Oxidation behavior of 2D C/SiC composite modified by SiB4 particles in inter-bundle pores

Improvement of the mechanical and thermophysical properties of C/SiC composites fabricated by liquid silicon infiltration

“…Chemical vapor infiltration (CVI) and liquid silicon infiltration (LSI) are usually applied to fabricate C/SiC [1][2][3][4][5][6][7]. For C/SiC fabricated by CVI, large amount of pores usually exist due to the bottle-neck effect, and the residual porosity is in a range of 10-15 vol.% [1], resulting in the decrease of thermal conductivity and Young's modulus.…”

“…Carbon fiber reinforced SiC matrix composites (C/SiC) have been extensively studied as promising candidates for high-temperature application [1][2][3][4][5][6][7]. Chemical vapor infiltration (CVI) and liquid silicon infiltration (LSI) are usually applied to fabricate C/SiC [1][2][3][4][5][6][7].…”

Synergistic effects induced by oxy-fluorination of carbon preforms to improve the mechanical and thermal properties of carbon–carbon composites

“…These results can be attributed to the thermal properties of the base carbon preforms of the composites, because the order of the stability is the same to that of the carbon preforms. In addition, there are studies that have reported that the anti-oxidation of composites depends on the voids, pores, and interfacial cracks of the C/C composites [4,[29][30][31]. The improved anti-oxidation could be attributed to improved adhesion, which results in fewer pores, voids, and interfacial cracks, because the strong interfacial adhesion prevents the diffusion of oxygen gas inward in the C/C composites.…”

Oxidation behavior of SiBC matrix modified C/SiC composites with different PyC interphase thicknesses

“…However matrix pores exist in C/SiC composites due to the "bottom-neck effect" during CVI process, which will act as diffusion paths of oxidizing species, restricting the application of C/SiC composites in oxidation environment. Liquid silicon infiltration (LSI), slurry infiltration and their combination have been used to produce dense C/SiC composites to fill the matrix pores by Si [6,7] or self-healing components such as B 4 C, SiB 4 , and SiBC [8][9][10][11][12]. The porosity of dense C/SiC composites is effectively reduced to less than 5% but higher processing temperature (41420 1C) aggravates the mismatch between coefficient of thermal expansion (CTE) of the fiber and matrix and brings larger thermal residual stress (TRS) on the composites, resulting in the formation of intrinsic matrix micro-cracks while cooling down from the fabrication temperature to room temperature [13][14].…”