Browsing by Author "Bhajantri, V.F."

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    An Overview of Mechanical Alloying and Conventional Metallurgical Methods
    (Springer, 2024) Bhajantri, V.F.; Kanaginahal, G.M.; Jambagi, S.
    Mechanical alloying (MA) is a powder processing technique that involves the cyclic process of cold welding, fracturing, and rewelding of powder particles within a high-energy ball mill. This method has the ability to create several forms of non-equilibrium phases, such as supersaturated solid solutions, nanocrystalline materials, metallic glasses, high-entropy alloys, and more. Materials with shape memory properties have been utilized in various applications. This article enlightens on MA and other conventional metallurgical methods. The article provides a description of the current and future applications of MA. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Factors influencing powders’ flowability and favorable phases like crystalline (Mullite and quartz) and amorphous phases of plasma-sprayed fly ash coatings suitable for marine and offshore applications
    (Elsevier B.V., 2023) Bhajantri, V.F.; Jambagi, S.C.
    Due to its rich mineralogy, fly ash (FA), an industrial waste, has been used to combat erosive, corrosive environments. Powder flowability dictates coating properties. In this investigation, raw FA powder was obtained from a thermal power plant and sieved in various sizes to assess their flowability. Powder's physical characteristics, such as specific surface area, Blaine's fineness number, and bulk density, were determined, and their influence on powder flowability was analyzed. Of these properties, bulk density affects more. Rietveld refinement was performed on the powder to quantify the phases. The powders had 45.08 ± 11.38 amorphous and 11.00 ± 2.76 % of mullite phases. Later, alumina was added between 10 and 50 wt% to FA, and samples were subjected to high-temperature X-ray diffraction at 1150 °C. A ∼32.27% rise in Mullite content was observed for 50 wt% alumina, with ∼119% decrease in the amorphous phase. Finally, one set of FA without additives coating was plasma sprayed onto a marine-grade steel substrate. The coating showed ∼17.31 ± 0.6% of mullite and ∼69.43 ± 0.6 % of the amorphous phase, with decent Mechanical properties. Therefore, 50 wt% alumina in FA powder has improved the mullite phase, bulk density (43%), and flowability by decreasing the amorphous phase content. © 2023 Society of Powder Technology Japan