Journal
MICROMACHINES
Volume 14, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/mi14091730
Keywords
direct laser interference patterning; microstructures; heat transfer; heat sink; stainless steel; nanosecond
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This study presents a microscopic approach to increasing surface area by using periodic surface structures. The experiments show that microstructures with a periodic distance of 8.5 μm fabricated using nanosecond-pulsed infrared laser can significantly increase the surface area and improve heat dissipation efficiency.
With the increasing processing power of micro-electronic components and increasing spatial limitations, ensuring sufficient heat dissipation has become a crucial task. This work presents a microscopic approach to increasing the surface area through periodic surface structures. Microstructures with a periodic distance of 8.5 mu m are fabricated via Direct Laser Interference Patterning (DLIP) on stainless steel plates with a nanosecond-pulsed infrared laser and are characterized by their developed interfacial area ratio. The optimal structuring parameters for increasing the surface area were investigated, reaching peak-to-valley depths up to 12.8 mu m and increasing surface area by up to 394%. Heat dissipation in a natural convection environment was estimated by measuring the output voltage of a Peltier element mounted between a hot plate and a textured sample. The resulting increase in output voltage compared to an unstructured sample was correlated to the structure depth and developed interfacial area ratio, finding a maximum increase of 51.4%. Moreover, it was shown that the output voltage correlated well with the structure depth and surface area.
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