Table 1. Magnetic Properties of Magnets Processed by Different Techniquesa.
| Reference | Composition | Sintering technique | Ms [A m2 kg –1] | Mr [A (m2 kg–1)] (μ0Mr) [T] | μ0Hc [kA/m] | (BH)max [kJ/m3] |
|---|---|---|---|---|---|---|
| Hexaferrite magnet | ||||||
| (18) | SrFe12O19 | Conventional (Thermal sintering) | (0.38) | 270.6 | 33.5 | |
| (37) | SrFe12O19 SiO2 | Conventional (Thermal sintering) | 54 | 135.2 | ||
| (38) | SrFe12O19·0.2%PVA·0, 6%SiO2 | Ceramic processing route with two-step sintering | 58 | 46 | 163.1 | |
| (39) | SrFe12O19 | Microwave-assisted calcination route | 54.8 | 29.52 | 421.8 | |
| (40) | SrFe12O19 | Microwave sintering | 50.4 | 437.7 | ||
| (41) | M-SrFe12O19 | Microwave sintering | 64 | 95.5 | ||
| (42) | SrM ferrite fine particles (1.0%La2O3, 0.1%Co3O4) | Spark plasma sintering | (0.32) | 326.3 | 18.2 | |
| (43) | SrFe12O19 | Spark plasma sintering | 73.6 | 65.8 | 167.1 | 21.9 |
| (44) | SrFe12O19 | Hydrothermal: Sol–gel precursor coating technique | 64.5 | 389.9 | ||
| (45) | SrFe12O19 | Hydrothermal | 72.2 | 44.76 | 175.1 | 9.5 |
| Mn–Al–C magnets | ||||||
| (32) | Mn53Al45C2 | Casting + annealing + hot extrusion | (0.61) | 214.9 | 49.0 | |
| (46) | Mn55Al45C1 | Mechanical milling + powder compaction + annealing | 119 | 41 | 119.4 | 6.2 |
| (47) | Mn56Al44 | Mechanical milling + spark plasma sintering + rapid thermal annealing | 28 | 193.4 | ||
| (48) | Mn53.5Al44.5C2 | Arc-melting + annealing + high energy ball milling + hHot compaction | (0.50) | 28 | 262.6 | 4.8 |
| (47) | Mn53.5Al44.5C2 | Arc melting + annealing + high energy ball milling + microwave sintering + compaction | 94 | 39 | 87.5 | 4.0 |
| (49) | (Mn54Al46)97.56C2.44 | Gas atomization powdering + annealing + compaction | 90 | 39 | 270.6 | |
| (34) | (Mn57Al43)C1.1 | Gas atomization powdering + annealing + hot compaction | 77 | 42.3 | 287.3 | 11.0 |
| (50) | (Mn54Al46)97.56C2.44 | Melting + melt spinning + annealing + crushing + compaction | 122 | 103.5 | ||
| (51) | Mn54Al44C2 | Melting + melt spinning + mechanical milling + spark plasma sintering | (0.55) | (0.31) | 143.3 | |
a
Ms, saturation magnetization; Mr, remanence; Hc, coercivity; (BH)max, maximum energy product.