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usheenthermal
alibaba
When it comes to heat dissipation systems, many people think of fans and fins. In fact, they have neglected a medium which is insignificant but plays an important role - heat conduction medium. Computer CPU is a typical power equipment that needs excellent heat dissipation, so let's talk about heat conduction data.
Generally speaking, the thinner the thermal conductive silicone pad, the better, so that it can be more useful for conducting heat. However, there is also a limit, it is not possible to reach the thickness of thermal insulating materials or thermal conductive silicone screen printing.
Often we see that because you can't tell the difference between thermal conductive silicone grease and smooth silicone grease, you don't know how to use it after buying silicone grease. Maybe Zhang Guanli Dai used the wrong silicone grease and made some ironic things. As a hardware enthusiast who has been burning for several years, I have some knowledge of silicone grease. Let me give you a brief introduction to this small "silicone grease".
Mobile phones are electronic products with a high penetration rate in society. Basically, people have their own mobile phones when they go to college, and people who work in society have multiple mobile phones. As the pace of life continues to accelerate, mobile phones do not Electricity has become one of the problems that worry people, and fast charging source adapters that can realize fast charging have become people's pursuit. Major manufacturers have also realized this problem and invested in it. Under normal circumstances, the power adapter used by the mobile phone is a standard type. The charging time of the mobile phone is determined according to the battery capacity of the mobile phone, and the fast charging source adapter can greatly reduce the charging time, which can reduce the original two hours to half an hour , So that people can spend the least time to get the best results.
Under normal circumstances, there is no gap between the heat source and the radiator when observed with the naked eye, but in fact, there are some uneven pits on the surface of the two. When the two are attached, there will be some gaps. The air in the gap hinders the heat. Because of the transfer factor, direct bonding will lead to heat transfer efficiency. The heat transfer material needs to be filled here so that the gap between the two can be filled and the gap between the interface can be eliminated, so that the heat source and the radiator can be in close contact and improve the heat transfer efficiency.
Many people have a question when assembling a computer. Why do you need to apply a layer of grease to the CPU when installing the cooling fan? There is a slight gap, and the thermal conductivity of solid is better than that of gas, so theoretically the heat dissipation effect will be quite good, but in fact it is not. Why is it so? The surface of the heat sink and the CPU looks like a smooth and flat surface, but there are actually some irregular planes, so when the two are attached, there will be many pits. There are a lot of air in the pits. When the heat comes from the surface of the heat source (CPU) When transferred to the heat sink, 100% seamless transfer cannot be achieved, but some heat needs to pass through the air in the pit before being transferred to the heat sink, so the heat dissipation effect is not ideal.
When it comes to computers, people first think of thin and light displays, simple and efficient chassis, and then the world's first general-purpose computer has the size of two rooms. The computer has changed from the size of two rooms to the size of a suitcase. It can be said that the future development direction is the trend of light and thin, multi-functional. In real life, people use mobile phones, tablets, smart watches and other electronic products that are multi-functional, thin and lightweight. As time goes by, the frequency of mobile phones is also accelerated. It may have been two years before a new generation was released. Mobile phones, which may be released in half a year now, and the new generation of mobile phones are thinner, more versatile, and more durable than the previous generation, which leads to further compression of their internal space utilization. When electronic products are in use, heat will be dissipated, because the energy conversion cannot reach 100%, there will be a part of energy loss, and a large part of this part of energy is lost in the form of heat. Other analysis is When current flows through the resistor, heat is generated. This phenomenon is normal, but serious heat will cause damage to the components, so heat dissipation should be performed in time.
Automobile is a modern product that people often encounter or use. The energy it drives is fossil energy. In order to avoid the depletion of fossil energy in the future, the world has begun to vigorously promote new energy electric vehicles to reduce the need for fossil energy. Energy dependence while reducing environmental pollution, In the past, the technology of electric vehicles was not perfect, the battery life was insufficient, and problems occurred on the road. Now that the technology is gradually improved, many domestic and foreign automobiles have invested in the industry. It can be said that electric vehicles will become the mainstream of people’s future transportation. It is the energy that it drives. It needs to be charged when the power is insufficient, just like charging a mobile phone without electricity, and the charger of an electric car is called a charging pile.
Heating of equipment and equipment is a relatively common thing, and it is also a problem that people often encounter in daily life. There are many reasons for the heating of machinery and equipment, mainly because there is loss in the energy conversion process, and a large part of the loss is In the form of heat, the body heats up. Simply put, heat is generated when current passes through the resistor. In order to be able to effectively control the body temperature and ensure the stable operation of machinery and equipment. Under normal circumstances, a radiator is installed on the surface of the heat source to transfer heat to the radiator. However, if the radiator is directly installed on the heat source, the heat dissipation effect is very poor. Why does this happen?
The operation of electronic equipment is a process of energy conversion. In theory, there is no loss in converting electrical energy into other target energy and can be converted 100%. However, in reality, energy conversion cannot achieve 100% conversion, and there will be some energy. It is lost due to unavoidable factors, and in electronic equipment, much of the energy lost in this part is in the form of heat, which leads to heat generation during the operation of the electronic equipment. In order to avoid damage to machinery and equipment due to heat problems, a radiator is generally installed on the heat source to dissipate heat in a timely manner. It is not feasible to install the radiator on the heat source alone, which will cause poor heat dissipation, so both are required Fill the thermal conductive material between the gaps to fill the cavities between the gaps and remove the air between the gaps, thereby reducing the contact thermal resistance and improving the thermal conductivity.
Generally, a heat-conducting material needs to be filled between the radiator and the heat source to fill the large and small gaps in the gap and remove the air, so that the heat source and the radiator can be in close contact, improve the heat transfer efficiency, and achieve the effect of improving the heat dissipation effect. There are many kinds of thermal conductive materials on the market, such as thermally conductive silicone sheet, thermally conductive paste, thermally conductive phase change film, thermally conductive gel, non-silicon thermally conductive sheet, thermally conductive silicone cloth, etc. Each thermally conductive material has its own field and Features.
The heat generated during the operation of machinery and equipment is mainly because heat is generated when the current passes through the resistor, and the electrical energy cannot be completely converted during the conversion, and a part of the energy is lost, and heat is a larger part of it. The heat transfer efficiency in the air is low, and it cannot be quickly transferred to the outside without a special way, so it will accumulate on the surface of the heat source, and the temperature will rise over time and affect the performance of the machine.
The heat dissipation effect of the direct contact between the radiator and the heat source is very low. Even if people observe that there is no gap between the two, in fact, there are some gaps between the two, and the gap contains a lot of air, so the heat transfer efficiency will be reduced, so that The heat dissipation effect is not ideal. The thermal conductive material is to reduce the contact thermal resistance between the radiator and the heat source, eliminate the air in the gap, so that the heat source and the radiator can be in close contact, thereby improving the heat transfer efficiency.
When we as a business choose a thermally conductive silicone pad, we need to consider a number of factors, and besides thermal conductivity and cost, there are some other important considerations that need to be taken into consideration.
With the development of social science and technology, technology products have higher and higher requirements for thermal conductivity. Thermal silica gel sheets have appeared in our market. In fact, most people are still very unfamiliar with thermal silica gel sheets, but they only know about one of its functions. , The specific and more detailed knowledge is lacking, so I don't know where to start buying thermal silica gel sheets. So how do we choose when purchasing thermal silica gel sheets? What problems should we pay attention to? Under numerous specification parameters, these two problems have been bothering our relevant R&D and procurement personnel.
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