Department of Mechanical engineering
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Item Fabrication and tribo-mechanical performance of Cu@Al2O3 composite(Elsevier, 2022) Belgamwar, Sachin U.In this work, Al2O3 reinforced Cu matrix (Cu@Al2O3) composite has been prepared by electro-co-deposition (ECD) technique followed by powder metallurgy (PM). The microstructure, micro-surface morphology and composition of prepared Cu@Al2O3 composite powder were examined by XRD, SEM and EDS, respectively. According to the XRD, SEM and EDS analyses, the Cu@Al2O3 composite powder comprised Cu, Al and O elements and had a crystallite size of ∼ 24 nm. The microhardness and coefficient of friction (COF) of Cu@Al2O3 composite were measured by a digital hardness tester and pin-on-disk tribometer, respectively. It was observed that reinforcement of Al2O3 into the Cu matrix increased the microhardness by ∼ 35% and decreased the COF by ∼ 28% compared to the pure copper sample. The co-deposition of Al2O3 with Cu significantly reduced the crystallite size of the composite, resulting in improved microhardness and COF. The experimental results indicate that a modified ECD technique is a facile and scalable technique to prepare Cu@Al2O3 composite.Item Preparation of novel Zn/Gr MMC using a modified electro-co-deposition method: Microstructural and tribo-mechanical properties(Elsevier, 2021) Rathore, Jitendra S.; Belgamwar, Sachin U.Zinc is a well-suited low-cost and widely alloyed metal used in several metal matrix composites (MMCs) due to its easy availability, low melting point, excellent thermal and electrical properties. However, Zn metal alone is a low strength material which restricts its applications mostly for alloying purpose. Inclusion of graphene nano-reinforcements in Zn metal matrix could result in high strength and cost-effective nanocomposite material. In this paper, impermeable graphene nano-reinforcements are encapsulated in Zn metal matrix using a modified electro-co-deposition method followed by powder metallurgy. The uniform distribution of nano-reinforcement of graphene layers across the Zn metal matrix was achieved. The prepared nanocomposite was characterized and tested to evaluate the microstructural, morphological and tribo-mechanical properties. The graphene content in Zn matrix decreased the crystallite size and imparted the advantageous grain strengthening effect. The graphene reinforced Zn MMC sample showed a significant enhancement in the mechanical and tribological properties than that of pure Zn sample.Item Synergistic electro-co-deposition and molecular mixing for reinforcement of multi-walled carbon nanotube in copper(Elsevier, 2013-12) Belgamwar, Sachin U.Carbon nanotube-reinforced copper composite powder was prepared by a modified electro-co-deposition method that was carried out on small diameter (3 mm) tip of the cathode. The deposition was done at room temperature and atmospheric pressure. Samples were prepared under constant stirring by a magnetic stirrer. Transmission and scanning electron microscopy confirms the dispersion of multiwalled carbon nanotubes (MWCNT) in the copper matrix. Dispersion of MWCNTs in copper matrix by this method is very easy and the set up can be easily scaled up for the bulk production of MWCNT reinforced copper powder. The method for the fabrication of MWCNT reinforced copper powder; microstructure and morphology of the powder formed are reported.Item Investigation on electrical properties of Cu matrix composite reinforced by multi-walled carbon nanotubes(Elsevier, 2019) Belgamwar, Sachin U.Multi-walled Carbon nanotubes (MWCNTs) have been considered as an ideal reinforcing element to improve the electrical properties of many materials. In this paper, we report the results on synthesis and calculation of electrical resistivity and specific conductivity of copper matrix reinforced with multi-walled carbon nanotubes. Cu/MWCNTs composite was synthesized by the electro-co-deposition method. Based on the experimental results, we determined the electrical resistivity and specific conductivity of the Cu/MWCNTs composites. The morphological and structural properties of prepared composite powder were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) testing respectively. Test results shows that, specific conductivity of the composite is increased by 20.26 % compared to that of pure Cu.Item Non-cytotoxic zinc/f-graphene nanocomposite for tunable degradation and superior tribo-mechanical properties: Synthesized via modified electro co-deposition route(Elsevier, 2023-03) Rathore, Jitendra S.; Belgamwar, Sachin U.Zinc (Zn) alloys and composites have recently been recognized as potential biodegradable materials for bone implants and vascular stents. Although new class of Zn-based materials have superior mechanical integrity than polymeric materials during biodegradation, the reinforcement of biocompatible form of graphene nanoplatelets (GNPs) in Zn matrix can be utilized to further enhance their effectiveness for loadbearing implants. In this work, pristine GNPs were functionalized with polyethelene glycol to reduce their toxicity and reinforced in Zn matrix using modified electro co-deposition (M-ECD) method. The influence of various concentrations of functionalized GNPs (f-GNPs) in ECD bath on microstructure, interface bonding of functional groups, morphology, and elemental composition, corrosion resistance, and tribo-mechanical behavior of Zn/f-GNP nanocomposite have been studied. The Zn/f-GNP nanocomposites were also screened systemically for biological responses by in-vitro cytotoxicity and antibacterial studies. The nanocomposite sample of 100 mg/L of f-GNPs concentration in ECD bath has demonstrated a uniform slow in-vitro degradation rate of 26 ± 0.8 × 10−3 mm/year. The primary degradation products included zinc oxide [ZnO], zinc hydroxide [Zn(OH)2], and simonkolleite [Zn5(OH)8Cl2H2O] observed from x-ray diffraction of corroded nanocomposites. The microhardness, compressive yield strength and ultimate compressive strength of Zn/f-GNP (100 mg/L) nanocomposite were 108.5 HV, 284.9 MPa, and 292.6 MPa, respectively, which were significantly higher than pure Zn. In addition, the good in-vitro human keratinocyte cell viability and effective antibacterial activity of Zn/f-GNP nanocomposite render it a very attractive biodegradable implant material for future implication in orthopedic fixation (screw, pins, sutures, and plates) and stents (coronary and cardiovascular stents) applications.Item Development and characterization of Cu-Gr composite coatings by electro-co-deposition technique(Elsevier, 2020) Rathore, Jitendra S.; Belgamwar, Sachin U.Graphene nanoplatelets (Gr) are considered as promising reinforcing elements in the composite coatings owing to its exceptional mechanical, electrochemical, electrical, and thermal properties. In the present work, Cu-Gr composite coatings were deposited on stainless steel substrate from the electrolyte bath containing different concentrations of Gr using the electro-co-deposition technique. The microstructure and phases of the Cu-Gr composite coating were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Energy dispersive x-ray spectroscopy (EDS). Microhardness tester was employed to calculate the microhardness. The experimental results show that the surface morphology and microstructure of the Cu-Gr composite coatings are significantly affected by the reinforcement of Gr. The microhardness of the Cu-Gr (0.2 g/L) composite coating is enhanced by 21.42% compared to the pure Cu coating.