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환원확산법(還元擴散法)에 의한 TiFe 수소 흡장합금의 제조에 관한 기초적 연구
권호영,주전아수,소천수 한국산업안전학회 1993 한국안전학회지 Vol.8 No.2
For comparison, we used Ca and Mg as reducers to produce TiFe hydrogen stroage alloy from Fe and TiO₂by the Reduction-Diffusion process. The results obtained were as follow : ① Ca was found to be effective both for reduction and diffusion processes. Moreover, Ca oxide was easily removed in an NH₄Cl solution after the reaction. ② In the case of using Ca as a reducer, the Reduction-Diffusion process is considered to take place in the folling three steps: First. TiO₂is reduced to Ti by Ca over 1000℃. Second, the atomic Ti drifts in the Ca melt and meets Fe particles. Finally, the atomic Ti diffuses in to the Fe particles. ③ In the case of using Mg as a reducer, We found that the reduction reaction of TiO₂went well. But the reduced Ti scarcely diffused into Fe particles. This was probably because no Mg melt was formed due to the high vapor pressure of Mg.
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고체탄소에 (固體炭素) 의한 철의 침탄기구에 (浸炭機構) 대한 연구
권호영,조통래,강세선 ( Ho Young Kwon,Tong Rae Cho,Sei Sun Kang ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.3
N/A The experiment was carried out for the purpose of studying the carburization of pure iron ingot and sintered iron powder by solid carbon in the atmosphere of CO gas. The volocity of carburization was estimaed by the diffusion coefficient D calculated by carburization equation. The results obtained were as follow: 1. The higher the carburization temperature, carburization depth and carbon concentration were increased, and the melting zone which had 2.8∼3.4%C at the 3∼4㎜ from interface of carburization was formed at 1300℃. 2. The main caxburization mechanism of pure iron ingot and the sintered iron powder were proceeded by CO gas up to 1100℃, solid carbon over than 1300℃, respectively. 3. The main carburization mechanism of pure iron ingot at 1200℃ was proceeded by solid carbon, and sintered iron powder was proceeded bs CO gas, however, in case the reaction time, the carburization was proceeded by solid carbon over than 5hrs. 4. The diffusion coefficient D of carbon were 0.559×10^(-6)㎠.sec^(-1) at 1100℃, 0.237×10^(-6)㎠.sec^(-1) at 1200℃, 0.087×10^(-6)㎠.sec^(-1) at 1300℃, in case of pure iron ingot carburized. 5. The diffusion coefficient D of carbon were 0.124 ㎠.sec^(-1) at 1100℃, 0.102 ㎠.sec^(-1) at 1200℃, 0.480×10^(-6)㎠.sec^(-1) at 1300℃, in the case of sintered iron carburized at the pressuring 4ton/㎠.
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권호영,조통래,권혁무 한국기술사회 1987 技術士 Vol.20 No.4
The experiment was carried out for the purpose of studying the carburization of pure iron ingot and sintered iron powder by solid carbon in the atmosphere of $N_2$ gas. The velocity of carburization was estimated by the diffusion coefficient D calculated by carburization equation. The results obtained were as follows ; 1. The briqueted sample of iron fine powder which made by higher pressure, carburization depth and carbon concentration were increased as much, and pure iron shelved the maximum value. 2, The higher the carburization temperature, carburization depth and carbon concentration were increased, and the melting zone which had 3.0~3.3%C at the interface of carburization was formed at 130$0^{\circ}C$. As the pure iron ingot was carburized, the diffusion coefficient D of carbon were 0.211$\times$$10^{-6}$$\textrm{cm}^2$ㆍsec$^{-1}$ at 120$0^{\circ}C$ and 0.391$\times$$10^{-6}$$\textrm{cm}^2$ㆍsec$^{-1}$ at 130$0^{\circ}C$, respectively. 4. As the sintered iron powder was carburized at the pressure of 4 ton/$\textrm{cm}^2$, the diffusion coefficient of carbon were 0.157$\times$$10^{-6}$$\textrm{cm}^2$ㆍsec$^{-1}$ at 120$0^{\circ}C$ and 0.103$\times$$10^{-5}$$\textrm{cm}^2$ㆍsec$^{-1}$ at 130$0^{\circ}C$, respectively.
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권호영,이성일 한국산업안전학회 1991 한국안전학회지 Vol.6 No.3
The dielectric properties that effect to electric safety for unsaturated Polyester resin were studied over the temperature range of 30-40[℃] and the frequency range of 110~3 × 10^6 [㎐]. According to the results of the study, it has been observed that two kinds of dielectric losses in electric safety were existed by the molecular movement of C-H and OH group. When the radio of hardener was 1.5 [%], the characteristics of specimens were excellent in view of the electrical materical. In the range of measuring frequency the dielectric constants and the dielectric losses were 3.5∼5.5 and 10²∼10¹ respectly. The activation energy of loss spectrum in aspect of electric safety and the entropy appeared at the 30 [℃] were 33.4 [Kcal/mole] and 54.9 [㎈/mole-deg] respectly.
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권호영,임종호,강세선 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.5
표준시험편이란 재질, 형상, 치수 및 성능이 권위 있는 기관에 위해 검정된 국제적인 시험편을 말하며 이것은 탐상기의 특성시험 또는 감도조정, 시간축의 측정범위 조정에 사용된다. 그런데 이 표준시험편은 초음파탐상 결과에 아주 크게 영향을 미치는 하나의 변수로 ASTM 이나 JIS에서는 이들 표준시험편의 규격, 재질 및 성분 등을 엄격하게 규격화하고 있다. 그 이유는 이들 성질들이 감도와 분해능 및 재현성에 아주 큰 영향을 미치기 때문이다. 따라서 결함의 크기 및 치수를 정량화하고 재현성 있는 결과를 얻기 위해서는 엄격한 품질의 표준시험편이 요구되고 있다. 그러나 ASTM 또는 JIS등의 규격품들은 상당히 고가이며 시중에는 품질이 검증되지 않은 표준시험편들이 일부 사용되고 있는 실정에 있고 이들 시험편의 품질 및 사용 적합성을 재고하기 위하여 각종 규격에 비추어 보고, 규격품들과 비규격품의 각종 성질들을 비교하여 그 사용 안정성을 고찰하고자 하였다. 그 결과 비규격품들은 치수 및 성분에서 많은 문제점을 안고있으며 비규격품들을 검증없이 사용할 경우 피검물내의 결함의 위치나 크기 측정에 오차를 유발할 가능성을 확인하였다. Standard Test Block(STB) for UT(Ultrasonic Testing) is a block approved by authoritative for material, shape and quality. STB is used for characteristic tests, sensitivity calibration and control of the time base range of UT inspection devices. The material, size and chemical components of STB should be strictly controlled to meet the related standards such as ASTM and JIS because it has an effect upon sensitivity, resolution and reproductivity of UT. The STBs which are not approved are sometimes used because the qualified STBs are very expensive. So, the purpose of this study is to survey the characteristics, quality and usability of Non-Standardized Test Blocks. Non-Standardized Test Blacks did not meet the standard requirements in size or chemical components, and ultrasonic characteristics. Therefore if the Non-Standardized Test Blocks are used without being tested, it's likely to cause errors in detecting the location and measuring the size of the defects.
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