• Title/Summary/Keyword: Ceramic deposition

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Effect of the supporting substrate on the production yield for geometrically controlled carbon coils

  • Park, Se-Mi;Kim, Sung-Hoon;Jeon, Young-Chul;Kim, DongUk
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2012.05a
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    • pp.218-219
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    • 2012

  • Carbon coils could be synthesized using $C_2H_2/H_2$ as source gases and $SF_6$ as an incorporated additive gas under thermal chemical vapor deposition system. Prior to the carbon coils deposition reaction, two kinds of samples having different combination of Ni catalyst and substrate were employed, namely a commercially-made $Al_2O_3$ ceramic boat with Ni powders and a commercially-made $Al_2O_3$ substrate with Ni layer. By using a commercially-made $Al_2O_3$ ceramic boat, the production yield of carbon coils could be enhanced as much as 10 times higher than that of $Al_2O_3$ substrate. Furthermore, the dominant formation of the microsized carbon coils could be obtained by using $Al_2O_3$ ceramic boat.

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HCCR breeding blankets optimization by changing neutronic constrictions

  • Zadfathollah Seighalani, R.;Sedaghatizade, M.;Sadeghi, H.
    • Nuclear Engineering and Technology
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    • v.53 no.8
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    • pp.2564-2569
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    • 2021

  • The neutronic analysis of Helium Cooled Ceramic Reflector (HCCR) breeding blankets has been performed using the 3D Monte Carlo code MCNPX and ENDF nuclear data library. This study aims to reduce 6Li percentage in the breeder zones as much as possible ensuring tritium self-sufficiency. This work is devoted to investigating the effect of 6Li percentage on the HCCR breeding blanket's neutronic parameters, such as neutron flux and spectrum, Tritium Breeding Ratio (TBR), nuclear power density, and energy multiplication factor. In the ceramic breeders at the saturated thickness, increasing the enrichment of 6Li reduces its share in the tritium production. Therefore, ceramic breeders typically use lower enriched Li from 30% to 60%. The investigation of neutronic analysis in the suggested geometry shows that using 60% 6Li in Li2TiO3 can yield acceptable TBR and energy deposition results, which would be economically feasible.

  • https://doi.org/10.1016/j.net.2021.02.016 인용 PDF KSCI

Effect of Si Content on the Phase Formation Behavior and Surface Properties of the Cr-Si-Al-N Coatings (Cr-Si-Al-N 코팅의 상형성 및 표면 물성에 미치는 Si 함량의 영향)

  • Choi, Seon-A;Kim, Hyung-Sun;Kim, Seong-Won;Lee, Sungmin;Kim, Hyung-Tae;Oh, Yoon-Suk
    • Journal of the Korean institute of surface engineering
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    • v.49 no.6
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    • pp.580-586
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    • 2016

  • Cr-Si-Al-N coating with different Si content were deposited by hybrid physical vapor deposition (PVD) method consisting of unbalanced magnetron (UBM) sputtering and arc ion plating (AIP). The deposition temperature was $300^{\circ}C$, and the gas ratio of $Ar/N_2$ were 9:1. The CrSi alloy and aluminum targets used for arc ion plating and sputtering process, respectively. Si content of the CrSi alloy targets were varied with 1 at%, 5 at%, and 10 at%. The phase analysis, composition and microstructural analysis performed using x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) including energy dispersive spectroscopy (EDS), respectively. All of the coatings grown with textured CrN phase (200) plane. The thickness of the Cr-Si-Al-N films were measured about $2{\mu}m$. The friction coefficient and removal rate of films were measured by a ball-on-disk test under 20N load. The friction coefficient of all samples were 0.6 ~ 0.8. Among all of the samples, the removal rate of CrSiAlN (10 at% Si) film shows the lowest values, $4.827{\times}10^{-12}mm^3/Nm$. As increasing of Si contents of the CrSiAlN coatings, the hardness and elastic modulus of CrSiAlN coatings were increased. The morphology and composition of wear track of the films was examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy, respectively. The surface energy of the films were obtained by measuring of contact angle of water drop. Among all of the samples, the CrSiAlN (10 at% Si) films shows the highest value of the surface energy, 41 N/m.

  • https://doi.org/10.5695/JKISE.2016.49.6.580 인용 PDF KSCI