The difference between silicone and silicone?
Silicone grease and silica gel although only two words in the literal sense, and all the thermal materials, but two things is completely different. Relatively speaking, the scope of the grease has a slightly wider, need to fit almost any cooling conditions; and because the silica gel once it is stuck on difficult to remove, so most of the time is used in some occasions only need one-time adhesion, heat sink such as graphics memory and memory of the particle particle. The main use of silica gel is bonding agent. We need to buy is the main heat conduction effect of silicone grease, you can not buy the wrong.
The biggest danger in silicone applications is that they lose stickiness when the chips heat up to a certain point. Although the silica gel will not lose viscosity at higher temperatures, it will take a long time to use and the heat on the heat sink can not be removed in time. The possibility of silica gel melting is considerable. I have encountered two occasions that only the heat sink and no fan card in the use of heat sink fall.
Characteristics of silica gel:Silica gel is a one component, room temperature vulcanized liquid rubber. Once exposed to air, the silane monomer condensed, forming a network structure, crosslinked, unable to melt and dissolve, elastic, rubbery, and adhesive. The thermal conductivity is slightly higher than the general rubber, but compared with the thermal grease is much lower, and once cured, it is difficult to separate the adhesive objects, generally can only be used in graphics cards, memory radiator. Mainly used in silicone adhesive low-end card heat sink and the main chip, bonding and particles, particles of the memory memory and radiator. The high-end products are generally used to dissipate heat with grease, and then use the clip fins fixed on the substrate, but it will increase the cost of. The radiating fins are fixed in the low-end graphics chip and good memory particles, and the heat sink in the low-end graphics cards generally are relatively small, so the use of silicone adhesive is common; and high-end graphics and the CPU heat is far greater than the general low-end graphics chip and memory particle heat generation, and the head is relatively CPU so, the grease with radiator and clip form. If used on the CPU will cause overheating, and it is difficult to remove the heat sink, pull down, it may directly damage the CPU or CPU socket. And if you pull down the silicone adhesive cards, heat sink, it is possible to display the chip from the PCB pull down. From this point, we can see who has a better heat conduction effect.
Silica gel and grease are helpful to system cooling material, the difference is that the silica gel with good thermal performance and insulation, and will not lose its stickiness pale yellow translucent glue at higher temperatures, mainly used in the surface of the heat radiating sheet sticking device; and the grease is not sticky, is a liquid emulsion or cream like, its role is to fill the gap between the chip and the heat sink, improve the efficiency of heat conduction.
The characteristics of silicone grease:The application of silicone grease is more widely than silica gel. Many industrial heat places are using thermal grease. Many different types of people and grease, by adding some "impurities" to its thermal conductivity to improve pure thermal grease. These impurities are graphite powder, aluminum powder, copper powder, silver powder and so on. Pure pure silicone is pure white or milky white, the color of the doped graphite grease dark black, doped with aluminum grease some gray shiny, slightly gray is silver, and copper doped grease are yellow or yellow.Now some high-grade thermal grease using silver or aluminum powder as filler, with high thermal conductivity of the metal, but relatively large metal particles, filling effect is poor, the performance increase is not large, but the improper use of conductive grease, easy to cause a short circuit.
