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The development of advanced nuclear energy systems imposes stringent requirements on the service stability of nuclear materials under extreme environments characterized by multiple stressors. Continuous silicon-carbide-fiber-reinforced silicon carbide (SiCf/SiC) ceramic matrix composites possess advantages such as low density, excellent high-temperature mechanical properties,corrosion resistance, and irradiation tolerance. Furthermore, SiCf/SiC composites demonstrate a pseudo-ductile fracture behavior under external forces, positioning them as highly promising structural materials for advanced nuclear energy systems. This study systematically summarizes the fundamental research framework on nuclear-grade SiCf/SiC composites at the material, component,and service performance levels. It also analyzes the developmental trends in this field among traditional nuclear powerhouses such as the United States, France, and Japan, as well as in other emerging nuclear energy countries and China. Furthermore, the study identifies existing issues and challenges faced by China’s nuclear-grade SiCf/SiC sector in terms of raw materials, data accumulation,and patent standards, and proposes targeted measures and suggestions: (1) strengthening the research and development of material preparation technologies, (2) developing a new paradigm of research and development, (3) reinforcing the industry-universityresearch-application cooperation, and (4) enhancing international exchanges on the basis of maintaining independence. The aim of the study is to provide guidance and reference for the research directions and policy-making in China’s nuclear-grade SiCf/SiC sector.

To address the issue of brittleness of W, Wf/W composite mixed with varying proportions of raw Wf (Wf (raw)) and Y2O3-coated Wf (Wf (Y2O3)) were prepared using SPS. With the combination of strong and weak interface bonding, the composite with high strength and toughness, and pseudo-ductile fracture at room temperature was eventually accomplished by designing the addition ratio of Wf(raw) and Wf(Y2O3). The results showed that when the addition ratio of Wf(raw) and Wf(Y2O3) were 10vol.% and 20vol.%, the flexural strength and fracture toughness of the composite exhibited the better results, which were 551.16 MPa and 7.30 MPa·m1/2, respectively. They were higher than the non-fiber W alloy prepared by the same process (443.59 MPa and 5.97 MPa·m1/2). [ABSTRACT FROM AUTHOR]