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CO/CO_2혼합 gas를 이용한 산화텅스텐(WO_3) 환원-탄화 반응에 관한 연구
박영효,이종대,박노국,이태진 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.1
The reduction-carburization of tungsten oxide(WO_3) with CO/CO_2 mixtures was studied. The reduction rate was increased with the concentration of CO. The final products at 1100℃ were WC(CO concentration: 90∼100 vol%), W (CO concentration: 85 vol%) and WO_2 (C0 concentration: 70 vol%). For the CO concentration of 100 vol%, the general reaction routes were WO_3 → W_20O_58 → W_18O_49 → WC (reaction temperature: 600℃), WO_3 → W_20O_58 → W_18O_49 → WO_2 → WC (reaction temperature: 600∼800℃) and WO_3 → W_20O_58 → W_18O_49 → WO_2 → W → WC (reaction temperature: +900℃).
(Bi_2O_3)_0.73(CaO)_0.27 세라믹 산소이온전도체의 저온에서의 전기전도 특성
李晟齊,盧鎭孝,白鉉德 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-
Low temperature characteristics of ionic conduction in (Bi_2O_3)_0.73(CaO)_0.27 ceramics were investigated by ac impedance analysis. In the 200 to 500℃ temperature range grain boundary effect was not separated in the impedance plane. The speciments with larger grain size exhibited higher electrical conductivity and lower activation energy than deternined to be 101 kJ/mol, which was very close to the reported value, 106 kJ/mol. At 300℃ and lower temperatures conductivity curve bent toward higher conductivity, as was reported in the some other ion conducrors. The conductivity showed aging effect at temperatures lower than 350℃, but conductivity decrease was not significant.
이종대,이종욱,박노국,박영효,이태진 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1
The recovery of Cobalt(Co) and Tungsten Carbide(WC) from refractory scrap using electrolysis in an acid solution is studied. The method of electrochemical decomposition is a simple and economical process. The most important factor in the process of electrochemical decomposition is the component and concentration of electrolyte. The results show that the decomposition yield in sulfuric acid is better than other acid. This method is applicable for industrial process, because the decomposition yield is increased as scrap weight.
WO_3의 환원-탄화에 있어서 Zeolite NaX, HX, KX의 특성에 따른 영향
이동활,이종대,박영효,박노국,이태진 한국공업화학회 2003 응용화학 Vol.7 No.1
The effect of the Zeolite HX,NaX, and KH prepared by ion-exchange method, on the reduction-carburization of WO_3 was studied This study was performed at thetemperature range from 300℃ to 735 ℃ with CO gas. The produced gas, CO_2, was analyzed by mass spectroscopt The addition of the Zeolite HX, NaX,and KX into WO_3 increased the efficiency of the reduction-carburization of WO_3 and Zeolite HX with the strongest acidity was the most effective on redution-carburization among them. The Zeolite HX, NaX, and KX improved the oxygen mobility of WO_3 and the acidity of the Zeolite was directly related to the increasing efficiency of reduction-carbuization of WO_3.
No, Hyo Jin,Jang, Han-Na,Jin Cho, You,Lee, Ju-Yeon Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of polymer science Part A, Polymer chemist Vol.48 No.5
<P>A novel Y-type poly[iminocarbonyloxyethyl-5-methyl-4-{2-thiazolylazo-4-(1,2,2-tricyanovinyl)}resorcinoxyethyloxycarbonylimino-(3,3′-dimethoxy-4,4′-biphenylene)] 4 containing 5-methyl-4-{5-(1,2,2-tricyanovinyl)-2-thiazolylazo}resorcinoxy groups as nonlinear optical (NLO) chromophores, which constitute part of the polymer backbone, was prepared and characterized. Polyurethane 4 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. It showed a thermal stability up to 250 °C in thermogravimetric analysis thermogram and the glass-transition temperature (T<SUB>g</SUB>) obtained from differential scanning calorimetry thermogram was around 118 °C. The second harmonic generation coefficient (d<SUB>33</SUB>) of poled polymer films at 1560 nm fundamental wavelength was around 8.43 × 10<SUP>−9</SUP> esu. The dipole alignment exhibited a thermal stability even at 12 °C higher than T<SUB>g</SUB>, and there was no SHG decay below 130 °C due to the partial main-chain character of the polymer structure, which is acceptable for NLO device applications. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 1166–1172, 2010</P> <B>Graphic Abstract</B> <P>A new Y-type polyurethane 4 containing 5-methyl-4-{5-(1,2,2-tricyanovinyl)-2-thiazolylazo}resorcinoxy groups as NLO chromophores was prepared. The resulting polyurethane 4 has a thermal stability up to 250 °C with T<SUB>g</SUB> value around 118 °C. The SHG coefficient (d<SUB>33</SUB>) of poled polymer film at 1560 nm fundamental wavelength is around 8.43 × 10<SUP>−9</SUP> esu. The polymer exhibits a SHG thermal stability even at 12 °C higher than T<SUB>g</SUB>, and there is no SHG decay below 130 °C. This enhanced thermal stability of optical nonlinearity stems from the stabilization of dipole alignment of the NLO chromophores, which are part of the polymer main chain. <img src='wiley_img/0887624X-2010-48-5-POLA23875-gra001.gif' alt='wiley_img/0887624X-2010-48-5-POLA23875-gra001'> </P>
Hyo Jin No,You Jin Cho,Ju-Yeon Lee 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.2
A novel T-type polyester 7 containing 1-(2,5-dioxyphenyl)-2-{5-(1,2,2-tricyanovinyl)-2-thienyl}ethenes as nonlinear optical (NLO) chromophores, which are part of the polymer backbone, was prepared and characterized. Polyester 7 is soluble in common organic solvents such as dimethylsulfoxide and N,N-dimethylformamide. It showed a thermal stability up to 300 oC in thermogravimetric analysis thermogram and the glass-transition temperature (Tg) obtained from differential scanning calorimetry thermogram was around 113 oC. The second harmonic generation (SHG) coefficient (d33) of poled polymer films at 1,560 nm fundamental wavelength was around 1.85 pm/V. The dipole alignment exhibits a greater thermal stability even at 10 oC higher than Tg, and there is no SHG decay below 125 oC due to the partial mainchain character of the polymer structure, which is acceptable for nonlinear optical device applications.
No, Hyo-Jin,Cho, You-Jin,Lee, Ju-Yeon Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.2
A novel T-type polyester 7 containing 1-(2,5-dioxyphenyl)-2-{5-(1,2,2-tricyanovinyl)-2-thienyl}ethenes as nonlinear optical (NLO) chromophores, which are part of the polymer backbone, was prepared and characterized. Polyester 7 is soluble in common organic solvents such as dimethylsulfoxide and N,N-dimethylformamide. It showed a thermal stability up to $300^{\circ}C$ in thermogravimetric analysis thermogram and the glass-transition temperature ($T_g$) obtained from differential scanning calorimetry thermogram was around $113^{\circ}C$. The second harmonic generation (SHG) coefficient ($d_{33}$) of poled polymer films at 1,560 nm fundamental wavelength was around 1.85 pm/V. The dipole alignment exhibits a greater thermal stability even at $10^{\circ}C$ higher than $T_g$, and there is no SHG decay below $125^{\circ}C$ due to the partial mainchain character of the polymer structure, which is acceptable for nonlinear optical device applications.