Industry dynamic

What are the causes of thermal grease cracking?


Some electronic products are easy to get hot during use, resulting in slow operation or direct burnout of the motherboard. Disassemble and inspect and found that the surface of the thermally conductive silicone grease appears dry and cracked, indicating that the service life of the electronic products and the thermally conductive silicone grease are large relationship. What is the situation of cracking during the application of thermal grease, and what are the reasons?

1. Uneven

After the oil powder is separated from the thermal conductive silicone grease, the stirring is uneven before use, which leads to the phenomenon that the thermal conductive silicone grease has more powder and less oil locally during the printing and smearing process. It is difficult to lock the oil as a whole, and a small amount of oil is slowly precipitated after a certain period of time, causing the colloid to pulverize and form cracks.

2. Raw materials

The choice of silicone oil has a very important impact on the service life and performance of thermally conductive silicone grease. Silicone oil is a polymer material, but in the synthesis process, it will be mixed with low molecules. If the low molecules are not treated well to remove, it will exist in the polymer silicone oil products, and then used in the production of thermal conductive silicone grease. The thermal conductive silicone grease with low molecular content and high content is easy to volatilize at high temperature. The volatilization process of small molecules causes the colloid to expand, and the colloid will crack in severe cases.

3. Oil separation rate

The oil separation rate of thermal grease is a measure of the long-term performance of the product. Thermal grease with different formulations and production processes has different oil separation rates. The greater the oil separation rate of thermal grease, the shorter the normal use time. The reason is that the thermal conductive silicone grease with high oil separation rate, the silicone oil is relatively easy to seep out, separate from the powder, and the powder lacks the mixing of oil, which will dry out, and cracks will also appear after serious drying. Therefore, the smaller the oil separation rate, the better, and the less likely it is to crack.

No matter what the reason is for the thermal conductive grease to crack during the application process, it will directly reduce the thermal conductivity. However, whether the thermal conductive silicone grease you use will crack in a short period of time cannot be directly distinguished from the appearance or from the It is directly identified in operation, so it is necessary for users to understand the prevention and verification method of cracking during the application of thermal grease.

We use cookies to offer you a better browsing experience, analyze site traffic and personalize content. By using this site, you agree to our use of cookies. Privacy Policy
Reject Accept