Why does a CPU need Thermal Grease?
Thermally conductive silicone grease is commonly referred to as thermal paste. Thermally conductive silicone grease uses silicone as the main raw material. It is a thermally conductive silicone grease-like compound made of materials with excellent heat resistance and excellent thermal conductivity. It is used in power amplifiers, transistors, tubes, and CPU And other electronic components to conduct heat and heat, so as to ensure the stability of electrical performance of electronic instruments, meters and so on.
Thermally conductive silicone grease is also called thermal paste and thermal paste, which is a kind of high thermal conductivity insulating silicone material.
At the same time, the product has low oil separation (toward zero), high and low temperature resistance, water resistance, ozone resistance, and weathering resistance.
It can be used for a long time at the temperature of -50 -+ 230 .
Product performance: Thermally conductive silicone grease has high thermal conductivity, excellent thermal conductivity, good electrical insulation (only for thermal insulation silicone grease), wide operating temperature, good use stability, low consistency and good Construction performance. [1]
Working temperature of thermal grease
Generally does not exceed 200 , high temperature can reach 300 , low temperature is generally around -60
Product ID | |
product description | Non-vulcanized, thermally conductive mixture |
form | Paste or flow |
Average viscosity | 2,000,000 mPa · s / 0.3rpm |
proportion | 2.9g / ml |
colour | white |
Thermal resistance (ASTM D5470) (0.1mm, 40psi) | 0.109 · in / W |
Thermal Conductivity | 2.0W / m · K ( thermal conductivity: 1.0 ~ 5.0W / m · k ) |
Volatile matter (120 -4h) | <0.05% |
Solid content (120 -4h) | 99.9% |
Dielectric strength | 5.0kV / mm |
Storage conditions | Sealed, 25 , cool place |
Density g / cm³ | 2.0 |
Thermal Conductivity | W / mk 0.8 |
Working temperature | -60 to 200 |
Cone penetration (25 ° C) | 0.1mm 260 ± 18 |
Oil deflection | (200 , 24h)% 1.5 |
Volatile matter | (200 , 24h)% 1.0 |
Volume resistivity | ? Cm 1.0 × 1015 |
Voltage breakdown strength | KV / mm 9.0 |
Molecular formula | mSiO2 · nH2O |
Viscosity | 220 |
Thermal grease is used to fill
Thermally conductive silicone grease is a highly thermally conductive insulating silicone material that is almost never cured. It can maintain the state of grease when used for a long time at a temperature of -50 ° C to + 230 ° C. It has both excellent electrical insulation and excellent thermal conductivity. At the same time, it has low freeness (toward zero), high and low temperature resistance, water resistance, ozone resistance, and weathering resistance. It can be widely applied to the contact surfaces between heating elements (power tubes, thyristors, electric reactors, etc.) and heat dissipation facilities (heat sinks, heat sinks, housings, etc.) in various electronic products and electrical equipment. The function of heat transfer medium and the performance of moisture-proof, dust-proof, corrosion-proof and shock-proof. Suitable for microwave communication, microwave transmission equipment, microwave special power supply, stabilized power supply and other microwave device surface coating or overall potting. Such silicon materials provide excellent thermal conductivity for electronic components that generate heat. Such as:
The product has good technical performance and can be directly applied. The construction method can be brush painting, roll coating, automatic extrusion machine dispensing or screen printing.
If the user dilutes with silicone oil, not only the oil separation phenomenon is easy to occur, but also the thermal conductivity will be reduced. Therefore, customers are advised to choose the model that suits them first to ensure the quality of the product.
. Clean the surface to be coated to remove oil stains.
. Then extrude the thermally conductive silicone grease directly and uniformly coat the surface to be coated.
step:
1. First clean the CPU core and the surface of the heat sink with a high-purity solvent such as high-purity isoamyl alcohol or acetone and a lint-free cloth (such as a lens cleaning cloth) (a fingerprint may be as thick as about 0.005 inches). This step can be omitted as long as the surface is clean and free of oil.
2. Determine the area of the heat sink that is in contact with the CPU, and squeeze enough heat paste in the center of the area.
3. Use a clean tool such as a razor blade, a credit card edge or a clean knife to pick up a little thermal grease and transfer it to a corner of the CPU core (such as the lower left corner). Note that only a small piece is required, about half a grain of rice.
4. Put your fingers in a plastic bag, and then rub the thermal grease on the bottom of the heat sink with your fingers until the thermal grease evenly covers the entire area in contact with the CPU. Clockwise and counter-clockwise motion can be used to ensure that the thermal grease can fill the gaps and uneven places on the bottom of the radiator. Note: Do not apply directly with your fingers.
5. Wipe off the thermal paste on the bottom of the radiator with a lint-free cloth. At this time, you can see that the area where the thermal paste is applied on the bottom of the radiator is different from other areas, indicating that the thermal paste has filled the gaps in the base.
6. Using a razor blade or other clean tool, start from the corner of the CPU core and apply the thermal grease evenly throughout the core. The flatter the surface to be contacted, the thinner the thermal paste needs. For the bottom surface of an ordinary radiator, the thickness of the thermal paste is about the thickness of a piece of ordinary paper (0.003-0.005 inches). If the bottom surface of the radiator is bright and flat, the thermal paste can be thin to translucent.
7. Make sure that there is no foreign matter on the base of the heat sink and the core of the CPU. Place the heat sink on the CPU. At this time, you can only press gently, and you cannot rotate or translate the heat sink. Otherwise, the thickness of the thermal paste between the heat sink and the CPU may be uneven.
8. Fasten the buckle and close the work.
1. Alumina (spherical, non-spherical): low price, mature application, but low thermal conductivity;
2.
1. The use of thermal grease is not as much as possible, but as thin as possible on the premise of filling the gap. Multi-coating is not beneficial, but will affect the heat transfer efficiency.
2. Keep away from children.
3. If you accidentally touch the skin, wipe it clean, then rinse with water; if you accidentally contact your eyes, immediately rinse with water and go to the hospital for inspection
Arctic Cooling has released the next generation of thermal grease. It is not easy to release better performance silicone grease in the DIY market for generations. This generation is called MX-4. Each generation of MX series silicone grease is targeted at enthusiast overclockers. This silicone grease has taken the first place among the 11 silicone grease horizontal reviews on PC Game Hardware in Germany [1] .
