• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.276-276
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• 2010

본 논문에서는 나노하이브리드 방법으로 제조된 변성 폴리이드계 나노하이브리드 절연코팅의 표면 굴곡특성을 비교 연구하였다. CS로 나노하이브리드화된 수지의 코팅표면의 표면거칠기를 AFM 으로 분석하여 그 변화를 비교하였다. CS로 처리된 나노하이브리드 코팅면의 경우 기초수지의 코팅면과 비교하여 기저재료와 상관없이 표면 거칠기는 현저히 줄어드는 경향을 나타내었다. 이는 20nm 이하의 균일한 CS입자가 균일하게 분산되어 수지 내에 자리하므로 기저물질의 거칠기를 보완하는 역할을 하기 때문으로 분석된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.4-5
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• 2021

In this study, in the coating-sheet composite waterproofing method, a specimen was formed to prevent the transmission of the no-node tensile stress occurring under the junction between sheets by forming an insulating structure when the junction was formed, and to compare the effect of preventing breakage with the existing common junction. For this, tensile performance evaluation was conducted. As a result of the evaluation, it was confirmed that it exhibited higher tensile strength compared to the existing joint and at the same time exhibited a large width of displacement characteristics, and thus, had an effect of preventing breakage.

• 한국태양에너지학회 논문집
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• 제23권4호
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• pp.63-70
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• 2003

It is very important to improve the insulation performance of curtain wall anchoring unit since it is composed of materials with high thermal conductivity, such as aluminium, steel and so on. This study aims to evaluate the heating energy performance and economical efficiency of various alternatives which are different in position and material of insulation. As results, alternative of inserting the urethane washer & pad and coating the anchoring unit with urethane foam can improve the heating energy performance and L.C.C(Life Cycle Cost) by 6.33% and 0.95%, respectively, as compared with the existing case.

• 한국전기전자재료학회논문지
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• 제29권12호
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• pp.829-834
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• 2016

Coil specimens were prepared by continuous coating on a copper wire with flexible PAI (polyamideimide) and PAI/nanosilica (5 wt%) varnish and thermally aged at 150, 200 and $250^{\circ}C$ for 5, 10 and 15 days, respectively. AC insulation breakdown voltage was investigated under inverter surge condition at 60 Hz and 1,000 Hz and insulation breakdown voltage decreased with increasing aging temperature and aging time at each 60 and 1,000 Hz.

• 한국초전도ㆍ저온공학회논문지
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• 제21권4호
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• pp.44-47
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• 2019

This paper is a study of recovery under load process of superconducting fault current limiter (SFCL). SFCL consists of five parallel-connected high-temperature superconductor (HTS) tapes additionally stabilized by stainless tape. Previously, HTS was heated by current pulse to simulate a short circuit in a power grid. During the cooling period, the current amplitude decreased to 23% or less of HTS critical current value, which is the simulation of network re-switching. When HTS with a polymer coating is cooled, temperature gradient on thermal insulation layer occurs, that prevents a boiling crisis and improves the heat sink into liquid nitrogen. Two samples are coated with a 30 ㎛ and 50 ㎛ polylactide (PLA) layers, reference sample has no polymer coating on it. Samples with a polymer coating show 3-5 times faster cooling than the reference one.

• 한국태양에너지학회 논문집
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• 제33권6호
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• pp.47-53
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• 2013

In order to reduce the energy consumption of the building, much effort is being made. The problems are that excessive solar radiation in summer and the heat loss in winter by the increase of window area. To prevent this problems, government limited the window area ratio or the performance of windows in new buildings. In order to reduce energy consumption of the existing buildings, the window film insulation is spotlight because the window film insulation was simple to installation. This study confirmed the performance of the window film insulation and affect to heating & cooling load of buildings. The impact of the window film insulation coating was confirmed by experiment. And this study confirmed the annual heating & cooling load by simulation. As a results, the surface temperature of coated window was higher than the surface temperature of existing window. The window film insulation was increased surface temperature of window. And this study confirmed that the increased surface temperature was slightly affected the room air temperature through experiment of the insulation box. The results of the heating and cooling load by simulation, this study confirmed that the case of coated window film insulation decreased cooling load in summer and increased heating load in winter. Also the annual total heating & cooling load was increased a little in the case of coated the window film insulation.

• Composites Research
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• 제33권3호
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• pp.101-107
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• 2020

본 논문에서는 탄화규소로 코팅된 탄소-탄소복합재료의 단열 특성을 고찰하였다. 탄소-탄소 복합재료 상에 탄화규소를 화학증착법(CVD)법으로 코팅하였다. 먼저 탄화규소로 코팅한 복합재와 코팅되지 않은 복합재에 대해, 공기 중에서 1350℃의 온도를 급작스럽게 부가하였을 때의 단열특성을 서로 비교하는 연구를 수행하였다. 또한 본 연구에서는 최대 1700℃ 및 2000℃의 온도에 복합재의 표면을 노출시키는 고온 버너실험을 수행하였다. 버너실험 전, 후의 무게를 측정하여 무게변화를 고찰하였다. 고온 버너실험 후 탄소-탄소 복합재 및 탄화규소로 코팅된 복합재의 손상여부를 비교, 고찰하였다. 그 결과 2000℃의 온도에 노출 시 탄화규소 코팅재에서 박리, 균열, 공동 등의 결함손상들이 발견되었으나, 고온으로부터 탄소-탄소 복합재를 보호하는데 효과적이었다.

• 전기학회논문지
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• 제65권10호
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• pp.1721-1726
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• 2016

4-types of coils were prepared by coating with polyamideimide (PAI) organic/inorganic hybrid. One type was made with original PAI vanish and the other 3-types were made of double layers, that was to say, high flexural PAI layer and high anti-corona PAI/nanosilica (15 wt%) layer. Drying temperature (T/D) were $220^{\circ}C$, $240^{\circ}C$, and $260^{\circ}C$, respectively and rectangular type coil for high-voltage rotating machine was used. DC and AC electrical breakdown tests were carried out in order to study the insulation properties according to T/D temperature and coil curvature (5, 15, and $25mm{\Phi}$). As the curvature increased, electrical breakdown voltage decreased and as T/D temperature decreased, electrical breakdown voltage increased.

• 한국분말재료학회지
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• 제28권3호
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• pp.233-238
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• 2021

Iron-based amorphous powder attracts increasing attention because of its excellent soft magnetic properties and low iron loss at high frequencies. The development of an insulating layer on the surface of the amorphous soft magnetic powder is important for minimizing the eddy current loss and enhancing the energy efficiency of high-frequency devices by further increasing the electrical resistivity of the cores. In this study, a hybrid insulating coating layer is investigated to compensate for the limitations of monolithic organic or inorganic coating layers. Fe₂O₃ nanoparticles are added to the flexible silicon-based epoxy layer to prevent magnetic dilution; in addition TiO₂ nanoparticles are added to enhance the mechanical durability of the coating layer. In the hybrid coating layer with optimal composition, the decrease in magnetic permeability and saturation magnetization is suppressed.

• 한국자기학회지
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• 제17권6호
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• pp.226-231
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• 2007

나노결정질 비정질 리본 표면에 졸-겔법에 의해 제조된 $TiO_2$ 및 $SiO_2$ 졸을 딥 코팅법을 이용하여 절연막을 형성시킴으로써 전기 비저항의 증가를 통한 고주파 손실을 제어하고자 하였다. 졸-겔법에 의한 슬러리 제조에서, 금속 알콕사이드의 혼합조건 및 절연층 형성용 슬러리의 제조조건을 확립하였고, 비정질 합금 리본 표면에 균일하고 우수한 점착력을 가지는 절연층을 형성시킬 수 있었다. 그리고 표면 절연층이 형성된 나노 결정질 합금 재료를 이용하여 제조한 자심재료는 전기 비저항의 증가로 인해 코어 손실을 약 40% 이상 감소시킬 수 있었다. 또한 표면 절연층을 형성시킨 자심재료를 이용하여 제조한 비접촉식 커플러는 코어 손실의 감소로 인해 삽입손실의 감소 효과가 나타났으며, 삽입손실의 감소효과는 주파수 증가에 따라 증가하였다.