Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

Abstract

In this study, femtosecond laser assisted-chemical vapor infiltration (LA-CVI) was employed to produce C/SiC composites with 1, 3, and 5 rows of mass transfer channels. The effect of laser machining power on the quality of produced holes was investigated. The results showed that the increase in power yielded complete hole structures. The as-obtained C/SiC composites with different mass transfer channels displayed higher densification degrees with flexural strengths reaching 546 ± 15 MPa for row mass transfer channel of 3. The strengthening mechanism of the composites was linked to the increase in densification and formation of “dense band” during LA-CVI process. Multiphysics finite element simulations of the dense band and density gradient of LA-CVI C/SiC composites revealed C/SiC composites with improved densification and lower porosity due to the formation of “dense band” during LA-CVI process. In sum, LA-CVI method is promising for future preparation of ceramic matrix composites with high densities.

Oxidation behaviors of carbon fiber reinforced multilayer SiC-Si3N4 matrix composites

“…Carbon fiber reinforced SiC matrix composites (C/SiC) have been considered as a kind of promising hightemperature structural material [1][2][3]. They have great application potential in aero-engines, aircraft/high-speed train braking systems, and aerospace aircraft thermal protection systems due to the low density, excellent mechanical properties, and thermal shock resistance [4][5][6].…”

Effect of SiC whiskers on the anti‐oxidation properties of Yb2Si2O7/mullite/SiC tri‐layer environmental barrier coating for CMCs

“…have attracted much attention owing to their low density, high thermal conductivity, low coefficient of thermal expansion (CTE), high strength and modulus at high temperatures, and excellent mechanical properties [1][2][3][4][5][6] . Among them, carbon fiber-reinforced silicon carbide ceramic matrix composites (C f /SiC) has the highest specific strength and high service temperature, which is considered a candidate material for heat-exchanger parts, rocket nozzle, gas turbine, and so on [7][8][9] . However, the oxidation of carbon fibers and substrates in C f /SiC composites at high temperatures higher than 450 • C limits their applications in an oxygenated environment [10][11][12] .…”

Study on ablation behavior and mechanism of C/SiC composite irradiated by a laser with various parameters

“…Nowadays, the exploration of the laser ablation effect has been getting increasing attention as the high-energy laser shows a higher threat and better adjustability. [9][10][11][12][13][14][15][16] However, most of the relevant studies mainly focused on metal materials and carbon fiber-reinforced polymer composites, which with a low melting and cracking temperature, incur damage at lower temperatures. [17][18][19][20][21] Due to the low density, low coefficient of thermal expansion, high specific strength, and excellent resistance to ablation, SiC ceramic matrix reinforced by continuous carbon fibers composite (C/SiC) has been widely used as a high-temperature component.…”

“…For different ablation approaches, energy is converted from electrical or chemical energy, but all ends up as heat. Nowadays, the exploration of the laser ablation effect has been getting increasing attention as the high‐energy laser shows a higher threat and better adjustability 9–16 . However, most of the relevant studies mainly focused on metal materials and carbon fiber‐reinforced polymer composites, which with a low melting and cracking temperature, incur damage at lower temperatures 17–21 …”