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
- 저자 : 趙煥從 (검색결과 26 건)
- 무료
- 기관 내 무료
- 유료
-
염소공법을 위한 Ilmenite 와 Ti 슬랙 불순물의 예비환원
조환종,박창선,반봉찬 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.6
Behavior of the reduction of iron oxide in ilmenite and titanium slags by various solid carbons was investigated in the temperature range of 1000℃ l150℃. A laboratory scale rotary kiln for the prereduction was employed to study the effects of reduction time and temperature, using various carbons as reducing agents of the prereduction process. Maximum metallization (95%) of FeO in ilmenite was achieved at about 1100℃. The reduction process of ilmenite including newly confirmed phase (pseudorutile) could be expressed in four elementary reduction stages, and also the phase transformation of ilmenite and titanium slags during the reduction process was investigated with the aid of X-ray diffraction analysis and electronmicroscopy.
-
調煥從 조선대학교 생산기술연구소 1981 生産技術硏究 Vol.1981 No.-
In the migration of moisture condensed layer in green sand mold it is natural to consider that the pressure gradient should be present since steam moves in the porous media. On the other hand, steam permeability has been discussed as resisting the movement of steam. The relation between steam pressure distribution and migration of moisture condensed layer in green sand mold was examined, and the behavier of gas flow was discussed. The gas pessure was measured with a semiconducter-mini pressure transduser of diffusion type. The gas pressure in the usual mold was within the region of a few milimeters and afew tens of milimeters Aq. Anda authors have already reported, the relation between pressure, temperature and moisture in different zone of green sand mold is as follows. That is, at some point in the actual mold too, first, the temperature and moisture increase and then the pressure rises as soon as the moisture is saturated. There was a satsfactory agreement between the calculated value of steam pressure obtained by analysis using steam permeability and the measured value obtained in the pouring test.
-
조환종 朝鮮大學校 工科大學 1972 論文集 Vol.1 No.-
약 80여종 이상의 금속원소의 융점을 살펴보면 가장 높은 것이 W으로 3410℃이고 가장 낮은 것이 Hg으로 -38.9℃이다. 이 같은 금속 원소 중 저융점 금속이라고 쓰는 1족의 금속이 우리들의 생활에 널리 쓰여지고 있다. 그러면 여기에는 어느 융점으로부터 저융점 금속이라고 일컬을 것이냐 하는 문제점이다. 그런데 이것은 어떠한 과학적인 근거를 기초로 하여 엄밀히 구별할 수 있는 한계선이 없고 다만 지금까지 관례적으로 사용하여 왔던 실용 금속 Pb, Sn, Bi, Cd 등과 이들의 합금을 가리켜 명명하여 사용 한 것 뿐이다. 근래 어느곳에서는 융점이 상당히 낮은 금속 Sb, Zn 등도 저융점 금속이라고 사용하는 곳도 있지만 금후로는 융점 327 ℃이하의 금속 원소를 저융점 금속이라고 일컫으므로 이들을 본 필자는 저융점 금속에서 제외 하겠다.
-
趙煥從 朝鮮大學校 動力資源硏究所 1981 動力資源硏究所誌 Vol.3 No.1
Many studies on the chromium plating from high concentration bath have been developed and so we have much known about it. But it has been litlle presented to economize CrO_(3) using low concentration bath. This study was performed to observe and investigate the surface appearance of chromium plating from low concentration CrO_(3) solution by a microscope. The following results were obtained. 1) The cracks appeared clearly on the surface of the surface of the chromium plating from CrO_(3) concentration 50 g/L and appropriate concentration of catalyzers. 2) From the change of bath temperature and current density in low concentration chromium plating solution, the surface appearences and the number of cracks of chromium plating seemed to be almost the same as those of the high concentration for common use. 3) The number of cracks of plating from low concentration, CrO_(3) : H_(2)SO_(4) : Na_(2)SiF_(6)=100:1:1 was the same as that of plating from sargent bath, the number of cracks was a half comparing with the fluoride silicon bath, and it was one-sixth with micro crack bath. 4) The cracks were microscopic under the low temperature and the low current density within the bright range, and under the high temperature and the high current density they became sparse.
-
趙煥從,高濟晩 조선대학교 생산기술연구소 1978 生産技術硏究 Vol.1978 No.-
Gas-Nitriding은 窒化物形成元素를 多量 含有한 鋼에만 限定되었었다. 그러나 球狀黑鉛鑄鐵도 Gas- Nitriding이 가능하다. 球狀黑鉛鑄鐵은 Gas-Nitriding에 依하여 充分한 表面硬化를 얻었다. 가장 적당한 Gas-Nitriding 條件 및 Nitriding Mechanism에 對한 本實驗結果는 다음과 같다. 1. 球狀黑鉛鑄鐵의 가장 적당한 Gas-Nitriding에서 얻은 表面硬度 및 窒化層은 各各 Hv700∼800,O.2∼O.4mm였다. 2. 溫度 및 加熱時間이 增加함에 따라試片의 팽창에서 일어나는 Strain은 최대 O.12mm에 達했다. 3. 室化에 따라 硬化에 미치는 미치는 原因은 Si_(3)N_(4)dml 折出에 起因된 것으로 생각된다.
-
조환종,이길홍,백승남,이효복,추현식,이현규,강조원,박창선,고제만 조선대학교 생산기술연구소 1983 生産技術硏究 Vol.1983 No.-
After Quenching C_(r)ㅡM_(o) steel, the Variations of tensile strength and hardness with the tempering temperature and the effects of tempering temperature and tufftrided treatment on fatigue strength were investigated. The results obtained in this study were as follows : 1. Tensile strength and hardness decreased as the tempering temperature increased, but elongation increased slightly. 2. Fatigue strength increased as the tempering temperature decreased, therefore equations of 3), 5), 6), were effected between fatigue limit and vickers hardness and proportional relation between fatigue strength and hardness even above Hv 400 was effected. 3. Fatigue strength of the specimens tufftrided was higher than that of specimen ternpered at 600℃ after quenching, but lower than that of specimens tempered at 150℃, 300℃ and 450℃.
-
趙煥從,李在鉉,潘奉贊 조선대학교 생산기술연구소 1983 生産技術硏究 Vol.1983 No.-
The methods of purication of Crude nickel Sulfate were studied in the aim of its effective Separation from it's impurities of Fe, Cu, Using basicity separation by means of Ca (OH)₂and NH_(4)OH, Fe hydroxide was precipitated after the Oxidation of Fe^(++) by activated Carbon and MnO₂in the temp. 80℃ for I hr. Solvent extraction of Fe, Cu, Ni with Versatic acid was also used as the Secondary purification step. The purity and recovery of Ni Sulfate (NiSO_(4)6H_(2)O) are 99% (equivalant to chemicals) and 90% through the two purification methods.
-
-
-
金得琪,趙煥從 朝鮮大學校 工科大學 1973 論文集 Vol.2 No.-
This research aims to develop lower-grade iron ores by the improvement of dressing technique and recovering by-products of iron ores. Today our country is using more iron. But on the contrary most of all iron deposits and iron ores are so poor that we are urgent to improve dressing technique and facilities. From these viewpoints, I studied on the improvement of dressing technique and dressing facilies for the rise in grade of poor iron ores. And I investigated the method getting rid of the harmful elements in the process of smelting.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
