Effect of hexagonal boron nitride and graphite on mechanical and scuffing resistance of self lubricating iron based composite

Hammes, Gisele; Mucelin, Kelen Juliane; Gonçalves, Priscila da Costa; Binder, Cristiano; Binder, Roberto; Janßen, Rolf; Klein, Aloı́sio Nelmo; Mello, José Daniel Biasoli de

doi:10.1016/j.wear.2017.01.115

Cited by 46 publications

(27 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The simultaneous addition of hBN and graphite induced an increase in the solid lubricant reservoirs homogeneously dispersed in the metallic matrix [83]. As expected, an increase in the solid lubricant reservoirs was observed when the total solid lubricant content increased, regardless of their solubility in the ferrous matrix.…”

Section: Die Pressingsupporting

confidence: 76%

“…However, for the three levels of total solid lubricant examined, a decrease in the scuffing resistance was observed as the hBN content increased [83].…”

Section: Die Pressingmentioning

confidence: 89%

“…The friction coefficient of the initial lower (2), and cementite (3). (a) 1 vol% hBN + 4 vol% C, (b) 1 vol% hBN + 9 vol% C, and (c) 2.5 vol% hBN + 7.5 vol% C (SEM) [83]. Fig.…”

Section: Die Pressingmentioning

confidence: 94%

“…A reduction in the tensile strength was observed with an increase in the total solid lubricant content. In addition, a decrease in the ultimate tensile strength (UTS) within the three levels of the total solid lubricant was observed for increased volume percentages of hBN [83]. Solid lubricant reservoirs may be considered discontinuities in the metallic matrix and have a negative influence on the mechanical properties of sintered composites [2,47,61].…”

Section: Die Pressingmentioning

confidence: 99%

“…18 Evolution of the friction coefficient with the test time, comparing the effect of the total solid lubricant amount (5, 7.5, and 10 vol%) and the effect of the hBN content (1 and 2.5 vol%). Incremental loading mode [83].…”

Section: Die Pressingmentioning

confidence: 99%

See 4 more Smart Citations

Tribological behaviour of sintered iron based self-lubricating composites

et al. 2017

Self Cite

View full text Add to dashboard Cite

This work is a review of previous works, presenting and discussing the most important results obtained by an ongoing research program towards the development of innovative, low-cost, self-lubricating composites with a low friction coefficient and high mechanical strength and wear resistance. Special emphasis is given to uniaxial die pressing of solid lubricant particles mixed with matrix powders and to metal injection moulding associated with in situ generation of solid lubricant particles. Initially, a microstructural model/ processing route (powder injection moulding followed by plasma-assisted debinding and sintering) produced a homogeneous dispersion of in situ generated solid lubricant particles. Micrometric nodules of graphite with diameter smaller than 20 μm were formed, constituting a nanostructured stacking of graphite foils with nanometric thickness. Micro Raman analysis indicated that the graphite nodules were composed of turbostratic 2D graphite having highly misaligned graphene planes separated by large interlamellae distance. Large interplanar distance between the graphene foils and misalignment of these foils were confirmed by transmission electron microscopy and were, probably, the origin of the outstandingly low dry friction coefficient (0.04). The effect of sintering temperature, precursor content, metallic matrix composition and surface finish is also reported. Furthermore, the influence of a double-pressing/double-sintering (DPDS) technique on the tribological performance of self-lubricating uniaxially die-pressed hBN + graphite-Fe-Si-C-Mo composite is also investigated. Moreover, the tribological behaviour of die-pressed Fe-Si-C matrix composites containing 5, 7.5 and 10 wt% solid lubricants (hBN and graphite) added during the mixing step is analysed in terms of mechanical properties and wear mechanisms. Finally, the synergy between solid lubricant particles dispersed in a metallic matrix and fluid lubricants in a cooperative mixed lubrication regime is presented.

show abstract

Section: Die Pressingsupporting

confidence: 76%

“…However, for the three levels of total solid lubricant examined, a decrease in the scuffing resistance was observed as the hBN content increased [83].…”

Section: Die Pressingmentioning

confidence: 89%

“…The friction coefficient of the initial lower (2), and cementite (3). (a) 1 vol% hBN + 4 vol% C, (b) 1 vol% hBN + 9 vol% C, and (c) 2.5 vol% hBN + 7.5 vol% C (SEM) [83]. Fig.…”

Section: Die Pressingmentioning

confidence: 94%

Section: Die Pressingmentioning

confidence: 99%

Section: Die Pressingmentioning

confidence: 99%

See 3 more Smart Citations

Tribological behaviour of sintered iron based self-lubricating composites

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

Tribological properties of a novel iron‐based self‐lubricating composite

Zhu,

Ahn,

Zheng

et al. 2024

Lubrication Science

View full text Add to dashboard Cite

In this work, the tribological properties of a novel iron‐based self‐lubricating composite as the tribopairs of a plunger pump were systematically studied on an end‐face tribometer, and the tribological mechanism was also revealed. The results show that the wear mechanism of the composite can be ascribed to adhesive wear when the sliding speed is lower than 1.5 m/s. As the sliding speed increases from 1.5 to 2.0 m/s, the wear type transforms to oxidative wear due to the increase of tribo‐oxidation. In addition, the failure criteria of the tribopair composite materials are summarised. When the average coefficient of friction is greater than 0.04, or the wear rate is greater than 9.66 μm3/(N m), the tribopair fails. This offers a valuable reference for industrial application of the tribopairs made from the iron‐based self‐lubricating composite.

show abstract