中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 15 No. 2 April 2005 |
mullite/ZrO2/Al2O3 composites
（1. Department of Mechanical Engineering, Nanjing Engineering Institute,
Nanjing 210007, China;
2. College of Mechanical Engineering, Tianjin University, Tianjin 300072, China;
3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences, Lanzhou 730000, China）
Abstract: The friction and wear properties of ZrO2 and Al2O3 cooperatively toughened mullite composites-mullite/ZrO2/Al2O3(MZA) were studied. The tribological tests were performed in a linereciprocating tribometer using a GCr15 steel ball on a MZA disk under different dry reciprocating sliding conditions at room temperature. A wide range of normal loads and sliding speeds were chosen to investigate the relationship between the wear mechanisms of MZA and the testing conditions. The wear mechanism diagram of MZA is constructed, it contains two typical regions. It suggests that the wear mechanisms of MZA in each of the region change from one to another depending on the wear conditions. In the mild wear region, the wear rate of MZA is 10-6mm3/m, and the wear mechanism of MZA is plastic deformation accompanied by a little micro-cracking. In the severe wear region, the wear rate of MZA is 10-5mm3/m and the dominant wear mechanism in this region is brittle fracture.
Key words: mullite/ZrO2/Al2O3; friction and wear; ceramics; wear mechanism
