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Thermit법에 의한 저탄소 Fe-Mo, Fe-W의 제조 조건에 관한 연구
呂運寬 홍익대학교 산업기술연구소 1994 産業技術 Vol.4 No.-
The mixing ratio of reducing agents and reasenable operation condition of making low carbon Fe-Mo and Fe-W were examined. In addition hear of formation on the Thermit reaction and hear capacity of products were inverstigated. Compared with hear of formation when reduction Fe-Mo and Fe-W with Al that with Si is only 45% and 43% and hear capacity of reduced products from Si is more then that of Al. Reduction velocity is controlled by amount of Al. Si and CaO.
呂運寬 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-
In order to find a solution to make it uniform the current distribution situation of chromium plating solution we have found the following results; which to use and inspect a divided cathode panel in Hull cell. When using the current shield it is more effective to position the current shield closely by the place which requires to shield the current. When using the auxiliarly anode it is more effective to place the current shield near the place of low current density. Current distribution by the bipolar electrode can not be controlled without causing bipolar phenomena in Sargent chromium plating solution. The current distribution in Hull cell is rather uniform than that in copper sulfate plating solution. We have found that the reason for the throwing power's weakness is caused by the poor current efficiency and poor covering power in the place of low current density.
呂運寬 홍익대학교 산업기술연구소 1995 産業技術 Vol.5 No.-
The state of current distribution was compared and examined using the cathode electrode divided into 5 sections in Hull cell and typical tank for the study of high through copper sulfate plating bath. Deviation of current distribution of high through copper sulfate plating bath in Hull cell is uniform by the ratio 2.0:1 of high current density section and low current density section and that of bright copper sulfate plating bath is 5 times as big as in the ratio of 9.6.1 but that of both plating baths in typical tank are found to be uniform. The effect of uniformity of current distribution remarkably appeared according to increase of concentration of sulfuric acid but scarcely appeared by changing concentraion of copper sulfate.
呂運寬,鄭光龍 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-
This study was examined on the effect of complexing agents for the throwing power, current efficiency and morphology of electrodeposited layer in the neutral zinc plating bath containing ZnCl_2(40g/l), KCI(100g/l), H_3Bo_3(60g/l), and complexing agent (90g/l) In terms of enlarging the bright range of plating EDTA(4Na salt) added bath was the best and sodium gluconate added bath was also good. However sodium gluconate added bath has a better result for the throwing power and current efficiency than EDTA added bath has. Throwing power is inclined to decrease slightly in both baths according to a rise in temperature and increase according to the current density and pH. In both bath, current efficiency decreases according to a rise current density and decreases slightly according to a rise in pH but increases according to a rise in temperature. Cross sectional micrograph of electrodeposited layer appeared not in the lamellar or columnar texture but in the very fine testure. The morphology of elecrodeposited surface was almost the same as obtained from Zine cyanide pl