To question about the use of hard magnetic alloys based of Nd-Fe-B in magnetic focusings systems of elektrovakuum devices

The paper presents the results of investigation of magnetic, physico-mechanical and operation parameters of sintered magnets of composition (at. %) Sm
_0.45
Pr
_0.16
Gd
_0.26
Dy
_0.13
(Co
_0.686
Cu
_0.08
Fe
_0.20
Zr
_0.028
Be
_0.006
)
_7.35
(Sm) Nd
₁₂
Tb
_2.6
Fe
_ocr.
Co
₁₅
Ga
_0.4
B
₈
(Nd) /at. %/. Magnetic properties of magnets Sm and Nd have the following values: B
_r
(T) - 0.93, 1.04;
_i
H
_c
(kA/m) - 1824, 1440;
_b
H
_c
(kA/m) - 700, 808; (BH)
_max
(kJ/m
³
) - 162, 208; alpha
<sup>(295-495

K)</sup>
: -0.010, -0.070. The analysis with the aim to compare the investigated alloys with magnets of RCo
₅
type has been made (Sm
_12.5
Gd
_3.3
Er
_1.9
Co
_82.3
).