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Experiments were carried out to investigate the effects of various casting methods and ESR, together with the addition of 2% nickel and 1% tin on the structure and wear properties of Cu-Pb alloy. The results obtained are as follows; 1) Inter-rod spacing of lead in ESR ingot was inversely proportional to the square root of solidification rate. 2) Wear resistivity of ESR ingot was superior to that by sand castings or chill castings. 3) Wear mechanism of Cu-Pb alloy seemed to be metallic and melting wear, no oxidizing wear was appreciable. Therefore, wear amount increased with increasing sliding speed.
The Government of the Republic of Korea has established an annual goal of 200,000 tons for domestic steel production. In spite of such a production project, the building up of the iron industry on the basis of the domestic mineral resources and conditions prevailing in the country faces a number of obstacles from the technical point of view. The Government, therefore, has repeated joint discussions with Korean technicians and representatives of the Government authorities concerned for the solution of the prevailing difficulties. In the meantime, in march 1956, Mr. W. S. Riu who is Managing-Director of the Daihan Heavy Industry Corporation was instructed to proceed west Germany, entrusting with a study of the adoptable iron and steel making process on the basis of the domestic materials. In addition, In may 1956, the government invited prof Lu¨th of Aachen University to ask his opinion for the possibilities of building up an iron industry in our country. Prof. Ku¨th submitted his findings in a report ofter conducted field surveys. He proposed to erect 3 electric pig iron furnaces with a daily capacity of 150 to 170 tons each in Mookho, and Stu¨rgelberg process with 50 tons capacity, he argued, might be adequate so for as the inchon plant was concerned. In the steel making process, he recommended to erect 3open-hearth furnaces of 50 to 60 ton capacity each, which vtilige the surplus gas from the electric pig-iron furnaces as fuel. For his recommendation, however, I have expressed my opinion on the college paper that the electric reducing furnace and Stu¨rzelberg process would not suitable in our country because of its higher processing cost and deficiency of electric power. I submitted that the blast furnace process might be adopted successfully if the production of artificial coke by domestic anthracite has been materialized, however, in the existing circumstances being not yet aceomplished the form coke test, the DEMAG-Humboldt process would be the most suitable method as the right advantage in our country, and concerning the steel making process it is benificial to adopt the duplex process-the combined Bessener and basic open-hearth process-which promote fuel economy by shortening the purification time and makes the steel maker independent of the steel serap. Subsequently, in May 1957, I received a report from Mr. W. S. Riu who had returned home from west Germany. He proposed a blast furnace process using artificial coke on the basis of his tests for the production of blast furnace coke from domestic anthracite. On the other hand, he recommended an oxygen-blown converter process as the steel production method. His observation and recommendation in connection with developing an iron and steel industry in Korea is so favorable and practicable that I should like to introduce his suggestions to our students and civilian technicians and, added to this, would give my own impressions.
Reduction of coke mixed magnetite ore pellets containing alumina and/or lime has been carried out in a fixed bed with coke powder in the temperature range of 1,100-1,250℃. Degree of metallization of the reduced pellets was obtained from the chemical analysis, and volume change of the reduced pellets was evaluated by measuring pellet diameter before and after reduction. Phase change during the reduction was also investigated by microscopic observation. The results obtained are summurized as follows. (1) As the Al₂O ₃content increases, degree of metallization of the ore pellets decreases and shrinkage of the reduced pellets also decreases. (2) Addition of 5% CaO to the 5% Al₂O ₃ pellets improves the degree of metallization and increases shrinkage of the reduced pellets, especially within the temperature range of 1,200-1,250℃. In the case of 10% CaO addition to the same pellets, however, both degree of metallization and shrinkage decrease. (3) CaO addition to the 10% Al₂O ₃ pellets showed the similar effect to that of 5% Al₂O ₃ pellets on the degree of metallization and shrinkage, showing no conspicuous effect of lime addition. (4) While Al₂O ₃ in the pellets is inhibitive to the reducibility as well as agglomeration, CaO is promotive to the above properties.
Applications of chromium diffusion coating on nickel and iron were studied by chemical vapour deposition(CVD) process. Effects of various treating conditions such as HCl and H₂flow rate, time, temperatute, and carbon content of iron were investigated with separate two chambers; vapourizing and reaction chambers. Weight increase of iron was not noticeable compared with nickel, since both exchange and reducing reaction were occured in the former. When nickel and iron is charged in reaction chamber simultaneously, nickel is effectively coated, while iron is attacked by HCl generated by reducing reaction. Less weight increase with higher carbon content of iron was resulted, since the active site for adsorption of reactant was decreased with higher carbon steel.