Page 10 - Дисертація_Борух

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composition of the sintered alloy has not changed: it consists of a Nd 2(Fe, Zr) 14B

phase and a phase rich in Nd.

Grinding of SmCo 4,8Zr 0,2 alloy at frequencies  from 100 to 300 rpm,

duration from 6 to 72 hours is studied. It is shown that grinding at = 300 rpm

and ≥12 hours ends with amorphization and partial or complete

disproportionation of the SmCo 5 ferromagnetic phase. With a decrease in  and 

powders are multi phase: in addition to the phase with the CaCu 5 structure, the

Sm 2(Co, Zr) 7 and Sm 5(Co, Zr) 19 phases and one of the phase of disproportionation

products - ht-Co are revealed.

It is established that with increasing  and  during grinding the magnetic

anisotropy of powder particles decreases. Particles of powders obtained under the

following conditions:  = 300 rpm. and≤6 h;  = 200 rpm and ≤12 h;  = 100

rpm and  ≤24 h, are anisotropic.

The dependence of hydrogen pressure during disproportionation of

SmCo 4,8Zr 0,2 alloy on grinding conditions, taking into account the necessary
condition for obtaining anisotropic powder, is established: the pressure decreases

with decreasing powder particle size, that is, with increasing frequency and
duration of grinding. The alloy grounded at ν=100 rpm and τ = 24 hours partially

disproportionates- the condition of obtaining anisotropic materials - under a
hydrogen pressure of 0.5 MPa. If the reaction time (disproportionation) increases,

the amount of phase remains with the CaCu 5 structure decreases. After HD, p H2 =

0.5 MPa, the alloy grounded at ν = 200 rpm. and τ = 12 and 6 hours, the amount of

the initial ferromagnetic phase remains is significantly reduced (there are traces of

it). The alloy grounded at ν = 300 rpm and τ = 6 hours completely disproportionate

at p H2 = 0.1 MPa.

It is proposed to sinter powders of Sm (Co, T) 5, T = Zr, V, Ti alloys in

hydrogen by HDDR and to study conditions of the process and properties of the

obtained materials. The Sm(Co, Zr) 5 alloy are sintered at p H2 = 0.4 MPa and a

temperature of 650°C during HD; and at a temperature of 950°C during DR. It is