Enhanced Wear Resistance of Ni/h-BN Composites with Graphene Addition Produced by Spark Plasma Sintering
来源期刊：Acta Metallurgica Sinica2019年第7期
论文作者：Jiao Xu Dan-Qing Yi Qiang Cui Bin Wang
文章页码：876 - 886
摘 要：Ni-based self-lubricating composites containing a fixed amount of hexagonal boron nitride（h-BN）（5 wt%）and different amounts of graphene（0-1.5 wt%）were prepared by ultrasonic dispersion,high-energy ball milling,and spark plasma sintering.The effects of the graphene content on the physical,mechanical,and wear properties of the Ni/h-BN composites were evaluated.These properties were first enhanced with increasing graphene content,reaching optimal behavior for a graphene content of 1 wt%,and then degraded with further graphene addition.Compared to the pure Ni/h-BN composite,the relative density,hardness,and bending strength of the composite with 1 wt% graphene increased by 2.7%,7.4%,and6.3%,respectively,while the friction coefficient decreased by 56% to 0.31,and a reduction in wear rate by a factor of 5-15 was observed.The mechanism for improving the wear properties of the composite with added graphene was due to the formation of a graphene lubricating film on the worn surface,which increased the load bearing capacity of the surface and enhanced lubrication during wear.
Jiao Xu，Dan-Qing Yi，Qiang Cui，Bin Wang
摘 要：Ni-based self-lubricating composites containing a fixed amount of hexagonal boron nitride（h-BN）（5 wt%）and different amounts of graphene（0-1.5 wt%）were prepared by ultrasonic dispersion,high-energy ball milling,and spark plasma sintering.The effects of the graphene content on the physical,mechanical,and wear properties of the Ni/h-BN composites were evaluated.These properties were first enhanced with increasing graphene content,reaching optimal behavior for a graphene content of 1 wt%,and then degraded with further graphene addition.Compared to the pure Ni/h-BN composite,the relative density,hardness,and bending strength of the composite with 1 wt% graphene increased by 2.7%,7.4%,and6.3%,respectively,while the friction coefficient decreased by 56% to 0.31,and a reduction in wear rate by a factor of 5-15 was observed.The mechanism for improving the wear properties of the composite with added graphene was due to the formation of a graphene lubricating film on the worn surface,which increased the load bearing capacity of the surface and enhanced lubrication during wear.
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