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THE EFFECT OF SI-RICH LAYER COATING ON U-MO VS. AL INTERDIFFUSION
류호진,JAE SOON PARK,JONG MAN PARK,CHANG KYU KIM 한국원자력학회 2011 Nuclear Engineering and Technology Vol.43 No.2
Si-rich-layer-coated U-7 wt%Mo plates were prepared in order to evaluate the diffusion barrier performance of the Si-richlayer in U-Mo vs. Al interdiffusion. Pure Si powder was used for coating the U-Mo plates by annealing at 900 ºCfor 1 h undervacuum of approximately 1 Pa. Si-rich layers containing more than 60 at% of Si were formed on U-7 wt%Mo plates. Diffusioncouple tests were conducted in a muffle furnace at 560-600 ºCunder vacuum using Si-rich-layer-coated U-Mo plates andpure Al plates. Diffusion couple tests using uncoated U-Mo plates and Al-(0, 2 or 5 wt%)Si plates were also conducted forcomparison. Si-rich-layer coatings were more effective in suppressing the interaction during diffusion couple tests betweencoated U-Mo plate and Al, when compared with U-Mo vs. Al-Si diffusion couples, since only small amounts of Al in thecoating could be found after the diffusion couple tests. Si-rich-layer-coated U-7wt%Mo particles were also prepared usingthe same technique for U-7 wt%Mo plates to observe the microsturctures of the coated particles.
류호진,박희동 ( Hojin Ryu,Hee Dong Park ) 한국공업화학회 1997 공업화학 Vol.8 No.4
본 연구에서는 고상반응에 의하여 Tm^(3+)를 도핑한 YTa_7O_(19)를 제조하고, 이들에 대한 빛발광 특성을 조사하였다. 시료의 특성평가에는 XRD, SEM 및 PL을 사용하였다. 359nm의 여기하에서, Tm^(3+)를 도핑한 YTa_7O_(19)의 발광 스팩트럼은 455nm에서 피크를 나타내며, 매우 좁은 발광밴드를 갖는 청색 형광체가 얻어졌다. YTa_7O_(19)의 최대발광강도는 Tm^(3+)의 농도를 0.12몰 도핑하였을 때 얻어졌으며, 이는 발광강도의 농도퀀칭과 관련이 있다. Samples of YTa_7O_(19) doped with Tm^(3+) were prepared using the solid state reaction method to investigate their photoluminescence characteristics. The samples were identified by XRD and SEM, and the optical measurement was also carried out. Under 359 nm excitation, YTa_7O_(19) doped with Tm^(3+) exhibited a narrow-band blue emission, at about 455 nm. The maximum emission intensity was obtained at YTa_7O_(19) doped with 0.12 mole Tm^(3+). This revealed the concentration quenching of emission intensity.
Kaolinite-Aluminum Trihydroxide의 혼합물의 혼합분쇄효과 및 Mullite의 생성에 미치는 영향
류호진 한국세라믹학회 1997 한국세라믹학회지 Vol.34 No.2
본 논문은 kaolinite(Al2O3.2SiO2.2H2O)-aluminum trihydroxide(Al(OH3) 혼합물을 소결전에 planetary ball mill을 사용하여 건식 중에서 혼합분쇄한 후, 이 혼합물을 사용하여 소결하는 동안에 mullite의 생성거동을 연구한 것이다. 혼합물의 입자크기 감소는 분쇄 초기에 현저하였으며, 분쇄기간이 증가함에 따라 미립자들이 응집하는 현상을 보였다. 혼합물의 결정구조는 planetary ball milling에 의한 혼합분쇄에 따라 쉽게 비정질화되었으며, 비정질화되는 정도는 분쇄시간이 증가함에 따라 증가하였다. Kaolinite의 초기 분순물로 존재했던 anatase를 제외한 mullite상만이 상대적으로 낮은 소결온도인 1523K에서 혼합분쇄한 혼합물의 소결체에서 나타났다. 한편, 분쇄하지 않은 혼합물의 소결체의 경우는 이 온도에서 mullite 상 이외에 corundum, cristobalite, Al-Si spinel상이 공존하는 형태로 나타났다. 따라서, 혼합분쇄처리는 출발원료의 미소 규모에 있어서 균일혼합 및 분산을 촉진시키며, 또한 결정구조변화에 따른 열분해온도의 변화일으켜, 상대적으로 낮은 온도에서 고순도의 mullite를 직접 생성하는데 효과적이였다. The present paper describes the effect of dry mixed grinding on kaolinite-aluminum trihydroxide mixture with a planetary ball mill before sintering and its influence on mullite formation during sintering. The size reduction of the mixture is market in the early stage of grinding and the obtained fine particles agglomerate subsequently with an increase of grinding time. The crystal structure of the mixture is collapsed easily into an amorphous one by planetary ball milling, of which amount increases with an increase of grinding time. Only mullite phase except for anatase as an inherent impurity in kaolinite appeared in the sintered body of the mixtures with mixed grinding as relatively lower temperature 1523K, while corundum, cristobalite, and Al-Si spinel phases, besides mullite were formed in the sintered body of the mixture without mixed grinding. Therefore, the mixed grinding treatment is very effective to improve the homogeneous mixing and disp-ersion of the mixture of raw materials on a micro scale and to decrease the thermal decomposition tem-perature by crystal structure change of them so as to obatin direct preparation of mullite with high purity at relatively low temperature.
Tm<sup>3+</sup> 도핑에 따른 YTa<sub>7</sub>O<sub>19</sub>의 형광특성
류호진,박희동,Ryu, Hojin,Park, Hee-Dong 한국공업화학회 1997 공업화학 Vol.8 No.4
본 연구에서는 고상반응에 의하여 $Tm^{3+}$를 도핑한 $YTa_7O_{19}$를 제조하고, 이들에 대한 빛발광 특성을 조사하였다. 시료의 특성평가에는 XRD, SEM 및 PL을 사용하였다. 359 nm의 여기하에서, $Tm^{3+}$를 도핑한 $YTa_7O_{19}$의 발광 스팩트럼은 455 nm에서 피크를 나타내며, 매우 좁은 발광밴드를 갖는 청색 형광체가 얻어졌다. $YTa_7O_{19}$의 최대발광강도는 $Tm^{3+}$의 농도를 0.12몰 도핑하였을 때 얻어졌으며, 이는 발광강도의 농도퀀칭과 관련이 있다. Samples of $YTa_7O_{19}$ doped with $Tm^{3+}$ were prepared using the solid state reaction method to investigate their photoluminescence characteristics. The samples were identified by XRD and SEM, and the optical measurement was also carried out. Under 359 nm excitation, $YTa_7O_{19}$ doped with $Tm^{3+}$ exhibited a narrow-band blue emission, at about 455 nm. The maximum emission intensity was obtained at $YTa_7O_{19}$ doped with 0.12 mole $Tm^{3+}$. This revealed the concentration quenching of emission intensity.
액중 전기선 폭발법에 의한 Ni-free Fe계 나노 합금분말의 제조: 1. 합금 wire의 직경 및 인가 전압의 영향
류호진,이용희,손광욱,공영민,김진천,김병기,윤중열,Ryu, Ho-Jin,Lee, Yong-Heui,Son, Kwang-Ug,Kong, Young-Min,Kim, Jin-Chun,Kim, Byoung-Kee,Yun, Jung-Yeul 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.2
This study investigated the effect of wire diameter and applied voltage on the fabrication of Ni-free Fe-based alloy nano powders by employing the PWE (pulsed wire evaporation) in liquid, for high temperature oxidation-resistant metallic porous body for high temperature particulate matter (or soot) filter system. Three different diameter (0.1, 0.2, and 0.3 mm) of alloy wire and various applied voltages from 0.5 to 3.0 kV were main variables in PWE process, while X-ray diffraction (XRD), field emission scanning microscope (FE-SEM), and transmission electron microscope (TEM) were used to investigate the characteristics of the Fe-Cr-Al nano powders. It was controlled the number of explosion events, since evaporated and condensed nano-particles were coalesced to micron-sized secondary particles, when exceeded to the specific number of explosion events, which were not suitable for metallic porous body preparation. As the diameter of alloy wire increased, the voltage for electrical explosion increased and the size of primary particle decreased.
Influence of Fuel-matrix Interaction on the Breakaway Swelling of U-Mo Dispersion Fuel in Al
류호진,김연수 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.2
In order to advance understanding of the breakaway swelling behavior of U-Mo/Al dispersion fuel under a high-powerirradiation condition, the effects of fuel-matrix interaction on the fuel performance of U-Mo/Al dispersion fuel wereinvestigated. Fission gas release into large interfacial pores between interaction layers and the Al matrix was analyzed usingboth mechanistic models and observations of the post-irradiation examination results of U-Mo dispersion fuels. Using themodel predictions, advantageous fuel design parameters are recommended to prevent breakaway swelling