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In the previous article, we have introduced the differences between aluminum extrusion and die casting. Now we start to talk about how extrusion and die-casting can be applied in the heat sink production.<\/p>\n
In the manufacture of heat sinks, the most common is the aluminum extrusion process. The technology of aluminum extrusion is relatively simple, and it is easy to post-process. The mainstream low-end products are basically aluminum extruded heat sinks. The widely used aluminum extruded material is AL6063 which has good thermal conductivity. (The thermal conductivity of AL6063 is about 200W \/ mK and the pure aluminum is 236W \/ mK.) The aluminum extrusion products have the same cross-section in any length and section so that it is impossible to manufacture a complicated shape. In addition, limited by the mold, the aspect ratio and density of the fin cannot be arbitrarily designed.<\/p>\n
For heat sinks with complex shapes, aluminum die-casting is often used, which is commonly used in notebook chip heat sinks and industrial heat sinks. Compared with the aluminum extruded heat sink, the aluminum die-cast heat sink is formed at one time, and the processing cost is low. The aluminum die-cast heat sink is generally made of ADC12, which has a thermal conductivity of about 96 W\/mK, which is almost half that of aluminum extruded heat sink. The cost of aluminum die-casting molds is also relatively high.<\/p>\n