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Why Use the Bonding process

Bonded fin heat sinks offer thermal design engineers many benefits over conventional extruded aluminum heat sinks. The increased fin count of bonded fin heat sinks is the result of a tightly controlled assembly technique, allowing fin manufacture as a process independent from base extrusion. This process removes the conventional fin extrusion ratio limitation dictated by the strength of the steel in extrusion dies. Ratios greater that 6:1 (fin height above the base as compared to the narrowest open space between fins) are common place, but ratios of 8:1 and 10:1 can be done on a limited basis. Bonded-fin parts offer fin ratios as high as is practical, up to 30:1 and beyond. Increasing the number of fins increases the surface area exposed to cooling air, and greater exposed surface area means more heat transferred away from the electronics. Features and Benefits :Dissipate more heat than conventional heat sinks with the same footprint , Reduce heat sink and overall system volume .Increase the aluminum extrusion cooling surface area by two to three times Applications:Thermoelectric modules .Uniterruptable power supplies .Variable speed motor controls .AC welding switches .Power rectification equipment .Laser power supplies .Traction drives .

Liquid Cold Plate Heat Sinks
provide the best thermal performance per unit volume and counter nearly every draw-back associated with air cooling by dissipating more heat with considerably less flow volume, better temperature consistency,and less local acoustic noise. Cold plates take advantage of the increased thermal conduction properties of liquid by actively circulating fluids past a heat source through a closed loop system. These liquid passageways are formed by sealing machined channels or adding copper or other tubing to a metal base plate.

Large Diameter Heat Pipe Assemblies
function in the same manner as small diam-eter heat pipes but are capable of transferring much greater power loads because of increased interior volume and circumferential surface area.Due to the diverse nature of the applications, most large diameter heat pipes are custom fabricated and may employ different combinations of wick structures, fluid types, liquid volumes, and construction methods in order to maximize performance.

Small Diameter Heat Pipe Assemblies
provide greater thermal efficiency by embedding heat pipes into an assembly to transport heat away from a concentrated source. Heat pipes passively facilitate this transfer by employ-ing an evaporator and condenser in a closed loop mechanism,spreading heat evenly within a base or transporting it to peripheral fins. A variety of basic heat sink technologies benefit from integrating heat pipes which improve conduction paths,reduce overall weight, and raise thermal performance without increasing volume.

Fan Heat Sinks
provide significant component cooling benefits over system level fans.They incorporate a dedicated fan with a heat sink base to increase localized airflow and improving thermal efficiency. These active fan heat sinks allow for much greater thermal performance than can be achieved with an equivalent size passive solution. By matching fan performance to a variety of extrusion or other fabricated fin bases, fan heat sinks can be designed to meet specific application requirements.

High Fin Density Heat Sinks
provide increased efficiency for high power applications under forced convection by creating greater volumetric surface area and are classified into two types: High Aspect Ratio Extrusions and Fabricated Fin Assemblies. Although both types offer considerable perform-ance gains over standard extrusions, Fabricated Fin Assemblies are constructed from a base and have independent fins, which allow greater aspect ratios1than current extrusion processes.These heat sinks can be assembled using a variety of fin types such as stamped, folded, or zipper which are attached to a base using epoxy bonding, swaging, brazing, or soldering.

Extruded Heat Sinks
provide a greater range of natural convection solutions for higher power components and systems. Complex fin structures can be created by forcing raw aluminum through an extrusion die.These complex fin profiles allow greater heat dissipation through increased surface area while eliminating the cost and time associated with machining an equivalent shape from block aluminum.




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