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강계명,Kang, Kae-Myung 한국재료학회 2008 한국재료학회지 Vol.18 No.12
For development of a human body model for electric shock, electroconductive paints with carbon black as a filler material were developed. The characteristics of the volume resistivities of thin films fabricated using the electroconductive paints were investigated as a function of the particle sizes and content of carbon black. With a carbon black particle size over $80\;{\mu}m$, agglomeration of carbon black powders was observed. The volume resistivity of the particles increased as the porosity increased and as the amount of carbon black decreased due to the agglomeration of carbon black powders. With a particle size of $4\;{\mu}m$ and $20\;{\mu}m$, agglomeration of carbon black powders was not observed and their porosities were measured as 0.86% and 1.12% with volume resistivities of $20\;{\Omega}{\cdot}cm$ and $80\;{\Omega}{\cdot}cm$ respectively. A carbon black particle size of less than $20\;{\mu}m$ is considered to be suitable as a type of electric-shock electroconductive paint for a human body model.
Al<sub>2</sub>O<sub>3</sub>/Cu 나노복합체 제조공정에 따른 미세조직 특성
강계명,오승탁,Kang, Kae-Myung,Oh, Sung-Tag 한국재료학회 2003 한국재료학회지 Vol.13 No.1
The microstructural characteristics of $Al_2$$O_3$/Cu composites hot-pressed at different temperatures for atmosphere switching from $H_2$to Ar have been studied. When the composite atmosphere was switched at $1000^{\circ}C$ it led to more homogeneous microstructure than when the atmosphere was switched at $1450^{\circ}C$. The strong sensitivity of Cu to atmosphere, especially the oxygen content in the atmosphere, was found to be responsible for the observed change, based upon the interfacial phenomena related to the formation of $CuAlO_2$. The practical implication of these results is that an optimum processing condition for the design of homogeneous microstructure and stable properties can be established.
강계명,박은수,심언덕,Kang, Kae-Myung,Park, Un-Su,Sim, Eon-Deok 한국재료학회 2002 한국재료학회지 Vol.12 No.8
The three-dimensional estimation on the depth and height of flaw by using the difference of radiographic contrast density was studied. First, the specimens having artificial flaws of various depths and heights were prepared and the radiographic testing was performed. The radiographic depth of flaw was investigated and estimated on the effect of the scattered radiation with the change of distance between flaw and film. The height of flaw was estimated from the radiographic test with the reference specimen. The radiographic contrast with flaw depth decreased with increasing the flaw depth. The scattered radiation increased with increasing flaw depth and varied with the location between flaw and film. However, in the case of flaw height, the contrast density increased with increasing flaw height. It is thought due to the change in volume generating the scattered radiation which reaches a film.
Cu-TiB<sub>2</sub> 복합재료의 기계적 성질에 미치는 TiB<sub>2</sub> 입자의 영향
강계명,최종운,Kang Kae-Myung,Choi Jong Un 한국재료학회 2004 한국재료학회지 Vol.14 No.1
The mechanical and electrical properties of $Cu-TiB_2$ composites prepared by hot extrusion and cold drawing according to the variation of $TiB_2$ contents and the size of $TiB_2$ particle have been studied. The experimental results showed that the electrical conductivity was decreased with increasing the $TiB_2$ content, and their tensile strength and hardness increased inversely. In the case of the same content of $TiB_2$ particle, the smaller $TiB_2$ particle, the higher their mechanical properties. The electrical conductivity of $Cu-TiB_2$ composites showed more than 70%IACS. Their yield strength and hardness were more than 120 MPa and HRB 60~70, respectively.
Replica법에 의한 X20CrMoV12.1강 용접부의 비파괴 평가
강계명,최종운,Kang Kae Myung,Choi Jong Un 한국재료학회 2004 한국재료학회지 Vol.14 No.1
In this study, the degree of creep damages on the weldment accelerated creep degradation was nondestructively evaluated by replica method. The frequency of creep cavities occurrence has been observed highly at the intercritical HAZ. The life fraction of weldment damaged by creep has shown from 0.25(damage grade: 2) to 0.75(damage grade: 4) when it reptured. The degree of creep damages is considered to be evaluated by the metallographic replica method which is one of nondestructive evaluation methods.
수소주입에 따른 590 MPa급 DP강 표면층의 미소경도와 조직특성
강계명,박재우,Kang, Kae-Myung,Park, Jae-Woo 한국재료학회 2010 한국재료학회지 Vol.20 No.11
High strength sheet steels for automobile are seriously compromised by hydrogen embrittlement. This issue has been continuously studied, but the field of interest, which lies between microstructural characteristics and hydrogen behavior with hydrogen charging, has not yet been thoroughly investigated. This study was done to investigate the behavior of hydrogen according to the hydrogen volume fraction on 590MPa grade DP steels, which are developed under hydrogen charging conditions as high strength sheet steels for automobiles. The penetration depths and the mechanical properties, according to charging conditions, were investigated through the distribution of micro-hardness and the microstructural observation of the subsurface zone. It was found that the amount of hydrogen trapping in 590MPa DP steels was related to the austenite volume fraction. It was confirmed that the distribution of micro-hardnesses according to the depth of the subsurface zone under the free surface showed the relationship of the depth of the hydrogen saturation between the charging conditions.
수소주입시킨 다상조직강의 Subsurface Zone 내 취성화 거동
강계명(Kae-Myung Kang),박재우(Jae-Woo Park),최종운(Jong-Un Choi) 한국표면공학회 2013 한국표면공학회지 Vol.46 No.1
In the present work, it was investigated a behavior of hydrogen embrittlement at the subsurface zones of 590 DP steels by using the micro-Vickers hardness test. The micro-Vickers hardnessess of DP steels were measured to evaluate the degree of embrittlement as the effective hardening depths of subsurface zones with hydrogen charging conditions. The results showed that the distributions of micro-Vickers hardness in width varied from maximum hardness 239.5 Hv to minimum hardness 174 Hv, while the depth of effective hardening layer at the subsurface zones of DP steels was from 320 ㎛ to 460 ㎛ with hydrogen charging conditions, respectively. It was proposed that the distribution of microhardness be used as the evaluation index of the degree of embrittlement. But the variations of martensite volume fractions were not affected along depth of hardening at the same changing time, hydrogen charging times were appeared as an effective factor of the degree of embrittlement. Therefore, the micro-Vickers hardness test is an attractive tool for evaluation of hydrogen embrittlement at the subsurface zones of these DP steels.
강계명(Kae-Myung Kang),최종운(Jong-Un Choi) 한국표면공학회 2007 한국표면공학회지 Vol.40 No.6
Relationships between the electrical resistivity and the growth characteristic of SnO₂ thin films were investigated. SnO₂ thin films with thickness from 64 ㎚ to 91 ㎚ were made by controlling the RF deposition energy from 80 to 150 W. These SnO₂ thin films were annealed at 200℃~700℃ temperature range of 100℃ interval in the O₂ gas condition. After annealing treatments, the microstructures of the SnO₂ thin films were changed mixed structure(amorphous & crystalline) to lamina columnar crystalline structure. Both the film thickness and the grain size were increased with increasing the local crystallization of SnO₂ microstructure of thin films by annealing treatment. Their electrical resistivity increased up to the annealing temperature of 400℃, and then slowly decreased.
강계명(Kae-Myung Kang),김유상(Yu-Sang Kim) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.6
Recently, it has been increasing for the eco-environment plating and surface treatment of eco-environment to decrease hazardous materials. Particular eco-environment can be applied to electronics or automotive parts of industry. In the case of mobile phone, if there were fired, the products bearing dye may be contaminated with the hazardous and wasted. we can obtain the original metal color by electro coloring by metal salt, get rid of hazardous gas, decrease the wasted sludges. Now, the industrial patent number is increasing in Korea, we can accomplish the development of green industry by supporting technical trend of the plating and surface treatment in eco-environment.