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Which is better for the heat dissipation of aluminum alloys
We often meet some customers and friends to ask us, aluminum alloy and magnesium alloy, which heat dissipation effect is better, the following should be the best explanation for this problem. First of all, the heat dissipation effect is not only related to the material, but also has a great relationship with the contact area of the material with the air and the convection speed of the air.
The thermal conductivity of magnesium alloy AZ91D is 51W/mk; the thermal conductivity of aluminum alloy A380 is 96.2W/mk, and the heat conduction function is actually doubled, which is the heat dissipation of AZ91D and A380 materials for the same volume and shape. There is still a gap in the heat conduction. That is, when the heat (temperature) produced by a heat source is transmitted from the root of the heat sink to the top, the aluminum alloy A380 is theoretically twice as fast as the magnesium alloy AZ91D.
Because the density of magnesium alloy is lower than that of aluminum alloy, that is, the same volume, magnesium alloy is much lighter. The weight of aluminum alloy is about 3 times that of magnesium alloy in the same product. Under the same conditions, aluminum alloy The overall specific heat capacity of the magnesium alloy is still very close.
Any heat dissipation depends on three ways of heat conduction, heat convection, and heat radiation. Although the air thermal conductivity is low, it is the way to solve the heat dissipation by the heat convection and heat radiation of the air as soon as possible. To compare the temperature difference between the root and the top of the heat sink, in fact, it is not helpful for the entire heat sink, because the ultimate goal of heat dissipation is to reduce the temperature by air.
This means that the air temperature at the root of the heat sink made of AZ91D material is different from the air temperature at the top, which is larger than the heat sink made of A380 material, which will only accelerate the diffusion convection of the inside and outside air of the heat sink, so that the heat dissipation efficiency is improved. .
Considering the shape problem and the air circulation problem, the magnesium alloy will have a more efficient heat dissipation effect. Taking the common comb-shaped heat sink as an example, the temperature difference between the air temperature at the root of the heat sink and the air temperature at the top of the magnesium alloy AZ91D material is different. Compared with the heat sink made of aluminum alloy A380 material, it accelerates the convection of the air inside the radiator, which improves the heat dissipation efficiency.
That is to say, in the same volume and shape, the magnesium alloy AZ91D will have better air diffusion convection effect, and the heat dissipation effect is better than that of the aluminum alloy A380.
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