研究目的
To investigate the use of LIBS as a technique for in-situ detection and quantification of SiC particles in liquid aluminum melts.
研究成果
LIBS demonstrated the ability to detect SiC particles in liquid aluminum, with initial tests showing a linear relationship between SiC concentration and LIBS signal. The technique shows promise for in-situ inclusion detection, though further research is needed to explore the full limits of detection and the effect of particle size distribution.
研究不足
The small size of the melt introduced turbulence, potentially affecting random sampling. The cooling presence of the probe increased liquid viscosity. Further tests with larger crucibles are needed to address these limitations.
1：Experimental Design and Method Selection:
LIBS was used to detect SiC particles in liquid aluminum. An algorithm based on the Nalimov test was employed to differentiate signals from the matrix and particles.
2：Sample Selection and Data Sources:
Pure aluminum (1070) with added SiC particles was used. Samples were prepared by casting ingots for LIBS tests and metallographic analysis.
3：List of Experimental Equipment and Materials:
A LIBS probe developed by Energy Research Company, a Q-switched Nd:YAG laser, an ESA 2802 Echelle-type spectrometer, and a Spectromax X for OES measurements.
4：Experimental Procedures and Operational Workflow:
Ingots were melted in a furnace, and LIBS measurements were taken with the probe submerged in the melt. Spectra data was analyzed for silicon signal.
5：Data Analysis Methods:
The Nalimov test was used to identify outlier signals indicating particle hits. ANOVA was performed to validate the statistical significance of the results.
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