Magneti Ljubljana d.d. produces various types of polymer bonded magnets based on several types of magnetic materials (NdFeB, SmCo, SrFe…) and binders (PA12, PPS, Epoxy…). Polymer bonded magnets are best suited for magnets of very complex shapes, of a wide range of dimensions and magnetic properties. Besides the standard types of polymer bonded magnets represented in this catalogue, other feasible customer requirements can also be met.
| Characteristic | [Unit] | Plastomag |
|---|---|---|
| Density | [g/cm3] | 4,9 – 6,3 |
| Curie temperature | [°C] | 310 |
| Temperature Coefficient – TK Br | [%/K] | -0,1 |
| Temperature Coefficient – TK iHc | [%/K] | -0,7 |
| Required magnetising field strength | [kA/m] | 2800 |
| Name by standard | MQ powder | Binder | Br [mT] | Br [kG] | bHc [kA/m] | bHc [kOe] | iHc [kA/m] | iHc [kOe] | BHmax [kJ/m3] | BHmax [MGOe]] | ρ [g/cm3] | Top [ºC] | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| plastomag NPPS B | REFeB 41/64 p | MQP-13-9 | PPS | 480 | 4,80 | 330 | 4,12 | 720 | 9,00 | 42 | 5,38 | 4,9-5,2 | 150 | |
| plastomag NPPS G | REFeB 46/64 p | MQP-B | PPS | 520 | 5,20 | 350 | 4,37 | 720 | 9,00 | 48 | 6,00 | 4,9-5,2 | 150 | |
| plastomag NPPS HF | REFeB 51/75 p | MQP-B+ | PPS | 540 | 5,40 | 370 | 4,62 | 780 | 9,75 | 50 | 6,25 | 4,9-5,2 | 150 | |
| plastomag NPPS HC | REFeB 40/103 p | MQP-A | PPS | 480 | 4,80 | 360 | 4,50 | 1100 | 13,75 | 42 | 5,25 | 4,9-5,2 | 160 | |
| plastomag NPPS HR | REFeB 47/54 p | MQP-15-7 | PPS | 550 | 5,50 | 320 | 4,00 | 580 | 7,25 | 48 | 6,25 | 4,9-5,2 | 120 | |
| plastomag NPPS HT | REFeB 45/84 p | MQP-14-12 | PPS | 500 | 5,00 | 380 | 4,75 | 950 | 11,90 | 45 | 5,62 | 4,9-5,2 | 160 | |
| plastomag NPA B | REFeB 40/66 p | MQP-13-9 | PA 12 | 480 | 4,80 | 330 | 4,12 | 720 | 9,00 | 42 | 5,38 | 4,9-5,3 | 120 | |
| plastomag NPA G | REFeB 45/46 p | MQP-B | PA 12 | 520 | 5,20 | 350 | 4,37 | 720 | 9,00 | 48 | 6,00 | 4,9-5,3 | 120 | |
| plastomag NPA HF | REFeB 48/72 p | MQP-B+ | PA 12 | 570 | 5,70 | 390 | 4,87 | 750 | 9,38 | 57 | 7,13 | 4,9-5,3 | 120 | |
| plastomag NPA HC | REFeB 40/104 p | MQP-A | PA 12 | 480 | 4,80 | 360 | 4,50 | 1100 | 13,75 | 42 | 5,25 | 4,9-5,3 | 130 | |
| plastomag NPA HR | REFeB 46/54 p | MQP-15-7 | PA 12 | 550 | 5,50 | 320 | 4,00 | 580 | 7,25 | 48 | 6,25 | 4,9-5,3 | 120 | |
| plastomag NPA HT | REFeB 43/88 p | MQP-14-12 | PA 12 | 520 | 5,00 | 380 | 4,75 | 950 | 11,90 | 45 | 5,62 | 4,9-5,3 | 130 |
New filament for Fused Filament Fabrication (FFF) of bonded magnets based on MQ powder enables robust additive manufacturing of bonded magnets using conventional desktop 3D printers with magnetic properties comparable to the injection molded bonded magnets.
| Technology | Technology | MQ powder | Binder | Br | bHc | iHc | BHmax | ρ | Top |
| [mT] | [kA/m] | [kA/m] | [kJ/m3] | [g/cm3] | [°C] | ||||
| 3DplastoMAG | FDM/FFF | MQP-14-12 | TPU/PA12 | 507 | 358 | 910 | 43,50 | 4,90 | 80 |
Fig. 1: Filament for 3d printing of bonded magnets
Fig. 2: Examples of 3D printed bonded magnets
Sintered AlNiCo magnets also excel in high maximum operating temperatures and good corrosion resistance. Sintering is better than casting for more complex forms and usually smaller dimensions.
Sintered SmCo5 magnets are produced in a similar way as Sm2Co17 magnets, yet they have lower magnetization and also slightly lower maximum operating temperature. SmCo5 magnets are best for applications where only low magnetization fields can be applied andwhich still require quite high temperature stability.
SmCo magnets (including Sm2Co17) have much higher coercivity than AlNiCo magnets. This means that they are more resistant to demagnetizing fields. On the other hand they have still significantly higher maximum operating temperatures than NdFeB magnets.
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