Comparative study demonstrates superior drilling efficiency and wear resistance in ceramic matrix composites, indicating reduced thermal oxidation from water cooling.
Water-jet guided laser (WJGL) processing provides an effective technology for the precision machining of ceramic matrix composites (CMCs), particularly for high-aspect-ratio microhole drilling, owing to its advantages in energy confinement, cooling, and debris removal. In this study, WJGL processing and dry nanosecond laser processing were systematically compared for the drilling of C f /SiC composites under comparable laser conditions. The results show that the introduction of water significantly modifies the laser-material interaction by providing cooling and debris removal, thereby reducing thermal accumulation and subsequent oxidation. By optimization of water pressure, microholes with a minimum diameter of 200 μm and a maximum aspect ratio of 15:1 were successfully fabricated. Compared with dry nanosecond laser processing, WJGL achieved a higher material removal rate while markedly suppressing thermal oxidation at the cross section, thus preserving the integrity of both the SiC matrix and the BN interface. Consequently, the WJGL-processed C f /SiC composites show significantly improved wear resistance compared to the dry nanosecond laser-processed ones due to the reduced surface damage.
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Wang et al. (2026) studied this question.
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