Table of Properties for SmCo Magnets

Magnetic Properties
Physical and Thermal Properties

 

 

 

 


Magnetic Properties
Grade
Br (Gauss)
Hc (Oersteds)
Hci (Oersteds)
BHmax (MGOe)
Maximum Operating Temperature (C)

Temperture Coefficient of Br
(%/
C)

Density (Lb/in3)
B15S
7,950
6,100
10,500
14
150
-0.04
0.253
18
8,600
7,200
9,000
18
250
-0.04
0.300
22
9,850
8,750
12,000
22
250
-0.03
0.300
26
10,500
9,200
10,000
26
350
-0.03
0.300
26H
10,600
9,250
11,500
27
350
-0.03
0.300
26HS
10,600
9,800
18,000
27
380
-0.03
0.300
27H
11,000
10,300
26,000
28
350
-0.03
0.300
28
10,700
10,300
18,000
28
350
-0.03
0.300
32H
11,600
9,500
14,000
31
350
-0.03
0.300


Physical and Thermal Properties

Description SmCo 1-5 Alloys SmCo 2-17 Alloys NdFeB
Mechanical Properties:
Modulus of elasticy
23 x 106 psi
17 x 106 psi
22 x 106 psi
Ultimate tensile strength
6 x 103 psi
5 x 103 psi
12 x 103 psi
Density
8.2 g/cc
8.4 g/cc
7.4 g/cc
Coefficient of thermal expansion:
Perpendicular to orientation
13 x 10-6/C
11 x 10-6/C
-4.8 x 10-6/C
Parallel to orientation
6 x 10-6/C
8 x 10-6/C
3.4 x 10-6/C
Electrical resistivity
5 ohm cm
86 ohm cm
160 ohm cm
Magnetic Properties:
Curie temperature
750C
825C
310C
Reversible temperature coefficient of residual induction (-100C to + 100C)
-0.043% / C
-0.03% /C
-0.09 to -0.13% /C
Recoil permeability
1.05
1.05
1.05
Max. service temperature*
250C
300C
150C
* Maximum Service Temperature depends on permeance coefficient of magnetic circuit. Temperatures shown here are guidelines only