Recent advances and issues in development of silicon carbide composites for fusion applications

Nozawa, Takashi; Hinoki, Tatsuya; Hasegawa, Akira; Kohyama, Akira; Katoh, Yutai; Snead, Lance Lewis; Henager, Charles H.; Hegeman, J.B.J.

doi:10.1016/j.jnucmat.2008.12.305

Cited by 131 publications

(49 citation statements)

References 37 publications

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“…SiC fiber reinforced-SiC ceramic matrix (SiC f /SiC) composites are expected to apply as structure materials for fusion reactor systems because of their low activation, mechanical and chemical stability at high temperature [1][2][3]. The research of SiC ceramics and/or SiC f /SiC composites is being carried out to improve of mechanical and thermal property because their properties are decreased by neutron irradiation and elevated temperature [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Grain Size on Thermal Conductivity of SiC Ceramics

Lee¹,

Park²,

Hinoki³

2011

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. SiC fiber reinforced-SiC ceramic matrix (SiC f /SiC) composites are one of the candidate structural materials for nuclear fusion reactors systems because of their low activation, mechanical property and chemical stability at high temperature. High thermal conductivity of SiC f /SiC composites is required to reduce heat load and to provide high thermal conversion efficiency. The objective of this study is to determine thermal conductivity on grain size dependence of SiC ceramics which is the matrix in composites. β-SiC powder was sintered by hot-press method. Al 2 O 3 and Y 2 O 3 were used as sintering additives. The grains size was grew with increase of holding time at 1900 o C. Thermal conductivity of SiC ceramics was gradually increased up to 112 W/mK. Thermal conductivity of SiC ceramics is dependent on growth of grain size due to the scattering of the phonon by the grain boundaries leads to a sizedependence.

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Section: Introductionmentioning

confidence: 99%

Influence of Grain Size on Thermal Conductivity of SiC Ceramics

Lee¹,

Park²,

Hinoki³

2011

IOP Conf. Ser.: Mater. Sci. Eng.

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“…By acting as sinks for radiation-induced point defects, the high density of interfaces in nanolayered metallic composites are postulated to reduce radiation damage (Heinisch et al 2004;Misra et al 2007;Henager et al 2009;Nozawa et al 2009). A detailed understanding of the influence of layer spacing and type of interface on damage tolerance would enable tailoring the interfaces for effective trapping and annihilation of radiation-induced defects.…”

Section: Radiation Damage Tolerance Of Nanolayered Compositesmentioning

confidence: 99%

Compact X-ray Light Source Workshop Report

Thevuthasan¹,

Evans²,

Terminello³

et al. 2012

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Executive SummaryThis report is the result of a workshop held in September 2011 that examined the utility of a compact x-ray light source (CXLS) in addressing many scientific challenges critical to advancing energy science and technology. The U.S. Department of Energy (DOE) and National Academy of Sciences (NAS) have repeatedly described the need for advanced instruments that "predict, control, and design the components of energetic processes and environmental balance," most notably in biological, chemical, environmental, and materials science. In numerous DOE and NAS reports, direct molecular-scale imaging and timedependent studies are seen as a powerful means to develop an atomistic-level understanding of scientific issues associated with current and future energy and environmental needs, including energy production and storage from both fossil-based and fossil-free sources and cleanup of government and industrial sites worldwide.One of the major enabling capabilities for meeting these needs is a high-brightness x-ray light source. The DOE report, Next-Generation Photon Sources for Grand Challenges in Science and Energy, identifies "spectroscopic and structural imaging of nano-objects (or nanoscale regions of inhomogeneous materials) with nanometer spatial resolution and ultimate spectral resolution" as one of the two aspects of energy science in which current and next-generation x-ray light sources will have the deepest and broadest impact. The report further stresses the power of direct observation in understanding transformational chemical processes. The report also discusses the importance of molecular "movies" of complex reactions that show bond breaking and reforming in natural time scales, along with the intermediate states to understand the mechanisms that govern chemical transformations. Existing accelerator-based x-ray sources have greatly extended capabilities in the time and space domain for scientific investigations in many disciplines. Despite these successes, a number of scientific challenges would benefit greatly from having an x-ray resource that has much of the attractive capability of these large machines but lends itself to operating in conjunction with other characterization tools in a correlative fashion. Such an integrated multiscale and multimodal approach could fully address the fundamental needs expressed by DOE's Office of Biological and Environmental Research (BER) in regards to understanding how genomic information is translated with confidence to redesign microbes, plants, or ecosystems (http://science.energy.gov/).Fortunately, recent advances in laser and super-cooled linear particle accelerator, or linac, technology have enabled development of a long-promised CXLS that uses inverse Compton scattering for generating x-rays. The new CXLS holds the promise of simultaneous energy tuning-from the soft to hard x-ray regime-as well as a pulsed structure closely coupled to the laser pulse duration of pico-to femtoseconds. With a projected brilliance equal to third-generation light sourc...

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“…SiC/SiC composites are promising structural materials for advanced energy and aero-space systems because of low gravity and excellent stability in thermo-mechanical properties and microstructure against severe environment including high temperature and neutron irradiation [1][2][3]. SiC/SiC composites have been fabricated by three common ways to create the matrix: through chemical vapor infiltration (CVI) [4], polymer infiltration and pyrolysis (PIP) [5] and reaction sintering/melting infiltration (RS/MI) processes [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Preform Densification on Near-Net Shaping of NITE-SiC/SiC Composites

Nakazato

Kishimoto

Shimoda

et al. 2011

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Large volumetric shrinkage (~50 Vol%) occurs during ceramic matrix composites fabrication by hot-pressing due to infiltration and densification process of powder for matrix formation, resulting in unfortunately significant fiber-architecture and -strength damage. This study tries to explore damage-less near-net shaping technique by preform densification before hot-pressing in Nano-Infiltration and Transient Eutectic-phase (NITE) process. In particular, effects of preform densification for the damage-less near-net shaping, important influencing elements such as fiber-architecture, microstructural integrity and homogeneity, and composite's mechanical properties were evaluated using simple shaped (plate) and complex shaped composites. The preform densification demonstrated protective fiber-architecture in complex shaped composites and enhanced composites' density to 2.77/cm 3 and ultimate bending strength to ~200 MPa in simple shaped composites, owing to significantly reduced volumetric shrinkage. IntroductionSiC/SiC composites are promising structural materials for advanced energy and aero-space systems because of low gravity and excellent stability in thermo-mechanical properties and microstructure against severe environment including high temperature and neutron irradiation [1][2][3]. SiC/SiC composites have been fabricated by three common ways to create the matrix: through chemical vapor infiltration (CVI) [4], polymer infiltration and pyrolysis (PIP) [5] and reaction sintering/melting infiltration (RS/MI) processes [6]. Nano-Infiltration and Transient Eutectic-phase (NITE) process is one of the most attractive process for SiC/SiC composites fabrication to provide high performance on thermo-mechanical properties and gas tightness and acceptable cost [7][8][9]. The key technology in NITE process required for the production of complex shape is near-net shaping technique. In general, large volumetric shrinkage (~50 vol%) occurs during ceramic matrix composites fabrication by hotpressing like NITE process due to infiltration and densification process of powder for matrix formation, resulting in unfortunately significant fiber-architecture and -strength damage. Therefore, the method development for suppression of large volumetric shrinkage during hot-pressing is essential

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Recent advances and issues in development of silicon carbide composites for fusion applications

Cited by 131 publications

References 37 publications

Influence of Grain Size on Thermal Conductivity of SiC Ceramics

Influence of Grain Size on Thermal Conductivity of SiC Ceramics

Compact X-ray Light Source Workshop Report

Effects of Preform Densification on Near-Net Shaping of NITE-SiC/SiC Composites

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