Investigations on the oxidation phenomenon of SiC/SiC fabricated by high repetition frequency femtosecond laser

Abstract

SiC/SiC was processed by high repetition frequency femtosecond laser with a wavelength of 1030 nm. The experimental results were analyzed based on the finite element simulation. In the femtosecond laser ablation experiment of SiC/SiC, the processing morphologies under different laser power, repetition frequency, scanning times and scanning velocity were compared. It was found that surface oxidation is an obvious defect in the high-frequency femtosecond laser processing of SiC/SiC, which needs to be controlled. The oxidation phenomenon became more and more obvious with the increased of laser power, repetition frequency and scanning times, while it decreased with the increased of scanning velocity. The parameters of material and laser processing were input into the heat transfer module of the finite element simulation software. The simulation results could intuitively show the formation of different morphological features from the perspective of the temperature field. Finally, the surface oxidation of SiC/SiC was effectively controlled through rationally optimizing the laser processing parameters, and good morphology was obtained. The comparison between simulation and experimental results can help to understand the ablation mechanism of SiC/SiC by high-frequency femtosecond laser, and provide reference for the efficient and precise manufacture of CMC-SiC materials by pulsed laser.

Formation of Titanium Nitride, Titanium Carbide, and Silicon Carbide Surfaces by High Power Femtosecond Laser Treatment

“…Femtosecond (fs) lasers, operating on an extremely short timescale with pulses of some 10 −14 s, are usually used to form unique surface structures with tunable properties [13,14] . Femtosecond lasers have been applied to tailor the surface properties of the ultrahard materials such as titanium nitride, titanium carbides and silicon carbide as well as thin films thereof [15–21] . In these cases, laser induced periodic surface structures (LIPSS) in form of parallel lines at a periodicity roughly at the wavelength of the incident laser beam are an important structural motif formed on the surface [16–18,20,22] .…”

“…Femtosecond lasers have been applied to tailor the surface properties of the ultrahard materials such as titanium nitride, titanium carbides and silicon carbide as well as thin films thereof [15–21] . In these cases, laser induced periodic surface structures (LIPSS) in form of parallel lines at a periodicity roughly at the wavelength of the incident laser beam are an important structural motif formed on the surface [16–18,20,22] . The resulting surfaces can improve tribological properties, reduce friction or enhance biocompatibility [16,17,20] .…”

“…In these cases, laser induced periodic surface structures (LIPSS) in form of parallel lines at a periodicity roughly at the wavelength of the incident laser beam are an important structural motif formed on the surface [16–18,20,22] . The resulting surfaces can improve tribological properties, reduce friction or enhance biocompatibility [16,17,20] . Besides the post‐processing of deposited or bulk material, femtosecond laser have been applied to synthesize and/or deposit nanoparticles and films of nitrides or carbides, respectively, on substrates.…”

Experimental Study on High-Speed Milling of SiCf/SiC Composites with PCD and CVD Diamond Tools

“…), and hybrid machining methods (such as ultrasonic vibration-assisted machining, laser-assisted machining, etc.). Pulsed laser machining of SiC f /SiC composites has attracted wide attention due to the unique properties of laser in precision machining [9][10][11][12]. Liu et al [9] studied femtosecond laser processing of SiC f /SiC composites.…”

Effect of Interface Coating on High Temperature Mechanical Properties of SiC–SiC Composite Using Domestic Hi–Nicalon Type SiC Fibers

“…Continuous SiC fiber-reinforced SiC matrix composite (SiC-SiC) is known as a high-temperature resistant material, with excellent properties such as high specific strength, high specific stiffness, high temperature resistance, long-term oxidation resistance and erosion resistance. Therefore, SiC-SiC composite has a wide application prospect in the thermal protection system of aerospace vehicles and hot-end components of aircraft engines [1][2][3]. In addition, SiC-SiC composite with near stoichiometric (3rd generation) SiC fibers has high irradiation resistance, which is one of the most promising materials for structural application in nuclear fusion reactor and nuclear fission power system [4][5][6].…”