Publikacje

Abstract:

Nickel matrix composites reinforced with T15 high-speed steel (HSS) were prepared using powder metallurgy techniques. A systematic investigation was conducted into the effect of CeO2, MoS2, and graphite additives on the tribological properties of the composites. The results show that when T15 HSS particles are added, nickel grains do not grow as much as they do in pure sintered nickel. It was also observed that the T15 HSS particles were diffusion-bonded to the nickel matrix after sintering. The highest relative density after sintering is obtained for composites containing graphite, but the maximum hardness of 243 HV can be achieved for composites containing 2% of CeO2, which is about 16% higher than that of the Ni-T15 HSS composite. The wear rate of Ni-T15 HSS composites reduces from 3.4782 × 10−7 cm3/N·m to 2.0222 × 10−7 cm3/N·m as the content of CeO2 rises from 0 wt.% to 2 wt.%. The wear mechanisms of composites with MoS2 or graphite are abrasive wear and adhesive wear. The introduction of CeO2 enhances the hardness of the investigated composites to the highest degree, leading to a change in the wear mechanism of the composites to slight abrasive wear. The addition of CeO2 can effectively optimize the tribological properties of Ni-T15 HSS composites.

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Improving the wear properties of Ni matrix composites containing high-speed steel particles