【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 o
【机 构】
：
School of Material Science and Engineering, Central South University, Changsha 410083, China;Light A
论文部分内容阅读
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％,and 6.3％,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.
其他文献
This work discusses tribological properties of commercial pure (CP) titanium processed by multi-directional forging (MDF) up to six passes at room temperature and 220 ℃.For this purpose,wear test was conducted by dry sliding pin-on-disk method on the init
The microstructural evolution of pure nickel treated by deep rolling (DR) technique with different indent depths was investigated by means of optical microscopy and transmission electron microscopy.The surface roughness,hardness and residual stress distri
The synergistic effect of NaC1 and SO2 on the atmospheric corrosion of zinc has been studied at equivalent total but different ratios of molar deposition rate under wet-dry cyclic conditions.The results show that the corrosion rates,corrosion morphologies
Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications.316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applications.The existence of crevices will resu
The present work describes the effect of deposition potentials on structural,morphological,optical,electrical and photoconductivity responses of cuprous oxide (Cu2O) thin films deposited on fluorine-doped tin oxide glass substrate by employing electrodepo
The surface of AISI 1045 steel specimens was modified via two duplex surface treatments of (i) titanium diffusion coating followed by plasma nitriding (Ti-PN) and (ii) plasma nitriding followed by titanium diffusion coating (PN-Ti).A comparative study on
Type I hot corrosion behavior of SiO2-Al2O3-glass composite coating based on Ti-47Al-2Cr-2Nb substrate was investigated in the mixture salt of 25 wt％NaCl + 75 wt％Na2SO4 at 850 ℃.The results showed that there was a bidirectional ion exchange between compos
Mg-Zn-Zr series Mg alloys (ZK) are one of the most important commercial Mg alloys due to their good comprehensive mechanical properties.The phase equilibria of the Mg-Zn-Zr system at 400 ℃ covering the overall composition range were investigated by X-ray
In the present study,a quenching treatment prior to two-stage heat treatment was conducted on a Fe-0.28C-1.55Mn-2.06Al transformation-induced plasticity steel to tailor the final microstructure.Compared with the microstructure of the ferrite,bainite and b
The damage behaviors of a titanium matrix composite shaft under torsion loading were monitored using the acoustic emission technique.The composite shaft with SiC fibers at ± 45° orientations was prepared by the solid-state fabrication process.Both the tor