Effect of Alumina Fiber Content on the Performance of Ceramic-matrix Friction Materials
ZHANG Xiang1,2, GAN Chunlei2,3, LI Xiaohui2,3, ZHANG Hui1, ZHENG Kaihong2,3, NONG Deng2,3
1 College of Materials Science and Engineering, Hunan University, Changsha 410082; 2 Guangdong Institute of Materials and Processing, Guangzhou 510650; 3 Guangdong Provincial Key Laboratory for Technology and Application of Metal Toughening, Guangzhou 510650;
Abstract: In the present study, cold press molding and thermocompression were carried out to prepare different contents of alumina fiber reinforced ceramic-matrix friction materials in terms of industrial waste residue fly ash as the main ceramic component. The effect of alumina fiber content on the performance of ceramic-matrix friction material was carefully studied by a constant speed friction tester. The surface morphology of specimens after wear were observed by SEM, and wear mechanism was also revealed. The results showed that with the increase of the content of alumina fiber, the porosity and density of ceramic-matrix friction materials were rising, and the hardness decreased first, then rose and again decreased slightly. The friction coefficient for alumina fiber reinforced ceramic-matrix friction materials has shown the trend of decreasing first and then rising. When the content of alumina fiber was 25%, the friction coefficient could be stable at 0.60. In addition, the addition of alumina fiber increased the wear rate of ceramic-matrix friction materials, and the wear rate increased with the increase of the content of alumina fiber. The results of SEM analysis showed that the main wear mechanism of ceramic-matrix friction material without adding alumina fiber was abrasive wear and fatigue wear. However, the main wear mechanism of ceramic-matrix friction material with adding the content of 25% alumina fiber was abrasive wear, adhesion wear and fiber brittle fracture.
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2018, Vol. 32 
