Magnetic Performance Parameters

Sintered Neodymium Magnet Grades:

Many grades of Neodymium magnets exist to support a variety of industrial applications. The range of Neo grades typically extends from 33 MGOe to 52 MGOe. This range allows for optimizing cost, performance, and operational temperature resistance.

The typical convention for “Grade” is to use the value of the particular magnet alloy’s Energy Density or Maximum Energy Product. Oftentimes there are letters or a two digit number suffix attached to the Grade which indicates the Intrinsic Coercive Force (Hci) level of the magnet alloy. This Hci is a good indicator of the maximum allowable temperature a particular Neo alloy can tolerate before irreversible demagnetizing occurs.

The higher the “Grade number” then the higher the Energy Density. Usually the higher the Energy Density the stronger the magnet, but this is very much dependent upon the magnet’s operational environment.

1.Magnetic Property Distribution Chart:

Magnetic Property Distribution

Magnetic Property Distribution

 

2.Magnetic Properties of Sintered NdFeB Magnets:

3. Typical Physical Properties:

Bonded Neodymium Magnet Grades:

performance parameter of bonded ndfeb magnet

performance parameter of bonded ndfeb magnet

Magnetic Characteristic and Physical Properties Of Bonded Neodymium Magnet:

 

COMPRESSION MOLDED BONDED NEODYMIUM GRADES​

Grade

Residual Induction
Br T(KG)

Coercive Force
bHc KA/m (KOe)

Intrinsic Coercive Force
iHc KA/m (KOe)

Maximum Energy Product
(BH)max KJ/m^3 (MGOe)

Density D
g/cm^3

Reversible Permeability

Reversible Temp Coefficient A
Br%/°C

Max Operating Temp

BNP-2

300-400
(3.0-4.0)

160-240
(2.0-3.0)

440-600

(5.5-7.5)

19-26
(2.4-3.3)

  5.6-6.0

1.20

-0.11

   160

BNP-3

400-510
(4.0-5.1)

216-280
(2.7-3.5)

504-680
(6.3-8.5)

24-32
(5.6-6.0)

  5.6-6.0

1.20

-0.11

   160

BNP-4

460-520
(4.6-5.2)

224-288
(2.8-3.6)

504-680
(6.3-8.5)

30-35
(3.8-4.4)

  5.6-6.0

1.20

-0.11

   160

BNP-5

470-550
(4.7-5.5)

240-360
(3.0-4.5)

520-680
(6.5-8.5)

37-44
(4.7-5.5)

  5.6-6.0

1.20

-0.11

   160

BNP-6

650-700
(6.5-7.0)

456-512
(5.7-6.4)

600-720
(7.5-9.0)

80-96
(10-12)

  5.6-6.0

1.20

-0.11

   160

BNP-7

550-650
(5.5-6.5)

320-408
(4.0-5.1)

560-680
(7.0-8.5)

52-64
(6.5-8.0)

  5.6-6.0

1.20

-0.11

   160

BNP-8

620-670
(6.2-6.7)

400-456
(5.0-5.7)

640-800
(8.0-10.0)

64-76
(8.0-9.5)

  5.8-6.2

1.20

-0.11

   160

BNP-8A

620-680
(6.2-6.8)

400-480
(5.0-6.0)

1040-1280
(13.0-16.0)

65-73
(8.2-9.2)

  5.8-6.1

1.20

-0.10

   180

BNP-9L

650-700
(6.5-7.0)

360-416
(4.5-5.2)

520-640
(6.5-8.0)

68-75
(8.6-9.4)

  5.8-6.1

1.20

-0.11

   120

BNP-9

650-700
(6.5-7.0)

416-456
(5.2-5.7)

680-800
(8.5-10.0)

68-76
(8.5-9.5)

  5.8-6.2

1.20

-0.12

   160

BNP-9H

650-700
(6.5-7.0)

432-488
(5.4-6.1)

920-1040
(11.5-13.0)

71-80
(8.9-10.0)

  5.8-6.1

1.20

-0.10

   180

BNP-10H

650-710
(6.5-7.1)

432-480
(5.4-6.0)

764-960
(9.8-12.0)

74-82
(9.3-10.3)

  5.8-6.1

1.20

-0.10

   180

BNP-10

670-720
(6.7-7.2)

424-480
(5.3-6.0)

640-800
(8-10)

76-84
(9.5-10.5)

  5.8-6.2

1.20

-0.10

   160

BNP-11

680-740
(6.8-7.4)

400-480
(5.0-6.0)

640-800
(8-10)

80-88
(10-11)

  6.0-6.2

1.20

-0.10

   180

BNP-12D

720-770
(7.2-7.7)

440-520
(5.5-6.5)

720-880
(9.0-11.0)

88-96
(11.0-12.0)

  6.1-6.3

1.20

-0.10

   160

BNP-12L

730-770
(7.3-7.7)

368-432
(4.6-5.4)

520-640
(6.5-8.0)

80-88
(10.0-11.0)

  6.0-6.3

1.20

-0.12

   120

BNP-13L

780-830
(7.8-8.3)

400-80
(5.0-6.0)

480-640
(6.0-8.0)

88-104
(11.0-13.0)

  6.1-6.4

1.20

-0.12

   120

INJECTION MOLDED BONDED NEODYMIUM GRADES

Grade

Residual Induction
Br T(KG)

Coercive Force
bHc KA/m (KOe)

Intrinsic Coercive Force
iHc KA/m (KOe)

Maximum Energy Product
(BH)max KJ/m^3 (MGOe)

Density D
g/cm^3

Reversible Permeability

Reversible Temp Coefficient A
Br%/°C

Max Operating Temp

BNI-3

350-450

(3.5-4.5)

200-280

(2.5-3.5)

400-640

(5.0-8.0)

20-28

(2.5-3.5)

4.5-5.0

1.20

-0.11

   120
BNI-4

400-500

(4.0-5.0)

240-320

(3.0-4.0)

560-720

(7.0-9.0)

28-36

(3.5-4.5)

4.5-5.0

1.20

-0.11

   120
BNI-5

450-550

(4.5-5.5)

304-360

(3.8-4.5)

640-800

(8.0-10.0)

36-44

(4.5-5.5)

4.5-5.1

1.20

-0.11

   120
BNI-5SR

450-550

(4.5-5.5)

320-400

(4.0-5.0)

880-1120

(11.0-14.0)

36-44

(4.8-5.5)

4.8-5.3

1.20

-0.11

   180
BNI-6

500-600

(5.0-6.0)

328-384

(4.1-4.8)

640-800

(8.0-10.0)

44-52

(5.5-6.5)

4.7-5.2

1.20

-0.11

   120
BNI-6SR

500-600

(5.0-6.0)

320-400

(4.0-5.0)

880-1120

(11.0-14.0)

44-52

(5.5-6.5)

4.9-5.4

1.20

-0.11

   180
BNI-7

550-650

(5.5-6.5)

344-400

(4.3-5.0)

640-800

(8.0-10.0)

52-60

(6.5-7.5)

4.7-5.3

1.20

-0.12

   120

 

SmCo

Samarium Cobalt magnets (SmCo) is the sister Rare Earth Magnet to NdFeB. SmCo is sometimes called a Rare Earth Cobalt magnet. SmCo magnets exist in two alloy varieties.Samarium Cobalt Magnet Grades:

Sm1Co5 (SmCo1:5) is the original SmCo alloy.
Sm2Co17 (SmCo2:17) is the more common used and stronger SmCo alloy with SmCo26 being the most popular variety.
Sm1Co5 contains mainly Sm and Co and contains no iron (Fe) so it has excellent corrosion resistance -it should never corrode with water.

Sm2Co17 is mainly Sm and Co but also contains Cu, Hf &/or Zr, sometimes Pr, and Fe. The low free iron content in Sm2Co17 means it is technically prone to a little surface corrosion when in water.

Sm2Co17 is regarded as having good to very good corrosion resistance (far superior to NdFeB) in most applications. A simple coating of NiCuNi will very likely solve any risk of corrosion.

1, Magnetic Property

Sm1Co5 grade

Sm1Co5 grade

Sm2Co17 grade

Sm2Co17 grade

2, Corrosion Resistance

Corrosion resistance:- SmCo(1:5) Exellent (has no iron); SmCo(2:17) Good to Very Good (has some free iron). SmCo magnets can usually be used in humid applications without any need for a protective coating. In wet envrironments, coating of SmCo(2:17) in NiCuNi is recommended to avoid surface corrosion issues. NiCuNi plated SmCo is claimed by some to limit chipping and allows for soldering as well but is rarely done.

Physical Characteristics (excluding bonded variants)

Physical Characteristics of SmCo

Physical Characteristics of SmCo

Alnico Magnet Grades:

The range of Alnico magnet alloy grades available from MPCO Magnetics typically extends from 1.5 – 5.25 MGOe for sintered Alnico and 5.0 – 9.0 for cast Alnico. This range allows for optimizing the cost, performance, and operational temperature resistance for a wide range of applications.

Sintered Alncio magnets are made with a powdered metal process. Lower grades are Isotropic, which can be magnetized in any direction, but at a loss of magnetic strength. The powder metal version of Alnico allows for easier integration of features since a tool is used and the magnet is finished to near net shape. (Sometimes the tooling cost can be a project inhibitor for small production quantities.) Cast Alnico magnets are cast in sand molds and usually require finish grinding. Casting Alnico is the most typical manufacturing method and most cast Alncio is “orientated” and anisotropic. This means that the magnet can only be magnetized in one direction, but this improves the magnetic strength.

Sintered Alnico – Available Grades
Grade Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
Max.
Operating
Temp.*
Nominal Nominal Minimum Nominal Nominal
k-Gauss Tesla Oersted kA/m Oersted kA/m MGOe kJ/m3 °C °F
Alnico 2 7.0 0.7 500 40 540 43 1.5 12 450°C 840°F
Alnico 5 11.0 1.1 600 48 600 48 4.25 34 450°C 840°F
Alnico 8 8.8 0.88 1,530 121 1.600 127 5.25 42 450°C 840°F
* The listed maximum operating temperatures are based on an adequate Length to Diameter ratio or a properly designed magnetic circuit. The listed values are for reference and validation must occur before one chooses a design path.

 

Cast Alnico – Available Grades
Grade Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
Max.
Operating
Temp.*
Nominal Nominal Minimum Nominal Nominal
k-Gauss Tesla k-Oersted kA/m k-Oersted kA/m MGOe kJ/m3 °C °F
Alnico 5 12.2 1.22 600 48 630 50 5.0 40 500°C 930°F
Alnico 5B 12.2 1.22 650 52 660 53 5.5 44 500°C 930°F
Alnico 5 DG 12.5 1.25 690 55 700 56 6.5 52 500°C 930°F
Alnico 5-7 13.0 1.3 700 56 740 59 7.5 60 525°C 980°F
Alnico 8-HC 7.0 0.7 1,750 139 1,750 139 4.5 36 525°C 980°F
Alnico 8 8.2 0.82 1,500 119 1,600 127 5.0 40 525°C 980°F
Alnico 8B 8.8 0.88 1,500 119 1,650 131 5.5 44 525°C 980°F
Alnico 8C 9.0 0.9 1,380 110 1,440 115 7.5 60 525°C 980°F
Alnico 9 10.5 1.05 1,410 112 1,440 139 9.0 72 525°C 980°F
* The listed maximum operating temperatures are based on an adequate Length to Diameter ratio or a properly designed magnetic circuit. The listed values are for reference and validation must occur before one chooses a design path.

 

Reversible Temperature Coefficient for Cast and Sintered Alnico
Temperature Range
(°C)
Induction Br (α)
(%)/°C
Intrinsic Coercivity Hci (β)
(%)/°C
20°C to 150°C -0.02 to -0.03 -0.02 to -0.03
α = Δ Br / Δ T * 100 (Br @ 20°C) [ΔT = 20°C – 150°C]
β = Δ Hci / Δ T * 100 (Hci @ 20°C) [ΔT = 20°C – 150°C]

 

Alnico Magnets – Physical Properties
Property Units Value Sintered Alnico Value Cast Alnico
Vickers Hardness Hv 440 440-620
Density g/cm3 6.8 – 7.0 6.9 – 7.3
Curie Temp TC °C 810 – 860 740 – 860
Curie Temp TF °F 1,400 – 1,580 1,460 – 1,580
Specific Resistance μΩ⋅Cm 50- 70 45 – 75
Bending Strength kN/mm2 0.35 – 0.76 0.05 – 0.31
Tensile Strength kN/mm2 0.35- 0.45 0.02 – 0.15
Thermal Expansion °C-1 +11.0 to +12.4 x10-6 +11.0 to +13.0 x10-6
The listed values are approximate and should be used as a reference. Any magnetic or physical characteristics should be substantiated before selecting a magnet material.

Hard Sintered Ferrite & Ceramic Magnet Grades:

Magnetic properties of Sintered Ferrite Magnet (ceramic magnets, Hard ferrite magnet)
Chinese standard
Material
Br
Hcb
Hcj
(BH)max
mT
KGs
KA/m
KOe
KA/m
KOe
KJ/m3
MGOe
Y10T 200~235 2.0~2.35 125~160 1.57~2.01 210~280 2.64~3.52 6.5~9.5 0.8~1.2
Y20 320~380 3.2~3.8 135~190 1.70~2.38 140~195 1.76~2.45 18.0~22.0 2.3~2.8
Y22H 310~360 3.1~3.6 220~250 2.77~3.14 280~320 3.52~4.02 20.0~24.0 2.5~3.0
Y23 320~370 3.2~3.7 170~190 2.14~2.38 190~230 2.39~2.89 20.0~25.5 2.5~3.2
Y25 360~380 3.6~4.0 135~170 1.70~2.14 140~200 1.76~2.51 22.5~28.0 2.8~3.5
Y26H 360~390 3.6~3.9 220~250 2.77~3.14 225~255 2.83~3.21 23.0~28.0 2.9~3.5
Y27H 370~400 3.7~4.0 205~250 2.58~3.14 210~255 2.64~3.21 25.0~29.0 3.1~3.7
Y30 370~400 3.7~4.0 175~210 2.20~2.64 180~220 2.26~2.77 26.0~30.0 3.3~3.8
Y30BH 380~390 3.8~3.90 223~235 2.80~2.95 231~245 2.90~3.08 27.0~30.0 3.4~3.7
Y30-1 380~400 3.8~4.0 230~275 2.89~3.46 235~290 2.95~3.65 27.0~32.0 3.4~4.0
Y30H-2 395~415 3.95~4.15 275~300 3.46~3.77 310~335 3.90~4.21 28.5~32.5 3.5~4.0
Y32 400~420 4.0~4.2 160~190 2.01~2.38 165~195 2.07~2.45 30.0~33.5 3.8~4.2
Y33 410~430 4.1~4.3 220~250 2.77~3.14 225~255 2.83~3.21 31.5~35.0 4.0~4.4
Y35 400~410 4.00~4.10 175~195 2.20~2.45 180~200 2.26~2.51 30.0~32.0 3.8~4.0
USA standard
Material
Br
Hcb
Hcj
(BH)max
mT
KGs
KA/m
KOe
KA/m
KOe
KJ/m3
MGOe
C1 230 2.3 148 1.86 258 3.5 8.36 1.05
C5 380 3.8 191 2.4 199 2.5 27 3.4
C7 340 3.4 258 3.23 318 4.00 21.9 2.75
C8(=C8A) 385 3.85 235 2.95 242 3.05 27.8 3.5
C8B 420 4.2 232 2.913 236 2.96 32.8 4.12
C9 380 3.8 280 3.516 320 4.01 26.4 3.32
C10 400 4.0 288 3.617 280 3.51 30.4 3.82
C11 430 4.3 200 2.512 204 2.56 34.4 4.32
Europe standard
The standard from International Electronics Committee (IEC404-8-1)
O×100=Y10T=C1   ×300=Y30=C5   O×330=Y30 BH
Grade
Allowed Value (min-typical)
Br
Hcb
BrHcj
(BH)max
mT
KGs
KA/m
KOe
KA/m
KOe
KJ/m3
MGOe
HF8/22 200-220 2.00-2.20 125-140 1.57-1.76 220-230 2.76-2.89 6.5-6.8 0.8-1.1
HF20/19 320-333 3.20-3.33 170-190 2.14-2.39 190-200 2.39-2.51 20.0-21.0 2.5-2.7
HF20/28 310-325 3.10-3.25 220-230 2.76-2.89 280-290 3.52-3.64 20.0-21.0 2.5-2.7
HF22/30 350-365 3.50-3.65 255-265 3.20-3.33 290-300 3.64-3.77 22.0-23.5 2.8-3.0
HF24/16 350-365 3.50-3.65 155-175 1.95-2.20 160-180 2.01-2.26 24.0-25.5 3.0-3.2
HF24/23 350-365 3.50-3.65 220-230 2.76-2.89 230-240 2.89-3.01 24.0-25.5 3.0-3.2
HF24/35 360-370 3.60-3.70 260-270 3.27-3.39 350-360 4.40-4.52 24.0-25.5 3.0-3.2
HF26/16 370-380 3.70-3.80 155-175 1.95-2.20 160-180 2.01-2.26 26.0-27.0 3.2-3.4
HF26/18 370-380 3.70-3.80 175-190 2.20-2.39 180-190 2.26-2.39 26.0-27.0 3.3-3.4
HF26/24 370-380 3.70-3.80 230-240 2.89-3.01 240-250 3.01-3.14 26.0-27.0 3.3-3.4
HF26/26 370-380 3.70-3.80 230-240 2.89-3.01 260-270 3.27-3.39 26.0-27.0 3.3-3.4
HF26/30 385-395 3.85-3.95 260-270 3.27-3.39 300-310 3.77-3.89 26.0-27.0 3.3-3.4
HF28/26 385-395 3.85-3.95 250-265 3.14-3.33 260-275 3.27-3.45 28.0-30.0 3.5-3.8
HF28/28 385-395 3.85-3.95 260-270 3.27-3.39 280-290 3.50-3.60 28.0-30.0 3.5-3.8
HF30/26 395-405 3.95-4.05 250-260 3.14-3.33 260-270 3.27-3.39 30.0-31.5 3.8-3.9
HF32/17 410-420 4.10-4.20 160-180 2.01-2.26 165-175 2.07-2.20 32.0-33.0 4.0-4.1
HF32/22 410-420 4.10-4.20 215-225 2.70-2.83 220-230 2.76-2.89 32.0-33.0 4.0-4.1
HF32/25 410-420 4.10-4.20 240-250 3.01-3.14 250-260 3.14-3.27 32.0-33.0 4.0-4.1

 

 

Ceramic Magnets – Physical Properties
Property Units Value Ceramic (Strontium Ferrite)
Vickers Hardness Hv ~ 1160 (7 Mohs)
Density g/cm3 4.5 to 5.1
Curie Temp TC °C 450 to 460
Curie Temp TF °F 840 to 860
*Specific Resistance μΩ⋅Cm > 106
Bending Strength kN/mm2 0.05 – 0.09
Tensile Strength kN/mm2 .02 to .05
Thermal Expansion (∥) °C-1 +11.0 to +16.0 x10-6
Thermal Expansion (⊥) °C-1 ‘+7.0 to +15.0 x 10-6
* The effective resistance may change based on the powder blend. Barium Ferrite has higher resistivity than Strontium Ferrite. Some Ceramic magnets are a blend. To ensure the correct design path is chosen execute due diligence by evaluating the magnet alloy on a case by case basis.

 

Injection Bonded Ferrite & Ceramic Magnet Grades:

 

Magnetic Properties of Injection Ferrite Bonded Magnet
TYPE NO. Binder Magnet Material Br
(mT)
Gs
HCB
(kA/m)
Oe
HCJ
(kA/m)
Oe
(BH)max
kJ/m3
MGOe
Density
(g/cm3)
Usage
FBP-1210 Nylon6 Ba ferrite 65~75 40~48 190~230 0.6~0.8 2.4~2.5 PCM for TV Monitor
Sr ferrite 650~750 503~603 2400~2890 0.07~0.1
FBP-1211 Nylon6 Ba ferrite 110~130 70~85 190~230 1.5~3.0 2.7~3.2 Isotropic injection magnet
Nylon12 Sr ferrite 1100~1300 880~1068 2400~2890 0.19~0.38
FBP-1212 Nylon6 Ba ferrite 130~150 85~105 190~230 3.0~4.2 3.2~3.7 Isotropic injection magnet
Nylon12 Sr ferrite 1300~1500 1070~1320 2400~2890 0.38~0.53
FBP-1213 Nylon6 Ba ferrite 210~240 120~170 160~230 7.0~12.0 3.0~3.5 Anisotropic injection magnet
Nylon12 Sr ferrite 2100~2400 1510~2140 2010~2890 0.88~1.5
FBP-1214 Nylon6 Ba ferrite 250~260 164~174 210~230 11.9~12.5 3.35~3.55 Anisotropic injection magnet
Nylon12 Sr ferrite 2500~2600 2060~2190 2640~2890 1.5~1.57
FBP-1215 Nylon6 Sr ferrite 250~260 174~184 230~280 12.1~12.7 3.35~3.55 Anisotropic injection magnet
Nylon12 2500~2600 2190~2310 2890~3520 1.52~1.6
FBP-1216 Nylon6 Sr ferrite 250~260 184~194 280~320 12.3~12.9 3.35~3.55 Anisotropic injection magnet
Nylon12 2500~2600 2310~2440 3520~4000 1.55~1.62
FBP-1217 Nylon6 Sr ferrite 270~280 170~190 210~230 14.3~14.9 3.5~3.65 Anisotropic injection magnet
Nylon12 2700~2800 2140~2390 2640~2890 1.8~1.87
FBP-1218 Nylon6 Sr ferrite 270~280 180~200 230~280 14.4~15.0 3.5~3.65 Anisotropic injection magnet
Nylon12 2700~2800 2260~2390 2890~3520 1.80~1.88
FBP-1219 Nylon6 Sr ferrite 270~280 190~200 280~320 14.5~15.1 3.5~3.65 Anisotropic injection magnet
Nylon12 2700~2800 2390~2510 3520~4000 1.82~1.89
FBP-1220 Nylon6 Sr ferrite 275~285 180~200 210~250 14.7~15.5 3.60~3.70 Anisotropic injection magnet
Nylon12 2750~2850 2260~2510 2640~3140 1.85~1.95
FBP-1221 Nylon6 Sr ferrite 285~295 190~210 210~250 15.5~17.0 3.65~3.75 Anisotropic injection magnet
Nylon12 2850~2950 2390~2640 2640~3140 1.95~2.14
FBP-1222 PPS Sr ferrite 245~265 170~180 210~250 11.0~13.0 3.48~3.65 Anisotropic injection magnet
2450~2650 2140~2260 2640~3140 1.38~1.63
Physical Characteristics of Injection Bonded Ferrite Magnet
NO. Density (g/cm3) Tension Strength (Kg/cm2) Bend Strength (Kg/cm2) Impact Strength (Kg×cm/cm2) Hardness (Rsc) Water Absorption (%) Heat Distortion Temp (°C)
FBP-1210 2.5~2.7 630 1000 25.0 102 0.07 110
FBP-1211 2.7~3.0 630 1100 25.0 103 0.07 110
FBP-1212 2.6~2.9 630 1100 24.0 103 0.07 115
FBP-1213 3.0~3.5 630 1100 23.0 104 0.07 113
FBP-1214 3.1~3.5 630 1200 23.0 116 0.07 117
FBP-1215 3.35~3.55 630 1150 23.0 110 0.07 117
FBP-1216 3.35~3.55 600 1150 21.0 112 0.05 118
FBP-1217 3.5~3.65 550 1200 20.0 112 0.05 120
FBP-1218 3.5~3.65 550 1200 19.0 114 0.05 120
FBP-1219 3.5~3.65 500 1200 17.0 115 0.04 125
FBP-1220 3.60~3.70 470 900 12.0 115 0.04 128
FBP-1221 2.65~3.75 450 800 12.0 115 0.04 135
FBP-1222 3.48~3.65 430 800 8.5 115 0.04 137