Abstract
The effects of laser parameters and the ablation mechanism in laser ablation of a carbon fiber reinforced silicon carbide (C/SiC) composite are investigated in the present study. Six different power densities are provided, as well as six levels of pulse numbers, and then ablation experiments are conducted for the C/SiC composite, induced by a pulsed laser. Based on the experimental results, the characteristics of surface morphology and ablation behavior are discussed. It is revealed that the surface morphology of the C/SiC composite under laser irradiation usually includes three regions: the center region, the transition region, and the border region. With the increase of laser power density, the ablation of the center region becomes severe, surface cracks occur, and more spherical SiC particles are found in the transition region. As for scenarios involving multiple pulses, the damage occurs in the center region at low power density limits, within the first two layers below the surface. However, if the power density is relatively high, an ablation pit occurs in the center region when the pulse number is larger than 50. Meanwhile, the transition region and the border region diminish with increase of the pulse number. It is noted that both the power density and pulse number have noticeable effects on surface morphology and ablation behavior during laser ablation, which is helpful for material design and performance evaluation of C/SiC composites.
Highlights
IntroductionAre important for various applications, such as structural applications, environmental barrier coatings, and nuclear applications
Advanced composite materials (and carbon fiber reinforced polymer (CFRP))are important for various applications, such as structural applications, environmental barrier coatings, and nuclear applications
It is noted that both the power density and pulse number have noticeable effects on surface morphology and ablation behavior during laser ablation, which is helpful for material design and performance evaluation of carbon-fiber-reinforced silicon carbide (C/SiC) composites
Summary
Are important for various applications, such as structural applications, environmental barrier coatings, and nuclear applications This is because of their excellent properties, including having low density, extraordinary high-temperature strength, and high resistance to thermal shocks and ablation [1,2]. Composites possess many attractive characteristics, such as high fracture toughness, excellent high-temperature strength, good thermal shock and ablation resistance, as well as high reliability [3,4,5,6]. They have been widely used as combustion chambers, thruster components, and nozzles for rocket engines and heat-exchanger parts, among others [7,8,9,10]. SiC can be processed by spark plasma sintering (SPS), and can be structurally modified by ion irradiation
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