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These materials span a range of properties that accommodate a wide variety of application requirements. The following is intended to give a broad but practical overview of factors that must be considered in selecting the proper material, grade, shape, and size of magnet for a specific application. The chart below shows typical values of the key characteristics for selected grades of various materials for comparison. These values will be discussed in detail in the following sections.
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Table Magnet Material Comparisons
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Material
|
Grade
|
Br
|
Hc
|
Hci
|
BHmax
|
Tmax (Deg C)*
|
|
NdFeB
|
39H
|
12,800
|
12,300
|
21,000
|
40
|
150
|
|
SmCo
|
26
|
10,500
|
9,200
|
10,000
|
26
|
300
|
|
NdFeB
|
B10N
|
6,800
|
5,780
|
10,300
|
10
|
150
|
|
Alnico
|
5
|
12,500
|
640
|
640
|
5.5
|
540
|
|
Ceramic
|
8
|
3,900
|
3,200
|
3,250
|
3.5
|
300
|
|
Flexible
|
1
|
1,600
|
1,370
|
1,380
|
0.6
|
100
|
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* Tmax (maximum practical operating temperature) is for reference only. The maximum practical operating temperature of any magnet is dependent on the circuit the magnet is operating in.
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