engleski

Sponge-like Metal Surface Generated by Laser in the Semiconfined Configuration

A porous surface of tantalum and molybdenum plates has been formed in nanosecond laser-matter interaction in the "semiconfined configuration". Spinodal explosion of superheated liquid metal through cascade of bubblings generates a Sierpinski sponge 5-7 micrometers thick, which stays frozen permanently becouse of ultrafast cooling at the end of laser pulse. the total area of a microscale porous surface is enlarged ~ 10000 times. At even amaller scale, a different nanotube type of porosity has been observed.

laser ablation; fluid dynamics; porous metals; spinodal fluid

Art.no. 073305