| Die casting
engineers commonly choose among three different types of metal alloys -
magnesium, aluminum, and zinc. |
|
Three alloys
with different properties can be
considered for the heat sink block. |
| Alloy
Properties |
Target
+ (Priority) |
Magnesium
AZ91D |
Aluminum
380 |
Zinc
ZAMAK #3 |
| Density
(g/cc) |
<
3.0 (High) |
1.81 |
2.74 |
6.6 |
| Thermal
Conductivity (W/moK) |
>
90 (High) |
72 |
96.2 |
113 |
| Ultimate Tensile Strength
(ksi) |
>
30 (Low) |
34 |
46 |
41 |
| Tensile Yield Strength (ksi) |
>
20 (Low) |
23 |
23 |
32 |
| Hardness
(BHN) |
>
70 (Low) |
75 |
80 |
86 |
| Alloy
Cost ( $ / pound) |
<
$1.00 (High) |
$1.65 |
$0.93 |
$0.69 |
|
Alloy Data from the
NADCA Handbook: Product Specification Standards for Die Castings;
Alloy Costs = Market Price January 2005. |
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