Frictional response of a novel C/C-ZrB2-ZrC-SiC composite under simulated braking

Abstract

Abstract:A novel braking material, C/C-ZrB 2 -ZrC-SiC carbon fibre-reinforced hybrid ceramic matrix composite, was prepared by chemical vapour infiltration and polymeric precursor infiltration and pyrolysis. Investigation of the microstructure of C/C-ZrB 2 -ZrC-SiC composite showed the homogenous dispersion of three-phase ceramic as the matrix. The frictional properties of the hybrid C/C-ZrB 2 -ZrC-SiC ceramic matrix composite were measured by a disk-on-disk type dynamometer under dry and wet conditions to simulate the normal landing state of aircraft brake disk friction pairs. C/C-ZrB 2 -ZrC-SiC ceramic matrix composite has a higher and more stable friction coefficient under wet condition than under dry condition, indicating that the composite has better performance compared with C/C or C/C-SiC braking materials.

Enhanced thermal conductivity and mechanical properties of 2D C f/SiC composites modified by in-situ grown carbon nanotubes

“…They are characterized by low density, high specific strength and stiffness, excellent high-temperature mechanical properties, elevated temperature resistance, outstanding oxidation resistance, and good chemical and thermal shock stability [4,5]. Consequently, these composites have been widely used in aviation and aerospace engine hot-end components [6,7], thermal protection systems for space shuttles [8−10], space mirrors [11], and high-speed braking devices [12−14]. Currently, C f /SiC composites are the preferred thermal protection structural materials for key parts of newgeneration hypersonic vehicles, such as nose cones, wing leading edges, and flaps [15].…”

Self-Lubricating Effect of WC/Y–TZP–Al2O3 Hybrid Ceramic–Matrix Composites with Dispersed Hadfield Steel Particles during High-Speed Sliding against an HSS Disk

“…High-speed sliding usually means unlubricated sliding at speeds in the range of 5-90 m/s and only a limited number of materials can be capable of sustaining that harsh condition [7][8][9][10][11][12][13][14][15][16][17][18][19]. Those may be hybrid sliding pairs with ceramics, ceramic matrix (CMCs), or metallic matrix (MMCs) composites rubbed against hardened alloyed steel counterbodies [7][8][9][10][11][12][13][14][15][16][17][18][19]. It is worthwhile noting that despite temperatures as high as 1500-3000 • C that the melted Hadfield steel.…”

Sol-gel derived porous ultra-high temperature ceramics

“…The processing routes used for the production of porous ceramics can be categorized as partial sintering, replica method, sacrificial template method, and direct foaming method [28][29][30][31][32]. It is important to get a well dispersed ceramic slurry or liquid precursor for the fabrication of porous ceramics with tailored microstructure and chemical composition [33][34][35]. Porous UHTCs can be obtained by using ceramic powders as raw materials, followed by colloidal processing (e.g., freeze casting, gel casting, and foaming) of the ceramic slurry, shaping, and pressureless sintering [17,18,27].…”