Daido’s NEOQUENCH-P is a series of isotropic polymer bonded magnets based on Nd-Fe-B.
The raw material powder is manufactured by rapid quenching of prescribed alloys into nanocristalline flakes which are subsequently annealed for optimum magnetic properties.
Shortly after the invention of rapidly quenched Nd-Fe-B magnet powders, Daido had started to develop polymer bonded magnets from these powders.
By 1987, Daido had completed the development of high performance, high demensional accuracy bonded Nd-Fe-B utilizing its original manufacturing techniques, such as mixing, injection, coating, and magnetization.
Daido is the first to commercialize injection molded Nd-Fe-B magnets in Japan.
Daido also developed epoxy electrodeposition coating and high heat resistant magnet grades.
Applications of NEOQUENCH-P
NEOQUENCH-P are isotropic bonded magnets.
Unlike anisotropic bonded magnets which require magnetic field alignment, these magnets are not magnetized during the pressing.
Therefore, it is easier to prevent magnetic particle contamination.
Taking advantage of its high cost perfoamance, NEOQUENCH-P is being used in various applications, including personal computers, cell phones, and various sensors.
Forming methods of NEOQUENCH-P
NEOQUENCH-P are formed by either injection molding or compression molding.
Injection molding provides flexible shapes and compression molding provides higher magnetic properties.
Injection Molding
Injection molded magnets are made by injecting the special compound, a mixture of Nd magnet powder and high performance polymer, into the mold. These magnets cover a wide range of characteristics as isotropic bonded magents, including heat resistance and higher performance. Injection molding offers very flexible shape design as well as overmolding and insert molding with other parts for easy and reliable assemblies.
Injeciton molded magnets
Overmolded or insert molded assemblies
Features of injection molded magnets
- Daido’s injection molded magnets have a high level of magnetic properties among Nd based isotropic injection molded magnets.
- Since these are isotropic in nature, any magnetization patterns can be used. This is especially advantageous to multi-pole magnetization.
- Injection molding provides better dimensional accuracy and excellent serial productivity.
- Thin wall thickness (minimum 0.3 mm) and complicated shapes can be produced. *1
- Overmolding and insert molding with other parts, such as back yoke, hub, shaft is readily available, as well as injecting other polymer parts can be incorporated.
- A high volume fraction of polyer binders provide adequate protection against corrosion without additional coating in most applications. *2
※1 Minimum wall thickness depends on the shape and 0.3 mm may not be achieved in some cases. Please consult with our sales staff.
※2 If a surface coating is required or desired for your specific application, please consult with our sales staff as we do have a coating suitable for injection molded magnets.
NEOQUENCH-C is an injection molding compound for NdFeB. High performance magnets can be produced by using NEOQUENCH-C.
2 Shot technology
The 2 shot technology is a method of injection molding where two different materials are consecutively injected for form a single integral product.
Features of 2 shot tehcnology
- Adhesive bonding or other assembly processes can be eliminated.
- Higher geometrical precision (such as concentricity) can be achieved.
- Manufacturing cost saving
Comression molding
Compression molded magnets are made by first mixing the magnetic powder with the polymer binder and then by compressing the mixture in a press mold. These magnets exhibit a higher level of performance than the injection molded couterparts due to higher density.
Compression molded magnets
Compression molded magnets assembled with shaft, yoke and other parts.
Features of compression molded magnets
- Highest level of magnetic performance among Nd-Fe-B isotropic bonded magnets.
- Since these are isotropic in nature, any magnetization patterns can be used. This is especially advantageous to multi-pole magnetization.
- Thin wall thickness (minimum 0.3 mm) can be produced. *1
- Excellent corrosion resistance is realized by Daido original coating technology.
※1 Minimum wall thickness depends on the shape and 0.3 mm may not be achieved in some cases. Please consult with our sales staff.
Detailed property data of NEOQUENCH-P
Material properties of isotropic bonded Nd-Fe-B magnets (NEOQUENCH-P)
Magnetic properties
Compression molded magnets
Compression mold NEOQUENCH-P, Magnetic property of NdFeB bonded magnet
| NP-7L | NP-8 | NP-8L | ||
|---|---|---|---|---|
| Remanence, Br | (mT) | 570 ～ 640 | 580 ～ 650 | 640 ～ 710 |
| (kG) | (5.7 ～ 6.4) | (5.8 ～ 6.5) | (6.4 ～ 7.1) | |
| Coercivity, HCB | (kA/m) | 374 ～ 438 | 390 ～ 454 | 406 ～ 470 |
| (kOe) | (4.7 ～ 5.5) | (4.9 ～ 5.7) | (5.1 ～ 5.9) | |
| Coercivity, HCJ | (kA/m) | 637 ～ 796 | 1035 ～ 1353 | 637 ～ 796 |
| (kOe) | (8.0 ～ 10.0) | (13.0 ～ 17.0) | (8.0 ～ 10.0) | |
| Maximum energy product, (BH)max | (kJ/m3) | 56 ～ 68 | 60 ～ 72 | 68 ～ 80 |
| (MGOe) | (7.0 〜 8.5) | (7.5 ～ 9.0) | (8.5 ～ 10.0) | |
| Recoil permeability | 1.2 | 1.13 | 1.2 | |
| Temperature coefficient of Br, alpha | (%/℃) | -0.12 | -0.15 | -0.1 |
| Required magnetizing field for saturation, Hs | (kA/m) | ≧1592 | ≧1990 | ≧1592 |
| (kOe) | (≧20) | (≧25) | (≧20) | |
| Density | (Mg/m3) | 5.6 ～ 6.1 | 5.6 ～ 6.1 | 5.6 ～ 6.1 |
| (g/cm3) | ||||
| Method of forming | Compression moulding | |||
| NP-8SR | NP-10LL | NP-11L | NP-12L | ||
|---|---|---|---|---|---|
| Remanence, Br | (mT) | 600 ～ 680 | 670～740 | 680 ～ 730 | 720 ～ 770 |
| (kG) | (6.0 ～ 6.8) | (6.7～7.4) | (6.8 ～ 7.3) | (7.2 ～ 7.7) | |
| Coercivity, HCB | (kA/m) | 414 ～ 486 | 398～462 | 430 ～ 485 | 454 ～ 509 |
| (kOe) | (5.2 ～ 6.1) | (5.0～5.8) | (5.4 ～ 6.1) | (5.7 ～ 6.4) | |
| Intrinsic Coercivity, HCJ | (kA/m) | 836〜1075 | 517～677 | 716 ～ 836 | 716 ～ 836 |
| (kOe) | (10.5 ～ 13.5) | (6.5～8.5) | (9.0 ～ 10.5) | (9.0 ～ 10.5) | |
| Maximum energy product, (BH)max | (kJ/m3) | 65 ～ 77 | 76～84 | 80 ～ 88 | 88 ～ 99 |
| (MGOe) | (8.2 〜 9.7) | (9.5～10.5) | (10.0 ～ 11.0) | (11.0 ～ 12.5) | |
| Recoil permeability | 1.13 | 1.26 | 1.2 | 1.2 | |
| Temperature coefficient of Br, alpha | (%/℃) | -0.13 | -0.11 | -0.1 | -0.1 |
| Required magnetizing field for saturation, Hs | (kA/m) | ≧1592 | ≧1592 | ≧1592 | ≧1592 |
| (kOe) | (≧20) | (≧20) | (≧20) | (≧20) | |
| Density | (Mg/m3) | 5.6 ～ 6.1 | 5.9～6.2 | 5.9 ～ 6.2 | 6.1 ～ 6.4 |
| (g/cm3) | |||||
| Method of forming | Compression moulding | ||||
- R: Heat resistant
- SR: Super Heat resistant
- The data in these tables are obtained from Daido’s standard test pieces and are not guranteed values.
- These values may vary depending on the magnet shape, dimensions, test conditions and equipment. It is recommended that the fiqures be verified in actual products.
- Guaranteed values may be set up by consultation for specific shape and sizes.
- The contents of data are subject to change without prior notice.
Injection molded magnets
Injection mold NEOQUENCH-P, Magnetic property of NdFeB bonded magnet
| NPI-4L (NC-4L) |
NPI-6 (NC-6) |
NPI-6L (NC-6L) |
NPI-8L | ||
|---|---|---|---|---|---|
| Remanence, Br | (mT) | 410 ～ 490 | 480 ～ 560 | 540 ～ 620 | 570 ～ 630 |
| (kG) | (4.1 ～ 4.9) | (4.8 ～ 5.6) | (5.4 ～ 6.2) | (5.7 ～ 6.3) | |
| Coercivity, HCB | (kA/m) | 247 ～ 310 | 334 ～ 398 | 342 ～ 406 | 382 ～ 430 |
| (kOe) | (3.1 ～ 3.9) | (4.2 ～ 5.0) | (4.3 ～ 5.1) | (4.8 ～ 5.4) | |
| Intrinsic Coercivity, HCJ | (kA/m) | 573 ～ 732 | 1035 ～ 1353 | 637 ～ 796 | 676 ～ 835 |
| (kOe) | (7.2 ～ 9.2) | (13.0 ～ 17.0) | (8.0 ～ 10.0) | (8.5 ～ 10.5) | |
| Maximum energy product, (BH)max | (kJ/m3) | 28 ～ 36 | 40 ～ 52 | 49 ～ 61 | 59 ～ 67 |
| (MGOe) | (3.5 ～ 4.5) | (5.0 ～ 6.5) | (6.2 ～ 7.7) | (7.4 ～ 8.4) | |
| Recoil permeability | 1.2 | 1.13 | 1.2 | 1.2 | |
| Temperature coefficient of Br, alpha | (%/℃) | -0.1 | -0.15 | -0.1 | -0.1 |
| Required magnetizing field for saturation, Hs | (kA/m) | ≧1592 | ≧1990 | ≧1592 | ≧1592 |
| (kOe) | (≧20) | (≧25) | (≧20) | (≧20) | |
| Density | (Mg/m3) | 4.2 ～ 4.9 | 5.0 ～ 5.5 | 5.0 ～ 5.5 | 5.0 ～ 5.5 |
| (g/cm3) | |||||
| Method of forming | Injection mold | ||||
| NPI-9L (NC-9L) |
NPI-6LR (NC-6LR) |
NPI-6SR | NPI-7LR | NPI-7SR | ||
|---|---|---|---|---|---|---|
| Remanence, Br | (mT) | 640 ～ 720 | 480 ～ 560 | 460 ～ 520 | 550 ～ 610 | 520 ～ 580 |
| (kG) | (6.4 ～ 7.2) | (4.8 ～ 5.6) | (4.6 ～ 5.2) | (5.5 ～ 6.1) | (5.2 ～ 5.8) | |
| Coercivity, HCB | (kA/m) | 398 ～ 462 | 302 ～ 366 | 310 ～ 374 | 366 ～ 414 | 350 ～ 398 |
| (kOe) | (5.0 ～ 5.8) | (3.8 ～ 4.6) | (3.9 ～ 4.7) | (4.6 ～ 5.2) | (4.4 ～ 5.0) | |
| Intrinsic Coercivity, HCJ | (kA/m) | 637 ～ 796 | 637 ～ 796 | 835 ～ 1075 | 637 ～ 769 | 836 ～ 1075 |
| (kOe) | (8.0 ～ 10.0) | (8.0 ～ 10.0) | (10.5 ～ 13.5) | (8.0 ～ 10.0) | (10.5 ～ 13.5) | |
| Maximum energy product, (BH)max | (kJ/m3) | 68 ～ 76 | 36 ～ 48 | 37 ～ 45 | 52 ～ 60 | 47 ～ 56 |
| (MGOe) | (8.5 ～ 9.5) | (4.5 ～ 6.0) | (4.6 ～ 5.6) | (6.5 ～ 7.5) | (5.9 ～ 7.0) | |
| Recoil permeability | 1.2 | 1.2 | 1.13 | 1.2 | 1.13 | |
| Temperature coefficient of Br, alpha | (%/℃) | -0.1 | -0.1 | -0.13 | -0.1 | -0.13 |
| Required magnetizing field for saturation, Hs | (kA/m) | ≧1592 | ≧1592 | ≧1592 | ≧1592 | ≧1592 |
| (kOe) | (≧20) | (≧20) | (≧20) | (≧20) | (≧20) | |
| Density | (Mg/m3) | 4.6 ～ 5.1 | 4.6 ～ 5.1 | 5.5 ～ 6.0 | 5.0 ～ 5.5 | 5.0 ～ 5.5 |
| (g/cm3) | ||||||
| Method of forming | Injection mold | |||||
- (NC): Compound for Injection Molding
- R: Heat resistant
- SR: Super Heat resistant
- This table shows measurement data byDaido’s standard test pieces and not guranteed values.
- Moreover, since the above mentioned value is varied depending on magnet shape, its dimensions, test conditions and equipments. It is recommended that the fiqures be certified in actual products.
- The guarantee value would be consulted and set by the shape & size.
- The contents of data may change without prior notice.
Physical & mechanical properties
NEOQUENCH-P is a series of NdFeB bonded magnets using certain polymers as a binder. When exposed to heat, physical, mechanical, or dimensional changes may occur. Please test the products in the specific environment before actual use.
Compression molded magnets
Physical & Mechanical property NP-8, 8L, 8SL
| Item | Unit | NP-8,8L, NP-11,12L |
NP-8SR |
|---|---|---|---|
| Electric resistivity (JIS C2525) |
μΩ・m | 56 | 31 |
| μΩ・cm | 5600 | 3100 | |
| Thermal Expansion Coefficient (JIS K7179) |
10-6/℃ | 10 | 7 |
| (30～100℃) | |||
| Bending strength (JIS K7171) |
MPa | 52 | 52 |
| (kgf/mm2) | 5.3 | 5.3 | |
| Bending Modulus (JIS K7171) |
MPa | 10800 | 10800 |
| (kgf/mm2) | 1100 | 1100 | |
| Ring Crushing Strength (JIS Z2507) |
MPa | 54 | 54 |
| (kgf/mm2) | 5.5 | 5.5 |
Injection molded magnets
Physical & Mechanical property NPI-6, 6L, 6SR
| Item | Unit | NPI-4L,6L, NPI-6,8L,9L |
NPI-6SR,6LR NPI-7SR,7LR |
|---|---|---|---|
| Electric resistivity (JIS C2525) |
μΩ・m | 130 | 130 |
| μΩ・cm | 13000 | 13000 | |
| Thermal Expansion Coefficient (JIS K7179) |
10-6/℃ | 26 | 21 |
| (30～100℃) | |||
| Bending strength (JIS K7171) |
MPa | 74 | 71 |
| (kgf/mm2) | 7.6 | 7.2 | |
| Bending Modulus (JIS K7171) |
MPa | 15700 | 24200 |
| (kgf/mm2) | 1600 | 2470 | |
| Ring Crushing Strength (JIS Z2507) |
MPa | 50 | 50 |
| (kgf/mm2) | 5.1 | 5.1 | |
| Hardness (JIS K7202) |
HRM | 70 | 107 |
| Tensile Strength (JIS K7113) |
MPa | 37 | 33 |
| (kgf/mm2) | 3.8 | 3.4 | |
| Young’s modulus (JIS K7113) |
MPa | 16000 | 25000 |
| (kgf/mm2) | 1630 | 2550 |
Examples of overmolding and insert molding
- Overmolding NEOQUENCH-P to the shaft or yoke material
- Overmolding or insert molding of NEOQUENCH-P to pressed parts or high end resin parts.
- Compression molding NEOQUENCH-P with high end resin parts.
- Overmolding or insert molding high end resin to compression molded NEOQUENCH-P and shafts and other parts.
Magnetic properties of isotropic bonded Nd-Fe-B magnets (NEOQUENCH-P)
Demagnetization curves
Comperssion molded magnets
Injection molded magnets
Thermal demagnetization
Comperssion magnet
・NP-8
・NP-8L
Injection mold magnet
・NPI-6
・NPI-6L
Thermal demagnetization of super heat resistant grades
Comperssion magnet
・NP-8SR
Injection mold magnet
・NPI-6SR
Magnetization properties of isotropic bonded Nd-Fe-B magnets (NEOQUENCH-P)
Magnetization field and magnetic properties
Compression molded magnets
Injection molded magnets
Examples of magnetization waveforms
Magnet sample shape: OD 22.8 × ID 21.8 × 6 mm L
Magnet grade: NP-8L, ID 12 poles without back yoke
Magnet sample shape: OD 23 × ID 21 × 12 mm L
Magnet grade: NP-8L, OD 24 poles
Magnet sample shape: OD 23 × ID 21 × 12 mm L
Magnet grade: NP-8L, OD48 poles
Magnet sample shape: OD 6 × ID 3 × 7 mm L
Magnet grade: NP-8L, OD 10 poles
Coatings for isotropic bonded Nd-Fe-B magnets (NEOQUENCH-P)
Compression molded magnets kept in dry air will be rust free for a long time. However, in a humid environment, the moisrure in the air will cause rust on the surface.
Therefore surface coating is necessary for most applications. Daido provides 5 types of coatings for your specific shape and use environment.
Due to higher polymer binder content, injection molded magnets have higher corrosion resistance and in most cases can be used without coatings.
| Coating method | Coating thickness (µm) |
Corrosion resistance Time to rust formation in humidity test (hours) |
Application shape | ||
|---|---|---|---|---|---|
| 60℃×95%R.H. | 80℃×95%R.H. | ||||
| Resin coating | Electrodeposition coating (epoxy) | 20 ～ 35 | 500 | 300 | Various shapes |
| Spray coating (epoxy) | 15 ～ 30 | 400 | 200 | Various shapes | |
| Dip coating (epoxy) | 1 ～ 5 | 100 | 50 | Small parts | |
| Barrel spray coating (epoxy) |
3 ～ 18 | 200 | 100 | Small parts | |
| Metal plating | Ni plating | 10 ～ 30 | 500 | 300 | Various shapes |
※Please consult with our sales staff for details.
Note for using NEOQUENCH-P
- Magnet is generally easy to crack. Please protect your eyes from splinter not to get injure.Since this magnet has strong power to pull each other, please notice not to place the hand.
- Magnet is fragile, once it got crack or chipping, it might lead lower characteristic or strength deterioration. In case of high rpm motor, even its magnet got broken, please design for the rotor not to scutter splinter.
- Please notice that even unmagnetized magnet sometimes absorbs tiny magnetic substance. When you mount a magnet, please use asembled parts after washing it.
- Approaching strong magnet might destroy records of magnetic media. Please do not bring magnet close to magnetic card, magnetic tape, prepaid card, and so on.
- Getting magnet close to electronic devices, scale meter board, control board might get out of order and broken or accident. Please keep magets away from it.
- It is very dangerous to bring magnet close to the person who wear an electronic medical device such as a pacemaker. Please keep magnets away from the person, or medical device might get affected and doesn’t work properly.
- Please don’t use or keep in the environments such as high humidity and high temperature. The magnets might get rust or deterioration of performance and mechnical strength. Rust proof depends upon the surface coating, please consult with us beforehand.
- Corrosive gas atmosphere (Cl, NH3, SOx, NOx…)
- High electro-conductivity (Electrolyte water …)
- Hydrogen gas atmosphere (H2, …)
- Acid, Alkali, Organic solvent
- Water, Oil, …
- Ni-plating would be needed to protect surface on the magnet from rust up to the working environment. Nd-Fe-B magnet needs to be coated or special treatment in many cases. Please select appropriate surface treatment to cope with the working environment.
- The rare earth alloy magnetic powder is classified as dangerous materials (flammable solid) in the Japanese Fire Services Act. Please do not use when there is possibilities of generating magnetic powder dust, because the finer dust is easy to catch fire.
- Dust caused by friction while magnet using or machinning, is easy to get fire. So please not to use the magnet where it generate magnetic dust in the air.
- Please don’t swallow magnet by mistake.If you swallow it by any chance, please consult with the doctor immediately.
- Please keep the magnet away from the place children can reach.
- Please keep the magnet away from especially the person who has metalic alergy, since touching magnet might cause skin trouble or swells in red. If you get symptom like this, please don’t touth magnets.