• Title/Summary/Keyword: Inorganic insulation

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Insulation Coating for non-oriented Silicon Steel Sheerts (무방향성 전기강판의 절연피막 코팅재)

  • 조남웅;장세기
    • Journal of the Korean institute of surface engineering
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    • v.30 no.6
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    • pp.382-390
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    • 1997
  • Good appearance of insulation coating is required for non-oriented silicon steel sheets, The property is influenced by both the chemical composition of coating solution and the species of resin. The composition of inorganic-organic coating was studied to obtain good surface quality for non-oriented silicon steel. The greenish degree of coating surface depended on $Cr^{3+}$ content in the coating layer, which was satisfied when chromate content was more than 54.60 wt. %, in the coating solution. The homogeneous pattern and roughness of the coating surface depended on spreading property of the resin. Surface appearance of the coating could be improved by using resin with good spreading property at the chemical composition of chromate 59.00 wt.%.. resin 34.23wt.%, and etyhylene glycol 6.67 wt.% without colloidal sillica.

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The Study of Energy-Efficient Insulation Continuity an Inorganic Insulation (무기 단열재를 이용한 에너지 효율 지속성 단열재 연구)

  • Lee, Jae-Seong;Jeon, Chan-Ki;Kim, Ju-Ho;Park, Jong-Pil
    • Proceedings of the Korean Society of Disaster Information Conference
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    • 2015.11a
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    • pp.166-167
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    • 2015
  • 단열재를 생산하는 회사에서는 대부분 유기단열재를 사용하고 있다. 커튼윌 시스템은 경제적이면서 성능이 우수하지만 불연성이지 않다. 따라서 근래에 안전사고가 많아지고 있어서 타지 않는 무기 단열재가 필요하다. 또한 안전과 단열효과 및 소비자가 요구하는 친환경적인 무기단열재가 필요하므로 불연성 무기단열재의 개발이 시급하다. 본 논문은 무기단열재의 문제인 흡수성을 실험하기 위하여 가습기를 이용하여 흡수성 실험을 하였고 경량골재인 펄라이트와 바인더를 섞고 흡수방지제로 처리한 샘플과 그렇지 않은 샘플의 흡수율을 측정하여 에너지 효율 지속성 단열재의 기술연구를 목표로 한다.

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A Study on Thermal Insulation Property and Thermal Crack Protection for Expanded Perlite Inorganic Composites (팽창진주암 무기복합재에서의 단열성능 및 열크랙 방지에 관한 연구)

  • Ahn, WonSool
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.5
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    • pp.3286-3291
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    • 2014
  • A study on the crack protection and thermal insulation properties of the expanded perlite inorganic composites was performed. Mixed expanded perlite with a water glass was stabilized for 24 hrs at room temperature in the mold and, thereafter, converted into a massive foamed body through complete drying process at $150^{\circ}C$. Aluminum phosphate and micron size mica powder were used as a reaction accelerator and a stabilizer for thermal crack, respectively. Especially, use of mica exhibited a remarkable effect on the protection of thermal crack at higher temperature over $500^{\circ}C$, and thermal conductivity of the composites was enhanced with higher perlite contents, showing ca. 0.09 W/mK for the sample of 100/200/10/1.5 water glass/perlite/mica/Al phosphate by weight. A severe dimensional deformation of the composite materials was observed over $600^{\circ}C$, however, showing a temperature limitation for a practical application. The facts were considered as the results from the glass transition temperature of the water glass, of which main component is sodium silicate.

Thermal Properties of DGEBHA/MDA/SN/zeolite System Degraded by Moisture Absorption

  • Kim, You-Jeong;Lee, Hong-Ki;Kim, Sang-Wook
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.479-482
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    • 1999
  • Cured epoxy resins are extensively used for the electrical insulation in high-voltage equipments. The bisphenol A-based epoxy resins lured with azine show, especially, good thermal properties and mechanical resistances. For the technical and economic reasons, varing amount of inorganic fillers are added to endow the required special properties. In the large generators and motors of power plants, epoxy insulation is disclosed to the harsh conditions like the superheated steam and abrupt temperature variation. Hygrothermal aging at elevated temperatures tends to induce degradation in epoxy resins. To predict the effect of this degradation in DGEBA/MDA/SN/zeolite system, we proceeded the forced moisture absorption experiment using the autoclave. The thermal properties of the untreated and treated specimens were analyzed by DSC and TGA under the nitrogen flowing condition. The moisture absorption results showed a weight increase during hygrothermal aging at 1207. At the initial aging period, the system leaded to more or less postcuring but more prolonged environmental aging leaded the discoloration of specimen and lowering the T$_{g}$./.

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Bending strength of GFRP for Insulator according to Winding Angle (전기절연물용 GFRP의 winding 각도에 따른 굽힘강도)

  • Park, Hoy-Yul;Kang, Dong-Pil;Ahn, Myeong-Sang;Lee, Tae-Joo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07a
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    • pp.429-432
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    • 2004
  • The demand for electric power keeps growing, and tends to be more effective. Polymer insulators have been manufactured for almost twenty years and the excellent insulation performance of polymer insulators is attractive. Polymeric materials are now widely used as a replacement for inorganic materials such as porcelain or glass for the outdoor insulation of high voltage insulation. GFRP has been used widely as a core materials for polymer insulators. This paper reports the mechanical properties of GFRP for insulators. The bending strength was simulated and evaluated according to the winding angle. The fiber orientation in GFRP has a great effect on the strength of GFRP because the strength of GFRP mainly depends on the strength of fiber. Results of simulated and evaluated strength of GFRP were compared each other. The simulated strength of GFRP rod was different from the evaluated strength. It was caused that the shear stress had a great effect on the strength of GFRP although the stress of parallel direction of GFRP was much higher.

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Electrical and Mechanical Properties of Epoxy/Heterogeneous Inorganic Composites Materials for the Application of Electric Power GIS Appliances (친환경 GIS용 전력기기의 적용을 위한 에폭시 이종무기물 복합재료의 전기적, 기계적 특성)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.12
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    • pp.1633-1640
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    • 2018
  • Epoxy resin is a polar thermosetting polymer that is widely employed in different branches of industry and everyday life, due to their stable physical and chemical properties. Of all the polymer materials currently being used in the electrical insulation industry, epoxy resin is the most widely used kind, chosen as the base polymer material in the present study. Composites were prepared according to the mixing ratio (MS: MA, 1: 9, 3: 7, 5: 5, 7: 3, 9: 1)of mixture for Heterogeneous Minerals(Micro Silica:MS, Micro Alumina:MA) (MS+MA). We have investigated for AC electrical insulation breakdown characteristics and the dielectric properties (permittivity, dielectric loss, and conductivity) with frequency changes. The electrical AC insulation breakdown performance was improved with the increase of the mixing ratio of MS according to heterogeneous mineral material mixture(MS+MA). As Dielectric properties, the dielectric constant and dielectric loss increased with decreasing frequency and decreased with increasing MS content ratio of heterogeneous mineral mixture. Tensile strength and flexural strength according to the mixing ratio (MS + MA) of epoxy / heterogeneous mineral mixture were studied by mechanical properties. The performance of mechanical tensile and flexural strength was significantly improved as the fill contents ratio of MS increased.

Reclamation of Inorganic wastes to Artificial Lightweight Aggregates

  • Chang, Hui-Lan;Liaw, Chin-Tson
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.565-570
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    • 2001
  • Annually, Taiwan generates approximately 2 million tons of inorganic wastes in the form of sludge, fly ash and slug. To increase the added value of waste and maintain the increasingly insufficient supply of natural gravel, large public construction projects account for this large demand each year. future architectural trends are leading towards high-rise buildings. In light of the above, Center for Environmental, Safety and Health Technology Development, Industrial Technology Research Institute has developed the technology of manufacturing cold-bonding, sintering and bloating types of lightweight aggregates with a specific gravity ranging between 0.7~1.7, water absorption rate < 30%. The lightweight aggregate verified by physical property tests can be used as a substitute for the natural aggregate, which generally appears in replacing gravel in concrete, soundproofing and heat insulation materials. Doing so would not only moderate waste disposal problems, but also achieve the goal of resource recovery.

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An Improved Density and Heat insulation of Light-weight Ceramic Insulator Using Cullet and Fly-ash (밀도 및 단열성능이 개선된 경량 세라믹 단열재의 물성)

  • Shin, Hyeon-Uk;Song, Hun;Chu, Yong-Sik;Lee, Jong-Kyu
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.90-91
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    • 2015
  • Heat insulator materials can be classified inorganic and organic. The organic material is due to toxic gas emission, when a fire occurs. And it has lower water resistance. The inorganic material is heavy and worse thermal performance than organic materials. In this study, cullet and fly ash were used as basic materials in order to secure a recycling technology of by-products which was mostly discarded and reclimed, and measure of physical properties of light-weight ceramic insulator.

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Studies on Incombustibility Improvement of EPDM-based Insulation with Al(OH)3 and Sb2O3 (EPDM계 내열재의 Al(OH)3와 Sb2O3 함량에 따른 난연 효과 연구)

  • Kim, Jinyong;Lim, Daehyun;Lee, Wonbok
    • Journal of Aerospace System Engineering
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    • v.7 no.4
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    • pp.36-41
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    • 2013
  • In order to improve incombustibility of EPDM(Ethylene propylene diene monomer)-based rubber, inorganic materials as $Al(OH)_3$ and $Sb_2O_3$ were added. The mechanical and thermal properties have been measured for vulcanized rubber loaded with different concentrations of $Al(OH)_3$ and $Sb_2O_3$. As inorganic material contents increases from 5phr to 30phr, the specific gravity and hardness increase while elongation at break decreases. This study performed incombustibility test and thermal analysis through TGA(Thermogravimetric Analyzer). As a results, incombustible and thermal properties of EPDM-based rubber were improved as $Al(OH)_3$ and $Sb_2O_3$ contents increase.

Surface Deterioration Phenomena in Polyethylene under Corona Discharge (Corona 방전에 의한 Polyethylene의 표면열화현상)

  • 성영권;송진수;민남기
    • 전기의세계
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    • v.24 no.5
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    • pp.82-90
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    • 1975
  • This study investigated the deterioration phenomena of the Polyethylene surface contaminated with organic(Saccharose) or inorganic(NaCl) matters through electrical and optical experiments. And also these experimental results relatively well coincided with which was treated by theoretical process. On the electrical experiment, relation between electric field intensity in corona discharge and time reached to the breakdown, and relation between total amount of charges discharged and increment of applied voltage were investigated. On the optical experiment, discharge time dependence of surface deterioration rate and process of surface deterioration in the X-ray diffraction pattern were investigated. It was concluded that chemical effects by the corona discharge deteriorated insulation characteristics of Polyethylene surface.

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