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How does a diamond conduct heat?

2022-10-11 08:46:15

The heat dissipation demand of materials is becoming increasingly prominent


With the continuous development of science and technology, more and more high-power electrical appliances and high-power micro-electronic components gradually appear, and people's demand for thin and light electronic products and high performance is getting higher and higher, the power density of semiconductor components continues to increase, and the heat flux will become larger and larger. Ordinary heat dissipation materials can no longer solve the heat dissipation problem well. How to cool the material has become the primary problem.


So in the field of heat conduction and heat dissipation, how to choose materials?


At present, the more popular heat dissipation solutions are mainly graphite sheets, graphene, thermal interface materials, heat pipes and soaking plates, and semi-solid die casting. The natural graphite cooling film product is thick, and the thermal conductivity is not high, it is difficult to meet the future high power, high integrated density device heat dissipation needs, but also does not meet people's high performance requirements such as ultra-thin, long life. Therefore, it is of great significance to find new materials for superthermal conductivity. This requires such materials to have a low thermal expansion rate, high thermal conductivity, and a thin volume. Diamond, graphene and other carbon materials just meet the requirements, they have a high thermal conductivity, its composite material is a kind of heat conduction and heat dissipation materials with application potential, has become the focus of attention.


Excellent thermal conductivity and heat dissipation of diamond


In the face of various limitations of traditional packaging materials, the development of a variety of new heat dissipation materials, they have a low thermal expansion rate and very light mass, diamond as a representative of the above materials, is a high thermal conductivity in nature, people often say that the thermal conductivity of diamond is five times that of copper. In fact, there are various types of diamond, such as Ia, Ib, IIa, IIb, etc., for I, II type of diamond is distinguished by the different ultraviolet and infrared absorption spectra of diamond, while a, b class is distinguished by the different electron paramagnetic resonance absorption, and different types of diamond have different thermal conductivity. That is, the thermal conductivity of the same diamond is not necessarily the same. The thermal conductivity of diamond is related to the integrity of its internal structure and the type and content of impurities contained, and the thermal conductivity of the same class of diamond is different at different temperatures, as shown in the following table:


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