Friction and wear properties of nano-Si3N4/nano-SiC composite under nanolubricated conditions

Friction and wear behaviour of different concentrations of hex-boron nitride (h-BN) nanoparticles in engine oil of grade SAE 20W50 were studied at various loads. These tribological studies were conducted using a four-ball wear test machine and a pin-on-disc universal tribometer. Anti-wear properties of SAE 20W50 + h-BN were studied on the four-ball wear test machine as per ASTM D4172 standard. Friction and wear properties of SAE 20W50 + h-BN on piston ring and cylinder liner tribo-pair were studied using the universal tribometer. Nanoparticles of h-BN mixed in lubricant showed excellent tribological performance. In most of the cases, h-BN nanoparticles as additive reduced the wear loss by 30-70% at various loads. The minimum value of coefficient of friction (0.0401) was found with SAE 20W50 + 3 wt% of h-BN at normal load of 100 N. Scanning electron microscopy and Raman spectroscopy were used for characterisation of h-BN and wear scars.

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“…An important parameter that indicates the effectiveness of lubrication is the film parameter, given by Charoo and Wani

normalΛ = \frac{{normalh}_{min}}{\sqrt{{R^{2}}_{q a} + {R^{2}}_{q b}}}

where h min is the minimum film thickness and R qa and R qb is the surface roughness of the convex and concave surfaces.…”

Section: Resultsmentioning

confidence: 99%

Tribological properties of h-BN nanoparticles as lubricant additive on cylinder liner and piston ring

Charoo

Wàňi

2016

Lubr. Sci.

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“…Improving the performance of lubricant oil is an effective way to deal with this problem. In recent years, nanoparticles, such as metals, carbon materials, sulfides, and other materials, have attracted great attention because of their superior tribological properties as lubricant additives …”

Section: Introductionmentioning

confidence: 99%

The purification and tribological property of the synthetic magnesium silicate hydroxide modified by oleic acid

Gao

Chang

Wang

et al. 2018

Lubrication Science

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Modified magnesium silicate hydroxide (MMSH) nanoparticles were synthesised hydrothermally using MgO and SiO 2 as precursors and oleic acid as modification agent under alkaline condition. The tribological performances of MMSH as lubricant additives were studied. The X-ray diffraction and Fourier transform infrared spectroscopy spectra show that the synthetic MMSH nanoparticles contain no Mg (OH) 2 impurity and belong to the serpentine group. The tribological tests indicate that both MMSH and magnesium silicate hydroxide (MSH) without modification by oleic acid as additives can improve the antiwear property of base oil significantly. Meanwhile, MMSH presents better antiwear property than MSH which attributes to the formation of a tribofilm containing iron oxides, silicon oxides, graphite, Fe 3 C, FeOOH, and also organic compounds.KEYWORDS friction and wear, magnesium silicate hydroxide, oleic acid, purity

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“…The atomic radius of Ce is greater than that of Yb; therefore, conversely, the hardness of the samples with the YA additive combination is greater than that of CA. Research proved [25] that the hardness of sintered Si 3 N 4 depends on the content of α-Si 3 N 4 , density, and characteristics of the intergranular glassy phase. Therefore, a higher content of α-Si 3 N 4 , high density, and large glass hardness are beneficial for improving the hardness of Si 3 N 4 .…”

Section: Resultsmentioning

confidence: 99%

Study of the Comparative Effect of Sintering Methods and Sintering Additives on the Microstructure and Performance of Si3N4 Ceramic

et al. 2019

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The Si3N4 ceramics were prepared in this study by gas pressure sintering (GPS) and spark plasma sintering (SPS) techniques, using 5 wt.% Yb2O3–2 wt.% Al2O3 and 5 wt.% CeO2–2 wt.% Al2O3 as sintering additives. Based on the difference in sintering methods and sintering additive systems, the relative density, phase composition, phase transition rate, microstructure, mechanical properties, and thermal conductivity were comparatively investigated and analyzed. SPS proved to be more efficient than GPS, producing higher relative density, bending strength, hardness, and thermal conductivity of Si3N4 ceramic with both additive systems; however, the phase transition rate and fracture toughness were lower. Similarly, higher bending strength, hardness, and thermal conductivity were achieved with Yb2O3–Al2O3 than CeO2–Al2O3 in the case of GPS and SPS, and only the relative density, fracture toughness, and phase transition rate were lower.

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Friction and wear properties of nano-Si3N4/nano-SiC composite under nanolubricated conditions

Cited by 15 publications

References 25 publications

Tribological properties of h-BN nanoparticles as lubricant additive on cylinder liner and piston ring

Tribological properties of h-BN nanoparticles as lubricant additive on cylinder liner and piston ring

The purification and tribological property of the synthetic magnesium silicate hydroxide modified by oleic acid

Study of the Comparative Effect of Sintering Methods and Sintering Additives on the Microstructure and Performance of Si3N4 Ceramic

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