Study of bismaleimide self-lubricating composite materials filled with α-Al₂O₃ and graphite

The bismaleimide self-lubricating composite materials filled with α-Al₂O₃ and graphite were made by casting method. The effects of α-Al₂O₃ particles content and size on tribological properties were evaluated. The morphology of wear surface and debris of the composites were studied by using scanning electron microscopy, and the wear mechanism of composite materials were also investigated. The result shows that the size of α-Al₂O₃ particles has great effect on the friction coefficient, wearability and mechanism of the composites. The tribological properties of the composites with 1500 mesh α-Al₂O₃ particles were much better than that of the composites with 1500 mesh α-Al₂O₃ particles.