研究目的
To examine the applicability of an original laser-induced breakdown spectroscopy (LIBS) setup for the determination of the surface hardness of lead glass as a function of its chemical composition.
研究成果
The study successfully demonstrated that the LIBS-based TEA CO2 laser system can accurately determine the surface hardness of lead glass samples, showing excellent linearity with Vickers hardness measurements. The method is semi-nondestructive and cost-effective, suitable for various glass types and shapes.
研究不足
The study is limited to lead glass samples with specific compositions and may not be directly applicable to other materials without further validation. The LIBS method, while less destructive than Vickers indentation, still causes minimal surface damage.
1：Experimental Design and Method Selection:
The study utilized a LIBS setup based on a TEA CO2 laser for spectrochemical analysis without sample preparation. The method involved measuring the ratio of ionic to atomic zirconium emission lines to estimate surface hardness.
2：Sample Selection and Data Sources:
Five lead glass samples with varying amounts of ZrO2 were prepared using a conventional melting-quench technique. The chemical composition of each sample was detailed.
3：List of Experimental Equipment and Materials:
Equipment included a TEA CO2 laser, a monochromator Carl-Zeiss PGS2, a CCD camera Apogee Alta F1007, and a Buehler microhardness tester model Micromet 5101 for Vickers hardness measurements.
4：Experimental Procedures and Operational Workflow:
The LIBS measurements were conducted in the air at atmospheric pressure. The laser was focused on the target, and emission spectra were recorded in the time-integrated mode. Vickers hardness tests were performed with a load of 300 gf for a dwell time of 15 s.
5：Data Analysis Methods:
The ratio of Zr(II) 355.66 nm to Zr(I) 360.12 nm emission lines was used to examine material hardness. Profilometric analysis was conducted to assess surface damage.
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