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"치오요소용액으로부터 활성탄에 대한 은의 흡착에 관한 연구"
원덕환,조통래,원창환 忠南大學校 産業技術硏究所 1989 산업기술연구논문집 Vol.4 No.2
Adsorption rates of silver thiourea on activated carbon were determined as a function of initial silver concentration. PH of solution, carbon amount, flow rate and adsorption temperature. Results thus obtained revealed that the adsorption of complex ion(Ag(CS(NH₂)₂)₃)on activated carbon follows generally to the charge collection theory.
Luminescence Enhancement by Ba in SrTiO3:Pr, Al Red Phosphor for Field Emission Displays
원창환,강승열,송윤호,Jong-Eun Lee,원형일,Kwang-Bok Kim,Kyoung-Wan Koo 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.11
The luminescence properties of Sr1-xBaxTiO3:Pr, Al red phosphor for Field Emission Displays (FEDs) have been investigated in powders prepared though solid-state reactions. Sr1-xBaxTiO3:Pr, Al red phosphors indicate a higher luminescent intensity, and have been found to have potential for field emission displays. The addition of Ba increased the luminescence intensity at 617 nm by up to 30%. Ba ions are effective in producing the energy transfers from host-to-activator in 4f-5d transitions.
원창환,정중채,주성민,고석권 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.9
The purpose of the current research work is to develop a technology for preparing pure AlNi using SHS process. The preparation of AlNi intermetallic compounds was affected by the mole ratio, compaction pressure, and particle size. Combustion temperature is decreased with increasing the compaction pressure and the particle size of aluminum. In the course of combustion reaction, high densification of products was directly attained by inducing pressure and forming simultaneously.
원창환,조통래,서동희,권호영 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.2
Chlorination behaviours of tungsten oxide (WO₃) were investigated by means of a thermogravimetric analysis. The rate of chlorination was increased with increasing the mixed ratio of carbon as a reducing agent. the flow. rate of chlorine gas, reaction temperature, and the amount of calcium fluoride as an additive. It was found that experimental results fit well Valensi equation, 1-2/3R-(1-R)^(2/3) = Kt and the rate of chlorination is controlled by a diffusion process, the activation energy of which is 26.0 KJ/mole. Discussion of the chlorination mechanism is also given in the text.
원창환,손용운,안성권 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.11
Due to the great hardness, hard nitrides have been extensively used in cutting tools and wear-resistant parts. The nitride also shows excellent high-temperature strength and good corrosion resistance. The purpose of this research is to develop the technology for the synthesis of titanium nitride by the reaction of titanium metal and nitrogen. The titanium nitride(TiN_x) can be manufactured by the several methods. In the present work, bulk TiN_x has been synthesized by the reaction of titanium and nitrogen followed by homogenizing annealing. The homogeneous TiN_(x≥1.0) can be obtained at 1000℃ with the lattice parameter and specific gravity of 0.424㎚ and 5.39g/㎤, respectively similar to that of pure grade TiN.
산화물 (TiO2) 로부터 자전연소반응에 의한 TiC 분말제조
원창환,강복석,천병선 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.5
The experimental results for the fabrication of TiC powder from TiO₂by self-combustion reaction are summerized as follows; 1) The mole ratio of Mg was the greatest affecting factor in the reaction and the mole ratio of C, particle size of Mg, mixing times affected the reaction as well. 2) MgO and Mg were completely removed by leaching in the 20% HCl solution. 3) The TiC powders had a spherical shape and the particle size was 0.3-0.4 microns with a narrow distribution. 4) Purity of manufactured TiC powder was about 99.925 weight percent.
원창환,정중채,윤기석 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.2
Fe-Al intermetallic compounds were manufactured by using the field-activated combustion synthesis process. Effects of chemical composition(Fe:Al=1:2, 1:1, 21), compaction pressure(150. 250, 350㎫) and electrical resistance on the reaction were investigated. As the molar ratio of Al, compaction pressure and electric field increased, the combustion temperature and velocity increased. The structure and composition of reaction products were characterized with X-ray, SEM and EDXS to determinethe. As a results, final product was influenced with the composition of reactants, but was not influenced with compression presure.