• 제목/요약/키워드: Ceramic deposition

검색결과 735건 처리시간 0.045초

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
    • 한국표면공학회:학술대회논문집
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    • 한국표면공학회 2012년도 춘계학술발표회 논문집
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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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    • 제53권8호
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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

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

  • 최선아;김형순;김성원;;김형태;오윤석
    • 한국표면공학회지
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    • 제49권6호
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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

Aerosol deposition Method for Fabrication of Nano Crystal Ceramic Layer - Novel ceramics coating with collision of fine powder at room temperature -

  • Akedo Jun
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.29-54
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    • 2005

  • Consolidation of ceramic particles at room temperature. Reduction of crystallite size and formation of nano-crystalline. Applicable to Integrate functionalceramic materials with metals and Si structure and to fabricate MEMS devises

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