Aluminum powder is a commonly used filler, widely used in fields such as thermal interface materials and industrial coatings. However, traditional aluminum powder has problems such as high viscosity, poor dispersibility, and poor thermal stability, which limit its effectiveness in some special applications. To address these issues, researchers have carried out many modification methods to improve the performance of aluminum powder.

A relatively effective method for surface modification of aluminum powder is to use silane coupling agents for chemical modification. For example, hexadecyltrimethoxysilane, dodecyltrimethoxysilane, decyltrimethoxysilane, and octyltrimethoxysilane can all be used as modifiers for aluminum powder. These modifiers can enhance the compatibility between aluminum powder and organic matrix, improve its dispersibility and thermal stability, and thus enhance the performance of aluminum powder in composite materials.

The specific modification method is as follows: first, add aluminum powder with an average particle size of 1-2 μ m to anhydrous ethanol, stir for 2 hours, add silane coupling agent, and stir again for 5 hours. Then, reflux the sample at 75 ℃ and use SEM XRD, FT-IR and other tools were used to test and characterize it. The results showed that aluminum fillers treated with surface chemical properties significantly improved the performance of thermal interface materials, with a viscosity reduction of 77%, a fracture elongation of 154.71%, an increase in thermal conductivity, and an increase of nearly 20% in thermal stability under extreme cold and hot cycling conditions.

In addition, thermal conductive fillers modified with different silane coupling agents have a significant impact on the dispersion of fillers and the performance of thermal conductive composite materials. The comprehensive performance of the aluminum filler modified with dodecyltrimethoxysilane coupling agent and the thermal interface material prepared by it is the most excellent. From the perspective of surface energy, reducing the surface energy of aluminum fillers is beneficial for improving the dispersibility of aluminum fillers in organic silicon matrices.

In summary, the use of silane coupling agent modification can effectively improve the performance of aluminum powder and enhance its application effect in the field of thermal interface materials. In practical applications, it is necessary to select appropriate silane coupling agents and modification methods based on specific needs, and use SEM XRD, FT-IR, TGA, and contact angle tools were used to test and characterize it to verify its modification effect.

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