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Al / SiCp 복합재료에서 보강재 표면의 금속 피복층이 젖음성과 계면 강도에 미치는 영향
이경구,이도재 ( Kyung Ku Lee,Doh Jae Lee ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.4
N/A Effects of metal coating treatment on SiC particle on wetting behavior and interfacial strength were studied. Experimental variables are included types of coated metallic films such as Cu and Ni-P, and temperatures of heat-treatment under vacuum. The experimental results concerning wetting phenomena of liquid Al on SiC, showed that coating treatment of metallic film on SiC particles remarkably improves the wetting behavior of liquid Al on SiC, especially in the case of Ni-P coating. The interfacial strength of Al/SiC composites made of coated SiC plate was higher than that of the composite with non-coated SiC plate although the coating treatment was not perfect.
Squeeze Casting 법에 의해 제조된 A356 / coated SiC 복합재료의 미세조직과 기계적 특성에 관한 연구
이경구,이도재 ( Kyung Ku Lee,Doh Jae Lee ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.5
N/A Influence of interfacial structure between matrix and particle in A356/coated SiC composite fabricated by squeeze casting method was studied. Experimental variables are types of coated metallic film on SiC particles such as Cu, Ni-P, and applied pressure for squeeze casting. It was found that coating treatment on SiC particles improves the wetting of liquid A356 alloy on SiC particles. SiC particle distribution is very homogeneous in A356 matrix alloy which is fabricated by squeeze casting. Analysing the surface morphology of fractured A356/coated SiC, it was concluded that metallic thin film by coating treatment on SiC particle improves the interfacial bonding between particle and matrix, and so does on mechanical properties such as tensile strength. However, there was on significant difference in hardness between those composite made of as-received SiC particle and coated SiC particle.
이경구,윤동주,기회봉,강창석,이도재 ( Kyung Ku Lee,Dong Ju Yoon,Whe Bong Ghi,Chang Sug Kang,Doh Jae Lee ) 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.3
N/A An oxidation behavior of 304 and 316 stainless steels were studied in dry air. After solution treatment, specimens were polished up to 1㎛ A1₂O₃ grade and then subjected to oxidation treatment in dry air at 800℃∼1200℃. The oxidation behavior between matrix and oxide scale was analyzed with SEM, EDS and XRD. When oxidation treatment was conducted at 1200℃, large thickness of Fe oxide scale was formed on top of surface and fine (Cr,Fe)₂O₃oxide film was formed below it. Cr rich zone existed at interface between metal and (Cr,Fe)₂O₃oxide layer, and it was believed that this zone acted as obstacle to oxidation. Most of Ni was detected at the interface between metal and (Cr,Fe)₂O₃and also detected at the interface between Fe₂O₃and (Cr,Fe)₂O₃.
가압주조법에 의해 제조된 AC4C Al / coated SiC 복합재료의 마모특성에 관한 연구
이경구,이도재 ( Kyung Ku Lee,Doh Jae Lee ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.4
N/A Effects of SiC particle on wear resistance of AC4C Al/SiC composite were studied. Experimental variables included were types of metallic coatings such as Cu and Ni-P, and volume fraction of SiC particle in composite. The results of wear test showed that the wear resistance of AC4C Al/SiC composite is increased linearly with volume fraction of SiC particles. In the range of our experimental conditions, there is no significant difference in wear resistance between the type of pretreatment for coating on SiC particles used for composite specimens the as-received SiC reinforced and coated SiC reinforced composite. Wear debries generated during wear test are identified as Al from matrix alloy of specimen, and iron oxide from steel block which is counter part of abrasion test. Severe subsurface plastic deformation is observed at the regions close to the wear surface, and the surface region were work hardened.
이경구,이상목,홍준표 ( Kyung Ku Lee,Sang Mok Lee,Chun Pyo Hong ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.4
N/A Polycrystalline Al-Cu ribbons were produced by planar flow casting(PFC). Solidification behavior and microstructual changes of the ribbons have been investigated as a function of ribbon thickness and processing parameters. The solidification front velocity, V varies within the ribbon, decreasing with increasing the distance, S from the wheel-contact surface, as V=17.6S^(-1). In Al-4.5wt%Cu alloy, rapid decrease in solidification velocity toward the free surface causes a change in solidification morphology from planar to cellular, and finally, to dendritic. The length and inclination of columnar grains solidified with planar front were related to the wheel velocity. The transition from particulate degenerate eutectic structure to regular lamellar eutectic structure was observed to be caused by a difference of the relative growth velocites of α-Al and θ during solidification in the Al-Cu eutectic alloy.
이경구(Lee Kyung-Ku) 역사학회 2012 역사학보 Vol.0 No.213
A common paradigm underpins both autochthonous development theory, which aims at establishing a concept of developmental history by picking out aspects of Western modernity in Korean history and Korean conceptual history, which tries to settle the modern Western order in Korea by accepting Western concepts. This paradigm, however, is now facing criticism that it will end up intensifying the dichotomy of ‘West vs. East’. The conceptual history of Silhak(實學) however can let us move beyond this paradigm. Silhak as a concept demonstrating autochthonous development, has changed in usage and meaning. Traditionally, it mainly referred to the study of Confucian classics in preparation for Gwageo(科擧), or the academic study of Confucianism during the Joseon Dynasty period. After having undergone a transition of meaning in the 19th century, it came to have its current meaning after the 1960s. The intent of the change in meaning was to connect a new academic inclination in the 18th century under the mottos of ‘institutional approach to government(經世致用)’ and ‘economic enrichment(利用厚生)’ with modernity. It was also to combine pre-modern content with modern form. This combination is applicable to the embryonic theory of capitalism, another main axis of the autochthonous development theory. Once free from the paradigm of Western-style capitalism, we can examine the embryo of Eastern-style modernity on a broad scale.
특집 근대전환기 개념의 운동과 변주 : 19세기 말∼20세기 초 한,중,일 삼국의 실학 개념
이경구 ( Kyung Ku Lee ) 한림과학원 2015 개념과 소통 Vol.0 No.15
19세기 말에서 20세기 초 사이의 실학 개념은 유학의 맥락에서 벗어나기 시작했다는 점에서 이전과 다르고, 특정한 역사 용어로 고정되지 않았다는 점에서 현재와도 다르다. 당시 실학을 학문의 보편 정신으로 간주하여 서양문물 수용의 근거로 삼은 것은 주목할 만하다. 이 같은 궤적은 한·중·일 삼국이 대체로 공유하였으나 차이도 있었다. 식민지였던 한국은 ‘비중국/친민족, 반일본/친근대’의 지향을 역사에서 실증하여 독립을 향한 운동력을 확보하려 했다. 실학은 그 점에서 꽤나 만족스러운 개념이었다. 중국은 실학을 주로 학문혹은 학자의 가치 지향과 관련해 주목하였지, 역사상의 특정 학파로 고정하지는 않았다. 일본의 실학 개념은 또 다른 유형이다. 실용·과학의 의미가 강조되어 인문학 전반에 대한 반대로 쓰이거나 고대동양의 이상적 이미지를 실학으로 차용하여 일본 중심의 대동아 건설에 활용하였다. The concept of Silhak around the turn of the 20th century was distinct from its previous usage, in that it had begun to move beyond the context of Confucianism, and also from its current usage, because it was not yet established as a specific historical term. Most notably, at this time Silhak was regarded as representing the universal spirit of learning, and so it became the basis for accepting Western civilization. This change was evident in all three countries, though there were some significant differences among them. Korea, then a Japanese colony, tried to build momentum for its independence movement through the historical verification of an identity which was non-Chinese but pro-Korean, and anti-Japanese but pro-modern; Silhak functioned quite satisfactorily for this purpose. China considered Silhak mainly in terms of its value in encouraging an orientation toward learning or scholarship, and Silhak was not established in China as a specific school. In Japan, the concept of Silhak was different again: it was used as a term which contrasted with the humanities as a whole, and particular emphasis was placed on its practical and scientific aspects. The Japanese also took Silhak as a background upon which an idealized image of the ancient Orient could be projected, as a conceptual framework to support their idea of building a Greater East Asia.