Abstract:

Multiple degrees cBN bionic wearresistant composites were prepared by spark plasma sintering. The microstructure of the composites was investigated by means of image analyzer, scanning electron microscope (SEM) and Xray diffraction (XRD) analysis. The results show that Cubased alloy exhibits good wettability to cBN monocrystal grains. The interface of Cubased alloy /cBN was compact and a reaction layer is formed between them. Microanalyses have shown Ti in Cubased alloy transferred preferentially to the surface of the cBN monocrystal grains and reacted with N and B elements forming TiB2 and TiN near the interface, which realized metallurgical bonding between Cubased alloy and cBN monocrystal grains. In the process of abrasion, relative protuberance of cBN grains formed nonsmooth surface, which resist wear of abrasion grains. The abrasion performance of the cBN bionic wearresistant composites is 14.73 times of which of quenching 45 steel in equivalent condition.

Key words: composite materials, wear resistance, microstructure, spark plasma sintering