Common LED heat sink introduction of different materials
2010/7/19

The so-called LED heat sink the LED chip is able to work quickly in the heat to the environment to export and distribute a component, so as a heat sink only have a certain area is not enough to produce heat sink material must have a certain amount of heat nature, that is to have a high thermal conductivity before you can continue to export the heat generated by the chip, and eventually San into the environment; course, for thermal conductivity material, in addition to thermal conductivity, should also have a proportion of small, low prices, high strength , easy processing characteristics.
Common materials typically include metal materials, inorganic non-metallic materials and polymeric materials three categories, which include polymer materials and plastics, rubber, chemical fiber and so on. Thermal conductivity materials are generally metal and some inorganic non-metallic materials. In common metals, aluminum and copper thermal conductivity is relatively high, but the copper price is high, than the major processing as aluminum, and aluminum heat sink can meet the requirements of LED, so the LED heat sink in the aluminum metal quality of the main radiator, copper radiator and rare, while there is a small amount of iron radiator. Good thermal conductivity of inorganic non-metallic materials before processing and more generally as a powder, need to go through special processing technology shape, after processing into the basic ceramic radiator-like; some inorganic non-metallic materials, thermal conductivity and very high insulation, but the price is high such as diamond, boron nitride, aluminum nitride, etc.; While some of the high thermal conductivity, but not insulated, like metal, such as graphite, carbon fiber, etc.; and inorganic non-metallic powder processed into complex shape of the ceramic radiator is very difficult, Thus, while the ceramic LED heat sink is applied, but have significant limitations, the need to further improve and enhance. Polymer material itself is relatively poor thermal conductivity, but if a good thermal conductivity of metal powder or non-metallic powder added to the plastic or rubber, made of thermal plastic or rubber, and its thermal conductivity will be greatly improved. Thermal conductivity of rubber because of its unique flexibility, thermal conductivity of materials can not be replaced by other, so in some areas has been widely used, but because of its less rigid, as a heat sink material may not be suitable, yet to see the related reports; thermal plastic alone or together with the metal insert is made of LED heat sink is the recent successful development of a new generation of LED heat products, if properly designed, can achieve the effect of die-cast aluminum heatsink, and the outer surface of the insulation, use more secure, the future LED Radiator development. Here are several common heat sink of the LED of different materials to make a simple introduction.
1 aluminum radiator - the more common of the LED current is mainly aluminum radiator radiator, generally include aluminum die-casting aluminum radiator and stretching two. The main reason is the higher thermal conductivity of aluminum, the proportion of small, easy processing, low price and so on. One die-casting aluminum radiator is the most commonly used, its thermal conductivity 70-90W/mK, more beautiful shape, the shape can be varied and affordable; drawback is itself not insulated for safety need to increase the insulation adhesive or sleeve, and insulation glue or set of generally poor thermal conductivity, the heat is negative, while costs will increase. In addition, die-casting aluminum radiator mold costs are high, is not conducive to the development of new products; production process consumes more energy, and secondary processing costs too large. Tensile aluminum radiator thermal conductivity 200W/mK so, good thermal conductivity, a lower processing costs, but often require secondary processing, secondary processing costs are relatively high and forms than the single, also need to increase the insulation treatment, mainly with in high power led bulbs and LED lighting.
2 thermal plastic radiator - a few big companies from abroad to develop a thermal plastic LED lights radiator, aluminum radiator not only solve the problem itself is not insulated, and the weight of the radiator has also been reduced. At present the production of LED heat sink thermal plastics companies are the Netherlands, DSM, the United States SABIC, Japan's Toray Company. Mainly by the thermal plastic nylon, PBT and other good heat-resistant plastic to enter the high thermal conductivity of inorganic fillers, such as aluminum nitride, boron nitride, etc.; itself is not very high thermal conductivity, so generally only 1-6W/mK , made with a separate LED thermal plastic radiator heat dissipation is not very good, only for small power LED lighting products, so in fact by the thermal conductivity of plastic radiator is usually plastic and aluminum pieces embedded two parts. Aluminum parts using stamping aluminum, thermal conductivity 200W/mK above, this aluminum composite radiator heat dissipation even with the die-casting aluminum radiator, or fairly close to the cooling effect, the processing is relatively easy. However, the price of the existing thermal plastic is very high, about 200-300 yuan / Kg, the price of the radiator made of die-casting aluminum radiator than high, although the production of
LED lights in some large companies like flying Philips companies have a certain application, but is not a large number of recent alternative to aluminum radiator.
3.Thertrans thermal plastic radiator - together recently by the Shanghai New Material Technology Co., Ltd. Fu developed independently of the thermal conductivity of plastic radiator Thertrans was developed by the company's thermal plastic Therpoxy (patent pending) and embedded in aluminum (aluminum LED heat sink with the thermoplastic material) form. Therpoxy thermal plastic resin by adding part of the thermal filler and other related materials as a mixture of thermal plastic, the thermal conductivity 3.6W/mK, price of 100 yuan per kilogram. The material has a thermal conductivity, insulation, fire-retardant, heat, environmental protection, anti-aging and easy to shape, light weight, low prices and so on. One fire up UL94V01.3mm, ROHS certification of environmental protection have been completed, the surface resistance, breakdown voltage above 4000V. Thertrans thermal plastic radiator appearance, changing the sample can be used injection molding machine processing, the weight ratio of the same shape about a third lower die-casting aluminum radiator, and do not have to deal with an additional insulation, and even the mouth, etc. and can be threaded together forming the radiator, effectively reducing the LED lighting manufacturer of assembly processes and costs. From the test results to see, Thertrans thermal plastic radiator cooling effect can be nearly the same shape of the die-casting aluminum radiator, equal to or even slightly better, indicating Thertrans radiator with integrated thermal conductivity of aluminum die-casting or less, or the same shape Thertrans thermal plastic and die-casting aluminum radiator heat sink thermal resistance are basically the same.
Thertrans plastic radiator thermal conductivity mechanism of the heat generated by the LED is the first rapid conduction through the aluminum plate to the embedded aluminum, then aluminum plastic by heat conduction to the outer surface of the radiator, and finally the outer surface of the heat sink and heat through convection radiation released into the environment in other ways. Another general plastic thermal radiation coefficient is higher than aluminum, so the thermal conductivity of plastic radiator surface cooling effect of radiation into the environment should be better than the same shape aluminum radiator, plastic radiator thermal radiation that is scattered
This Therpoxy thermal plastic processing equipment can also be quickly packaged LED driver power supply, or the heatsink and power supply drive one piece, so that one can effectively improve the power supply itself, heat, on the other drive power can be packaged for easy removal replacement. Thermal plastic Therpoxy heat can also be used for other needs of the occasion.


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