Effect of sintering temperature on the structure and magnetic properties of SmCo5/Fe nanocomposite magnets prepared by spark plasma sintering

Saravanan, P.; Gopalan, R.; Sivaprahasam, D.; Chandrasekaran, V.

doi:10.1016/j.intermet.2009.01.005

Cited by 19 publications

(8 citation statements)

References 29 publications

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“…The sintering of as-milled powders leads to an increase in crystallite size due to the crystallization process caused by the heat treatment [ 45 ]. The crystallite size is dependent on the sintering temperature, e.g., being raised from about 18 (973 K) to about 32 nm (1123 K) [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

“…Considerable lattice straining is one of the critical effects for various ball-milled intermetallics [5,16,17,[32][33][34][35][36][37][38][39][40][41] induced by the substantial lattice disorder generated during HEBM by different deformation mechanisms. The sintering of as-milled powders leads to an increase in crystallite size due to the crystallization process caused by the heat treatment [45]. The crystallite size is dependent on the sintering temperature, e.g., being raised from about 18 (973 K) to about 32 nm (1123 K) [45].…”

Section: Xrdmentioning

confidence: 99%

“…So far, SmCo 5 -based nanocomposites have been synthesized in an argon atmosphere or by the use of the wet SA-HEBM procedure, usually applied for up to 10 h, and also by magnetic field-assisted HEBM [ 13 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ]. The comparison of properties achieved for magnetic field-milled SmCo 5 /α-Fe nanocomposite powders with 10 wt.% of α-Fe made by Saravanam et al [ 13 , 46 ] with and without surfactants emphasizes the influential role of wet milling [ 46 ].…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic properties of as-milled nanocomposites may be enhanced by further processing of synthesized powders. So far, two methods have been applied to SmCo 5 /α-Fe, namely, spark plasma sintering (SPS) [ 45 , 51 , 53 ] and plasma pressure consolidation (PPC) [ 50 ]. The combination of SPS/PPC parameters with precedents of the HEBM parameters has to be carefully planned in order to achieve optimized magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

“…After applying the first method mentioned, the increase in coercivity is noted as in the case of, e.g., SmCo 5 /α-Fe (20 wt.% α-Fe) from H C = 3.5 Oe (as-milled grains) to H c = 8.2 kOe, reasonably combined with the maximum energy product of ( BH ) max = 278.7 kJ/m 3 (sintered powders) [ 45 ]. In comparison, Pop et al [ 51 ] achieved the highest value of the maximum energy product (BH) max of 84 kJ/m 3 for a SmCo 5 /α-Fe (20 wt.% α-Fe) sample milled for 8 h and annealed at 550 °C for 1.5 h. The enhancement of magnetic parameters might be controlled by the amount of SmCo 5 powder in composites and simultaneously by SPS parameters.…”

Section: Introductionmentioning

confidence: 99%

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Correlation between Microstructure and Magnetism in Ball-Milled SmCo5/α-Fe (5%wt. α-Fe) Nanocomposite Magnets

et al. 2021

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Magnetic nanocomposites SmCo5/α-Fe were synthesized mechanically by high-energy ball milling (HEBM) from SmCo5 and 5%wt. of α-Fe powders. The X-ray diffraction analysis reveals the hexagonal 1:5 phase as the main one accompanied by the cubic α-Fe phase and 2:17 rhombohedral as the secondary phase. The content of each detected phase is modified throughout the synthesis duration. A significant decrease in crystallite size with a simultaneous increase in lattice straining is observed. A simultaneous gradual reduction in particle size is noted from the microstructural analysis. Magnetic properties reveal non-linear modification of magnetic parameters associated with the strength of the exchange coupling induced by various duration times of mechanical synthesis. The highest value of the maximum energy product (BH)max at room temperature is estimated for samples milled for 1 and 6 h. The intermediate mixed-valence state of Sm ions is confirmed by electronic structure analysis. An increase in the Co magnetic moment versus the milling time is evidenced based on the performed fitting of the Co3s core level lines.

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Section: Resultsmentioning

confidence: 99%