Preparation and characteristics of C/C composite brake disc by multi-cylindrical chemical vapor deposition processes

Abstract

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 830 – 930 °C, the gas-flow rates of N₂ and propylene were 4.8 – 5.2 m³/h and 5.8 – 6.2 m³/h, respectively, the furnace pressure was 4.5 – 5.5 kPa and the deposition time was 200 h. 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 1.02 – 1.78 g/cm³, 31 W/(m · K), 114 MPa and 7 µm/s, respectively, which are approximately similar to those of the single-cyclindrical 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.

Keywords

C/C composite brake disc / chemical vapor deposition / multi-cylindrical / mechanical property

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