Neodymium magnets can be divided into three main groups:
1.Regular Neodymium Magnets
2.High corrosion resistant Neodymium Magnets
3.Bonded Neodymium (Isotropic): Manufactured by the injection of plastic material and Neodymium into a mold. This production method yields a very precise magnet which does not require further grinding and does not suffer substantial current loss.
Under the Environment of high temperature, high pressure and high humidity, the weight loss level of uncoated magnets can qualitatively reflect its serving life clearly. Referring to the standard IEC68-2-66 and after 20 days, Hast testing, weight loss of less than 2mg/cm² is available for Precision Magtech, which is the top level worldwide.
Weight loss of Precision Magtech in a Hast-Test ( 130℃, 95% relative humidity 2.7bar in vapor)?
NdFeB magnets could be glued in any sizes depends on customers requests, there is a max Isolation Resistance requests, glue gap thickness etc, and how to test the isolation resistance as below.
Advantages and Disadvantages of NdFeB Permanent Magnets
1) Is the strongest magnetic of permanent magnets, has the high energy (BH value) and good coercive force.
2) Manufacturing by the the vacuum sintering process, process maturity;small dimensions,have the good performances and prices; energy (BH value) of NdFeB magnets is more than ten times higher than Ferrites, it is the strongest magnetic materials in the world today, have “magnetic king”reputation.
3) Using the cutting process after sintering,according to the requirements,by the rapid processing, they can be cutted into square,disc.,ring,segment(like tile shape),and so on;Dimension tolerance is commonly +/-0.05mm,if special request,it can be controlled within 0.05mm range by increasing grinding; If requesting the higher process,using the fast quenching scales manufacturing Nd-Fe-B binding NdFeB1988,the precision of dimensions can be reached 0.01mm,but because the organic binder content cause the low energy product,and the much higher cost of forming dies.
4) NdFeB permanent magnets are easy to be rusted/oxided, so their surface should be done eletroplating treatment, such as galvanized(Zn coating), Nickel+copper+nickel, and so on, generally, it requests more than 48hours in Salt-spray test; also can be passivated treament to slow down its oxidative speed; if using the vacuum plating aluminum + electrophoresis epoxy resin, it can go through more than 96hours in Salt-spray condition.
Basic Performance Comparison Table of Permanent Magnets
Magnets | BHmax(MGOe) | Max.Working Temp.(0C) | Corrosion Resistance | Magnetic Performance | Material Price | Coercive Force | Processing Charateristics | Composite Index |
---|---|---|---|---|---|---|---|---|
Sintered NdFeB | 26-52 | ≤200 | C | A+ | B- | A+ | B+ | 70 |
SmCo 2:17 | 22-30 | ≤300 | A | A | C- | A | C | 64 |
SmCo 1: 5 | 16-25 | ≤250 | A | A- | C | A- | C | 62 |
Bonded NdFeB | 5/12 | <150 | B- | B | C | A+ | - | 68 |
AlNiCo | <10 | <550 | A+ | B | B | C- | C | 54 |
Sintered Ferrite | 3-4.5 | < 350 | A | C | A | B- | B | 64 |
Bonded Ferrite | 2-3 | < 150 | A | C | B | B- | - | 66 |
Rubber | 0.7/1.6 | <85 | B | C | B+ | C | A | 56 |
Grade | Br | HcB | Hcj | (BH )max | Max Working Temperature | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
KGs | T | KOe | KA/m | KOe | KA/m | MGOe | KJ/m 3 | L/D=0.7 | |||||
Max | Min | Max | Min | Min | Min | Min | Min | Max | Min | Max | Min | ℃ | |
N33 | 11.8 | 11.3 | 1.18 | 1.13 | ≥10.5 | ≥836 | ≥12 | ≥955 | 34 | 31 | 271 | 247 | ≤80 |
N35 | 12.3 | 11.8 | 1.23 | 1.18 | ≥10.9 | ≥866 | ≥12 | ≥955 | 36 | 33 | 287 | 263 | ≤80 |
N38 | 12.6 | 12.3 | 1.26 | 1.23 | ≥11.3 | ≥899 | ≥12 | ≥955 | 39 | 36 | 311 | 287 | ≤80 |
N40 | 12.9 | 12.6 | 1.29 | 1.26 | ≥11.4 | ≥90 | ≥12 | ≥955 | 41 | 38 | 327 | 302 | ≤80 |
N42 | 13.3 | 12.9 | 1.33 | 1.29 | ≥11.5 | ≥915 | ≥12 | ≥955 | 43 | 40 | 342 | 318 | ≤80 |
N45 | 13.7 | 13.3 | 1.37 | 1.33 | ≥11.0 | ≥876 | ≥12 | ≥955 | 46 | 43 | 366 | 342 | ≤80 |
N48 | 14.1 | 13.7 | 1.41 | 1.37 | ≥10.5 | ≥836 | ≥11 | ≥876 | 49 | 45 | 390 | 358 | ≤80 |
N50 | 14.5 | 14.0 | 1.45 | 1.40 | ≥10.5 | ≥836 | ≥11 | ≥876 | 51 | 47 | 406 | 374 | ≤60 |
N52 | 14.8 | 14.3 | 1.48 | 1.43 | ≥10.5 | ≥836 | ≥11 | ≥876 | 53 | 49 | 422 | 390 | ≤60 |
30M | 11.3 | 10.8 | 1.13 | 1.08 | ≥10 | ≥796 | ≥14 | ≥1114 | 31 | 28 | 247 | 223 | ≤100 |
33M | 11.8 | 11.3 | 1.18 | 1.13 | ≥10.5 | ≥836 | ≥14 | ≥1114 | 34 | 31 | 271 | 247 | ≤100 |
35M | 12.3 | 11.8 | 1.23 | 1.18 | ≥10.9 | ≥868 | ≥14 | ≥1114 | 36 | 34 | 287 | 271 | ≤100 |
38M | 12.6 | 12.3 | 1.26 | 1.23 | ≥11.3 | ≥899 | ≥14 | ≥1114 | 39 | 36 | 311 | 287 | ≤100 |
40M | 12.9 | 12.6 | 1.29 | 1.26 | ≥11.6 | ≥923 | ≥14 | ≥1114 | 41 | 38 | 327 | 302 | ≤100 |
42M | 13.3 | 12.9 | 1.33 | 1.29 | ≥12 | ≥955 | ≥14 | ≥1114 | 43 | 40 | 342 | 318 | ≤100 |
45M | 13.7 | 13.3 | 1.37 | 1.33 | ≥12.5 | ≥995 | ≥14 | ≥1114 | 46 | 43 | 366 | 342 | ≤100 |
48M | 14.1 | 13.7 | 1.41 | 1.37 | ≥12.9 | ≥1027 | ≥14 | ≥1114 | 49 | 45 | 390 | 358 | ≤100 |
50M | 14.5 | 14.0 | 1.45 | 1.40 | ≥13 | ≥1033 | ≥14 | ≥1114 | 51 | 47 | 406 | 374 | ≤100 |
30H | 11.3 | 10.8 | 1.13 | 1.08 | ≥10 | ≥796 | ≥17 | ≥1353 | 31 | 28 | 247 | 223 | ≤120 |
33H | 11.8 | 11.3 | 1.18 | 1.13 | ≥10.5 | ≥836 | ≥17 | ≥1353 | 34 | 31 | 271 | 247 | ≤120 |
35H | 12.3 | 11.8 | 1.23 | 1.18 | ≥10.9 | ≥868 | ≥17 | ≥1353 | 36 | 33 | 287 | 263 | ≤120 |
38H | 12.6 | 12.3 | 1.26 | 1.23 | ≥11.3 | ≥899 | ≥17 | ≥1353 | 39 | 36 | 311 | 287 | ≤120 |
40H | 12.9 | 12.6 | 1.29 | 1.26 | ≥11.6 | ≥923 | ≥17 | ≥1353 | 41 | 38 | 327 | 302 | ≤120 |
42H | 13.3 | 12.9 | 1.33 | 1.29 | ≥12 | ≥955 | ≥17 | ≥1353 | 43 | 40 | 342 | 318 | ≤120 |
45H | 13.7 | 13.3 | 1.37 | 1.33 | ≥12.3 | ≥979 | ≥17 | ≥1353 | 46 | 43 | 366 | 342 | ≤120 |
Grade | Br | HcB | Hcj | (BH )max | Max Working Temperature | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
KGs | T | KOe | KA/m | KOe | KA/m | MGOe | KJ/m 3 | L/D=0.7 | |||||
Max | Min | Max | Min | Min | Min | Min | Min | Max | Min | Max | Min | ℃ | |
48H | 14.1 | 13.7 | 1.41 | 1.37 | ≥12.5 | ≥995 | ≥17 | ≥1353 | 49 | 46 | 390 | 366 | ≤120 |
30SH | 11.4 | 10.8 | 1.14 | 1.08 | ≥10.1 | ≥804 | ≥20 | ≥1592 | 31 | 28 | 247 | 223 | ≤150 |
33SH | 11.8 | 11.4 | 1.18 | 1.14 | ≥10.6 | ≥844 | ≥20 | ≥1592 | 34 | 31 | 271 | 247 | ≤150 |
35SH | 12.3 | 11.8 | 1.23 | 1.18 | ≥11.0 | ≥876 | ≥20 | ≥1592 | 36 | 33 | 287 | 263 | ≤150 |
38SH | 12.6 | 12.3 | 1.26 | 1.23 | ≥11.4 | ≥907 | ≥20 | ≥1592 | 39 | 36 | 311 | 287 | ≤150 |
40SH | 12.9 | 12.6 | 1.29 | 1.26 | ≥11.6 | ≥939 | ≥20 | ≥1592 | 41 | 38 | 326 | 302 | ≤150 |
42SH | 13.3 | 12.9 | 1.33 | 1.29 | ≥12.4 | ≥987 | ≥20 | ≥1592 | 43 | 40 | 342 | 318 | ≤150 |
45SH | 13.7 | 13.2 | 1.37 | 1.32 | ≥12.6 | ≥1003 | ≥20 | ≥1592 | 46 | 42 | 366 | 334 | ≤150 |
28UH | 10.8 | 10.4 | 1.08 | 1.04 | ≥9.6 | ≥764 | ≥25 | ≥1989 | 29 | 26 | 231 | 207 | ≤180 |
30UH | 11.4 | 10.8 | 1.14 | 1.08 | ≥10.1 | ≥804 | ≥25 | ≥1989 | 31 | 28 | 247 | 223 | ≤180 |
33UH | 11.8 | 11.4 | 1.18 | 1.14 | ≥10.7 | ≥852 | ≥25 | ≥1989 | 34 | 31 | 271 | 247 | ≤180 |
35UH | 12.3 | 11.8 | 1.23 | 1.18 | ≥10.8 | ≥860 | ≥25 | ≥1989 | 36 | 33 | 287 | 263 | ≤180 |
38UH | 12.6 | 12.3 | 1.26 | 1.23 | ≥11.3 | ≥899 | ≥25 | ≥1989 | 39 | 36 | 311 | 287 | ≤180 |
40UH | 12.9 | 12.5 | 1.29 | 1.25 | ≥11.3 | ≥899 | ≥25 | ≥1989 | 41 | 38 | 326 | 302 | ≤180 |
42UH | 13.3 | 12.8 | 1.33 | 1.28 | ≥11.6 | ≥923 | ≥25 | ≥1989 | 43 | 40 | 342 | 318 | ≤180 |
28EH | 10.8 | 10.4 | 1.08 | 1.04 | ≥9.8 | ≥780 | ≥30 | ≥2388 | 29 | 26 | 231 | 207 | ≤200 |
30EH | 11.4 | 10.8 | 1.14 | 1.08 | ≥10.1 | ≥804 | ≥30 | ≥2388 | 31 | 28 | 247 | 223 | ≤200 |
33EH | 11.8 | 11.4 | 1.18 | 1.14 | ≥10.3 | ≥820 | ≥30 | ≥2388 | 34 | 31 | 271 | 247 | ≤200 |
35EH | 12.3 | 11.7 | 1.23 | 1.17 | ≥10.5 | ≥836 | ≥30 | ≥2388 | 36 | 33 | 287 | 263 | ≤220 |
38EH | 12.6 | 12.2 | 1.26 | 1.22 | ≥11.3 | ≥899 | ≥30 | ≥2388 | 39 | 35 | 311 | 278 | ≤220 |
28AH | 10.9 | 10.4 | 1.09 | 1.04 | ≥9.8 | ≥780 | ≥35 | ≥2785 | 29 | 33 | 231 | 207 | ≤230 |
30AH | 11.3 | 10.8 | 1.13 | 1.08 | ≥10.1 | ≥804 | ≥35 | ≥2785 | 31 | 26 | 247 | 223 | ≤230 |
33AH | 11.8 | 11.3 | 1.18 | 1.13 | ≥10.3 | ≥820 | ≥33 | ≥2625 | 34 | 28 | 271 | 247 | ≤230 |
35AH | 12.3 | 11.7 | 1.23 | 1.17 | ≥10.5 | ≥860 | ≥33 | ≥2625 | 36 | 33 | 287 | 263 | ≤230 |
Demagnetization curve of grade N40SH Demagnetization curve of grade N42SH
Demagnetization curve of grade N39SH Demagnetization curve of grade N28EH
Demagnetization curve of grade N35UH Demagnetization curve of grade N42H
Special Propertv Data
Grade | Item | (Lost percent when heat up %/℃)(20℃~1 50℃) | (Lost weight standard)mg/cm2 | |
---|---|---|---|---|
Br | Hcj | |||
Normal Grade | -(0.1 1 ~0.1 2) | -(0.58~0.70) | ≤80 | |
"T"Grade1 | -(0.095~0.1 1 5) | -(0.46~0.59 | ≤15 | |
"L"Grade2 " | -(0.1 0~0.1 2) | -(0.55~0.65) | ≤5 | |
"TL"Grade3 | -(0.095~0.1 1 5) | -(0.46~0.59) | ≤5 |
Remark :
1) “T” grade seris product can be better temperature performance, and it could be used from "H" grade like 45HT、35SHT、38UHT;
2) “L” rade seris product can be better lost weight performance, and our lost weight test standard is 1 21℃ 2atm 95%Humidity,168hours;
3) “TL” rade seris product have both the "L" and "T" grade.
Physical Property
Parameter | Unit | Reference Value |
---|---|---|
Vickers hardness | Hv | ≥550 |
Density | g/cm3 | ≥7.40 |
RecalPenmeability μr | \ | 1.05 |
Curie point Tc | \℃ | 312~380 |
Specific resistance | μ Ω ·cm | 150 |
Bending strength | MPa | 250 |
Compressive strength | MPa | 1000~1100 |
Thermal expansion (⊥) | ℃-1 | -~3)×10-6K |
Thermal expansion ( // ) | ℃-1 | -~4)×10-6K |
Item | Inspecting method | Inspecting standard |
Magnetic performance | GB/T 13560-2000 | GB/T3217-92 |
Weightlessness rate | Test cases with constant temperature & constant pressure ,96hrs ,(130±2℃(0.27MPa) | Normal products :≤50mg/cm2 ; Low weight-loss products :≤10mg/cm2 |
Density | Drainage method for measuring | 7.4-7.6g/ cm3 |
ROHS requirements | Equivalent to use the green purchasing standards CS-K1100 (2 edition) in SANYO | |
Mechanical performance index | ||
Hardness: 570HV | Fracture toughness :2.5-5 Mpam2 | |
Resistivity:150μΩ·cm | Specific heat:0.502 Kj· (kg·℃ | |
Compressive strength:780 N/mm2 | Thermal conductivity :8.9551 w/m·K | |
Bending strength :290 Mpa | Thermal expantion coefficient(in vertical orientation direction):-4.8X10-6K |
On the basis of producing high quality raw blocks, Precision Magtech has been researching and developing updated surface protection technology vigorously. We can provide customers with high quality coatings and humidity resistance of coated magnets are quite good to assure magnets safe enough even in rigorous environments.
During the process of coating and plating, Precision Magtch attaches great importance to environment protection, all coatings meet the requirements of ROHS.
Neo magnets are known for their high temperature resistance, making them durable and functional in temperatures exceeding 200°C. This quality makes them ideal for heavy industry applications. Sintered Neodymium, however, is sensitive to oxidization and can develop corrosion, so magnets are usually coated with Nickel+Copper+Nickel,Nickel+Sn, Zn(galvanization), Epoxy and Passivation for their protection.
Type | Thickness | Colour | Temperature | PCT | SST | Characteristic |
---|---|---|---|---|---|---|
Zn | 5-10μm | Blue Silver | ≤160℃ | — | >48hr | protection for most products |
Ni+Sn | 10-30μm | Semibright Silver | ≤160℃ | >48hr | >96hr | excellent climate&salt spray resistance |
Ni | 10-30μm | Blue Silver | ≤200℃ | >48hr | >96hr | excellent climate&salt spray resistance , suitable for clean-room |
Al Spraying | 6-20μm | Dark Silver | ≤200℃ | — | >288hr | superior resistance to salt &humid atmosphere suitable for big size or anomalous magnets |
IVD Al | 10-30μm | Silver White | ≤400℃ | >48hr | >288hr | superior resistance to salt&humid atmosphere , thickness equality , excellent adhesive attraction |
Epoxy | 10-30μm | Black Gray | ≤120℃ | >48hr | >96hr | well climate&salt spray resistance |
Precision Magtech has advanced equipment and strong ability of machining. Good process performance is available for various shapes of complex, precise and big magnets including cubes, segments, disks and rings etc.
1. Cubes
Dimension (mm) | Tolerance (mm) | Parallelism (mm) | Perpendicularity |
---|---|---|---|
L≤10 | ±0.03 | 0.04 | 0.5 degree for adjacent sides |
10<L≤25 | ±0.03 | 0.06 | |
25<L≤63 | ±0.04 | 0.10 | |
L>63 | ±0.06 | 0.12 |
2. Disks
OD Dimension (mm) | Tolerance (mm) | Cylindricitym (mm) | Circular Run-out (mm) |
---|---|---|---|
D≤10 | ±0.02 | 0.03 | 0.08 |
10<D≤25 | ±0.02 | 0.03 | 0.08 |
D>25 | ±0.03 | 0.04 | 0.10 |
3. Segments
Item | Dimension (mm) | Tolerance (mm) |
---|---|---|
Thickness | T≤10 | ±0.04 |
10<T≤25 | ±0.05 | |
Length | L≤10 | ±0.03 |
10<T≤25 | ±0.03 | |
25<T≤63 | ±0.04 | |
L>63 | ±0.06 | |
Chordal Length | W≤63 | ±0.05 |
W>63 | ±0.06 |
4. Ring
ID Dimension (mm) | Tolerance (mm) | Coaxiality (mm) |
---|---|---|
d≤3 | ±0.04 | 0.06 |
3<d≤6 | ±0.05 | 0.06 |
d>6 | ±0.05 | 0.10 |
According to different shipping way and Customer’s requirements, we make the most convenient and safe way packing for customers.
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