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Preparation and Electrical Peoperties of High Thermal Conductive Silicone Rubber Insulating Composites

Author: ZhuYanHui
Tutor: DangZhiMin
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Silastic Thermal conductivity Micron Si3N4 Nano-Al2O3 Permittivity Insulation
CLC: TQ333.93
Type: Master's thesis
Year: 2011
Downloads: 200
Quote: 0
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Abstract


Inorganic filler / silicone rubber composites due to its excellent weather resistance, resistance, electrical insulation performance is widely used in the field of high voltage insulation , but also because of its light weight , ease of processing, has good flexibility, hate water migration is used as outdoor composite insulators . Silicone rubber matrix lower thermal conductivity properties , tear resistance , and other inorganic filler to use to improve the performance of the thermal conductivity of the silicone rubber composites widely concern , because increasing the thermal conductivity of the silicone rubber composites can effectively reduce the composite local overheating caused by high voltage partial discharge caused by the material aging , the actual value . For preparing the composite material of the high thermal conductivity of silicone rubber , the present study was prepared by adding different content microns Al2O3 ( 0.5 to 3μm) microns Si3N4 ( 0.3 - 3μm) , nano-alumina ( 13 nm) , and nano- AlN (30nm), by co- mix prepared with different thermal conductivity inorganic filler / silicone rubber composite material . When the filler volume fraction is fixed to 30% , by changing the micron silicon nitride, and the volume ratio of nano-alumina , found that the thermal conductivity of the composite material of the silicone rubber filled in all components micron Si3N4 and nano Al2O3 than microns Si3N4 (30%) thermal conductivity / silicone rubber composite material have significantly increased, wherein the the micron Si3N4 and nano Al2O3 volume ratio was 26/ 4 , the thermal conductivity of silicone rubber composite (1.64W/mK) is a silicone rubber filled by a single micron Si3N4 thermal conductivity of composite materials (0.52W/mK) three times . Also found that micron of Si3N4- nm Al2O3 / silicone rubber composite with nano A1203 filler content increase , the improvement in mechanical properties ( micro-and nano- ratio of 26 /4 its hardness , tensile strength and elongation at break to achieve the mechanical properties of the insulator standard requirements), and the electrical insulating properties of the resulting composite material with respect microns Si3N4 / silicone rubber composite material has excellent insulation properties and good stability .

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CLC: > Industrial Technology > Chemical Industry > Rubber Industry > Synthetic rubber > Fluorine rubber, silicone rubber
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