• Title/Summary/Keyword: Silicone Resin Mica

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Effects of Alumina Powder on the Properties of Mica Sheet Impregnated with Silicone Rubber Resin (알루미나 분말의 첨가에 따른 실리콘고무수지 함침 마이카시트의 특성)

  • Park Hyo-Yul;Kang Dong-Pil;Ahn Myeong-Sang;Myung In-Hye
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.54 no.12
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    • pp.561-566
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    • 2005
  • This paper describes electrical resistivity, dielectric strength, thermal conductivity, thermal stability and tensile strength of mica sheet impregnated with silicone rubber resin or silicone rubber resin containing alumina powder. The mica sheet impregnated with silicone rubber resin had higher electrical resistivity, dielectric strength and tensile strength than those of virgin mica sheet. Electrical resistivity of mica sheet impregnated with silicone rubber resin containing alumina increased with increasing the amount of alumina. However, dielectric strength and tensile strength of mica sheet impregnated with silicone rubber resin containing alumina decreased with increasing the amount of alumina. The mica sheet impregnated with silicone rubber resin had lower thermal conductivity than that of virgin mica sheet. However, thermal conductivity of mica sheet impregnated with silicone rubber resin conatining alumina increased with increasing the amount of alumina. In the case of thermal stability, thermal degradation of virgin mica sheet and impregnated mica sheet with silicone rubber resin did not occur up to $1100^{\circ}C$ and $400^{\circ}C$, respectively.

A Study on the Dielectric Properties of Mica-reinforced Silicone Composites (마이카 강화 실리콘 복합재료의 제작과 그 유전적 특성에 관한 연구)

  • 조정수;곽영순;김순태;박차수;박정후
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.41 no.6
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    • pp.640-651
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    • 1992
  • This paper describes the electric properties of mica reinforced silicone composites with the parameter of curing condition of silicone resin, application amount of silane coupling agent to the mica paper and the mica wt% to the composite. Heat-resistant silicone resin and mica paper made of mica flakes are used to prepared the mica/silicone composite as matrix and filler, respectively. To improve the dielectric properties and interfacial adhesion between matrix and filler, silane coupling agent is applied on the mica paper. As for matrix, tan$\delta$ value of 30$0^{\circ}C$ heat-treated silicone resin is the lowest under 1%. The optimal wt% of coupling agent is 0.3% to the weight of mica paper. 80 wt% of mica as filler to the mica/silicone composite shows the best electric properties. And the mica reinforced silicone composite shows good high-frequency and mechanical tensile stress properties.

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