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

Yangbao Qian,Min Ge,Xi Wei,Weigang Zhang

doi:10.1007/s40145-013-0055-z

Yangbao Qian, Min Ge + Show 2 more

Open Access

https://doi.org/10.1007/s40145-013-0055-z

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Abstract

A novel braking material, C/C-ZrB2-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-ZrB2-ZrC-SiC composite showed the homogenous dispersion of three-phase ceramic as the matrix. The frictional properties of the hybrid C/C-ZrB2-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-ZrB2-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.

Highlights

Carbon/carbon (C/C) composite was first tested and replaced conventional metallic or half-metallic brake pads and discs for airplanes in the 1970s due to its excellent tribological properties, low density, high specific heat capacity, and low thermal expansion coefficient among others
The braking performance of C/C–ZrB2–ZrC–SiC composite was measured on an MM-1000 disk-on-disk type laboratory-scale dynamometer to simulate the normal landing state of aircraft brake disk friction pairs
The black zones are the carbon fibres covered with a thin pyrocarbon coating and the grey and white zones surrounding the carbon fibres are the complex ceramics

Summary

Introduction

Carbon/carbon (C/C) composite was first tested and replaced conventional metallic or half-metallic brake pads and discs for airplanes in the 1970s due to its excellent tribological properties, low density, high specific heat capacity, and low thermal expansion coefficient among others. The usual method by which SiC is introduced into porous C/C composite is liquid silicon infiltration, in which the liquid silicon reacts with the carbon matrix at high temperatures and forms SiC as the ceramic matrix. This technique has the disadvantage of producing residual silicon within the matrix of C/C–SiC composite, which results in unstable friction behaviours during braking [8,9]. Journal of Advanced Ceramics 2013, 2(2): 157–161 ensures broader adjustment of tribological properties of the resulting C/C composite and improves the oxidation resistance, both of which are highly necessary. The frictional behaviours of the composite are determined using a disk-on-disk type laboratory-scale dynamometer under both dry and wet conditions

Experiment

Results and discussion

Conclusions