Extruded metal heat sinks are among the lowest cost, widest used heat spreaders in
electronics thermal management. Besides their affordability, extruded heat sinks are
lightweight, readily cut to size and shape, and capable of high levels of cooling.
Most extruded heat sinks are made from aluminum alloys, mainly from the 6000 alloy
series, where aluminum dominates. Trace amounts of other elements are added, including
magnesium and silicon. These alloys are easy to extrude and machine, are weldable, and can
be hardened.
Common alloys for extruded heat sinks are the 6063 metals. These can be extruded as
complex shapes, with very smooth surfaces. 6061 aluminum is also used for extrusions. Its
tensile strength (up to 240 MPa) is superior to 6063 alloys (up to 186 MPa). In addition
to heat sinks, these aluminum alloys are popular for architectural applications such as
window and door frames.
The surfaces of these metals can be anodized to replace their naturally occurring
surface layer of aluminum oxide. Anodizing provides more heat transfer, corrosion
resistance and better adhesion for paint primers. It is an electrochemical process that
increases surface emissivity, corrosion and wear resistance, and electrical isolation.
The Extruding Process
Aluminum alloys are popular for extruding as heat sinks because they provide both
malleability and formability. They can be easily machined and are as little as one-third
the density of steel. This results in extrusions that are both strong and stable, at a
reduced cost relative to other materials.
The aluminum extrusion process starts with designing and creating the die that will
shape the heatsink extrusion.
Once this has been done, a cylindrical billet of aluminum is heated up in a forge to high
temperatures, generally between 800-925°F (427-496°C). Next, a lubricant is added to the
aluminum to prevent it from sticking to any of the machinery. It is then placed on a
loader and pressure is applied with a ram to push heated aluminum through the die.
During this process, nitrogen is added in order to prevent oxidation. The extruded
part will pass completely through the die and out the other side. It has now been
elongated in the shape of the die opening. The finished extrusion is then cooled, and if
necessary, a process of straightening and hardening creates the finished product.
They can be cut to the desired lengths, drilled and machined, and undergo a final
aging process before being ready for market. [4]
Finished heat sinks typically come with anodized surfaces, which can enhance their
thermal performance. Alternatively, a chromate finish provides some corrosion protection,
or can be used as a primer before a final paint or powder coating is applied. [5]
Shapes of Extruded Heat Sinks
Extrusions tooling heat sink profiles range from simple flat back fin structures to
complex geometries for optimized cooling. They can be used for natural (passive) or forced
convection (active) with an added fan or blower. Extruded profiles can also include
special geometries and groove patterns for use with clip or push pin attachment systems.
6063 aluminum alloy has a thermal conductivity of 201-218 W/(mK). Higher tensile
strength 6061 aluminum’s thermal conductivity ranges from 151-202 W/(mK).
Besides choosing the aluminum alloy, selecting an optimal extruded heat sink should
factor in its overall dimensions and weight, the specified thermal resistance, and the
extrusion shape (flat-back, flat-back with gap, hollow, double-sided, etc.). [7]
Extruded heat sinks can be designed with very thin, and thus more, fins than other
sink types. They can be extruded with aspect ratios of around 8:1, which can greatly
optimize heat sink performance. A heat sink’s aspect ratio is basically the comparison of
its fin height to the distance between its fins.
In typical heat sinks the aspect ratio is between 3:1 and 5:1. A high aspect
extruded heat
sink has taller fins with a smaller distance between them for a ratio that can be
8:1 to 16:1 or greater.
Linear Cellular Alloys (LCAs) are metal honeycombs that are extruded using powder
metal-oxide precursors and chemical reactions to obtain near fully dense metallic cell
walls. Either ordered periodic or graded cell structures can be formed. In this work, the
performance of heat sinks fabricated from stochastic cellular metals is compared to that
of LCA heat sinks. Flash diffusivity experiments are performed to determine the in situ
thermal properties of cell wall material. The pressure drop for unidirectional fluid flow
in the honeycomb channels and the total heat transfer rate of LCA heat sinks are
experimentally measured. These measurements are compared to values predicted from a finite
difference code and commercial computational fluid dynamics (CFD) software.
A three-dimensional finite element model of a multichip module (MCM) has been
developed by using ANSYS? finite element simulation code. The model has been used for
thermal characterization of the module. In addition, optimum dimensions of an external
heat sink, which maintains the specified device’s junction temperature within desired
operating temperature limits, are determined as functions of air flow rate and power
density of surrounding semiconductor devices. Parametric studies have been performed to
study the effects of heat sink height, width and length on junction-to-ambient thermal
resistance of a high power application specific integrated circuit (ASIC) device found in
the MCM assembly. A set of curves are generated to select either heat sink dimensions or
air speed for a given design requirements. Influence of the power output of surrounding
devices on the thermal performance of the high power ASIC device is also assessed. The
predicted results indicate that the ASIC device’s junction temperature as well as
junction-to-ambient resistance increase as the power of the surrounding packages
increases. This effect diminishes if a sufficiently large heat sink is used to cool the
package.
There are different metals with different properties, some metals are used for luxury
purposes such as diamond and gold, others are used for building purposes such as brass,
nickel, steel, copper, and many more. Every piece of equipment, to work efficiently,
requires a good building block. And while engineering important components it is extremely
important to look at the qualities of the material that are going to be used and it is
also important to keep a check on the factors that can affect the material, Aluminium in
this case.
Aluminum is considered the best option for engineering heat sinks because it is cost-
friendly, lightweight and most importantly has great thermal conductivity.
Which Metals Conduct Heat The Best?
Copper and Aluminium among other metals have the highest thermal conductivity. Before
using metal in any sort of application it is very important to check the thermal
conductivity of that metal. The rate of thermal conductivity helps to decide which metal
should be used for a specific purpose. Aluminum is a great conductor of heat, which makes
it useful for constructing heat exchangers. On the other hand, steel is a very poor
conductor of heat which makes it useful for high-temperature environments. This is why
Aluminum is preferred to be used in constructing a heat sink.
Thermal Conductivity
Heat transfers in three ways; radiation, convection, and conduction. Thermal
Conduction is a process where two objects of different temperatures come into contact with
one another and when they meet fast-moving molecules from the warmer object transfer the
energy to the slow-moving molecules in the cooler object.
Aluminum heat sinks
Aluminum is considered beneficial for electrical device managers. It is a great metal
to be used in the construction of critical power cooling systems. Improvement in extrusion
profile technology has made it possible to engineer heat sinks which call for a blend of
greater strength and lighter weight。
Aluminum in comparison with other metals such as copper has lower thermal conductivity
but it is far too difficult to extrude them into the shape of a heat sink. Secondly,
Aluminium is a lightweight metal, which is also another property that other metals do not
possess.
Heat Sinks
Heat sinks are mainly used inside computers to cool down the CPU(Central Processing
Unit), they are also used in lighting devices, LEDs, and power transistors.
Heat sinks are designed in a way to have a large surface area to maximize the contact
with the fluid medium, such as air or liquid coolant to absorb heat and direct it away
from the device.
Aluminum alloys are preferred to be used in constructing heat sinks. This is because
Aluminium is lighter and cheaper than copper.
How does a heat sink work?
Computers heat up and if the heat is not removed from the device it can actually
damage the entire system. To direct the heat away from the system it is necessary to
install a heat exchanger. Heat sink directs the heat away from the computer, it does this
by transferring the heat generated in the system to a fluid medium such as air or a liquid
coolant, whereby it is directed away from the device.
What is the purpose of a heat sink?
The purpose of a CPU heatsink is
basically the maintenance of the computer. Without a heat sink, the system can overheat
and therefore can stop working efficiently. To ensure smooth working of the device it is
important to install a heat sink to direct generated heat away from the system and prevent
overheating.
Why is a heat sink important?
As stated above, a skived fin
heatsink is vital for extending the life of a lighting device. It absorbs
unnecessary heat and directs it away from the device. Heat sinks increase the efficiency
of the device by removing the excess heat which is why it is an extremely important
component. Without a heat sink, computers or other related devices can expire quicker.
Heat sinks keep the system cool and provide a good working environment to the other
components which heat up quite quickly.
Factors Affecting Aluminum Heat Sink Quality
Quality Requirements For Ingots
The blend of alloys in an ingot must be strictly monitored and controlled, for
purification purposes. To make sure that the structure and properties are not imbalanced
it is important to make sure that the alloys are homogenized. The surface of the ingot
must be smooth and there must not be any sand. The end of the ingot must be flat.
Related ads
CRIMPING TERMINALS - The importance of using the right tool
CRIMPING TERMINALS - The importance of using the right tool CRIMPING TERMINALS - The importance of using the right tool Pre-insulated terminals and splices are pre-insulated RBY terminals and splices designed specifically to answer the need… Adıyaman
Ömrünü Tamamlamış Araç İşleme,Hurda Metal/ÖTA İşleme,Ömrünü Tamamlamış Araç Geçici Depolama 02166617110
18.05.2017 tarihli ve 7020 sayılı KHK’nın geçici 1. Maddesi ve buna bağlı 48 seri no’lu MTV tebliğinde belirtilen esaslar çerçevesinde, 2003 model ve daha eski motorlu taşıtlarını Büyükşehir Belediyesine bedelsiz olarak teslim etmek isteyen mükelleflerin,… Istanbul
China signage player
China signage player Histroy Founded in China in 2008, Lingyi Technology has quickly developed into a market leading of specialist technology solutions like digital signage, healthcare, retail sectors and advertising display manufacturer. Our experience… Adıyaman
China 60ml Catheter Tip Syringe factory
China 60ml Catheter Tip Syringe factory Our History Taizhou Sanxin Medical Technology Co., Ltd. is specialized drain bag,urine bag and festival lights manufacturer from the year 2011 to now. Owing a manufacturing area of 20000 square meters, the… Adana
Lovely Homemade Gift Boxes
When it comes to gifting things to the people we love, we are sure you won’t feel any surprise at all to learn that we’re massive fans of making things ourselves whenever we can. Of course, we also value the thought that goes into store bought gifts,… Adıyaman
Kadıköy ÖTA teslim yeri 0216617110
Kadıköy ÖTA teslim yeri 0216617110 Kadıköy hurda araç teslim yerleri istanbul Lider geri dönüşüm Firmasıdır. Lider geri dönüşüm Kadıköyde bulunan Ömrünü tamamlamış aracınızı ister talebinize göre yerinden teslim alarak Kadıköy ÖTA merkezine getirerek… Istanbul
Fatih Resmi Lisanslı Hurda Araç Teslim Yeri 02166617110
Fatih Resmi Lisanslı Hurda Araç Teslim Yeri 02166617110 Istanbul
Çekmeköy Öta, bertaraf , bertaraf formu, araç bertaraf formu, araç kayıttan düşme 02166617110
Çekmeköy Öta, bertaraf , bertaraf formu, araç bertaraf formu, araç kayıttan düşme 02166617110 Istanbul
What are Membrane Switches?
What are Membrane Switches? Membrane switches are a type of human-machine interface characterized by being constructed from several layers of plastic films or other flexible materials. Conductive materials and graphic inks are printed or… Adana
How Three Revolutionary Fabrics Are Greening the Industry
How Three Revolutionary Fabrics Are Greening the Industry How Three Revolutionary Fabrics Are Greening the Industry If the holiday sales are tempting you to refresh your wardrobe, consider the environmental footprint of buying a new jacket… Adıyaman
Güngören Ömrünü Tamamlamış Araçlar Teslim Yerleri 02166617110
Güngören Ömrünü Tamamlamış Araçlar Teslim Yerleri 02166617110 Istanbul
Your First Outdoor Furniture: 5 Mistakes to Avoid
Your First Outdoor Furniture: 5 Mistakes to Avoid Buying your first outdoor furniture is almost as exciting as buying your first house with a garden. Before you rush out to shop, take the time to figure out the best all-weather pieces for your… Adıyaman
Hyundai Excel 1994 Model Orjinal Çıkma Difransiyel 02166617110
Hyundai Excel 1994 Model Orjinal Çıkma Difransiyel 02166617110 Istanbul
Dr. Merritz: Lakier do paznokci – prawdziwy czy oszustwo? (Poland)
POŚPIESZ SIĘ!!! ZAMÓW TERAZ! POŚPIESZ SIĘ!!! W pielęgnacji paznokci niezwykle ważne jest znalezienie produktu, który nie tylko poprawi wygląd paznokci, ale także je odżywi. Aby poprawić zdrowie i piękno Twoich paznokci, Dr. Merritz to rewolucyjny zabieg,… Adıyaman
Büyükçekmece ARAÇ. HURDA. LİSANSLI BERTARAF TESİSİ. 02166617110
Büyükçekmece ARAÇ. HURDA. LİSANSLI BERTARAF TESİSİ. 02166617110 Istanbul
Diabetic Capsules: A Comprehensive Solution for Diabetes Management (India)
HURRY UP!!! ORDER NOW! HURRY UP!!! Gluconax is a supplement that is made entirely of natural ingredients and works to boost the body's metabolism as well as the balance of glucose and carbohydrates. You are able to control your weight and your hunger… Adıyaman
Pendik ARAÇ. HURDA. LİSANSLI BERTARAF TESİSİ. 02166617110
Pendik ARAÇ. HURDA. LİSANSLI BERTARAF TESİSİ. 02166617110 Istanbul
Gaziosmanpaşa İlçesi resmi hurda araç bertaraf tesisi 02166617110
Gaziosmanpaşa İlçesi resmi hurda araç bertaraf tesisi 02166617110 Istanbul
China crystal table lamps for living room factory
China crystal table lamps for living room factory Our factory located in Zhongshan Town - the lighting capital of the world, have more than 10 years lighting market experience, vertical integration production control, have strong competitive price, quick… Adıyaman
Lada Samara 1.5i Orjinal Çıkma Motor 02166617110
Lada Samara 1.5i Orjinal Çıkma Motor 02166617110 Istanbul
Büyükçekmece Ömrünü Tamamlamış Araçlar Teslim Yerleri 02166617110
Büyükçekmece Ömrünü Tamamlamış Araçlar Teslim Yerleri 02166617110 Istanbul
National Insiders Optimistic About Benga
CINCINNATI The in overtime on Sunday.Joe Burrow Green Bay Packers Jackets was exceptional, especially in the fourth quarter and overtime. The second-year quarterback in that span and nearly guided the Bengals to an improbable victory.His stellar play is… Afyonkarahisar
Alfa Romeo 1.6 Twin Spark Motor 021666177110
Alfa Romeo 1.6 Twin Spark Motor 021666177110 Istanbul
Şile ARAÇ. HURDA. LİSANSLI BERTARAF TESİSİ. 02166617110
Şile ARAÇ. HURDA. LİSANSLI BERTARAF TESİSİ. 02166617110 Istanbul
Wear Resistance: The underlying property in modern steels
Recent research predicts that the mining automation market will be worth $3.29bn by 2023 — a compound annual growth rate (CAGR) of 6.7 per cent since 2017. While automation greatly enhances productivity, it also places additional demands on steel… Adıyaman
Çekmeköy İlçesi (ÖTA) Ömrünü Tamamlamış Araçların Depolama ve Teslim Yeri 02166617110
Çekmeköy İlçesi (ÖTA) Ömrünü Tamamlamış Araçların Depolama ve Teslim Yeri 02166617110 Istanbul
What are some of the best home gym equipment options?
Budget, space, and health goals can all influence the type of home exercise equipment that suits a person best. Luckily, there are many options to choose from. It is often possible to get a thorough workout at home, and finding new gear can help… Adıyaman
18 Kg/h Wet Membrane Humidifier Industrial Use China
Our History Qingdao HuaYun Fog Technology Co., Ltd is established on 2016. Which is integrated to the development, production, sales and agency to provide the fogging products and also the spray system. Our aim is to make the production process more… Adana
Are stinky inflatable pool toys putting your kids at risk?
Are stinky inflatable pool toys putting your kids at risk? Are stinky inflatable pool toys putting your kids at risk? The researchers expressed concern that some of the products contain potentially hazardous chemicals that could pose a… Adıyaman
Medical Protective Clothing: The Complete Guide
Medical protective clothing, also known as medical protective suit, disposable protective coverall, or antivirus suit. Medical protective clothing refers to the protective clothing used by medical personnel (doctors, nurses, public health personnel,… Adıyaman