• Title/Summary/Keyword: $SiC_f$/SiC composite

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Fabrication of SiCf/SiC Composites using an Electrophoretic Deposition

  • Lee, Jong-Hyun;Gil, Gun-Young;Yoon, Dang-Hyok
    • Journal of the Korean Ceramic Society
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    • v.46 no.5
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    • pp.447-451
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    • 2009
  • Continuous SiC fiber-reinforced SiC composites ($SiC_f$/SiC) were fabricated by electrophoretic deposition (EPD). Nine types of slurries with different powder contents, binder resin amounts and slurry pH were deposited on Tyranno$^{TM}$-SA fabrics by EPD at 135 V for ten minutes to determine the optimal conditions. Further EPD using the optimum slurry conditions was performed on fabrics with four different pyrolitic carbon (PyC) thicknesses. The density of the hot-pressed composites decreased with increasing PyC thickness due to the difficulty of infiltrating the slurry into the narrow gaps between the fibers. On the other hand, the mechanical strength increased with increasing PyC thickness despite the decrease in density, which was explained by the enhanced crack deflection with increasing PyC thickness. The $SiC_f$/SiC composites showed the highest density and flexural strength of 94% and 342 MPa, respectively, showing EPD as a feasible method for dense $SiC_f$/SiC fabrication.

A Review of SiCf/SiC Composite to Improve Accident-Tolerance of Light Water Nuclear Reactors (원자력 사고 안전성 향상을 위한 SiCf/SiC 복합소재 개발 동향)

  • Kim, Daejong;Lee, Jisu;Chun, Young Bum;Lee, Hyeon-Geun;Park, Ji Yeon;Kim, Weon-Ju
    • Composites Research
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    • v.35 no.3
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    • pp.161-174
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    • 2022
  • SiC fiber-reinforced SiC matrix composite is a promising accident-tolerant fuel cladding material to improve the safety of light water nuclear reactors. Compared to the current zirconium alloy fuel cladding as well as metallic accident-tolerant fuel cladding, SiC composite fuel cladding has exceptional accident-tolerance such as excellent structural integrity and extremely low corrosion rate during severe accident of light water nuclear reactors, which reduces reactor core temperature and delays core degradation processes. In this paper, we introduce the concept, technical issues, and properties of SiC composite accident-tolerant fuel cladding during operation and accident scenarios of light water nuclear reactors.

Nondestructive Evaluation of Microstructure of SiCf/SiC Composites by X-Ray Computed Microtomography

  • Kim, Weon-Ju;Kim, Daejong;Jung, Choong Hwan;Park, Ji Yeon;Snead, Lance L.
    • Journal of the Korean Ceramic Society
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    • v.50 no.6
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    • pp.378-383
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    • 2013
  • Continuous fiber-reinforced ceramic matrix composites (CFCCs) have a complex distribution of porosity, consisting of interfiber micro pores and interbundle/interply macro pores. Owing to the complex geometry of the pores and fiber architecture, it is difficult to obtain representative microstructural features throughout the specimen volume with conventional, destructive ceramographic approaches. In this study, we introduce X-ray computed microtomography (X-ray ${\mu}CT$) to nondestructively analyze the microstructures of disk shaped and tubular $SiC_f$/SiC composites fabricated by the chemical vapor infiltration (CVI) method. The disk specimen made by stacking plain-woven SiC fabrics exhibited periodic, large fluctuation of porosity in the stacking direction but much less variation of porosity perpendicular to the fabric planes. The X-ray ${\mu}CT$ evaluation of the microstructure was also effectively utilized to improve the fabrication process of the triple-layered tubular SiC composite.

Effects of Al2O3-RE2O3 Additive for the Sintering of SiC and the Fabrication of SiCf/SiC Composites (SiC 소결에 미치는 Al2O3-RE2O3 첨가제의 영향과 SiCf/SiC 복합체의 제조)

  • Yu, Hyun-Woo;Raju, Kati;Park, Ji Yeon;Yoon, Dang-Hyok
    • Journal of the Korean Ceramic Society
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    • v.50 no.6
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    • pp.364-371
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    • 2013
  • The sintering behavior of monolithic SiC is examined using the binary sintering additive of $Al_2O_3$-rare earth oxide ($RE_2O_3$, where RE = Sc, Nd, Dy, Ho, or Yb). Through hot pressing at 20 MPa and $1750^{\circ}C$ for 1 h in an Ar atmosphere for 52 nm fine ${\beta}$-SiC powder added with 5 wt% sintering additive, a SiC density of > 97% is achieved, which indicates the effectiveness of $Al_2O_3-RE_2O_3$ system as a sintering of additive for SiC. Based on this result, 7 wt% of $Al_2O_3-Sc_2O_3$ is tested as an additive system for the fabrication of a continuous SiC fiber-reinforced SiC-matrix composite ($SiC_f$/SiC). Electrophoretic deposition combined with the application of ultrasonic pulses is used to efficiently infiltrate the matrix phase into the voids of $Tyranno^{TM}$-SA3 fabric. After hot pressing, a composite density of > 97% is obtained, along with a maximum flexural strength of 443 MPa.

Oxidation Behaviors of SiCf/SiC Composites Tested at High Temperature in Air by an Ablation Method

  • Park, Ji Yeon;Kim, Daejong;Lee, Hyeon-Geun;Kim, Weon-Ju;Pouchon, Manuel
    • Journal of the Korean Ceramic Society
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    • v.55 no.5
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    • pp.498-503
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    • 2018
  • Using the thermal ablation method, the oxidation behavior of $SiC_f/SiC$ composites was investigated in air and in the temperature range of $1,300^{\circ}C$ to $2,000^{\circ}C$. At the relatively low temperature of $1,300^{\circ}C$, passive oxidation, which formed amorphous phase, predominantly occurred in the thermal ablation test. When the oxidation temperature increased, SiO (g) and CO (g) were formed by active oxidation and the dense oxide layer changed to a porous one by vaporization of gas phases. In the higher temperature oxidation test, both active oxidation due to $SiO_2$ decomposition on the surface of the oxide layer and active/passive oxidation transition due to interfacial reaction between oxide and base materials such as SiC fiber and matrix phase simultaneously occurred. This was another cause of high temperature degradation of $SiC_f/SiC$ composites.

The Effect of Cyclic Loading History on the Creep of $SiC_f/Si_3N_4$ Fiber-reinforced Composite (사이클 하중이력이 $SiC_f/Si_3N_4섬유강화 복합재료의 크리프에 미치는 영향)

  • 박용환
    • Journal of the Korean Society of Safety
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    • v.15 no.4
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    • pp.35-40
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    • 2000
  • The influence of cyclic loading history on the creep behavior of the 30 vol% hot-pressed $SiC_f/Si_3N_4copmposite was experimentally investigated at $1200^{\circ}C$. The duration of loading/unloading had great effects on the creep behaviors. The short term duration cyclic loading history test results showed significant reduction in the primary and steady-state creep rates. For example, 300sec loading/300sec unloading history resulted in 70% lower steady-state creep rate than that of the continuous loading. However the long term duration cyclic loading history test results showed little change in creep rates compared to those of the continuous one. The reason for the significant change in the short term duration cycles was estimated due to the change in the stress redistribution between the fiber and matrix during the creep recovery in the primary stage.

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Effect of Fiber Dispersion on Mechanical Strength of SiCf/SiC Composites (강화 섬유의 분산도가 SiCf/SiC 복합소재의 기계적 강도에 미치는 영향)

  • Ji Beom Choi;Soo-Hyun Kim;Seulhee Lee;In-Sub Han;Hyung-Joon Bang;Seyoung Kim;Young-Hoon Seong
    • Composites Research
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    • v.36 no.3
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    • pp.180-185
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    • 2023
  • This paper investigates the impact of fiber dispersion on the internal structure and mechanical strength of SiCf/SiC composites manufactured using spread SiC fibers. The fiber volume ratio of the specimen to which spread SiC fiber was applied decreased by 9%p compared to the non-spread specimen, and the resin slurry impregnated between the fibers more smoothly, resulting in minimal matrix porosity. In order to compare the fiber dispersion of each specimen, a method was proposed to quantify and evaluate the separation distance between fibers in composite materials. The results showed that the distance between fibers in the spread specimen increased by 2.23 ㎛ compared to the non-spread specimen, with a significant 42.6% increase in the distance between fiber surfaces. Furthermore, the 3pt bending test demonstrated a 49.3% higher flexural strength in the spread specimen, accompanied by a more uniform deviation in test data. These findings highlight the significant influence of SiC fiber dispersion on achieving uniform densification of the SiCf/SiC matrix and increasing mechanical strength.