Using laser radiation for the formation of capillary structure in flat ceramic heat pipes

The possibility of using laser radiation with a wavelength of 1.064 $\mu$m for the formation of a capillary structure in the evaporation zone of flat ceramic heat pipes has been experimentally confirmed. Using a technological regime with established parameters, a capillary structure was formed in AlN and Al$_2$O$_3$ ceramic plates with a thickness of 1–2 mm and lateral dimensions of 48 $\times$ 60 and 100 $\times$ 100 mm, which ensured absorption of heat-transfer fluids (distilled water, ethyl alcohol, acetone) to a height of 100 mm against gravity forces. The thermal resistance of flat ceramic heat pipes with this capillary structure reaches 0.07$^\circ$C/W, which is quite acceptable for their use as heat sinks in systems of thermal regime control for electronic components and as heat exchange plates for large-size thermoelectric conversion units.