Abstract
An ultra-fast laser with central wavelength at 1064 nm and 10 ps pulse duration was used to tightly focus laser radiation with a microscope objective inside the volume of nucleated Lithium Aluminosilicate (LAS) glass-ceramic. The nonlinear absorption of the LAS glass-ceramic was measured for 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-shaped β-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. First four-point bending flexural tests were performed to examine the influence on the mechanical properties.
Highlights
One advantage of laser radiation is the possibility to deposit energy on a very small and well defined area
Because no thermal data of nucleated Lithium Aluminosilicate (LAS) glass-ceramic were available, the values for conductivity and diffusivity were taken from soda-lime glass (SLG) [15] with K = 1.005 W/(m∙K) and α = 4.365 × 10−7 m2/s
It was possible to show that the treatment of nucleated LAS samples with USP laser radiation leads to a change in the microstructure after the crystallization process
Summary
One advantage of laser radiation is the possibility to deposit energy on a very small and well defined area. This effect was used in [1] to show the feasibility of gradual and partial crystallization of glass-ceramics using continuous wave (CW) laser radiation. Due to the use of CW laser radiation, the crystallization process could only be started from the body surface
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