access icon free Microembossed copper microchannel heat sink for high-density cooling in electronics

A microembossed copper microchannel heat sink was designed and fabricated for high-density cooling in electronics. The microchannel width and aspect ratio were investigated to find out the optimised channel size for microembossing. The fabrication method was based on bulk copper forming including tungsten die inductively coupled plasma etching, hot copper microembossing, inlet/outlet ports punching and sealing. The heat dissipation performances were tested by ceramic heater. The maximum temperature decreased to ∼37°C under different heat fluxes, with the maximum temperature decreased by 69.2% at 50 W/cm2 heat flux. The equivalent heat transfer coefficient reached the value of 6492 W/m2 K. High-power chip was used as heat source too. The maximum heat flux reached 304.8 W/cm2 when the chip can still function properly at 90.5°C. High cooling performance with the micro-heat sink proves that microembossing by tungsten die is an alternative process for microchannel heat sink fabrication with batch production and low cost. Taking advantages of simple fabrication process and reutilisation of tungsten die, the technology shows promising potentials in high-density microcooling systems.

Inspec keywords: sputter etching; microchannel flow; heat sinks; cooling; copper; embossing; thermal management (packaging)

Other keywords: Cu; maximum temperature; inlet-outlet ports punching; high-density microcooling systems; microembossed copper microchannel heat sink; equivalent heat transfer coefficient; microchannel width; microchannel heat-sink fabrication; inlet-outlet ports sealing; temperature 90.5 degC; heat flux; heat source; high-power chip; high-density cooling; maximum heat flux; hot copper microembossing; aspect ratio; heat dissipation performances; tungsten die inductively coupled plasma etching; bulk copper

Subjects: Fluid mechanics and aerodynamics (mechanical engineering); Applied fluid mechanics; Plasma applications in manufacturing and materials processing; Forming processes; Heat and thermodynamic processes (mechanical engineering); Flows in ducts, channels, and conduits; Surface treatment and coating techniques; Product packaging; Convection and heat transfer

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2019.0198
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