The C/C composite brake discs were prepared by tri-cylindrical chemical vapor deposition （CVD） process. The optimum processing parameters were as follows: deposition temperature was 830930℃, the gas-flow rates of...The C/C composite brake discs were prepared by tri-cylindrical chemical vapor deposition （CVD） process. The optimum processing parameters were as follows: deposition temperature was 830930℃, the gas-flow rates of N2 and propylene were 4.85.2m3/h and 5.86.2m3/h, respectively, the furnace pressure was 4.55.5kPa and the deposition time was 200h.The effects of processing parameters on the densified rates, thermal-physical property and mechanical performance of C/C composite brake discs were studied. The results show that density, heat conductivity, bend strength and abrasion ratio of the multi-cylindrica brake discs are 1.021.78 g/cm3, 31W/（m·K）, 114MPa and 7μm/s, respectively, which are approximately similar to those of the single-cylindrical ones. The gas flow rate has no relation to the number of the cylinder and furnace loading. The utilization ratio of carbon can be improved by multi-cylinder CVD process without changing the characteristics of brake disc.展开更多
文摘The C/C composite brake discs were prepared by tri-cylindrical chemical vapor deposition （CVD） process. The optimum processing parameters were as follows: deposition temperature was 830930℃, the gas-flow rates of N2 and propylene were 4.85.2m3/h and 5.86.2m3/h, respectively, the furnace pressure was 4.55.5kPa and the deposition time was 200h.The effects of processing parameters on the densified rates, thermal-physical property and mechanical performance of C/C composite brake discs were studied. The results show that density, heat conductivity, bend strength and abrasion ratio of the multi-cylindrica brake discs are 1.021.78 g/cm3, 31W/（m·K）, 114MPa and 7μm/s, respectively, which are approximately similar to those of the single-cylindrical ones. The gas flow rate has no relation to the number of the cylinder and furnace loading. The utilization ratio of carbon can be improved by multi-cylinder CVD process without changing the characteristics of brake disc.
