NEOREC(NEODYMIUM-IRON-BORON) MAGNETS
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1 NEOREC(NEODYMIUM-IRON-BORON) MAGNETS Introduction... 1 Features/Applications... 2 / Characteristics Distribution... 3 Irreversible Demagnetization Characteristics... Magnet Structures/Magnetic Characteristics/ Rust Prevention Treatments... 6 Demagnetization Curves/Magnetic Characteristics NEORECH... 8 NEOREC2A... 9 NEORECB... 1 NEORECF NEOREC47B NEOREC4F NEOREC47H NEOREC44H... NEOREC41H NEOREC42SH NEOREC38SH NEOREC4UH NEOREC38UH... 2 NEOREC3UH NEOREC3UX NEOREC3UX NEOREC3EV NEOREC42B... 2 NEOREC4F NEOREC4H NEOREC37H NEOREC34SH NEOREC31UH... 3 NEOREC27UX Conformity to RoHS Directive: This means that, in conformity with EU Directive 22/9/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.
2 (1/31) Neodymium-Iron-Boron Magnets NEOREC Series INTRODUCTION In recent years, small, high-performance rare-earth magnets have been in increasing demand for use in electronics equipment. In 1977, TDK commercialized a 2-17 type REC magnet, solving the problem of high cost, the main drawback with conventional samariumcobalt magnets. It not only achieved better cost-performance, its superior performance was appraised as being the highest in the world. The NEOREC magnet is a new product, surpassing the REC magnet. The main raw materials are neodymium, a rare-earth element, iron and boron. Its magnetic characteristics at the mass production level reach 49MGOe in maximum energy product(bh), achieving to 8% high performance with 1% reduction in specific gravity compared with samarium-cobalt magnets. Ideal for meeting miniaturization and weight reduction needs for VCMs and other equipment. TDK offers a selection of custom magnets in any shapes and sizes to meet customers requirements. TDK also provides a range of technical services, including design of NEOREC magnet-applied products. For further information, please contact TDK or your nearest representatives. Development of this product was made under license granted for the use of proprietary techniques developed by Hitachi Metals, Ltd. Conformity to RoHS Directive: This means that, in conformity with EU Directive 22/9/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications. 1-2 / / e331.fm
3 (2/31) FEATURES/APPLICATIONS FEATURES Magnetic characteristics at the mass production level reach 49MGOe in maximum energy product(bh) max, achieving to 8% higher performance than rare-earth cobalt magnet. The specific gravity is 7.4g/cm 3 more than 1% lower than that of rare-earth cobalt magnet. Ideal for meeting miniaturization and weight reduction needs. Higher mechanical strength such as bending and tensile strength than rare-earth cobalt magnets, making handling easier than before. Since the main raw materials are neodymium and iron, both abundant resources, stable supply is assured. APPLICATIONS Actuators for magnetic and optical disks, core-less motors, servomotors, stepping motors, MRI s printers, sensors, magnetrons, klystrons, magnetic bearings, magnetic couplings, etc. DIFFRENCES BETWEEN NdFe-MAGNET AND SmCo-MAGNET Item NdFe-magnet SmCo-magnet Composition Nd, Fe, B, and other additives Sm, Co, Fe, Cu, and other additives Manufacturing method Sintering Sintering Magnetic characteristics Maximum energy product 28 to 49MGOe 16 to 32MGOe Residual flux density 1.3 to 13.kG 8.2 to 11.6kG Intrinsic coercive force 11. to 2.kOe 6.2 to 2.kOe Recoil permeability Reversible temperature coefficient of.11 to.13%/ C.3 to.4%/ C Temperature coefficient of. to.6%/ C. to.3%/ C Physical characteristics Curie temperature 32 C 8 C Density 7.3 to 7.g/cm to 8.4g/cm 3 Thermal expansion coefficient C// ( to 1 C) / C / C C ( to 1 C) / C / C Mechanical characteristics Deflection strength 2kg/mm 2 kg/mm 2 Compressive strength 11kg/mm 2 82kg/mm 2 Tensile strength 7.kg/mm 2 3.6kg/mm 2 Vickers hardness to 6 to Electric resistance Ωcm Ωcm Required magnetizing field 2kOe min. koe min.(smco system) 2kOe min.(sm2co27 system) Resistance to cracking Solid, hard to break ittle easily Resistance to rust Relatively easy to rust Relatively resistant to rust C// is the value measured in the easy magnetization direction. C is the value measured in the vertical direction to the easy magnetization direction. 1-2 / / e331.fm
4 (3/31) / CHARACTERISTICS DISTRIBUTION OF NEOREC MAGNETS 2A F B 47B H 47H NEOREC(Nd-Fe-B) 4F 44H 42B 4F 41H 4H 37H 42SH 38SH 4UH 38UH 34SH 3UH 3UX 3 32A 32AH 31UH 3UX 27UX 3EV Residual flux density A REC(Sm-Co) 18 CM CM 11UH 11SH Transverse magnetic field press Axial magnetic field press CM 8BLH CM(Nd-Fe-B Bonded magnets) CM 8BL Intrinsic coercive force / / e331.fm
5 (4/31) TRANSVERSE MAGNETIC FIELD PRESS Direction of pressed powder Magnetic field coil A F B 47B 4F H 47H 44H Pole piece Upper punch Direction of magnetic field Residual flux density H 42SH 38SH 4UH 38UH 3UH 3UX 3UX Magnetic powder Under punch Die Block magnet(type) for pick up For FA s motor N S For automotive actuator For pager Intrinsic coercive force AXIAL MAGNETIC FIELD PRESS Direction of pressed powder Magnetic field coil Upper punch Magnetic powder 42B Residual flux density F 4H 37H 34SH Under punch VCM 31UH For ABS s sensor UX For CD s and MD s clamper For camcorder s motor For optical pickup 1 2 Intrinsic coercive force 2 For FA s motor For automotive actuator 1-2 / / e331.fm
6 (/31) IRREVERSIBLE DEMAGNETIZATION CHARACTERISTICS The irreversible demagnetization characteristics of NEOREC magnets are dependent on their coercive forces and are not due to their residual flux densities. There is no difference between the irreversible demagnetization characteristics of transversely and longitudinally magnetized products. TEMPERATURE DEPENDENCE OF IRRERSIBLE DEMAGNETIZATION FACTOR Temperature( C) Irrersible demagnetization factor(%) Pc=. NEOREC4F NEOREC41H NEOREC38SH NEOREC3UH NEOREC3UX Temperature( C) Irrersible demagnetization factor(%) Pc=1. NEOREC4F NEOREC41H NEOREC38SH NEOREC3UH NEOREC3UX Temperature( C) Irrersible demagnetization factor(%) Pc=2. NEOREC4F NEOREC41H NEOREC38SH NEOREC3UX NEOREC3UH TEMPERATURE OF % MAGNETIC FLUX LOSS vs. COERCIVE FORCE 32 3 Temperature of % magnetic flux loss ( C) Pc=2. Pc=1. Pc=. NEOREC4F NEOREC41H NEOREC38SH NEOREC3UH NEOREC3UX Pc=2. Pc=1. Pc= Intrinsic coercive force 1-2 / / e331.fm
7 (6/31) MAGNET STRUCTURES//RUST PREVENTION TREATMENTS CROSS SECTION OF A MAGNET (MODEL ILLUSTRATION) Orientation (Alignment axis of easy magnetization) Primary phase (Nd2Fe14B) Grain boundary phase (Nd-rich) B-rich phase (Nd1.1Fe4B4) Cavities Oxide phase (Nd2O3) Carbide phase (Nd2C3) PHASE PROPORTIONS AND NEOREC Series (%) 38 s 41 s 4 s s Primary phase Grain boundary phase B-rich phase Oxide phase Carbide phase Cavities Orientation (%) Primary phase CORROSION RESISTANCE OF MAGNET MATERIALS (MODEL ILLUSTRATION) Before corrosion Corrosion (early stage) Corrosion (late stage) Primary phase crystal grains(nd2fe14b) Grain boundary phase(nd-rich) 1) Corrosion on the surface of the primary phase Fe2O3 H2O 2) Corrosion in the grain boundary phase (Nd-rich) (Nd2O3, Nd(OH)3) Drop-off of primary phase crystal grains Corrosion on the surface of the primary phase Corrosion in the grain boundary phase 1-2 / / e331.fm
8 (7/31) RUST PREVENTION TREATMENTS FOR NEOREC Surface treatment technique Film structure Please consult us for the different types of surface treatments. CORRELATION IN HUMIDITY RESISTANCE TESTS ( 2hr: Pre-shipment inspection) Ni plating Electrolytic plating Electrolytic plating with good throwing power Element Ni Ni Ni/Sn Spontaneous potential (mv: standard electrode) 2 to 3 22 to 17 1 to Internal stress (Mpa) to 1 to to Vickers hardness (Hv) 4 to 6 2 to 3 2 to 3 Organic brightener Used Not used Not used Improvements to corrosion resistance and adhesion Film thickness Range (µm) 1 to 2 1 to 2 1 to 2/1 to 3 Uniformity Acceptable Good Good Room temperature Good Excellent Excellent Adhesion 2 C Acceptable Good Good Adhesiveness Acceptable Good Excellent Temperature resistance test (6 C, 9%RH) >2 (hr) >2 (hr) >2 (hr) Reliability Humidity resistance test (8 C, 8%RH) > (hr) > (hr) > (hr) Salt spray test (3 C, % NaCl) <24 (hr) <24 (hr) >24 (hr) SO2 gas test (4 C, 7%RH) <96 (hr) <96 (hr) >96 (hr) Examples of applications HDD Optical pickups, sensors Motors for hard disk drives, and motors (electrical Actuators, sensors and audio visual equipment and household appliances, motors (factory automation office automation factory automation and and automobiles) equipment. (electrical automobiles) household appliances) Maximum operating temperature ( C) Test items Conditions Times Pressure cooker test 12 C 2atm, 1%RH 2 (hours) Humidity resistance test 8 C, 8%RH 2 (hours) C, 9 %RH (hours) Cycle test MIL22F-16E (cycles) C Rust 78%RH (blisters) 4. (years) Operating environment Bangkok eaking 18 (years) (estimated) 16.2 C Rust 67%RH (blisters) 22. (years) Osaka eaking 9 (years) / / e331.fm
9 (8/31) S/ NEORECH C 6 C 1 C 14 C Residual flux density 142±2 14.2±.2 19±6 13.7±.7 Intrinsic coercive force Maximum energy product [kj/m 3 ] 39±16 (MGOe) 49.± / / e331.fm
10 (9/31) NEOREC2A C C 1 C Residual flux density 144±2 14.4±.2 13±72 13.±.9 Intrinsic coercive force Maximum energy product [kj/m 3 ] 398±16 (MGOe).± / / e331.fm
11 (1/31) NEORECB C 6 C 1 C 14 C Residual flux density 142±2 14.2±.2 174±48 13.±.6 Intrinsic coercive force Maximum energy product [kj/m 3 ] 39±16 (MGOe) 49.± / / e331.fm
12 (11/31) NEORECF C 6 C 1 C 14 C Residual flux density 143±3 14.3±.3 876±6 11.±.7 Intrinsic coercive force >876 >11. Maximum energy product [kj/m 3 ] 39±16 (MGOe) 49±2 1-2 / / e331.fm
13 (12/31) NEOREC47B C 6 C 1 C 14 C Residual flux density 139±3 13.9±.3 13±6 13.±.7 Intrinsic coercive force >1114 >14. Maximum energy product [kj/m 3 ] 366±16 (MGOe) 46±2 1-2 / / e331.fm
14 (13/31) NEOREC4F C 6 C 1 C 14 C Residual flux density 136±3 13.6±.3 111±6 12.7±.7 Intrinsic coercive force >1114 >14. Maximum energy product [kj/m 3 ] 3±16 (MGOe) 44±2 1-2 / / e331.fm
15 (14/31) NEOREC47H C 6 C 1 C 14 C Residual flux density 139±2 13.9±.2 167± ±.6 Intrinsic coercive force Maximum energy product [kj/m 3 ] 374±16 (MGOe) 47.± / / e331.fm
16 (/31) NEOREC44H C 6 C 1 C 14 C Residual flux density 136±3 13.6±.3 13±6 12.6±.7 Intrinsic coercive force >133 >17. Maximum energy product [kj/m 3 ] 3±16 (MGOe) 44±2 1-2 / / e331.fm
17 (16/31) NEOREC41H C 6 C 1 C. 14 C Residual flux density 13±3 13.±.3 971±6 12.2±.7 Intrinsic coercive force >133 >17. Maximum energy product [kj/m 3 ] 326±16 (MGOe) 41±2 1-2 / / e331.fm
18 (17/31) NEOREC42SH B-H Curve J-H Curve 2 C 6 C 1 C 14 C. 18 C Residual flux density 13±3 13.±.3 979±6 12.3±.7 Intrinsic coercive force >1671 >21. Maximum energy product [kj/m 3 ] 326±16 (MGOe) 41±2 1-2 / / e331.fm
19 (18/31) NEOREC38SH C 6 C 1 C. 14 C 18 C Residual flux density 126±3 12.6±.3 939±6 11.8±.7 Intrinsic coercive force >1671 >21. Maximum energy product [kj/m 3 ] 32±16 (MGOe) 38±2 1-2 / / e331.fm
20 (19/31) NEOREC4UH C C 6 C 1 C 14 C. 18 C Residual flux density 129±3 12.9±.3 99±6 12.±.7 Intrinsic coercive force Maximum energy product [kj/m 3 ] 31±16 (MGOe) 39±2 1-2 / / e331.fm
21 (2/31) NEOREC38UH C 18 C 1 2 C 1.7 B-H Curve J-H Curve 2 C 6 C 1 C Residual flux density 126±3 12.6±.3 963±6 12.1±.7 Intrinsic coercive force Maximum energy product [kj/m 3 ] 294±16 (MGOe) 37±2 1-2 / / e331.fm
22 (21/31) NEOREC3UH C 6 C. 1 C 14 C C 2 C Residual flux density 12±3 12.±.3 931± ±.6 Intrinsic coercive force >199 >2. Maximum energy product [kj/m 3 ] 279±24 (MGOe) 3±3 1-2 / / e331.fm
23 (22/31) NEOREC3UX C 14 C C 6 C. 18 C 2 C Residual flux density 12±3 12.±.3 923±6 11.6±.7 Intrinsic coercive force Maximum energy product [kj/m 3 ] 271±16 (MGOe) 34±2 1-2 / / e331.fm
24 (23/31) NEOREC3UX C. 6 C 1 C 1 14 C 1 18 C 2 C Residual flux density 1±3 11.±.3 876±6 11.±.7 Intrinsic coercive force >2388 >3. Maximum energy product [kj/m 3 ] 2±16 (MGOe) 32±2 1-2 / / e331.fm
25 (24/31) NEOREC3EV C 1 16 C C. 1 C 18 C 2 C Residual flux density 114±3 11.4±.3 867±6 1.9±.7 Intrinsic coercive force Maximum energy product [kj/m 3 ] 231±16 (MGOe) 29±2 at 2 C 1-2 / / e331.fm
26 (2/31) NEOREC42B C 6 C 1 C 14 C Residual flux density 133±3 13.3±.3 987±6 12.4±.7 Intrinsic coercive force >1114 >14. Maximum energy product [kj/m 3 ] 334±16 (MGOe) 42±2 1-2 / / e331.fm
27 (26/31) NEOREC4F C 6 C 1 C. 14 C Residual flux density 13±3 13.±.3 963±6 12.1±.7 Intrinsic coercive force >1114 >14. Maximum energy product [kj/m 3 ] 318±16 (MGOe) 4±2 1-2 / / e331.fm
28 (27/31) NEOREC4H C 6 C 1 C. 14 C Residual flux density 13±3 13.±.3 971±6 12.2±.7 Intrinsic coercive force >133 >17. Maximum energy product [kj/m 3 ] 318±16 (MGOe) 4±2 1-2 / / e331.fm
29 (28/31) NEOREC37H C 6 C 1 C 14 C Residual flux density 124±3 12.4±.3 923±6 11.6±.7 Intrinsic coercive force >133 >17. Maximum energy product [kj/m 3 ] 294±16 (MGOe) 37±2 1-2 / / e331.fm
30 (29/31) NEOREC34SH C 6 C 1 C 14 C 1 18 C Residual flux density 118±3 11.8±.3 876±6 11.±.7 Intrinsic coercive force >1671 >21. Maximum energy product [kj/m 3 ] 271±16 (MGOe) 34±2 1-2 / / e331.fm
31 (3/31) NEOREC31UH C 6 C 1 C C 18 C 2 C Residual flux density 112±3 11.2±.3 867±48 1.9±.6 Intrinsic coercive force >199 >2. Maximum energy product [kj/m 3 ] 239±24 (MGOe) 3±3 1-2 / / e331.fm
32 (31/31) NEOREC27UX C 6 C C 14 C 18 C 2 C Residual flux density 18±3 1.8±.3 819±6 1.4±.7 Intrinsic coercive force >2388 >3. Maximum energy product [kj/m 3 ] 223±16 (MGOe) 28±2 1-2 / / e331.fm
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