In the case of domestic chips and packaging technology is still not mature, the system design of the lamps is particularly important. How to make the life and light quality of the chips in the best state has become the top priority for the lamps manufacturers.
In fact, the main factor affecting the above is "heat". Each chip has a node temperature. The temperature should be controlled within 85 °C to ensure the best working condition.
How can we ensure the heat transfer from the chip, the aluminum substrate , the heat transfer material to the heat sink, and the heat transfer can be smoothly and efficiently transmitted to the surrounding environment.
In addition to the careful design of the structure of each link, the material and process of each link must be carefully considered and tested to achieve the best working condition.
For everyone to focus on the commonly used lighting radiator design.
At present, the commonly used radiators on the market are designed with aluminum profiles and aluminum alloy die castings.
Common aluminum profiles are as follows:
Features of aluminum profiles:
1. Corrosion resistance - The density of aluminum profiles is only 2.7g/cm3, which is about 1/3 of the density of steel, copper or brass (7.93g/cm3, 8.93g/cm3 respectively). Aluminum exhibits excellent corrosion resistance under most environmental conditions, including air, water (or brine), petrochemicals, and many chemical systems.
2. Conductivity - Aluminum profiles are often chosen for their excellent electrical conductivity. On the basis of equal weight, the electrical conductivity of aluminum is nearly twice that of copper.
3, thermal conductivity rate - aluminum alloy thermal conductivity rate is about 50-60% of copper, which is the manufacture of heat exchangers, evaporators, heating appliances, anecdote
Appliances, as well as the cylinder head and radiator of the car, are advantageous.
4. Non-ferromagnetic – Aluminum profiles are non-ferromagnetic, which is an important feature for the electrical and electronics industries. Aluminum profiles are not self-ignitable, which is important for applications involving handling or contact with flammable and explosive materials.
5, machinability - the machinability of aluminum profiles is excellent. In various deformed aluminum alloys and cast aluminum alloys, and in various states after the production of these alloys, the machining characteristics vary considerably, which requires special machine tools or techniques.
6. Formability - The specific tensile strength, yield strength, ductility and corresponding work hardening rate govern the variation of the allowable deformation.
7. Recyclability - Aluminum has a very high recovery, and the characteristics of recycled aluminum are almost indistinguishable from that of primary aluminum.
These qualities of aluminum profiles are important reasons for their use as heat sinks.
Common aluminum alloy die castings are as follows:
Die Castability of Aluminum Alloy:
1. There are many aluminum alloys used for die-casting. The die-casting properties of each aluminum alloy are different. A reasonable die-casting aluminum alloy should have the following conditions:
1. Low melting point - reduce the temperature difference from the mold.
2, good fluidity - improve the filling ability in die casting.
3, the coefficient of thermal expansion is small - reduce shrinkage.
4, high temperature brittleness should be low - to avoid high temperature cracking.
5, the affinity with the mold is low - to avoid sticking, the iron content can not be too high.
6. The oxidizing property of the melt is small - if the melt is easily oxidized, the fluidity will be reduced.
7, the casting stress is small - to avoid deformation, affecting strength.
Second, the role of elements in die-cast aluminum alloy:
1. Silicon (Si):
Mainly improve the fluidity of die-casting aluminum alloy. At the eutectic point (12.5%), the flowability of aluminum alloy is the best. When the content of silicon in the aluminum alloy is high, the flow performance is good, but the highest is 12.5%. At the same time, the high content of silicon reduces the shrinkage, but the higher the content of silicon, the more brittle the aluminum alloy is, and the cutting is more difficult.
The main reason for the processing of aluminum alloy is toughness, easy processing and easy oxidation. The main reason for the poor processing performance of die-casting aluminum alloy is that it is not easy to be oxidized.
2, copper (Cu):
Mainly used to enhance the mechanical strength and corrosion resistance of aluminum alloys. The increase in copper in the aluminum alloy will reduce the die casting performance, but will reduce the corrosiveness of the crucible.
3. Magnesium (Mg):
It is mainly used to increase the tensile strength, hardness and corrosion resistance, and can improve the performance of the anodized film, but the increase of magnesium will increase the thermal cracking and reduce the die casting performance.
4. Iron (Fe):
The most important role of iron is to reduce the sticking mold. In order to facilitate the mold release, the alloy preferably contains 0.8-1.0% of iron. However, if the iron content is too high, hard spots will be generated, resulting in tool wear and chipping during processing.
The aluminum profile is a standard part, and when we design it as a heat sink, it is mainly based on the principle of air thermodynamics.
When the aluminum alloy die-casting design heat sink, in addition to considering the aerodynamic principle, it should also consider whether the heat dissipation area is sufficient. Increasing the heat dissipation area can be achieved by making the heat sink thin and high. In addition, due to the die-casting technology, the structure of the luminaire can be designed as a whole.
The overall material of the luminaire is the same, and the heat transfer is more efficient in the same medium. The life and light quality of the luminaire can also be a popular technical reason for the aluminum alloy die-cast structure radiator.
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