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  Scientists have found that microstructure and oxygen impurity content are the two most important factors affecting the thermal conductivity of AlN ceramics. Therefore, in order to improve the thermal conductivity of AlN ceramics, more attention must be paid to the preparation of ceramic powder raw materials and sintering process - and continuous experimental research shows that refining the original aluminum nitride powder and adding appropriate low temperature sintering additives are effective solutions.   The Selection of Powder Raw Materials Aluminum nitride powder is the prerequisite and key to preparing aluminum nitride ceramic materials with excellent properties. The driving force of aluminum nitride sintering process is surface energy, and fine particles of AlN powder can enhance the sintering activity, increase the sintering force and accelerate the sintering process. It is confirmed that when the initial particle size of the original aluminum nitride powder is 20 ti...

  Excellent heat dissipation capacity is very important for LED, because in the process of converting electrical energy into light energy, there will be a large amount (70% to 80%) of the energy is converted into heat energy, and the greater the power, the more heat needs to be emitted. If these heat cannot be dissipated in time, the rise in junction temperature caused by them will not only lead to a reduction in LED output optical power, but also the chip will sharpen and accelerate, and the device life will be shortened, so LED products must ensure smooth heat dissipation. In the process of LED heat dissipation, the "package substrate" plays a very key role, so the development of high thermal conductivity heat dissipation substrate material has become an important way to solve the heat dissipation problem of LED devices and improve the luminous efficiency and service life of high-power LED.   With the increase of LED power, traditional resin substrates have long been unable...