Cause analysis of poor heat dissipation effect of thermal conductive silicone grease

    Thermal conductive silicone grease is a kind of heat dissipating product used between the heat generator and the radiator to improve the heat transfer efficiency of the components. But sometimes I bought a expensive thermal conductive silicone grease, and the heat dissipation effect was not satisfactory. Let's analyze the reasons for the poor heat dissipation effect of thermal silicone grease.

1、 The thermal resistance of the thermal conductive silicone grease purchased is high, so the heat transfer effect is not good. There are several reasons for the high thermal resistance of thermal conductive silicone grease:

(1) Low thermal conductivity of thermal conductive silicone grease

    The thermal conductivity reflects the thermal conductivity of the substance under the unit volume, which is used to evaluate the parameters of the thermal conductivity between substances. In fact, thermal resistance is the object's ability to block the conduction of heat flow, which is inversely proportional to the thermal conductivity of the material. Therefore, if the thermal resistance of thermal conductive silicone grease is high, it may be that its thermal conductivity is not high, so it is necessary to choose a higher thermal conductivity of thermal conductive silicone grease.

(2) The thickness of thermal conductive silicone grease is large

    The greater the thickness of the silicone grease with the same thermal conductivity, the greater the thermal resistance; the larger the cross-sectional area, the smaller the thermal resistance. It's not very meaningful to talk about thermal resistance in terms of every substance. Only when the geometry is determined can the concept of thermal resistance be used to compare the heat transfer capability. Under certain shapes, how to make the thickness of thermal conductive silicone grease thinnest? In general, it is desirable to use fillers with smaller particle size to obtain thinner scratch coating thickness.

(3) Poor scratchability of thermal conductive silicone grease

    If the scratch ability of silicone grease is not good, it may lead to uneven scratch thickness and large contact thermal resistance, so the overall thermal resistance increases and the heat transfer effect decreases. The scratch ability is related to the viscosity of silicone grease. The viscosity is related to the amount of powder added and the dispersion of powder. More powder and poor compatibility between powder and silicone oil will lead to poor dispersion and viscosity of silicone grease, which is not conducive to uniform coating.

2、 Of course, the thermal silicone grease may not be the real one. Although it's normal that the price determines the performance, the more expensive it is, the better, but it's not sure which businesses will raise the thermal conductivity of the silicone grease. But this is not the case. After all, before you buy it, there is no instrument to test the thermal conductivity of thermal conductive silicone grease. You can only eat Coptis.

     Dongguan Gold-cool Nano Technology Co., Ltd. has many years of research and development, production and sales experience in the field of thermal silicone grease, and provides customers with high-quality after-sales service. The thermal conductivity silicone grease produced has low thermal resistance, good thermal conductivity and heat dissipation performance, and the thermal conductivity silicone grease produced has high cost performance.

    Service hotline: 400-6235-169