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Ask：Heat transfer principle of thermal silica film and why use thermal silica filmAnswer：The existence of the thermal conductive silicone sheet is mainly not directly radiated, and the heat dissipation is required by the heat sink. When the heat source is connected to the heat sink, the contact surface roughness is irregular, so a certain contact thermal resistance and contact thermal resistance are generated. It is caused by heat transfer. The contact thermal resistance will make the heat conduction channel not smooth, so that the heat accumulation on the contact surface is too large, so that it cannot be quickly and effectively conducted to the surface of the heat sink or the outer casing, so if it is not filled with a thermal conductive silicone sheet, It is difficult to achieve effective cooling. Without the use of thermal silica gel sheets, even the product will transiently overheat during thermal shock, resulting in a crash to reduce product life. At the same time, air is a poor conductor of heat, if the space between the contact surfaces is too large or there is The effect of the gap on the heat dissipation is huge. The thermal conductive silica gel sheet is solid and soft, has good compression performance, and is not easily deformed. It can fill the contact area well and make all the bad conductors of the contact surface are discharged. Therefore, it is required in various industries in the electronics industry. Thermally conductive silicone sheets are basically used in places where heat is dissipated.
Ask：Does the thermal silica sheet have precipitated substances at high temperatures?Answer：Any company's thermal silica gel sheet will have silicone oil in it. In addition to silicone-free silicone sheet, our production process has been specially treated with high-temperature chemical treatment and vacuum treatment to solve the problem of silicone oil precipitation. After the test, it was concluded that our thermal silica film did not have silicone oil.
Ask：Distinguish between thermal grease and lubricating greaseAnswer：Thermal grease is also called thermal grease. Its main raw material is silicone germanium. It is made by adding high-performance thermal conductive materials such as thermal powder. It is used for heat dissipation of high-frequency electronic components such as power amplifiers, heat-generating transistors, and CPUs. The parts operate in an excellent temperature environment.
Thermal grease is a highly thermally conductive silicone material that will never cure after use and can remain in a long-lived state at temperatures between -50 ° C and +230 ° C. It has excellent thermal conductivity, low oil dispersion and tends to zero, high and low temperature resistance, water resistance and weathering resistance. It can be widely applied to various electronic products, the contact surface between the heating body (power tube, thyristor, electric heating stack, etc.) and the heat dissipation device (heat sink, heat sink, housing, etc.) in the electrical equipment. Heat transfer media and moisture, dust, corrosion, shock and other properties. It is suitable for surface coating or integral potting of various microwave devices such as microwave communication, microwave transmission equipment, microwave dedicated power supply, and regulated power supply. This kind of silicon material provides excellent thermal conductivity for generating hot electronic components. Such as: transistors, CPU assembly, thermistor, temperature sensor, automotive electronic components, car refrigerators, power modules, printer heads, etc.
Thermal grease can also be called thermal interface material, used to fill the gap between the CPU and the surface of the heat sink. Its function is to transfer the heat from the CPU to the heat sink, so that the temperature of the CPU can run stably for a long time, prolong the service life and prevent the CPU from being Bad heat dissipation and damage
In heat and heat transfer applications, even if the two surfaces with very smooth surfaces come into contact with each other, voids appear. The air in these gaps is a poor conductor of heat, which hinders the conduction of heat to the heat sink. Thermal grease is one that can fill these gaps
The liquid part of the thermal grease is composed of silica gel and silicone oil. Most of the products on the market use dimethyl silicone oil as the raw material, while the boiling point of dimethyl silicone oil is between 140 ° C and 180 ° C, which is easy to volatilize. There is oil leakage and there will be traces of grease on the circuit board. The grease detachment will make the customer feel that the silicone grease has dried up. Thermal grease has excellent electrical insulation and excellent thermal conductivity. At the same time, the oil degree is basically zero, and it is resistant to high and low temperature, water and weathering.
Ask：Selection of Hardness of Thermal Silicone Sheet in New Dynamic Source Power BatteryAnswer：Usually, when we choose a thermal silica film, the primary concern is the conductivity coefficient of the product. The thermal conductivity directly affects the heat transfer efficiency. The thermal silica film itself does not have a heat dissipation effect. Only the conduction effect, the heat source is through the heat conduction. Silicone sheets are used to transfer heat to the heat sink or housing to reduce the temperature of the heat source. Therefore, the choice of thickness and hardness of the heat conductive silicone sheet is also critical in thermal design.
Generally, the power battery and the battery module are relatively large in area relative to the consumer electronic products. If the thermal conductivity silicone sheet is too soft, it is not convenient for construction operation. If it is too soft, it is easy to deform the thermal silica gel sheet during construction, and the assembly area is not easy to master. Therefore, it is recommended that the hardness of the battery pack or the battery module is generally about 50.
Ask：About the color analysis of thermal silica gelAnswer：The main raw material of the thermal conductive silica gel sheet is silica gel plus heat conductive filler. The silica gel is transparent and colorless, so the color is mainly derived from the filler. The conventional filler is grayish white, and some are gray, so the thermal conductive silica gel is generally grayish white or gray. If there are other thermal silica gel sheets such as pink yellow green green blue, etc., they are usually added with color materials. The purpose is generally to distinguish different products or prevent others from copying.
Ask：The hardness of the thermal silica sheet will not be affected by temperatureAnswer：The thermal silica gel sheet produced by Lian Tengda Technology Co., Ltd. itself has the characteristics of natural silicone rubber material. The product has no obvious influence on the hardness between minus 40 degrees Celsius and 200 degrees Celsius. The customer is also very convenient when assembling. This is also the advantage of the wide application of thermal silica sheet material, please buyers purchase assured
Ask：What are the classifications of thermal conductive materials (thermally conductive silicone sheets) in the field of electronic applications?Answer：Thermal and thermal conductive materials are generally divided into: thermal conductive silicone sheet, thermal double-sided adhesive, thermal conductive ceramic sheet, thermal conductive silicone cloth, heat sink
Thermal silica film: The substrate is silica gel. It is a kind of thermal conductive material synthesized by adding various excipients and metal oxides. It is also called thermal silica gel pad, soft thermal pad, etc.
Thermal double-sided adhesive: from the acrylic adhesive substrate by adding a filler thermal conductive powder and silicone composite to achieve the thermal insulation insulation
Thermally conductive ceramic sheet: The biggest characteristic of this material is high thermal conductivity and high insulation. Generally, high-power equipment will use this thermal conductive material.
Thermal conductive silicone tape: The substrate of this material is glass fiber, and some people are called thermal silica gel cloth, tear-resistant silicone cloth, etc. This kind of material has better insulation ratio, and the disadvantage is that the thermal conductivity is relatively low.
Heat sink: This material is generally aluminum. Special materials such as ceramics and silicon carbide are common in the market. Generally, heat is radiated to electronic components.
Ask：Why does the heat conduction of the silica gel on the laser machine cause poor heat conduction?Answer：When we choose the type of thermal silica film, the most important parameter is the thermal conductivity. This is important, but the hardness, thickness and blocking voltage of the thermal silica film will also greatly affect the thermal conductivity of the product. When considering the film, the shape, specification, and heat resistance of the product should be considered. Then, the suitable thermal conductive silica gel sheet should be selected. The higher the thermal conductivity is, the better it is. The better the conduction.
Using a thermal silica gel product coefficient of a company on the market of 3.0 thickness of 0.8, the effect is not good when the thermal conductive silica gel applied to the laser machine is too soft to conduct heat, which indicates that the thickness is selected to be flat.
Because the heat conduction effect is inversely proportional to the thickness, the thicker the thickness, the slower the heat transfer effect, and the thicker the thermal conductive silicone sheet, the more expensive the price and the higher the cost (because of the same size, the thicker the thickness, the more materials are used)
The relationship between thermal conductivity and hardness: If the product is harder, the contact between the thermal conductive silicone and the heat-generating component and the heat-dissipating component is worse. The softer the more the contact is (but not the softer the better, because it is too soft, it is not easy to paste).
We passed the test using our LC300 thermal silica gel sheet product thickness 0.5 hardness 30±5 density 2.7 tear strength 0.29 applied to the laser machine, the test effect is very good, the heat conduction effect is also very good.
Ask：What is the difference between thermal conductive film and thermal silicone pad?Answer：Many people think that thermal conductive film is the same product as the thermal silicone pad. It is an ordinary thermal insulation material. In fact, it is reasonable to distinguish between two different names. There must be differences between them. First, heat conduction. 矽 film is generally a good layer of glass fiber, its insulation performance is very good, thermal conductivity is poor, generally this product needs to be used in conjunction with other heat-dissipating materials such as thermal grease to achieve better results, thermal silicone pad is generally No substrate, good thermal conductivity, tensile strength and toughness and insulation performance are slightly lower than thermal conductive film. Both products have their own advantages and disadvantages. Customers need to choose appropriate interface materials according to their own products.