▎ 摘　　要

To investigate tribological behavior of graphene reinforced chemically bonded ceramic coatings at different temperatures, tribological tests at room temperature, 200 degrees C and 500 degrees C were carried out. Results show that the fracture toughness and the hardness of the coating are improved with the introduction of graphene. Besides, the friction coefficient of the coating decreases with the addition of graphene at the room temperature and 200 degrees C. The coating without graphene achieves the similar friction coefficient at all temperatures. However, the coating with graphene achieves the lowest friction coefficient at 200 degrees C, and achieves the highest at 500 degrees C. In addition, the wear rate of the coating decreases with the increase of graphene. Besides, the wear rate at 200 degrees C is almost similar with that at room temperature. In contrast, the wear rate at 500 degrees C is much larger than those at room temperature and 200 degrees C. The mechanisms for graphene to decrease the friction coefficient and improve the wear resistance of chemically bonded ceramic coatings at evaluated temperatures are clarified.