Issues and advances in SiCf/SiC composites development for fusion reactors

Riccardi, B.; Giancarli, L.; Hasegawa, Akira; Katoh, Yutai; Kohyama, Akira; Jones, R. H.; Snead, Lance Lewis

doi:10.1016/j.jnucmat.2004.04.002

Cited by 186 publications

(76 citation statements)

References 47 publications

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“…The high surface area of the 5 wt % in situsynthesized nano-sized SiC increased the driving force of the powder compacts for densification. An enhancement in the densification of SiC ceramics has been observed when nano-sized SiC, 26)28) polycarbosilane-derived nano-sized SiC, 29) or mechanically alloyed nano-sized SiC powders 10) were used as the starting material. Therefore, the addition of in situ-synthesized nanosized SiC is beneficial for the densification of submicron-sized SiC with a small amount (1 wt %) of additives.…”

Section: )20)mentioning

confidence: 99%

Influence of powder characteristics on the electrical resistivity of SiC ceramics

Lim

Kim

2012

J. Ceram. Soc. Japan

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Four types of commercially available SiC powders were hot-pressed with 1 wt % Dy 2 O 3 AlN additives in a 3:2 molar ratio. Three submicron-sized SiC powders could be densified so as to have a relative density higher than 98%, whereas a micron-sized SiC powder showed limited densification up to 93.5%. SiC ceramics fabricated from ¢-SiC powders exhibited electrical resistivities (³10 ¹1 ³·cm) that were lower than those from ¡-SiC powders (³10 1 ³·cm). The lower electrical resistivity of the SiC ceramics fabricated from ¢-SiC powders could be attributed to a higher carrier density and enhanced charge mobility when compared to the SiC ceramics from ¡-SiC powders.©2012 The Ceramic Society of Japan. All rights reserved.Key-words : SiC, Sintering, Electrical resistivity [Received January 5, 2012; Accepted February 28, 2012] Silicon carbide (SiC) is considered to be a suitable material for various structural applications such as mechanical seals, bearings, cylinder liners, armor plates, and mirror materials for astronomical telescopes due to its superior properties of high hardness, high temperature strength, and excellent resistance to wear and corrosion.1)6) In addition, SiC ceramics with or without a small amount of additives have attracted considerable attention for use in semiconductor processing, nuclear fusion reactors, and high temperature thermomechanical applications because of their excellent chemical and thermal stability and good mechanical properties.7)11) In the mid 1970s, Lange 12) first reported on the successful densification of SiC by liquid-phase sintering with the addition of Al 2 O 3 as a sintering additive. Since this innovative work, interest in liquid-phase sintered (LPS)-SiC has grown continuously because such materials exhibit better mechanical properties than solid-state sintered SiC ceramics.2),6),13)17) Methods for the successful densification of SiC ceramics with a smaller amount of sintering additives via liquid-phase sintering include (1) the use of colloidal processing for the homogeneous distribution of sintering additives 18),19) and (2) the addition of in situsynthesized nano-sized SiC into submicron-sized SiC powders. 20) In this study, the sinterability of four different commercially available SiC powders was investigated with the addition of 1 wt % AlNDy 2 O 3 additives by hot pressing. The effect of the SiC powder characteristics on the electrical resistivity of the hot-pressed SiC ceramics was also investigated. The AlNDy 2 O 3 additive system was selected because of the success of previous research on the densification of SiC with AlN-rare earth oxide systems 4),11) and the good chemical stability of Dy 2 O 3 at high temperatures in the presence of SiC. 21)Four types of commercially available SiC powders were used as starting materials; their characteristics are shown in Table 1. The crystalline phase of powders A1 and A2 is ¡-SiC, while that of B1 and B2 is ¢-SiC. 22) The mixtures were dried, sieved (60 mesh), pressed uniaxially, and heat-treated at 200°C for 2 h in air so ...

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Section: )20)mentioning

confidence: 99%

Influence of powder characteristics on the electrical resistivity of SiC ceramics

Lim

Kim

2012

J. Ceram. Soc. Japan

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“…The use of SiC-SiC either as structural material or as heat insulation liner material would allow He-coolant temperatures in a range up to 1000°C. 13 In order to remove heat fluxes of up to 20 MW/m 2 from the divertor, heat sink materials with very high thermal conductivity have to be applied. In the ITER divertor CuCrZr alloy will be used.…”

Section: Materials Issues For Plasma-facing Componentsmentioning

confidence: 99%

Materials for the plasma-facing components of fusion reactors

Bolt¹,

Barabash²,

Krauß³

et al. 2004

Journal of Nuclear Materials

551

251

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According to current knowledge and understanding, nuclear fusion can be developed to a sustainable energy technology. Fuel is abundant and key points as fusion power production and alpha particle heating have already been demonstrated. The next-step device ITER (International Thermonuclear Experimental Reactor) is designed to demonstrate net power production and to address most of the technological issues on the way to a power reactor. There is, however, a

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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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Issues and advances in SiCf/SiC composites development for fusion reactors

Cited by 186 publications

References 47 publications

Influence of powder characteristics on the electrical resistivity of SiC ceramics

Influence of powder characteristics on the electrical resistivity of SiC ceramics

Materials for the plasma-facing components of fusion reactors

Influence of Grain Size on Thermal Conductivity of SiC Ceramics

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