Abstract:The present study aims to produce graphene nanoplatelet-coated B4C ceramic particle using semi-powder method and to investigate the effect of graphene nanoplatelets on wear and corrosion performance of Al–Si-based metal matrix hybrid composites. For this purpose, first graphene nanoplatelets at different ratios (0.25, 0.5, and 1 vol.%) were coated to the surfaces of B4C particles and then the Al–Si alloy was infiltrated into the reinforcements by gas pressure infiltration method. The characterization of graphe… Show more
“…Graphene has unique mechanical, solid lubricant and thermal properties (130 GPa fracture strength, 1000 TPa elastic modulus and 5300 W/m.K thermal conductivity). [17][18][19][20] The effects of B 4 C and graphene separately on mechanical and wear performance of Mg matrix composites were reported in our previous studies and positive influences of these reinforcements were obtained about mechanical and tribological behavior. 21,22 In this study, graphene nanoplatelets and nano-size B 4 C reinforcements were evaluated together, and hybrid composite system was obtained.…”
In this study, graphene nanoplatelets (GNPs) and boron carbide (B4C) nano reinforcements were incorporated to the pure magnesium (Mg). Powder metallurgy route was used to fabricate composite samples. Microstructures of specimens were examined and tensile, hardness, wear tests were performed to determine the mechanical and tribological performance of produced samples. The results indicate that the hardness was increased especially with the addition of 2% B4C and 0.5% GNPs reinforcements. A general trend was observed for the enhancements of yield and tensile strengths when nano reinforcements were added to the pure magnesium. The composite samples showed better wear resistance than the unreinforced sample. However, thermal conductivity began to decrease with the addition of B4C reinforcements. It is also observed that the porosity level was also higher for the composite samples.
“…Graphene has unique mechanical, solid lubricant and thermal properties (130 GPa fracture strength, 1000 TPa elastic modulus and 5300 W/m.K thermal conductivity). [17][18][19][20] The effects of B 4 C and graphene separately on mechanical and wear performance of Mg matrix composites were reported in our previous studies and positive influences of these reinforcements were obtained about mechanical and tribological behavior. 21,22 In this study, graphene nanoplatelets and nano-size B 4 C reinforcements were evaluated together, and hybrid composite system was obtained.…”
In this study, graphene nanoplatelets (GNPs) and boron carbide (B4C) nano reinforcements were incorporated to the pure magnesium (Mg). Powder metallurgy route was used to fabricate composite samples. Microstructures of specimens were examined and tensile, hardness, wear tests were performed to determine the mechanical and tribological performance of produced samples. The results indicate that the hardness was increased especially with the addition of 2% B4C and 0.5% GNPs reinforcements. A general trend was observed for the enhancements of yield and tensile strengths when nano reinforcements were added to the pure magnesium. The composite samples showed better wear resistance than the unreinforced sample. However, thermal conductivity began to decrease with the addition of B4C reinforcements. It is also observed that the porosity level was also higher for the composite samples.
“…It was determined that B 4 C appears as a needle-like structure within the magnesium alloy matrix which is constantly dissipating through regions of grain boundaries and internal grain boundaries. Because of the pinning effect, BN acts as nucleation sites and reduces grain size while causing a reduction in grain growth due to the higher proportion of grain boundary particles in the matrix alloy 26 . Figure 3 SEM image of Mg–Al–Zn Alloy composite strengthened with ( a ) 6wt% boron carbide and 3% boron nitrate, ( b ) 9wt% boron carbide and 3% boron nitrate, ( c ) XRD image of Mg–Al-Zn Alloy composite strengthened with 9% boron carbide and 3% boron nitrate, ( d ) EDAX analysis of the image of Mg–Al-Zn Alloy composite strengthened with 9% boron carbide and 3% boron nitrate.…”
Mg–Al–Zn alloys are widely preferred in many applications by considering their excellent properties of high stiffness-to-weight ratio, lightweight, high strength-to-weight ratio, low density, castability, high-temperature mechanical properties, machinability, high corrosion resistance, and great damping. Improving the properties of such alloys is challenging due to their hexagonal crystal structure and other alloying limitations. This study aims to synthesize Mg–Al–Zn alloy by incorporating the alloying elements 8.3 wt% Al, 0.35 wt% Zn on pure magnesium (Control specimen). Then synthesize Mg–Al–Zn/BN/B4C hybrid composite by reinforcing B4C at three weight proportions (3 wt%, 6 wt%, 9 wt%) along with constant solid lubricant BN (3 wt%) through a stir casting process. The hybrid composite samples were characterized and compared with the performances of the control specimen. The results reveal that 9 wt% B4C reinforced samples outperformed through recording the improvement of tensile strength by 28.94%, compressive strength by 37.89%, yield strength by 74.63%, and hardness by 14.91% than the control specimen. Apart from this, it has reduced the corrosion area (37.81%) and noticed negligible changes in density (increased by 0.03%) and porosity (decreased by 0.01%) than the control specimen. The samples were characterized using SEM, XRD, and EDAX apparatus.
“…The worn surface area was measured with the Mitutoyo SJ-410 instrument. Wv was calculated by multiplying worn surface and stroke distance [20]. Zeiss Ultra Plus Scanning Electron Microscope was used for examination of the HTCs and worn surfaces of samples after gold coating.…”
Compared to commonly use carbonaceous materials such as carbon nanotubes or graphene nanoplatelets, hydrothermal carbons (HTCs) are obtained with environmentally friendly approaches at a lower cost. Although HTCs have a wide application area such as batteries, magnetic materials, supercapacitors, adsorbent materials, etc., there are few studies on the usage of HTC as reinforcement material for composites. In this study, polyethylene matrix composites containing different amounts (0.5 wt.%, 1 wt.%, 2 wt.%) of HTCs were fabricated via the injection molding process. The effect of HTCs content on the wear properties of polyethylene matrix composites was investigated. Reciprocating wear tests were performed applying different loads at dry sliding conditions. To correlate with wear results, the mechanical properties of samples were determined by tensile and impact tests. Also, FTIR and DTA analyzes were conducted to understand the effect of HTCs on the structural and thermal properties of composites. Results show that the addition of HTCs led to the enhancement of mechanical and tribological properties of polyethylene at lower amount reinforcement ratios. Thus, it can be said that HTCs could be alternative carbonaceous reinforcement material for polymer matrix composites.
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