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김수식 대한금속재료학회(대한금속학회) 1971 대한금속·재료학회지 Vol.9 No.1
Ilmenite를 木炭과 混合하여 鹽素가스로 鹽素化 할 경우 良好한 收率로서 四鹽化티타늄을 얻을수 있는 好適條件에 關하여 實驗檢討한 結果, 다음과 같다. Ilmenite 및 木炭의 粒度를 各各 -200 mesh 및 100∼200mesh, 團鑛의 크기 6∼10mesh, Ilmenite와 木炭의 混合重量比 1:0.6, 鹽素가스流量 750㏄./min, 鹽素化溫度 800℃가 적당하다. 以上과 같은 條件하에서 40分間 鹽素化시킨 結果 99% 以上의 티타늄이 鹽素化 되였다. The optimum condition for recovering titanium from Korean ilmenite by chlorination process was studied as a function of particle size of ilmenite and charcoal, ratio of charcoal to ilmenite, size of briquette, chlorine flow rate, chlorinating temperature and chlorinating time. It was found that more than 99 percent of titanium was chlorinated when 6-8 mesh briquette made from 1 part of -200 mesh ilmenite and 0.6 part of 100-200 mesh charcoal, was decomposed with chlorine of 750 ㏄./min. at 800℃ for 40 minutes.
김수식,김한삼 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.9
To obtain fundamental informations for fine tungsten carbide powders, the preparation of fine tungsten carbide by vapor phase reaction of WCl_6-CCl₄-H₂ system has been carried out in the temperature range of 800-1300℃. The effects of reaction conditions on particle size and morphology of tungsten carbide powders have been investigated by utilizing X-ray diffraction, SEM and TEM techniques. The content of WC increased remarkably with increasing the reaction temperature and the maximum content was about 97% at 1100℃ in the condition of the flow rate of Ar gas 200㎖/min, H₂ gas 100㎖/min and CCl₄ gas 40㎖/min. The particle size of the reation products obtained at 1100℃ was about 0.05㎛ and the shape of WC was spherical. The particle size decreased linearly with increasing reation temperature. Also the crystallite size increased gradually with increasing reaction temperature.
김수식,김한삼 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.7
To obtain fundamental informations for fine tungsten carbide powders, the preparation of fine tungsten carbide by vapor phase reaction of WCl_6-C₂H₄-H₂ system has been carried out in the temperature range of 800-1300℃ The effects of reaction conditions on particle size and morphology of tungsten carbide powders have been investigated by utilizing X-ray diffraction, SEM and TEM techniques. The content of WC increased remarkably with increasing the reaction temperature and the maximum content was about 95% at 1100℃ in the condition of the flow rate of argon and H₂ gas 200㎖/min respectively and C₂H₄, gas 15㎖/min. The particle size of the reaction products obtained at 1100℃ is about 0.007㎛ and the shape of WC is spherical. The particle size decrease linearly with increasing reaction temperature. On the other hand, the agglomerate particle size increase linearly with increasing temperature. The lattice parameters a and c increase gradually with increasing reaction temperature.
김수식,김한삼 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.6
Ta obtain fundamental informations for fine tungsten carbide powders, the preparation of fine tungsten carbide by vapor phase reaction of WCI_6-CH₄,-H₂ system has been carried out in the temperature range of 1000-1400℃. The effects of reaction conditions on particle size and morphology of tungsten carbide powders have been investigated by utilizing X-ray diffraction, SEM and TEM technique . The synthesis temperature of only WC powders is above 1350℃ in the condition of the flow rate of argon and Hz gas is 220㎖/min respectively and CH₄, gas 40㎖/min. 'The particle size of the reaction products obtained at 1400℃ is about 0.02㎛ and the shape of WC is spherical. Temperature dependence of the particle size is weak and the lattice parameters a and c decrease gradually with increasing reaction temperature. Also the crystallite size increases gradually with increasing reaction temperature.
플라즈마용사에 의한 ZrO2-MgO 피복층의 열처리효과에 관한 연구
김수식,김한삼,정병근 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.6
The plasma spray process was used to deposit. coatings of ZrO₂- MgO powders onto SM45C substrate, and the characteristics of as-deposited and heat. treated coatings have been investigated. Particulary, the variations of microstructure, porosity, wear resistance, thermal shock resistance and thermal barrier in ZrO₂- MgO coatings after heat treatment under lower pressure have been investigated. It was found that coatings of ZrO₂- MgO is consist of layered structure with thickness 2-3㎛, and with grain size of 0.O6㎛. The amount of prosity was increased with increased spray distance, and the lowest amount of porosity was obtained at the arc current of 450A, and at the spray distance of 50mm. After heat treatment, the amount of porosity was found to be decreased, and wear resistance, microhardness and thermal shock resistance were improved. However, the thermal barrier were decreased.