Effect of graphite content on wear property of graphite/Al2O3/Mg-9Al-1Zn-0.8Ce composites

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 2; pp. 207 - 211
• Main Author: 张美娟 杨晓红 刘勇兵 曹占义 程丽任 裴亚利
• Format: Journal Article
• Language: English
• Published: 01-02-2010
• Subjects: Al2O3短纤维; 复合材料性能; 氧化磨损; 短纤维增强; 石墨含量; 石墨复合材料; 石墨颗粒; 磨损性能
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60122-9

Using squeeze-infiltration technique, Mg-9Al-1Zn-0.8Ce composite reinforced by graphite particles and Al2O3 short fibers was fabricated. The reinforcing phases combined closely with the matrix and no agglomeration was observed. The microstructure, hardness and wear property of the composites with the graphite content of 5%, 10%, 15% and 20% were investigated, respectively. The results reveal that Ce tends to enrich around the boundaries of graphite particles and Al2O3 short fibers, and forms Al3Ce phase. When the graphite content increases to 20%, the grain size becomes small. Moreover, with increasing the graphite content, the microhardness of the composites decreases but the wear resistance increases. The graphite which works as lubricant during dry sliding process decreases the wear loss. At low load, the wear mechanism of the composite is mainly abrasive wear and oxidation wear; at high load, except that the composite with 20% graphite is still with abrasive wear and oxidation wear, the wear mechanism of other composites changes to delamination wear.