• 소성∙가공
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• 제18권5호
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• pp.401-409
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• 2009

The change of the thermal properties of exothermic and insulating materials with the mixing condition of raw materials which is the most important factor for exothermic & insulating materials was investigated by using the evaluation system of the thermal properties of exothermic and insulating materials. In this study, the effect of the thermal properties of the exothermic & insulating materials such as exothermic properties, endothermic properties, insulating properties, maximum temperature of molten metal, ignition time of exothermic & insulating materials and temperature recovery time on the mixing ratio of reductant and oxidant, types of reductant, and particle sizes of reductants was examined. It could be expected to design the mixing condition of raw materials for various exothermic and insulating materials.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 춘계학술대회 논문집
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• pp.118-126
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• 2009

The change of the thermal properties of exothermic & insulating materials with mixing condition of raw materials which is the most important factor for exothermic & insulating materials was investigated by using the evaluation system of the thermal properties of exothermic & insulating materials. In this study, the effect of the thermal properties of the exothermic & insulating materials such as exothermic properties, endothermic properties, insulating properties, maximum temperature of molten metal, ignition time of exothermic & insulating materials and temperature recovery time on the mixing ratio of reductant and oxidant, types of reductant, and particle sizes of reductants was examined. It could be expected to design the mixing condition of raw materials for various exothermic & insulating materials.

• 소성∙가공
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• 제17권5호
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• pp.356-363
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• 2008

An evaluation system of the thermal properties of exothermic & insulating materials was developed. By measuring the power supply of the induction furnace, the thermal property of exothermic & insulating materials could be evaluated with high reproducibility at elevated temperature of molten steel. The thermal properties of exothermic & insulating materials were affected by mixing condition of raw materials. The effect of main components of exothermic & insulating materials such as metallic aluminum and $Fe_2O_3$ powder on the exothermic and insulating properties was examined. It could be expected to design and develop various exothermic & insulating materials by means of the evaluation system of the thermal properties.

• 한국화재소방학회논문지
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• 제17권1호
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• pp.76-84
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• 2003

본 연구는 산업현장에서 단열재로 .사용되고 있는 폴리스티렌 폼, 폴리우레탄 폼, 폴리에틸렌 폼과 같은 플라스틱 단열재의 화재특성을 구명하고자 하였다. 플라스틱 단열재의 화재특성은 ISO 5660에 따라 콘칼로리미터 시험을 수행하였다. 사용된 실험재료는 국내에서 생산되는 상업용 플라스틱 단열재를 사용하였고 그들의 조성은 제조자에 의해 밝혀지지 않았다. 연구 결과플라스틱 단열재의 열방출율은 재료의 밀도와 열플럭스의 증가에 따라 증가하였다. 플라스틱 단열재 중 폴리에틸렌 폼이 최대열방출율 및 평균열방출율이 가장 크게 나타났고, 열플럭스 및 밀도의 증가에 따른 최대열방출율의 증가율도 가장 큰 것으로 나타났다. 플라스틱 단열재에 의한 화재예방을 위해 제품의 종류 및 열플럭스의 크기에 따른 열방출 평가 기준을 제시하였다.

• 한국화재소방학회논문지
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• 제21권3호
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• pp.97-103
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• 2007

본 실험은 오염된 절연재료의 트래킹 특성을 연구하였다. 오염된 절연재료의 트래킹에 의한 절연파괴 특성 분석은 IEC 60112를 통하여 수행하였다. 연구결과, 오염된 절연재료의 트래킹 특성은 다음과 같다. (a) 오염된 절연재료의 경우 정상시료 보다 비교트래킹지수(comparative tracking index, CTI)가 낮게 나타났다. (b) 오염된 절연재료의 최초 탄화흔 발생시간 및 탄화도전로 형성 시간이 정상시료 보다 빠르게 나타났다.

• Elastomers and Composites
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• 제46권1호
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• pp.29-36
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• 2011

단열재(thermal insulating materials)는 외부의 온도에 저항하여 내부의 열 손실이나 외부로의 열 방출을 최소화 하기 위한 재료로 열의 전도, 복사, 대류 현상을 최소화 하여 기계의 효율을 높일 수 있는 재료를 말한다. 이러한 단열재는 건축 산업을 비롯하여 자동차, 우주 항공 및 석유화학 등 수 많은 분야에 다양하게 사용되고 있다. 특히 실리카 에어로젤은 어떤 고체보다 낮은 열전도율로 인해 열차단제로 많이 사용되어 왔다. 하지만 낮은 기계적 강도로 인해 기존의 소재를 대체하는데 있어 문제점이 있다. 본고에서는 단열재에 대해 소개하고 최근 각광을 받고 있는 열 차단소재로의 실리카 에어로젤에 대해 다룬다.

• 공업화학
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• 제17권4호
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• pp.357-360
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• 2006

본 연구에서는 단열재로서의 페놀수지(PF) 발포폼의 물성과 응용가능성을 검토하였다. 실험결과 페놀수지 발포폼의 밀도는 $0.030g/cm^3$를 나타내었고, 열전도율은 $0.026kcal/m.h.^{\circ}C$를 나타내었다. 또한 페놀수지 발포폼은 $500^{\circ}C$로 1 h 동안 열을 가했을 경우 약 71.7 wt%가 휘발되었다. 그리고 페놀수지 발포폼의 화학구조는 단열재로서의 중요 물성인 closed cell 구조형태를 갖는 것으로 분석되었다. 따라서 제조된 페놀수지 발포폼은 단열소재로서의 우수한 물성을 갖는 것으로 확인되었다.

• 한국소음진동공학회논문집
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• 제19권4호
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• pp.378-385
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• 2009

In establishing silent environment such as automobile and industrial instrument, the roles of the insulating materials are critical. The proper and effective positioning of insulating materials is essential in the field of noise as well as in designing silent automobile. In this paper, we proposed the systematic and efficient scheme for optimizing complete automotive interiors for noise control. In order to attain this purpose, following analysis has been carried out: First, measuring the Biot parameters of insulating materials and the transmission loss with reflecting the appropriate arrangement of insulating materials has been experimented. In addition, we made comparison among transmission loss by the tools of analysis and verification, experimental value under consideration of various situations of automobile and analysis by the SEA.

• 한국전기전자재료학회논문지
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• 제25권10호
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• pp.791-797
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• 2012

Mineral insulating oils are an important insulating materials in oil-filled transformer. However, the mineral oil is the cause of the environmental problem. The vegetable oils are substitutes for mineral oil because of its biodegradability characteristic. As large size and high rating of the transformer increases, the losses increase at a faster rate. So insulating oil is forced circulation in the oil-filled transformer by using oil pumps. The flow electrification occurs when insulating oil was forced to be circulated. To check the flow electrification, had conducted experiments varying factors. As a result, the streaming electrification could see the changes according to flow velocity, oil temperature and insulation materials.

• 대한안전경영과학회지
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• 제20권4호
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• pp.15-19
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• 2018

The purpose of this study is to enhance heat insulation effect and to decrease fire hazard by attaching aluminum foil to expanded polystyrene, which is mainly used for insulating materials, to have fire retardant. The result of the test confirmed that the insulating materials, expanded polystyrene of $10kg/m^3$ and $14kg/m^3$ of density attached aluminum foil on both sides, showed 12%, 14% of improved heat transfer coefficient respectively compared to existing expanded polystyrene of the same density. Besides, they met all the standards for the testing of heat release and gas hazard. On the other hand, the one made of general expanded polystyrene could not meet the standards of the heat release test and the gas hazard test.