Many electronic products are affected by the high temperature caused by the work, which directly leads to the rapid shortening of the service life of the product, and even stops working after the high temperature. However, the existing heat dissipation system can not meet the needs of the work at all, until the emergence of thermal grease, which effectively solves the problem of heat dissipation. The problem also reflects the importance of thermal grease. Therefore, the thermal conductivity of thermal grease is very important, so what factors will affect the thermal conductivity of thermal grease?
1. Oil separation rate
The base material generally refers to silicone oil, and the filler refers to thermal conductive material. If the compatibility of the two materials is poor, oil will appear in short-term storage. Although it can be stirred and used before application, after using it on the product? , With the extension of time, the thermally conductive silicone grease used on the product still has the phenomenon of silicone oil dissociation in a short time. At high temperatures, the remaining filler will become drier and drier, and the phenomenon of powder falling and cracking will appear, which will affect the thermal conductivity effect. , so the user first understands the thermal grease free rate parameters.
Why is viscosity also one of the reasons, because the viscosity is determined by the filler, the base material, if the filler content becomes larger or reduced, it will affect the viscosity, but also affect the thermal conductivity, but viscosity can not be used as an indicator to judge the size of the thermal conductivity.
The stickiness here is not adhesiveness. We all know that thermal grease will not cure. Stickiness refers to adhesion. If the thermal grease produced has no stickiness and is too dry, it will not be tight. If it is attached to the product and cannot be tightly attached to the product, how can the heat generated by the product work quickly disperse, so the thermally conductive silicone grease with poor viscosity is easy to separate from the product after use, which greatly reduces the thermal conductivity.
In addition, the factors that affect the thermal conductivity of thermal grease include poor radiator effect, proficiency of employees, thixotropic properties, thickness of application and so on.