Synthesis and characterization of nano hexagonal boron nitride powder and evaluating the influence on aluminium alloy matrix

Pillari, Lava Kumar; Umasankar, V.; Elamathi, P.; Chandrasekar, Govindasamy

doi:10.1016/j.matpr.2016.04.104

Cited by 11 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The FTIR spectrum ( Figure 2) shows two distinct modes at 767.14 and 1324.85 cm −1 , both attributed to the sp 2 bonded h-BN according to Aradi et al [32]. The mode at 767.14 cm −1 represents the A1u out-of-plane bending vibration whereas the mode at 1324.85 cm −1 is the E1u in-plane stretching vibration for h-BN [32][33][34]. In addition, the Raman spectrum of the h-BN nanopowders (Figure S1) shows the typical mode of hexagonal boron nitride at 1367 cm −1 .…”

Section: Methodsmentioning

confidence: 90%

Tribological and Thermophysical Properties of Environmentally-Friendly Lubricants Based on Trimethylolpropane Trioleate with Hexagonal Boron Nitride Nanoparticles as an Additive

et al. 2019

View full text Add to dashboard Cite

Dispersions based on hexagonal boron nitride, h-BN, nanoparticles, at 0.50, 0.75 and 1.0 wt.% mass concentrations, in an ester base oil composed mainly of trimethylolpropane trioleate, were investigated as potential nanolubricants. The stability of the dispersions was assessed to determine the reliability of the tribological, thermophysical and rheological measurements. Density and viscosity were measured from 278.15 to 373.15 K, while rheological behavior was analyzed at shear rates from 1 to 1000 s −1 at 283.15 K. Newtonian behavior was exhibited by all nanolubricants at the explored conditions, with the exception of the highest concentration at the lowest shear rates, where possible non-Newtonian behavior was observed. Tribological tests were performed under a normal load of 2.5 N. Wear was evaluated by means of a 3D profiler, scanning electron microscopy and confocal Raman microscopy. The best tribological performance was achieved by the 0.75 wt.% nanolubricant, with reductions of 25% in the friction coefficient, 9% in the scar width, 14% in the scar depth, and 22% of the transversal area, all with respect to the neat oil. It was observed that physical protective tribofilms are created between rubbing surfaces.Coatings 2019, 9, 509 2 of 17 relatively weak van der Waals interactions between loosely stacked h-BN sheets that provide excellent lubrication characteristics [9]. h-BN, the softest and most lubricious polymorph of BN, has both high thermal stability and thermal conductivity as well as numerous industrial applications, especially in metalworking processes where cleanliness of the working environment is required [10][11][12]. Additionally, h-BN is an environmentally-friendly material [13], which is being studied as a nanoadditive for liquid lubricants [14-22] because, compared with solid lubricants, liquid lubricant additives present advantages such as faster entrance and replenishment of the sliding interface, and easier removal of wear debris from the contact zone [23].With respect to the tribological behavior of nanolubricants containing h-BN nanoparticles, Mosleh et al. [14] found that when nanoparticles of h-BN, with irregular flake-like shapes and an average size of 70 nm, were dispersed in commercial sheet metal forming fluids, the friction coefficient for titanium-steel pairs showed little or no improvement; nevertheless, the wear reduction using the 1 wt.% h-BN nanodispersion was 55%. Çelik et al. [15] found that an engine oil (Society of Automotive Engineers (SAE) 10 W) containing h-BN nanoparticles of disk-like shape with an average diameter of 114 nm and thickness of 30-70 nm, led to a 14.4% improvement in the friction coefficient and a 65% decrease in the wear rate with respect to the neat oil for an AISI 4140 steel material. Wan et al. [16] studied nanolubricants composed of a formulated oil 15W-40, a dispersant, and h-BN nanoparticles (disks with average diameter of 120 nm and a single layer thickness of around 30 nm), finding that the nanolubricants with low nanoparticle concentrations s...

show abstract

Section: Methodsmentioning

confidence: 90%

Tribological and Thermophysical Properties of Environmentally-Friendly Lubricants Based on Trimethylolpropane Trioleate with Hexagonal Boron Nitride Nanoparticles as an Additive

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In addition, the high densifications of the sintered matrix and its hybrid composites an indication of the effectiveness of the applied production processes, such as the coating, mechanical mixing, and hot-coining process (temperature, time, and pressure) as well as the size and distribution of the ceramic particles to produce the high-density Al-0.6 wt.% CNTs/h-BN hybrid nanocomposites close to the full densifications. Furthermore, the nanohybrid reinforcements had higher compressive properties compared to Al-matrix [33,48,51,52]. Although the relative density of the prepared nano composites decreases by increasing the h-BN ratio, it is still very high in which the lowest value is ~ 93% for 10% h-BN which is the good densification.…”

Section: Density Of the Al-cnts/h-bn Hybrid Compositesmentioning

confidence: 96%

Enhancement of microstructural, mechanical and tribological properties of hybrid Al- CNTs through electroless deposition of innovative h-BNs contents coated Ag and Ni for purpose of ball bearing

Barakat,

Samir,

Elkady

et al. 2024

Preprint

View full text Add to dashboard Cite

Ball bearings face numerous challenges under harsh operating conditions of elevated pressure between the balls and other contacting parts of the bearing like drop in tribological properties. To address these challenges, a new attempt was successfully made for the first time in this paper through an experimental investigation by the impact of incorporating hexagonal boron nitride (h-BN) into Aluminum-Carbon nanotubes (Al-0.6 wt. % CNTs) nanocomposites by an innovative coated with silver (Ag) and nickel (Ni) using a novel electroless chemical deposition technique, to improve the wettability and scattering between matrix and reinforcement. Various h-BN ratios (2, 4, 6, 8 and 10 wt. %) are incorporated and consolidated through high-energy ball milling and hot compaction techniques. The produced samples were tested and analyzed physically, mechanically, tribologically, and microstructurally. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses were used to explore the new morphologies and structures. The study delves into density, hardness, and wear resistance. The optimal h-BN content is determined to be 8 wt.%, enhancing wettability and dispersion within the Al-CNTs matrix. Thus, the properties of hardness, compressive strength, wear rate, and COF at 8 wt.% of h-BN content were enhanced by 105%, 60%, 74.5%, and 78.5%, respectively, compared to pure Al. This is due to the uniform scattering of h-BN nanoparticles across the entire surface, despite a significant decrease in relative density. In conclusion, the combination of high-energy ball milling, electroless deposition, and hot compaction techniques proves to be effective in producing Al-CNTs/h-BN nanocomposites coated with Ag and Ni nanoparticles.

show abstract

“…Additional band appeared at 2318 cm -1 is due to moisture absorbed on the samples during the analysis. Based on the literature on infrared studies of B-C structures, the distinctive peaks of B-C bonds are those at 891, 1056, 1233, 1368, 1538, 1785 cm −1 [19,20].…”

Section: Characterization Of Boron Nitride and Boron Carbidementioning

confidence: 99%

“…Moreover, it is seen that boron nitride is agglomerated and in bulk. Energy dispersive X-ray spectroscopy (EDX) makes quantitative characterization of the sample for all elements except for those with lower atomic numbers which includes boron as well as nitrogen [20,21]. EDX analysis often provide important information about the percentage of materials, their distribution, shape and morphology.…”

Section: Fig 2 Ftir-atr Spectra Of a Boron Nitride And B Boron Carbidementioning

confidence: 99%

Hydrogen Production and Its Storage from Solar Energy

Doğan

2020

Advances in Materials Science

View full text Add to dashboard Cite

AbstractThe aim of this study is to increase the energy efficiency of the solar panel, to make the waste heat generated under the panel efficient and to store the electrical energy produced from solar panels in the form of hydrogen in boron nitride and boron carbide. Characterization of boron nitride and boron carbide was carried out with Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR), differential thermal and thermogravimetric analysis (DTA/TG), Brunauer–Emmett–Teller (BET) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM/EDX). The specific surface areas and pore sizes of the boron nitride and boron carbide were determined as 78 and 20 m2/g; and 3.8 and 11.1 nm, respectively. DTA/TG thermograms showed that boron nitride degraded in one step in the temperature range of 30-550°C and boron carbide degraded in two steps. From experimental studies, approximately 8.7% energy efficiency was achieved and hydrogen energy was costless produced from a renewable energy source excluding system costs. Moreover, it was found that 276% and 208% more hydrogen could be stored in the boron compounds, the boron nitride had more hydrogen storage capacity, and the electrical efficiency of the panel was increased.

show abstract

Synthesis and characterization of nano hexagonal boron nitride powder and evaluating the influence on aluminium alloy matrix

Cited by 11 publications

References 7 publications

Tribological and Thermophysical Properties of Environmentally-Friendly Lubricants Based on Trimethylolpropane Trioleate with Hexagonal Boron Nitride Nanoparticles as an Additive

Tribological and Thermophysical Properties of Environmentally-Friendly Lubricants Based on Trimethylolpropane Trioleate with Hexagonal Boron Nitride Nanoparticles as an Additive

Enhancement of microstructural, mechanical and tribological properties of hybrid Al- CNTs through electroless deposition of innovative h-BNs contents coated Ag and Ni for purpose of ball bearing

Hydrogen Production and Its Storage from Solar Energy

Contact Info

Product

Resources

About