Forming technology of boiling structure on evaporation surface of phase-change heat sink for high-power light emitting diode

Abstract

Boiling structures on evaporation surface of red copper sheet with a diameter (D) of 10 mm and a wall thickness (h) of 1 mm were processed by the ploughing-extrusion (P-E) processing method, which is one part of the phase-change heat sink for high power (HP) light emitting diode (LED). The experimental results show that two different structures of rectangular- and triangular-shaped micro-grooves are formed in P-E process. When P-E depth (a_p), interval of helical grooves (d_p) and rotation speed (n) are 0.12 mm, 0.2 mm and 100 r/min, respectively, the boiling structures of triangular-shaped grooves with the fin height of 0.15 mm that has good evaporation performance are obtained. The shapes of the boiling structures are restricted by d_p and a_p, and d_p is determined by n and amount of feed (f). The ploughing speed has an important influence on the formation of groove structure in P-E process.

Keywords

phase-change heat sink / boiling structure / high power light emitting diode / ploughing-extrusion

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