研究目的
To evaluate the filler content in particulate epoxy–copper composites using a laser-induced breakdown spectroscopy (LIBS) technique and to suggest a potential application for a direct and fast measurement of the filler in composites through the LIBS results using calibrated samples.
研究成果
The LIBS technique was successfully used to evaluate the filler content in particulate epoxy–copper composites, providing a fast and only surface-destructive method for direct estimation of the filler volume fraction. The study demonstrated the potential of LIBS as a quantitative technique for studying epoxy composites filled with metal particles.
研究不足
The error in the determination of filler content seems significant, and the technique is destructive on the surface. The limit of detection and error sources were analyzed, indicating potential areas for optimization.
1：Experimental Design and Method Selection:
The study utilized LIBS to analyze the filler content in epoxy-copper composites. The methodology involved preparing composites with different filler volume fractions and analyzing them using LIBS.
2：Sample Selection and Data Sources:
Composites were prepared using a system diglycidyl ether of bisphenol A (DGEBA) cured with an anhydride (MTHPA) and an accelerator (tertiary amine), with Cu powder as the filler.
3：List of Experimental Equipment and Materials:
A neodymium-doped yttrium aluminum garnet (Nd:YAG) Q-switched pulsed laser system, Model Ultra, by Big Sky Laser Technologies Inc., was used for LIBS measurements. A Model 504 monochromator by Acton Research Corporation and a Model RY-1024 PDA photodiodes arrangement by Princeton Instruments Inc. were also used.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused normal to the sample surface, with the samples continuously rotated to prevent deep crater formation. The emission of the laser-induced plasmas was collected and analyzed.
5：Data Analysis Methods:
The peaks in the LIBS spectra were fitted using a Lorentz function, and the area of each peak was obtained from the fit to estimate the filler content.
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