Preparation and tribological properties of Niss/Ni3Si eutectic composite
YUAN Ya1，HAN Ming-gang1，CHEN Hui
1 School of Materials, Xianyang Vocational and Technical College, Xianyang 712000, China，2 School of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, China
Abstract：Niss/Ni3Si eutectic composites were prepared by mechanical alloying and hot pressing method, and its microstructure and tribological properties were studied. The results show that the composites are mainly composed of Niss, Ni3Si and Ni31Si12. The composites have a good combination of strength and toughness. The sintered density, hardness, bending strength and fracture toughness of the Niss/Ni3Si composites are 98.5%, 668 HV, 741 MPa and 8.92 MPa . m1/2, respectively. The composite has a low friction coefficient and wear rate. With the increase of the load, the friction coefficient of composite decreases and the wear rate rises slowly. The wear mechanism is changed from adhesive wear under low load to abrasive wear under high load. At the same time, there is an oxidation wear during the wear process.
2019, Vol. 29 
