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Open AccessFeature PaperArticle

Spark Plasma Sintering of Cobalt Powders in Conjunction with High Energy Mechanical Treatment and Nanomodification

1
Institute of Research and Development, Duy Tan University, Danang 550000, Vietnam
2
School of Materials Science and Engineering (Ret.), University of New South Wales (UNSW), Kensington, Sydney 2052, Australia
3
Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology “MISiS”, Moscow 119049, Russia
4
Engineering Centre, Plekhanov Russian University of Economics, Moscow 117997, Russia
5
Biosensor Research Institute, Department of Fine Chemistry, Seoul National University of Science and Technology (Seoul Tech.), Seoul 232, Korea
*
Author to whom correspondence should be addressed.
Processes 2020, 8(5), 627; https://doi.org/10.3390/pr8050627
Received: 24 April 2020 / Revised: 15 May 2020 / Accepted: 21 May 2020 / Published: 23 May 2020
(This article belongs to the Special Issue Synthesis and Application of Nano- and Microdispersed Systems)
Spark plasma sintering (SPS) investigations were carried out on three sets of Co specimens: untreated, high energy mechanically (HEMT) pre-treated, and nanomodified powders. The microstructure, density, and mechanical properties of sintered pellets were investigated as a function of various pre-treatments and sintering temperatures (700–1000 °C). Fine-grained sinters were obtained for pre-treated Co powders; nano-additives tended to inhibit grain growth by reinforcing particles at grain boundaries and limiting grain-boundary movement. High degree of compaction was also achieved with relative densities of sintered Co pellets ranging between 95.2% and 99.6%. A direct co-relation was observed between the mechanical properties and densities of sintered Co pellets. For a comparable sinter quality, sintering temperatures for pre-treated powders were lower by 100 °C as compared to untreated powders. Highest values of bending strength (1997 MPa), microhardness (305 MPa), and relative density (99.6%) were observed for nanomodified HEMT and SPS processed Co pellets, sintered at 700 °C. View Full-Text
Keywords: spark plasma sintering; nanomodification; mechanical processing; densification; mechanical properties spark plasma sintering; nanomodification; mechanical processing; densification; mechanical properties
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MDPI and ACS Style

Nguyen, V.M.; Khanna, R.; Konyukhov, Y.; Nguyen, T.H.; Burmistrov, I.; Levina, V.; Golov, I.; Karunakaran, G. Spark Plasma Sintering of Cobalt Powders in Conjunction with High Energy Mechanical Treatment and Nanomodification. Processes 2020, 8, 627.

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