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RISS 인기검색어
- 검색키워드
- 저자 : Amit Rai Dixit (검색결과 3 건)
- 무료
- 기관 내 무료
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Amit Kumar,Kamal Sharma,Amit Rai Dixit 한국탄소학회 2021 Carbon Letters Vol.31 No.2
Compared to carbon nanotubes (CNTs), graphene possesses high strength due to wrinkled surface texture caused by a high density of surface defects which benefits more contact with the polymer material than a rolled-up CNT. In the present review, we have discussed and compared the various properties of CNTs (1-D) and graphene (2-D) obtained in experimental results. The effects of covalent and non-covalent functionalization of CNTs and graphene on the properties of its composites have also been reviewed and compared. A comparative analysis has been carried out between CNTs and graphene-reinforced polymer composites. Furthermore, the synergetic effects of CNTs and graphene hybrid nanofiller on the mechanical properties of polymer composites have also been briefly discussed. Finally, this review concludes with the potential application and future challenges are discussed with regards to filler and their polymer composites.
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A Novel Additive Texturing of Stainless Steel 316 L Through Binder Jetting Additive Manufacturing
Suryank Dwivedi,Amit Rai Dixit,Alok Kumar Das,Akash Nag 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.6
The current study introduces the novel additive micro-texturing through the binder jetting additive manufacturing technique to fabricate circular micro-textured stainless steel 316L parts. The topographical analysis shows that the sample is manufactured with periodic feature sizes less than 250 μm and within an error limit of 7.62% with high metallographic purity. The wettability study indicates hydrophilic wetting behavior with contact angles in the ranges of 85.7°–82.5° for deionized water and 50.2°–36.7° for Hank’s balanced salt solution. The surface free energy for the textured part (53.484 mN/m) is improved by 72% compared to the untextured part (31.054 mN/m), leading to enhanced hydrophilicity. Further, in the scratch analysis, the textured sample shows better features intactness.
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Ravi Prajapati,Suryank Dwivedi,Deepak Kumar,Ashish Kumar Srivastava,Amit Rai Dixit 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.1
The demand for novel laminated sheets encouraged using newer technologies to produce tailored materials for multipurpose applications. An inventive solid-state joining method: friction stir additive manufacturing, which offers several advantages over traditional lamination processes. In this study, the Al2O3 powder is used as reinforcement during AA6063/Al2O3/AA6063 composites fabrication. The fabricated specimen was characterized by bonding features such as thickness reduction, metallography, mechanical properties, and tribological performances and compared with sheet lamination and base metal. The optical microscope and scanning electron microscopic images showed that the Al2O3 powder is distributed within the composites. The structural analysis at the interface of the fabricated composite was conducted through X-ray diffraction, confirming the compounds like Mg2SiO4, Mg2Al4, and Al2O3 in the crystallographic planes. The microstructural and morphological results of the laminated composite showed the refined and equiaxed grains and also depicted the dispersion of the Al2O3 powder near the stir zone. The microhardness properties were enhanced and obtained as 91.2 HV and 77.5 HV with and without reinforcement, respectively. Further, the ultimate tensile strength with and without reinforcement is improved by 36.9% and 24.7% compared to the base metal. Furthermore, the tribological analysis was performed at variable process parameters. Taguchi's L9 orthogonal array and variance analysis (ANOVA) were done to analyze the effect of individual parameters and their significance. The obtained results showed that load and frequency are significant parameters during the tribology test. The laminated composite's specific wear rate, wear depth, and COF values are less than the sheet lamination and align with ANOVA test results. Furthermore, the wear mechanism was observed, and it was found that sheet lamination has high wear at increased load when compared to laminated composite parts. Therefore, the obtained results dictate that the addition of Al2O3 powder can significantly enhance the bonding strength, mechanical and tribological properties of the fabricated composites.
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