What is the difference between thermal silica gel and ceramic heat sink?
What are the differences between thermal silica gel and ceramic heat sink? If discussing and distinguishing from the temperature range, material hardness, insulation performance, thermal conductivity, bonding performance, etc., the specific distinction is stated as follows.
Performance and characteristics of thermally conductive silicone sheet
The temperature resistance range of thermal silica film:
The high temperature working range of the high thermal conductivity silicone sheet is 200°C, but the ceramic heat sink can be used normally in a high temperature environment above 1700°C.
Material hardness of thermal conductive silicone sheet:
Thermally conductive silicone sheet is a kind of elastic silicone material with relatively good compressibility, while ceramic heat sink is a kind of high-hard ceramic material. In terms of hardness, ceramic heat sink is much higher than thermally conductive silicone sheet.
Insulation performance of thermally conductive silicone sheet:
The breakdown voltage of the thermally conductive silicone sheet is 4.5KV/mm, while the breakdown voltage of the ceramic heat sink is 15KV/mm, and the volume resistance of the ceramic heat sink is also as high as 1012Ω·m。
Ceramic heat sink performance and characteristics
Thermal conductivity of ceramic heat sink:
The thermal conductivity of thermally conductive silica gel is far inferior to that of thermally conductive ceramics doped with a large amount of alumina and aluminum nitride. The thermal conductivity of alumina ceramic heat sink is more than 5 times that of high thermally conductive silica gel.
Fitting performance of ceramic heat sink:
The good insulation and soft band performance of the thermally conductive silicone sheet make it extremely superior in adhesion performance, and it also makes it extremely widely used in heat conduction and heat dissipation on the chips of various electronic products, but the heat transfer of the thermally conductive ceramic sheet requires a certain amount of heat conduction. Silicone grease increases its conformability, which is also one of the main reasons why thermally conductive ceramic sheets are not widely used in electronic products for heat conduction and heat dissipation.
Even though ceramic heat sinks have many advantages, they cannot completely replace thermally conductive silicone pads, just as thermally conductive silicone pads cannot completely replace thermally conductive silicone grease, because each thermally conductive material has an electronic thermal conductivity application scenario that adapts to its characteristics. , Like the thermal conductive silicone grease for desktop computer chips, the thermal conductive potting glue for outdoor lighting fixtures, and the heat-dissipating graphite sheet in smart phones.
