1.1 本文件是为碳化硅纤维/碳化硅基体（SiC-SiC）复合结构（平板、矩形棒、圆棒和管）编制材料规范的指南，这些结构专门为核反应堆堆芯应用中的结构部件和燃料包壳制造。SiC-SiC复合材料由碳化硅基体中的碳化硅纤维组成，所述碳化硅基体通过液体渗透/热解和/或通过化学气相渗透产生。 1.2 本指南为核反应堆应用的特定SiC-SiC复合材料部件或产品的材料规范的制定提供了指导和指导。该指南考虑了复合材料的成分和结构、物理和化学性能、机械性能、热性能、性能耐久性、测试方法、材料和制造工艺以及质量保证。 这里考虑的SiC-SiC复合材料将适用于核反应堆堆芯应用，其中中子辐照引起的损伤和尺寸变化是重要的设计考虑因素。 ( 1. 8. ) 2. 1.3 部件材料规范由设计者/购买者/用户制定。设计者/购买者/用户应详细定义和规定陶瓷复合材料部件的设计、制造、性能和质量保证的任何和所有特定应用要求。根据预期用途，如几何公差、渗透性、粘合、密封、连接和系统集成，可能需要特定组件的附加规范项目，而不是本指南中列出的项目。 1.4 本指南特别关注具有平板、实心矩形棒、实心圆棒和管状几何形状的SiC-SiC复合材料部件和结构。 1.5 本指南也可适用于开发用于其他结构应用的SiC-SiC复合材料的规范，不考虑核特定化学纯度和辐照行为因素。 1.6 单位-- 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.7 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 复合材料由基体相中的增强相的定义组成。此外，陶瓷基复合材料（CMC）通常含有可测量的孔隙率，这些孔隙率与增强材料和基体相互作用。SiC-SiC复合材料通常使用具有重要力学功能的纤维界面涂层。CMC中这些不同成分的组成和结构通常针对具有详细性能要求的特定应用而定制。 剪裁涉及增强纤维（成分、性能、形态等）、基体（成分、特性和形态）、复合材料结构（组分、增强结构、界面涂层、孔隙结构、微观结构等）和制造条件（成型、组装、成型、致密化、精整等）的选择。最终的工程性质（物理、机械、热学、电学等）可以在性质具有主要方向各向异性的大范围内进行定制。 4.2 制定了涵盖材料、材料加工和制造程序的特定CMC组件的规范，为制造可复制和可靠的结构提供了基础。 设计者/用户/生产商必须为具有明确组成、结构、性能和加工要求的特定应用程序编写CMC规范。但是，由于CMC在成分、结构和性能方面的广泛选择，几乎不可能编写适用于任何和所有CMC应用的“通用”CMC规范，该规范具有相同类型的结构和金属合金常用规范的细节。本指南旨在帮助设计者/用户/生产商为特定CMC应用/部件制定全面详细的材料规范，特别关注核应用。 4.3 本指南旨在就如何规定SiC的成分、结构、所需工程性能（物理、化学、机械、耐久性等）、测试方法、制造工艺要求、质量保证要求和可追溯性提供指导- 用于核反应堆应用的SiC复合材料。由此产生的规范可用于核反应堆结构用SiC-SiC复合材料的设计、生产、评估和鉴定。 4.4 该指南适用于具有平板、矩形棒、圆棒和圆管几何形状的SiC-SiC复合材料。 4.5 本指南也可适用于开发用于其他结构应用的SiC-SiC复合材料的规范，不考虑核特定化学纯度和辐照行为要求。

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 applications, discounting the nuclear-specific chemical purity and irradiation behavior factors. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 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. ====== 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 on how to specify the constituents, the structure, the desired engineering properties (physical, chemical, mechanical, durability, etc), methods of testing, manufacturing process requirements, the quality assurance requirements, and traceability for SiC-SiC composites for nuclear reactor applications. The resulting specification may be used for the design, production, evaluation, and qualification of SiC-SiC composites for structures in nuclear reactors. 4.4 The guide is applicable to SiC-SiC composites with flat plate, rectangular bar, round rod, and round tube geometries. 4.5 This guide may also be applicable to the development of specifications for SiC-SiC composites used for other structural applications, discounting the nuclear-specific chemical purity and irradiation behavior requirements.