Deposition and microhardness of SiC from the Si2Cl6-C3H8-H2-Ar system

Motojima, Seiji; Iwamori, Noriyuki; Hattori, Taku; Kurosawa, Kaoru

doi:10.1007/bf00553276

Cited by 19 publications

(1 citation statement)

References 18 publications

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“…The thickness SiC crucible wall has the high-density structure with small quantity of the pores (Fig. 3 d) and the values of Hv and K 1C are very high, and they have a good agreement with the literature data (Hv = 33 -38 GPa, K 1C = 3 -3.5 MPa m 0.5 [6,15,16,17]). In case of RBSiC-matrix, the value of Hv is in 1.4 times less then that for SiC crucible wall, but this correlates with the reference date for Reaction-Bonded SiC ceramic (Hv = 21 -34 GPa, K 1C = 3.6 -4.2 MPa m 0.5 [18,19]).…”

Section: Resultssupporting

confidence: 82%

Synthesis and Properties of Reaction-Bonded SiC Ceramic with Embedded UO<sub>2</sub> - TRISO Coated Particles

Bukaemskiy

Fachinger²,

Bosbach

2010

Advances in Science and Technology

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Ceramics based on SiC are characterized by extreme hardness, high thermal conductivity, relatively low thermal expansion and chemical durability. In principle, SiC ceramics can be considered as a long-term stable matrix for final disposal of radioactive waste, such as coated fuel particles (CP) separated from the graphite matrix from spent HTR (high-temperature gas-cooled reactor) fuel pebbles. In the present work, SiC-based ceramic with the embedded UO2 - TRISO (tristructural-isotropic) coated particles was synthesized by the reaction-bonding process. The synthesis was performed in standard SiC crucible. Several physico-mechanical properties of the synthesized samples were investigated. It was shown that the coated particles in the reaction-bonded silicon carbide (RBSiC) matrix are distributed homogeneously. The amount of pores is insignificant and the crippling of the coated particles is not observed. Besides, the junction between CP and RBSiC matrix and between RBSiC matrix and the SiC crucible is very good. For all ceramic components of the synthesized samples, namely, for the UO2-kernels, SiC-layers, SiC crucible wall and for the synthesized RBSiC ceramics, the values of microhardness and fracture toughness were measured and compared with the reference data. The strength properties, such as tensile strength of the synthesized samples, failure mechanism of the reaction-bonded SiC ceramic with embedded UO2 - TRISO coated particles, microstructure of the fracture surfaces, the peculiarities of the coated particles fracture were investigated in detail. Moreover, the diffusion of radioactive tracers (137Cs, 241Am, 36Cl, 3H) across synthesized ceramic was studied and the high safety characteristics of the synthesized ceramic were demonstrated.

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Section: Resultssupporting

confidence: 82%