TITLE:
Influencing the Crystallization of Glass-Ceramics by Ultrashort Pulsed Laser Irradiation after Nucleation
AUTHORS:
Florian Senn, Ronald Holtz, Sonja-Michaela Gross-Barsnick, Uwe Reisgen
KEYWORDS:
Glass-Ceramics, Microstructure, Nonlinear Absorption, Picosecond Laser
JOURNAL NAME:
New Journal of Glass and Ceramics,
Vol.8 No.1,
January
10,
2018
ABSTRACT: An ultra-fast laser with central wavelength at 1064nm and 10ps pulse durationwas used to tightly focus laser radiationwith a microscope objective inside the volume of nucleated Lithium Aluminosilicate (LAS) glass-ceramic. The nonlinear absorptionof the LAS glass-ceramic was measuredfor different laser parameters and a thermal simulation was performed to determine the temperature field inside the laser-modified area. After laser processing,the samples were crystallized in a furnace and the effect of the laser-induced modifications on the microstructure was analyzed with SEM. The SEM analysis shows an increase in the length and size of whisker-shapedβ-spodumene crystals in the laser-modified area. By increasing the dimension of these whisker-shaped crystals, the flexural strength of LAS can be improved locally.Firstfour-point bending flexural tests were performed to examine the influence on the mechanical properties.