中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 26 No. 5 May 2016 |
（1. Laboratory of Mechanics, Materials and Energetic, Faculty of Technology,
University of Bejaia, 06000 Bejaia, Algeria;
2. Laboratory of Mechanics, Faculty of Engineering Sciences, Campus Chaabet-Ersas,
University of Constantine, 25000 Constantine, Algeria;
3. Mechanical Laboratory of Structure and Energetic, Mechanical Engineering Department,
University of Tizi-Ouzou, 15000 Tizi-Ouzou, Algeria;
4. Laboratory Processes for Materials, Energy, Water and Environment, Faculty of Science and Technology,
University of Bouira, 10000 Bouira, Algeria）
Abstract:The alumina composite coatings reinforced with 25% ZrO2 (denoted as AZ-25) and 3% TiO2 (denoted as AT-3) were deposited on low carbon steel using a thermal flame spraying. The microstructure, phase composition, microhardness and tribological properties of the coatings were investigated. The XRD results of the coatings reinforced by TiO2 (AT-3) revealed the presence of α-Al2O3 phase as matrix and new metastable phases of γ-Al2O3 and κ-Al2O3. However, the coatings reinforced by ZrO2 (AZ-25) consist of α-Al2O3 as matrix, q-ZrO2 and m-ZrO2. In most studied conditions, the AT-3 coating displays a better tribological performance, i.e., lower coefficient of frictions and wear rates, than the AZ-25 coating. It was also found that the microhardness of the coatings was decreased with the reinforcement of ZrO2 and increased with TiO2.
Key words: thermal spraying; coatings; reinforcements; friction coefficient; wear rate
