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How does diamond conduct heat?
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How does diamond conduct heat?

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With the continuous development of technology, more and more high -power electrical and high -power microelectronics components have gradually emerged, and people's demand for lightness and performance of electronic products is increasing. The flux will also become larger and larger. Ordinary heat dissipation materials can no longer solve the problem of heat dissipation. How to give the material heat dissipation and cooling is the primary problem.

So how to choose materials in the field of heat -conducting and cooling?

At present, the more popular heat dissipation solutions include graphite, graphene, heat -conducting interface materials, thermal pipes and average heat plates, and semi -solid die -casting. The natural graphite heat dissipation film has a thicker product and is not high. It is difficult to meet the heat dissipation needs of high -power and high -integrated density devices in the future. At the same time, it does not meet people with high performance requirements such as ultra -thin and long battery life. Therefore, it is of great significance to find new materials for ultra -heat guidance. This requires that such materials have extremely low thermal expansion rates, ultra -high thermal guidance, and light and light volume. Vajrayana and graphene and other carbon materials just meet the requirements. They have a high heat conduction coefficient. The composite material is a type of potential potential heat -conducting material, which has now become the focus of attention.

Faced with the various restrictions of traditional packaging materials, various new types of heat dissipation materials have been developed. They have low thermal expansion rates and very light quality. As the representative of the above materials, diamonds are the most thermal guidance in nature. The heating rate is five times that of copper. In fact, there are various types of diamonds, such as IA, IB, IIA, IIB type, etc., for diamond I and II, which are distinguished by the different ultraviolet and infrared absorption spectrum of diamond. Different from magnetic resonance absorption is distinguished, and different types of diamonds have different thermal conductivity, that is, the thermal conductivity of the same type of diamond is not necessarily the same. The heating rate of diamond is related to the integrity of its internal structure and the type and content of the impurities. The heating rate of the same type of diamond at different temperatures is also different.

The thermal conductivity of diamonds is not fixed, and there is a range of changes. As a diamond radiator, it is mainly IIA-type monocrystalline diamond and thermal conductivity. Insulation at room temperature.

Vajrayana is a cubic crystal structure. Each carbon atom is based on the SP3 hybrid orbit to form a co -price bond with the other 4 carbon atoms to form a positive tetraonal body, because all price electrons are restricted in the common price bond area. , So diamonds are not conductive. High -heat conduction is associated with high -guide electrical, unlike metal relying on peripheral electrons for heat transfer, the thermal performance of diamonds basically comes from the spread of carbon atomic vibration (that is, sound -vocal).

The average free process is determined by the collision between the sound of the sound and the scattering of the sound of the sound of the sound. The impurities, bits and cracks in diamond stones, and other factors such as residual metal catalysts and lattice bits will collide with sounds to scatter them, thereby limiting the average freedom of the sound and reducing thermal conductivity.

When the composition of the substance is simpler, the simpler structure, and the less impurities, the faster the vocal movement, and the faster the heat transfer rate. This is because the introduction of the second component and impurities will cause distortion, distortion, and bit errors in the lattice, destroying the integrity of the crystal, and increasing the risk of scattering of sound or electrons. The composition of diamond has only a single element carbon, and the structure is also very simple. Of the four diamonds: IA, IB, IIA, and Iib, IIA is the purest and the least impurities, so it has the highest heat transfer rate.

When buying diamonds in the past, someone would lick it with the tip of the tongue. If the tip of the tongue feels cool, it is the real diamond; if it is warm, it is just glass. This process is actually using the tip of the tongue as a probe, and a comparative experiment of a thermal guidance rate on the gemstone. Because the thermal conductivity of the glass is small, and the heat transfer rate of the real drill is more than a thousand times the glass, the sensitive tip of the tongue is indeed easy to distinguish between the two.

In addition, diamonds also have the characteristics of high resistance and high -resistance, high -profile power constant, low thermal expansion, etc., which have obvious advantages in the heat dissipation of high -power optoelectric components. Great application potential.

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