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...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.展开更多
Yttrium silicate, for its high oxidation resistance, is an important candidate for protective coating for carbon-fiber-reinforced composites at temperatures above 1600 ℃. A novel method, consisting of coprecipitation...Yttrium silicate, for its high oxidation resistance, is an important candidate for protective coating for carbon-fiber-reinforced composites at temperatures above 1600 ℃. A novel method, consisting of coprecipitation, spray-drying, heat-treatment and plasma-densification, is developed to prepare Y2SiO5 powders for thermal-spraying. The composition, morphology and flowability of the synthesized Y2SiO5 powders are investigated by XRD, SEM and Hall Flowmeter, respectively. The results show that the synthesized Y2SiO5 powders are nearly spherical with high purity. The apparent density and flowability of the Y2SiO5 powders are 1.87 g/cm^3 and 37 s/50 g, respectively, which lead to a high deposition efficiency of up to 80700 for atmospheric plasma spraying.展开更多
基金This work was funded by the National Natural Science Foundation of China(Grant No.51102236).
文摘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.
基金supported by the National Fundamental Research Program (No. A1320070102)
文摘Yttrium silicate, for its high oxidation resistance, is an important candidate for protective coating for carbon-fiber-reinforced composites at temperatures above 1600 ℃. A novel method, consisting of coprecipitation, spray-drying, heat-treatment and plasma-densification, is developed to prepare Y2SiO5 powders for thermal-spraying. The composition, morphology and flowability of the synthesized Y2SiO5 powders are investigated by XRD, SEM and Hall Flowmeter, respectively. The results show that the synthesized Y2SiO5 powders are nearly spherical with high purity. The apparent density and flowability of the Y2SiO5 powders are 1.87 g/cm^3 and 37 s/50 g, respectively, which lead to a high deposition efficiency of up to 80700 for atmospheric plasma spraying.
