A: A skived fin heat sink has several outstanding advantages: (1) One-time forming with no need of further assembling or machining. It is a firm structure with no risk of getting loose or falling apart; (2) It keeps 100% of the extruded material’s thermal conductivity with no loss due to the technique; (3)It can realize a cooling structure with ultrathin fins, ultra small gap, and ultrahigh aspect ratio; (4) It is suitable for large-scale batch production with lower costs; (5) It is suitable for larger heat sinks with higher stability and easy to maintain.

A: A friction welded heat sink is formed by welding two similar or dissimilar extruded materials (typically extruded aluminum or aluminum alloys) by the friction welding technique. This technique realizes an ultra wide structure and an ultrahigh density so as to satisfy the high power cooling needs. A friction welded heat sink looks exactly the same as a typical extruded heat sink but with a larger dimension and higher cooling capacity.

A: Friction welded heat sinks are suitable for high power cooling applications in which the required dimensions exceed the dimensional limit of extruded heat sinks. In this case, two extruded heat sinks can be welded together by using the friction welding technique so as to form a large-scale ultra wide heat sink, which we called a friction welded heat sink.

A: What are the benefits of using friction stir welded heat sinks? The advantages of friction stir welding heat sinks are as follows. (1) It realized the manufacturing of high aspect ratio, ultra wide, and large-scale heat sink structures and resolved the technical bottleneck of extruded heat sinks; (2) No interface material is required to bond materials together by the friction welding technique. It’s just like extruding the material to the required form and thus it keeps 100% of the thermal conductivity of the base material; (3) Lower development cost; (4) Shorter development cycle; (5) Friction stir welded heat sinks are highly stable and easy to maintain.

A: What is the working theorem for heat pipe heat sinks? Heat pipe heat sinks work in a way that a heat pipe is hollow inside and it contains fluid that has a very low boiling point. Therefore, the fluid’s liquid-vapor phase changes within the completely sealed vacuum tube are utilized for transmitting heat. A heat pipe has very high thermal conductivity and is almost 100 times higher than that of pure copper. Due to its high thermal conductivity, it is representative for high-end heat sinks. There are three types of techniques for manufacturing heat pipes and they include groove-type, mesh-type, and sintered-type heat pipes. The commonly used materials include red copper or brass. The heat pipe manufacturing technique or material to be used on heat sinks should depend on different design requirements.