研究目的
Investigating the effects of initial density during laser machining assisted CVI process and its influence on the strength of C/SiC composites.
研究成果
The lower the initial density while laser machining, the better the properties of final composites. This finding provides a better and simple method to prepare high performance C/SiC composites.
研究不足
The study focuses on the effects of initial density on the final properties of C/SiC composites after LA-CVI process, but does not explore the effects of other potential variables such as laser machining parameters or CVI process conditions.
1：Experimental Design and Method Selection:
The study employed laser-assisted chemical vapor infiltration (LA-CVI) technique to improve the density and strength of carbon fiber reinforced SiC composites (C/SiC). Two different initial densities (
2：5 and 8 g/cm3) of C/SiC composites were prepared and processed with laser machining followed by CVI process. Sample Selection and Data Sources:
The specimens were prepared via LA-CVI technique with initial densities of
3：5 g/cm3 and 8 g/cmList of Experimental Equipment and Materials:
Scanning electron microscopy (SEM, S4800, Hitachi) was used for microstructure characterization. Three-point bending strength was evaluated using INSTRON 5567 testing system. Microcomputed tomography (microCT, Y. Cheetah, YXLON, Germany) was used for detailed microstructure characteristics and density distribution.
4：Experimental Procedures and Operational Workflow:
The composites were prepared via LA-CVI technique, followed by testing of apparent density and open porosity using Archimedes’ method. Microstructure and bending strength were characterized and evaluated.
5：Data Analysis Methods:
The bending strength was computed using a specific equation based on loading force, span, width, and height of the test bar.
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