties, morphology, etc.), the matrix (composition, properties, and morphology), the composite structure (component fractions, reinforcement architecture, interface coatings, porosity structure, microstructure, etc.), and the fabrication conditions (forming, assembly, forming, densification, finishing, etc.). The final engineering properties (physical, mechanical, thermal, electrical, etc.) can be tailored across a broad range with major directional anisotropy in the properties.
4.2 Specifications for specific CMC components covering materials, material processing, and fabrication procedures are developed to provide a basis for fabricating reproducible and reliable structures. Designer/users/producers have to write CMC specifications for specific applications with well-defined composition, structure, properties and processing requirements. But with the extensive breadth of selection in composition, structure, and properties in CMCs, it is virtually impossible to write a "generic" CMC specification applicable to any and all CMC applications that has the same type of structure and details of the commonly-used specifications for metal alloys. This guide is written to assist the designer/user/producer in developing a comprehensive and detailed material specification for a specific CMC application/component with a specific focus on nuclear applications.
4.3 The purpose of this guide is to provide guidance o...
SCOPE
1.1 This document is a guide to preparing material specifications for silicon carbide fiber/silicon carbide matrix (SiC-SiC) composite structures (flat plates, rectangular bars, round rods, and tubes) manufactured specifically for structural components and for fuel cladding in nuclear reactor core applications. The SiC-SiC composites consist of silicon carbide fibers in a silicon carbide matrix produced by liquid infiltration/pyrolysis and/or by chemical vapor infiltration.
1.2 This guide provides direction and guidance for the development of a material specification for a specific SiC-SiC composite component or product for nuclear reactor applications. The guide considers composite constituents and structure, physical and chemical properties, mechanical properties, thermal properties, performance durability, methods of testing, materials and fabrication processing, and quality assurance. The SiC-SiC composite materials considered here would be suitable for nuclear reactor core applications where neutron irradiation-induced damage and dimensional changes are significant design considerations. (1-8)2
1.3 The component material 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 design, manufacturing, performance, and quality assurance of the ceramic composite component. Additional specification items for a specific component, beyond those listed in this guide, may be required based on intended use, such as geometric tolerances, permeability, bonding, sealing, attachment, and system integration.
1.4 This guide is specifically focused on SiC-SiC composite components and structures with flat plate, solid rectangular bar, solid round rod, and tubular geometries.
1.5 This guide may also be applicable to the development of specifications for SiC-SiC composites used for other structural applic...
General Information
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1793 − 15 (Reapproved 2024)
Standard Guide for
Development of Specifications for Fiber Reinforced Silicon
Carbide-Silicon Carbide Composite Structures for Nuclear
1
Applications
This standard is issued under the fixed designation C1793; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.5 This guide may also be applicable to the development of
specifications for SiC-SiC composites used for other structural
1.1 This document is a guide to preparing material specifi-
applications, discounting the nuclear-specific chemical purity
cations for silicon carbide fiber/silicon carbide matrix (SiC-
and irradiation behavior factors.
SiC) composite structures (flat plates, rectangular bars, round
rods, and tubes) manufactured specifically for structural com- 1.6 Units—The values stated in SI units are to be regarded
ponents and for fuel cladding in nuclear reactor core applica- as standard. No other units of measurement are included in this
tions. The SiC-SiC composites consist of silicon carbide fibers standard.
in a silicon carbide matrix produced by liquid infiltration/
1.7 This standard does not purport to address all of the
pyrolysis and/or by chemical vapor infiltration.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
1.2 This guide provides direction and guidance for the
priate safety, health, and environmental practices and deter-
development of a material specification for a specific SiC-SiC
mine the applicability of regulatory limitations prior to use.
composite component or product for nuclear reactor applica-
1.8 This international standard was developed in accor-
tions. The guide considers composite constituents and
dance with internationally recognized principles on standard-
structure, physical and chemical properties, mechanical
ization established in the Decision on Principles for the
properties, thermal properties, performance durability, methods
Development of International Standards, Guides and Recom-
of testing, materials and fabrication processing, and quality
mendations issued by the World Trade Organization Technical
assurance. The SiC-SiC composite materials considered here
Barriers to Trade (TBT) Committee.
would be suitable for nuclear reactor core applications where
neutron irradiation-induced damage and dimensional changes
2 2. Referenced Documents
are significant design considerations. (1-8)
3
2.1 ASTM Standards:
1.3 The component material specification is to be developed
C242 Terminology of Ceramic Whitewares and Related
by the designer/purchaser/user. The designer/purchaser/user
Products
shall define and specify in detail any and all application-
C559 Test Method for Bulk Density by Physical Measure-
specific requirements for design, manufacturing, performance,
ments of Manufactured Carbon and Graphite Articles
and quality assurance of the ceramic composite component.
C577 Test Method for Permeability of Refractories
Additional specification items for a specific component, be-
C611 Test Method for Electrical Resistivity of Manufactured
yond those listed in this guide, may be required based on
Carbon and Graphite Articles at Room Temperature
intended use, such as geometric tolerances, permeability,
C625 Practice for Reporting Irradiation Results on Graphite
bonding, sealing, attachment, and system integration.
C714 Guide for Thermal Diffusivity of Carbon and Graphite
1.4 This guide is specifically focused on SiC-SiC composite
by Thermal Pulse Method
components and structures with flat plate, solid rectangular bar,
C769 Test Method for Sonic Velocity in Manufactured
solid round rod, and tubular geometries.
Carbon and Graphite Materials for Use in Obtaining an
Approximate Value of Young’s Modulus
C816 Test Method for Sulfur Content in Graphite by
1
This guide is under the jurisdiction of ASTM Committee C28 on Advanced
Combustion-Iodometric Titration Method
Ceramics and is the direct responsibility of Subcommittee C28.07 on Ceramic
Matrix Composites.
Current edition approved Jan. 1, 2024. Published February 2024. Originally
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approved in 2015. Last previous edition approved in 2015 as C1793 – 15. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/C1793-15R24. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
The boldface numbers in parentheses refer to the list of references at the end of Sta
...
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