Introduction of surface treatment of aluminum heat sink

Because of the particularity of the customer's products, sometimes the customer has some special requirements on the surface of the aluminum heat sink. For example, extruded aluminum heat sink, its surface corrosion resistance is not very strong, so sometimes the need for anodizing (blackening) for surface treatment to increase the corrosion resistance, wear resistance and appearance of the beauty of the aluminum.

The main process of anodized aluminum heat sink anodized process is as follows:

Surface pretreatment: clean the profile surface with chemical or physical methods, exposing the pure matrix, in order to obtain a complete, dense artificial oxide film. A mirror or matte surface can also be obtained mechanically.

Anodizing: for the profile pretreated on the surface, under certain technological conditions, anodizing occurs on the surface of the matrix, resulting in a dense, porous and adsorptive layer of AL203.

Seal the pores: seal the pores of the porous oxide film after anodizing , so that the anti-pollution, anti-corrosion and anti-wear properties of the oxide film are enhanced.Oxidation film is colorless transparent, the use of the strong adsorbability of the oxidation film before sealing the hole, adsorption deposit some metal salt in the film hole, can make the aluminum profile appearance appears ecru (silver-white) many other colors, such as: black, bronze, gold and stainless steel color.

The production and processing of bonded fin heat sink

Bonded fin heat sink is a kind of high power electronic heat sink made of base and finr through mechanical processing. Can be customized according to user requirements, to meet a variety of different cooling needs.

1. Bonded fin heat sink before the mold test, should first adjust the extrusion center, extrusion shaft, spindle and mold seat outlet in a Central Line.

2. During the mold test and normal production process, the heating temperature of aluminum rod should be between 480-520℃.

3. Bonded fin heat sink mold in the mold test or production process, if found blocking, tooth deviation, fast and slow deviation is too big phenomenon to stop immediately, and in the way of point back, try to avoid the scrap of the mold, reduce the loss.

4. In the straightening process, to carefully detect before and after the change of bonded fin heat sink, operating specifications, moderate force, strict guarantee product quality.

5. The operator shall set the scale reasonably according to the requirements of the production plan. When sawing, the feeding speed of sawtooth shall not be too fast to avoid damaging the end.

6. Finished products in the basket to be standardized, including the pad to be placed reasonably, to avoid damage to the profile.

https://www.lorithermal.com/electronic-heat-sink

Why do copper heat sinks dissipate more slowly than aluminum heat sinks

Copper absorbs heat faster than aluminum, and copper loses heat faster than aluminum. So the copper heat sink base is equipped with the fan of high rotating speed, big air volume commonly, increase the heat dissipation capacity of copper base. The heat sink manufacturer also borrowed this idea to launch plug copper, set copper heat sink, reason is to use copper to take away heat quickly, send out quickly through aluminous qualitative fin next

 After all, what is the scientific basis for the statement that copper absorbs heat faster than aluminum, and copper loses heat faster than aluminum? Perhaps you can clearly say a few, today small make up to tell you the basic principle of this phenomenon.

Thermal conductivity K (W/m2K)

Silver 429

Copper 401

Gold 317

Aluminum 237

The popular definition of heat transfer coefficient is "heat per unit area per unit time at unit temperature difference", the unit is J/m2ks, or W/m2k, where J is the unit joule of heat, m2 is the unit square meter of area, K is the unit kelvin of temperature, can also be replaced by C on the Celsius scale, s is the unit second of time. From above the heat conduction coefficient of copper is about 1.69 times that of aluminium, because this uses copper and aluminium to make the heat sink of same sectional area, inside unit time pure copper can take away more heat than pure aluminium, "copper absorbs heat faster than aluminium", the preceding half sentence has been proved.

Material specific heat capacity J/kgK

Aluminum 0.9

Silver 0.24

Copper 0.39

Copper loses heat as fast as aluminum, which is true. Proving this leads to another important thermodynamic parameter: specific heat. Anyone who has studied high school physics knows that specific heat is defined as "the amount of heat required to raise the temperature of a substance by one degree per unit mass," in units of J/kgK. You can also see from the table above that the specific heat capacity of copper is smaller than that of aluminum. Copper should lose less heat than aluminum if it loses 1 degree of temperature. In this way, copper should lose heat faster than aluminum. However, you may not have noticed that the density of copper is 8.9kg/m3, while that of aluminum is only 2.7kg/m3, which is nearly 3.3 times that of aluminum. Therefore, if you make a heat sink of the same volume, the mass of copper is nearly 3.3 times larger than that of aluminum, and the heat capacity of pure copper is still nearly half that of pure aluminum.The larger the heat capacity, the slower the heat dissipation.Through the explanation of the above theory, we have also found out the reason why "copper loses heat faster than aluminum".　　

We fundamentally understand that "copper absorbs heat faster than aluminum, copper does not dissipate heat as fast as aluminum". When choosing heat sink later, can apply this theory, if choose pure copper heatsink, should choose to equip with rotating speed taller, the fan product with larger air volume, avoid copper heat to send out not, generation dissipates heat bottleneck.

Bonded fin heat sink

Bonded fin heat sink production is not complicated, it is a kind of structure is simpler product, but its power is very high, specification is a lot of, The process is also relatively simple, Therefore, a lot of customers who do not have high requirements for the process will choose to bonded fin heat sink for heat dissipation.

As shown in the picture above, this is a bonded fin heat sink customization project recently received by lORI. After our preliminary design and production, this batch of bonded fin heat sink has been basically completed, will enter the final process, can be delivered soon.

Though the main direction of the Lori positioning for extruded heat sink , heat pipe heat sink , water cooling plate technology better and more efficient products, but we still retains its bonded fin heat sink r &d and production team, is still a professional bonded fin heat sink manufacturers, for the majority of industry users to provide long-term high-quality bonded fin heat sink and cooling solution.

If users have higher requirements for heat dissipation, they can also use a single side combined heat sink solution, which is a product newly developed by LORI this year and can perfectly replace bonded fin and skived fin.

Aluminum heat sink production and processing requirements

The material that produces aluminum heatsink heat conduction property is good, at present the majority uses 6063 aluminium alloy, its have the characteristic such as easy processing, heat dissipation performance is good, mechanical property is good. Additional need from ingot, mold, extrude craft a few respects to cooperate, ability produces heat sink profile smoothly.

Because the mold of aluminum extrusion heat sink profiles are a lot of long and thin fin, want to bear very big extrusion pressure, every heat sink fins should have very high strength and toughness, if the performance between each other has very big difference, easy to make the strength or toughness of those teeth produced fracture.

Can smooth extrusion success, the key is the design of the mold to reasonable, manufacturing to accurate, this aluminum heat sink manufacturers of higher technical requirements, only strong manufacturers can complete from mold design extrusion to the finished product of the whole process.

How to choose the photovoltaic inverter heat sink ?

Industry users are paying attention to the overall performance of the photovoltaic inverter, not just focus on their conversion efficiency, the largest dc voltage, ac output power, protection grade, such as heat dissipation problem of photovoltaic inverter also need us to pay special attention to, choose a high performance inverter heat sink is very necessary, because it will directly affect the inverter heat dissipation performance indicators.

Various components in the photovoltaic inverter have rated operating temperature. If the photovoltaic inverter  heat sink selected by the inverter has poor heat dissipation performance, when the inverter continues to work, the heat generated by the components inside has been collecting in the cavity, and its temperature will become higher and higher. High temperature will reduce the performance and life of components, the machine is prone to failure.

When the inverter works, it generates heat, and the power loss is inevitable. For example, for an inverter of 5kW, the system heat loss is about 75-125w, which affects the power generation. To solve the heat dissipation problem of inverter, it is best to cooperate with heat sink manufacturers to customize the inverter heat sink. After the heat sink manufacturers optimize, the heat dissipation loss can be reduced.

The heat dissipation mode of the photovoltaic inverter heat sink

At present, the heat dissipation technology used in photovoltaic inverter heat sink mainly includes natural cooling, liquid cooling, forced air cooling heat sink, etc., and its main application forms are natural cooling and forced air cooling.

The natural cooling of inverter heat sink

Natural cooling means that no external auxiliary energy is used to let the local heating device dissipate heat to the surrounding environment, so as to achieve temperature control. Natural cooling is suitable for low power devices with low requirements for temperature control.

Forced air cooling of inverter heat sink

In general, the cooling method of forced cooling is mainly by means of fans and so on, thus taking away the heat emitted by the device. At present, the material of this kind of high power heat sink basically is to wait with aluminous, or cupreous aluminous compound.

Lori has cooperated with many enterprises in the photovoltaic industry, and has provided them with efficient inverter cooling solutions for a long time. Whether it is natural cooling or forced air cooling, we have successful application cases. We can provide various types of heat sink products, such as skived heat sink, water cooled heat sink, heat pipe heat sink and so on. For further information, please contact us.

Custom Heat Sink Market Forecast, Manufacture Size, Developments and Future Scope

Heat Sink market report helps you anticipate the future and make better use of the business cycle.. The heat sinks industry Outlook can help you anticipate upcoming trends. Lori present the analysis of Heat Sink Market.

 The Custom Heat Sink Market Segmentation:

 Heat sink Types

Aluminum heat sink

Copper heat sink

Copper aluminum heat sink

Heat sink Industry

Automoblie industry

Electronic industry

Region of Heat Sink Market

 North America Country (United States, Canada)

 South America

 Asia Country (China, Japan, India, Korea)

 Europe Country (Germany, UK, France, Italy)

 Other Country (Middle East, Africa, )

 Heat Sink Market – Size, Growth, Forecast

LED heat sink cooling method

This is the most common way to dissipate heat. Aluminum fins are used as part of the led heat sink to increase the area of heat dissipation.

Heat-conducting plastic heat sink
Using LED insulation heat dissipation plastic instead of aluminum alloy to make heat dissipation body, can greatly improve the heat radiation ability.

Surface radiation heat dissipation treatment
The surface of the led heat sink do radiation heat treatment, simple is to apply radiation heat paint, can be taken away from the surface of the  with radiation.

Air hydrodynamics.
The shape of the led light heat sink is used to create convection air, which is the lowest cost way to enhance heat dissipation.
Fan

Inside the led heat sink, long-life and high-efficiency fan is used to enhance heat dissipation.However, changing the fan is troublesome and not suitable for outdoor use, which is a rare design.
Heat pipe
Heat transfer tube technology is used to channel heat from LED chip to heat sink cooling fin. Large led lights, such as street led lights, are common designs.　　

Liquid ball bubble
The transparent liquid with high thermal conductivity was filled into the bulb of the led light body by using liquid bulb encapsulation technology. This is in addition to the reflective principle, the only use of LED chip surface heat conduction, heat dissipation technology.
Use of led light holder
In the home type of small power LED light, often use the internal space of the led light cap, the hot drive circuit part or all put in.This can be used as a screw cap such as a larger metal surface of the led light, because the cap is closed to the base of the metal electrode and power line. So some of the heat can be derived from that.
Integration of heat conduction and heat dissipation -- application of high heat conduction ceramics
The purpose of heat dissipation of led heat sink is to reduce the working temperature of LED chip. Due to the large gap between the expansion coefficient of LED chip and the thermal conductivity and heat dissipation coefficient of metal commonly used, the LED chip cannot be directly welded to avoid the damage of LED chip by high and low temperature thermal stress. The latest high thermal conductivity ceramic materials, thermal conductivity close to aluminum, expansion system can be adjusted to sync with the LED chip. In this way, heat conduction and heat dissipation can be integrated to reduce the intermediate link of heat conduction.

Why is the aluminum heat sink anodized?

Aluminum is a material with good thermal conductivity, so mainly used for heat sink production, aluminum material heat sink we commonly known as aluminum heat sink, all aluminium profile here is not to point to aluminium only, still included aluminium alloy product. Aluminum is soft in texture and has poor corrosion resistance, so the aluminum heat sink will need some necessary surface finish, anodization is a universal surface finish.

　Anodization usually refers to sulfuric acid anodizing, which is the process of forming an oxidation film on aluminum products (anode) under the action of the applied current under the corresponding electrolyte and specific process conditions. This layer oxide film improves the surface hardness and abrasion resistance of aluminum alloy, so as to extend the application range and extend the service life of aluminum heat sink.

 

In addition, aluminum heat sink through anodized, color will become black, so anodizing is also called black anode, or black oxidation. Anodized aluminum heat sink can also increase the appearance of the product, many electronic products base and housing are black, heat sink is black can form unified tonal, increase beautiful degree. There are customers of the water cooling plates heat sink will also be anodizing surface finish, especially for laser and other optical instruments on the water cooling plate.

Extruded aluminum heatsinks

Extruded heat sink are the most common heat sinks used for thermal management today. They are manufactured by pushing hot aluminum billets through a steel mold to produce the final shape. The most common aluminum alloy is 6063-T5, but other 6XXX aluminum alloys can also be examined as needed. When the material is extruded, the initial sticks are 30-40 feet and length and are very soft. The aluminum material is stretched by grabbing both ends to produce a straight stick. After the stretching, the aluminum material can be either air or over aged depending upon the required final hardness of the material. After aging process, the extruded aluminum enclosure is cut to the final length and any final fabrication (holes, pockets, or other secondary machining) can be done. Extruded aluminum heatsinks are usually supplied with a “finish”, such as anodizing, which can enhance its thermal performance. The heat sink can also be supplied with a chromate finish, which provides some corrosion protection, or can be used as a primer before a final paint or powder coating is applied. While each extruded shape is unique to the requirements that it was designed for, extruded aluminum heatsinks are the most cost-effective cooling solution. Each shape is engineered to achieve the optimal thermal and structural performance. Lori is the good aluminum heat sink suppliers in china,our lori partners with a large list of vendors which insures that you have the best thermal solution based on your system structure and thermal requirements.

Seven advantages of composite die cast aluminum heatsinks

Professor lu bin, deputy director of the institute of building environment and energy conservation, Chinese academy of building sciences, expressed his appreciation for the success of the research and development of the composite die-cast aluminum heat sink. He published a research report recommending that the composite die-cast aluminum heat sink has the following advantages in structure and performance:

1, corrosion resistance, high pressure resistance, durable, suitable for different water heating system.

2. Simplified the composite process of heat transfer resistance and tube expansion, and improved the overall heat dissipation performance of the heating system.

3. Superior thermal performance and high metal thermal strength.

4. Avoid the heat dissipation airflow to smoke the wall, and the heat dissipation effect is excellent.

5, free assembly, flexible assembly, easy installation.

6, heat sink body surface without volatile harmful substances, will not cause harm to the environment and human body.

7, simple, beautiful, generous, can be in harmony with home decoration, symbiosis, safe and reliable. Qingdao university of science and technology professor shuang-xi zhang also for compound die casting aluminum heat sink approvingly, he said: two pipe die casting aluminum heat sink, as a new type of high-grade heat sink, in the guarantee of the beautiful sex without fear of bad water quality at the same time, both advantages of steel and aluminum alloy heat sink, with large investment, large-scale, big development characteristics, can promote the industry long-term stable development, to speed up the development.

Aluminum profile heat sink

Aluminum profile heat sink is also known as aluminum heat sink or sunflower aluminum profile, aluminum profile heat sink with beautiful appearance, light weight, good heat dissipation performance, energy saving effect. LORI THERMAL, relying on long-term accumulated technical experience and production process, set aluminum alloy profile with better thermal conductivity and other characteristics, developed to meet customer requirements for product differentiation, specialization and personalized customized aluminum profile heat sink. The finished aluminum heat sink surface is anodized to improve the corrosion resistance, wear resistance and appearance of aluminum. 

At present, the commonly used types of heat sink aluminum profiles in China are: electronic, electrical, computer heat sink aluminum profiles, sunflower aluminum profiles, power semiconductor heat sink profiles and so on.

Aluminum heat sink because of its superior performance is widely used in: machinery, automobile, wind power, construction machinery, air compressor, railway locomotive, household appliances and other industries.

Aluminum Extruded Heat Sink

Aluminum extrusion (Extruded) technology: as containing the highest amount of metal in the crust, the low cost is its main features, and because of the aluminum extrusion technology and equipment costs are relatively low. So the aluminum have long been used in the heat sink market. Simply put, aluminum extrusion technology is to heat aluminum ingots to about 520~540℃ at high temperature, under high pressure to let the aluminum liquid flow through the extrusion mold with grooves, to make the first heat sink. Then, after cutting and cutting the first heat sink, the heat sink we often see is made. AA6063, which has good thermal conductivity (about 160~180W/m.K) and processability, is the most commonly used aluminum extrusion material. However, due to the limitation of its own material, the ratio of fin thickness and length cannot exceed 1:18, so it is difficult to improve the heat dissipation area in a limited space. Therefore, the heat dissipation effect of aluminum extruded heat sinks is relatively poor, and it is difficult to be competent for today's increasingly high frequency CPU.