http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 발행기관 : Pohang University of Science and Technology (검색결과 1,192 건)
-
-
-
-
-
-
-
Tafwidli, Fahmi Pohang Science and Technology University, Graduate 2017 국내석사
Cu and Sn are known as typical tramp elements which cause degradation of steel properties during hot processing such as hot shortness and crack occurrence. Cu and Sn are impurities which always remained in steel as long as steel scrap is used as Fe sources. Many researchers have tried to remove Cu and Sn from steel during the production of the steel, but there are still no successful technologies developed/commercialized yet. In the present author’s group, series of researches have been conducted in order to understand evaporation of Cu and Sn when they present as dissolved elements in liquid iron. It was found that Cu and Sn could be removed as pure gas components in forms of Cu(g) and Sn(g), and associated compound with S in forms of CuS(g) and SnS(g), Unfortunately the previous research only conducted evaporation at 1600°C and C-saturated condition so it is necessary to extend the research at different temperature and different C concentration. In the present investigation, kinetic study of Cu and Sn evaporation was elaborated as chemical reaction at the surface is the rate controlling step assisted by thermodynamic modeling. The experiment was conducted at different temperature (1240°C-1500°C) and at different C concentration by employing semi-levitation technique. Ar-4%H2 was flown over alloys of Fe-Cu-C-S and Fe-Sn-C-S through silica chamber with flow rate 1 Lmin-1. Cu and Sn composition were analyzed using Induce Couple Plasma whereas C and S composition were analyzed using LECO combustion method. The experimental results showed that decrease of temperature decreased the rate of evaporation and increase of C concentration increased the evaporation rate caused by change of activity. By modifying a kinetic model developed previously in the present authors’ group, and introducing effect of temperature to thermodynamic and physical properties of the liquid system, it is shown that the newly developed model could explain the newly obtained experimental data obtained in the present study and the previous study by Jung and Kang in the author’s research group. Apparent activation energy of Cu and Sn evaporation were also obtained. The newly developed model is used to simulate the removal of tramp elements in scrap melting process.
-
-
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
