The Journal of Industry and Technology

Industrial Analytical Instrumentation

Euro Technology

Serving industry for over 36 years
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manufacturers, laboratory technicians, scientists, and research establishments

Total engineering and manufacturing

High density power loads, enclosed or
limited space, weight restrictions or limited
airflow? Aavid Thermalloy has the solution!

Over the past decade Aavid Thermalloy has pioneered heat pipe technology and its application, developing a high quality manufacturing process to ensure long life and reliability in its heat pipes.

They can quickly move heat away from temperature sensitive devices to a place the heat can be dissipated. Heat pipes can also be used to increase fin efficiency by moving heat directly to the cooler top portion of fins. Many types of applications can benefit from heat pipes, from UPS to telecommunications to motor drives and controls to transportation to servers and computers.

As well as extending the thermal range of both natural and forced convection cooling, heat pipes reduce overall cost and weight without increasing the volume in a base plate and have no moving parts. Small diameter heat pipe assemblies provide greater thermal efficiency whilst large diameter heat pipe assemblies transfer greater power loads. Aavid has also developed the Hi-ContactTM heat pipe embedding process which improves thermal transfer. View website: www.aavid.com 

New High Density Die Casting process for high thermal
performance aluminium heat sinks and liquid cold plates

Thermal management applications such as heat sinks, electronics enclosures, leak tight liquid cold plates etc. require characteristics such as high thermal conductivity, low porosity, leak tightness, and the ability to fabricate thin walls and tall fins.

Embedded inserts & surface features
Copper, graphite or other solids with lower CTE than aluminium can be embedded directly into the part. The process yields a strong mechanical bond with almost no interfacial gap or porosity. Surface features such as ribs, bosses and pockets on heat sink bases mate with electronics components and mounting hardware.

Thin and high aspect ratio fins
High Density Die Cast heat sinks offer several important advantages over their machined, die cast and extruded counterparts. The increased thermal performance coupled with the ability to expand the fin configurations, fin thickness and shapes of the heat sink are unique advantages for example pin fins, oblique or elliptical fins etc. and radial fin arrays. Many of these features cannot be achieved via extrusion or standard die casting techniques. Further, the process will allow heat dissipation fins to be formed on thinner and lighter wall electronics housings and enclosures with intricate features and low mass.

Enhanced post forming processes
Machining without exposing porosity, brazing, and porosity free welding processes enable leak tight complex assemblies. Wet surface finishing processes like anodizing and electroplating can be done without electrolyte retention in surface porosity.

In particular, liquid cold plates made using the HDDC process have a number of desirable attributes:

§ Uniform temperature distribution: The die casting like capability to make 3D fins and coolant channels and improvements in geometry features like fin thickness, draft angles, and higher conductivity alloys allows optimisation of the flow path for more uniform temperature.

§ High Volume Production: Like die-casting, the process should be suitable for high volume production including pre-fabricated inserts of copper, stainless steel or other metals for heat spreading or threaded inserts or fittings for fluid connections.

§ Totally reliable: Parts made with Al 6XXX alloys can be easily CAB or vacuum brazed, to form a 3D perfectly sealed LCP.

Aavid in profile
With 50 years of product development, engineering innovation and manufacturing expertise, Aavid Thermalloy is the thermal management provider chosen by today's leading technology companies who want to profit from Aavid's unique capability to supply a full range of advanced thermal technologies, all supported by local design centres, global manufacturing facilities and professional sales support. Aavid provides the industry's broadest product offering, ranging from the smallest board level cooling solution to several thousand kilowatt industrial applications. Aavid's products are used in a wide variety of applications from personal computers to servers, broadcasting, instrumentation, medical devices, UPS, transportation, industrial applications, renewable energy to name but a few.

For further information, view website: www.aavid.com 
Refer to page 698

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