Tungsten Copper Heat Spreader
A heat sink uses its extended surfaces to increase the surface area in contact with the cooling fluid, the air for example. The term is not meant literally, as a heat sink does not have a "magical ability to absorb heat like a sponge and send it off to a parallel universe". Heat transfer theory helps explain practical aspects of how heat sinks work, and can also help to clear up common misconceptions and design mistakes. Approach air velocity, choice of material, fin (or other protrusion) design and surface treatment are some of the design factors which influence the thermal resistance, i.e. thermal performance, of a heat sink. One engineering application of heat sinks is in the thermal management of electronics, often computer CPU or graphics processors. For these, heat sink attachment methods and thermal interface materials also influence the eventual junction or die temperature of the processor(s). Theoretical, experimental and numerical methods can be used to determine a heat sink's thermal performance.
Tungsten Copper high performance composites are fabricated from carefully controlled porous tungsten that is vacuum infiltrated with molten copper. This results in a WCu composite that has high conductivity and a matched low thermal expansion for heat sinks.
High thermal conductivity
Excellent flatness, surface finish, and size control
Semi-finished or finished (Ni/Au plated) products available
Tungsten copper sheets have very high in plane conductivity provide by layers of copper and low thermal expansion provided by the inner layer of molybdenum. These laminated sheets have the ability to spread the heat from a concentrated heat source and then dissipate the heat through the layers. They Also:
Offer an economical solution to many applications
Will not delaminate and can resist repeated 850' C cycles
Available in several standard ratios and many thicknesses for tailored TE machining
Are lower weight than WCu composite materials
Are available in larger and thinner sheet size
Utilize copper that is easily plated
Can be machined by EDM
WCu composites are made by infiltrating, under vacuum, uniform controlled porous blocks of tungsten with molten co pper. This results in a material with an interconnected copper matrix that has high thermal conductivity in all axis, low thermal expansion, and good electrical conductivity, Copper content can range between 10% and 25%.
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