Preparation and reliability study of thermally conductive silicone grease with ultra-low thermal resistance
A type of ultra-low thermal resistance and high thermal conductivity silicone grease was prepared by using dimethyl silicone oil and phenyl silicone oil as the matrix resins,and aluminum oxide,boron nitride,nano calcium carbonate,zinc oxide,and fumed silica as fillers.Its thermal conductivity,dielectric properties,and reliability were studied.The research results showed that,(1)The use of modified coupling agents to treat thermal conductive fillers and the addition of stabilizers could effectively improve the separation of oil and powder in the silicone grease,allowing the thermally conductive silicone grease to maintain good contact with the interface and thus maintain good thermal conductivity.(2)Viscosity studies showed that under cold and hot shock and"double 85"conditions,the viscosity of thermally conductive silicone grease decreased compared to the initial viscosity,and the change in viscosity with aging time was not significant,maintaining a relatively stable level overall.(3)Thermal resistance analysis showed that the thermal resistance of thermally conductive silicone grease could remain relatively stable after high-temperature aging.As the number of cold and hot shock cycles increased,the thermal resistance gradually increased.Under the"double 85"condition,the thermal resistance of thermally conductive silicone grease increased first and then decreased with aging time,reaching its maximum value after 250 hours of aging.(4)Under the same aging time,as the temperature increased,the thermal conductivity of thermally conductive silicone grease showed a trend of first increasing and then decreasing.With the extension of aging time,the thermal conductivity showed a significant downward trend,indicating that both thermal shock and"double 85"had a significant impact on the thermal conductivity of thermally conductive silicone grease.(5)The prepared thermally conductive silicone grease had ultra-low thermal resistance and could maintain a paste-like state after environmental aging.The maximum thermal resistance was at a relatively low level and had good thermal conductivity,which could meet the requirements of electronic and electrical products.
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