HDDC High Density Die Casting0 pages

HDDC
High Density Die Casting

RoHS
Compliant

Celebrating 50 Years of Innovation 1964-2014

HIGH DENSITY DIE CASTING
HDDC is a process developed by Aavid with
its University partners to manufacture near net
shape parts with better mechanical and thermal
properties compared to die castings.
The process is particularly well suited to making
high performance heat sinks and liquid cold
plates using aluminum alloys with high thermal
conductivity. New process controls during
solidification enable fine grain structure with
near zero porosity.

EMBEDDED INSERTS
Aluminum, copper, graphite or other solids with
lower CTE than Aluminum can be embedded
directly into the part. The process yields a strong
mechanical bond with almost no interfacial gap
or porosity.
3D Shapes of Air Cooled Enclosures

DIE CAST VS. HDDC
comparison for 40-60mm high finned heat sinks:

THIN AND HIGH ASPECT RATIO FINS

Features

Die-casting

HDDC

Fin Geometry (Plate, pin, embedded etc.)

All Types

All Types

Minimum enclosure wall thickness (mm)

2-4

1.5-3.5

Minimum fin to fin spacing (mm)

5

3-4

Minimum fin tip thickness (mm)

2.5-3.0

1.0-1.5 plate fin; 2.0 pin fin

Minimum fin tamper angle (degree)

1.0-1.5

1.0

ENHANCED POST FORMING PROCESSES

3D near net shape rating ( 5 is best )

5

4

Surface quality rating (5 is best)

2

4

Leak tight rating (5 is best)

2

5

Aluminum Alloys

ADC 10-12 or 3xxx

1xxx, 6xxx, 3xxx

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.

Thermal Conductivity (W/m K)

90-120

190-240

Porosity (%) and Grain Structure

3-7

0

USA: +1.855.32.22843

EUROPE: +39.051.764011

Smaller minimum enclosure wall thickness,
smaller minimum fin spacing, fin thickness and
draft angles result in higher cooling fin densities
and lighter enclosures.

ASIA: +86.21.6115.2000

WWW.AAVID.COM