SU989593A1 - Ferrite material - Google Patents

Description

(B) ferrite material

The invention relates to powder metallurgy, in particular, magnetically hardened ferrite sludge materials with a round hysteresis loop, which can be used to manufacture elements of electronic equipment, in particular magnetic heads for recording and reproducing information.

A ferrite material containing oxides of iron, nickel, zinc and copper is known l.

The best P the technical essence and the achieved result to the proposed is the ferrite material С 2J, having the following composition, weight:

Copper oxide, 0-20

Nitrous oxide 0-30

Zinc Oxide 10-25

Iron Oxide Else

The value of the initial magnetic permeability, .0. ,,, is 3001600 Gs / Oe.

The disadvantage of the known material is a sharp decrease in the initial one; magnetic permeability from electromagnetic pop frequency and therefore the material is used up to 5 MHz.

The purpose of the invention is to reduce the dependence of the initial magnetic permeability on the frequency of the electromagnetic field.

ten

 For this purpose, the ferrite material contains iron oxide, nickel oxide, zinc oxide, copper oxide, which additionally contains locking copper in the following ratio of components, weight.%:

Copper oxide 0,17- Nickel oxide, 33 Zinc oxide 10.87-27.00

20 Copper Oxide 0,, 9 Iron Oxide Else Oxides or iron salts are taken to obtain the proposed material. 9 nickel, zinc and copper in the data given in Table 1 and grind in a vibrating mill with diethyl water for 2 hours. Then the mixture is heated, briquetted and baked for 2 hours at 750 ± 50 ° C. The charge is prepared by pressing powder on polyvinyl alcohol and pressing samples that are calcined at 1150–1300 ° C for 2–5 h and cooled together with the furnace turned off to 20–100 ° C. Example. 16 batches of toroidal samples (dimensions. 3 mm) of material are prepared, the final H after synthesis, the chemical composition of which is given in Table 1. The results of measurements of the initial magnetic permeability x at various frequencies f are presented in Table 2. The initial magnetic permeability was measured using an IMH-setting at room temperature. The dependence of f on f is estimated in% by the formula, 4 where yu, 5, is the initial effective magnetic permeability, respectively, at f equal to 2.5 and 15 MHz. As can be seen from Table 2, the proposed material in comparison with the known one has a significantly lower dependence of x on f, therefore it can be used with large values of the frequency of the electromagnetic field. At the same frequency values, for example, at 15 MHz, the proposed material has significantly (up to 2 or more times) higher DLc than the known one, which makes it possible to have correspondingly higher signals when playing back information. Receiving high signals at high frequency makes it possible to increase the density of recording and reproducing information using magnetic heads made of such material. Thus, the products of the proposed material have increased electromagnetic parameters that provide technical effect, in particular, when manufacturing the invention.

Ferrite material containing iron oxide, nickel oxide, zinc oxide, copper oxide, characterized in that, in order to reduce the dependence of the initial magnetic permeability on the frequency of the electromagnetic field, it additionally contains copper oxide in the following ratio of components, weight,%:

Continuation of table 2

Copper oxide

0.17-- 0.33, 2f -11.33 Nickel oxide, zinc oxide

10.87 -27.00 Copper Oxide 0.02 - 5., 90 Iron Oxide

Rest

Sources of information taken into account during the examination

1. Rabkin A.I. and others. Technologists. ferrites. M.-L. , Gosenergoizdat, 1961

s.ogog .;

f. Sitidze Yu., Sato X. Ferrites. M., Mir, 19b, p. 164.

Claims (2)

Claim Ferrite material containing iron oxide, nickel oxide, zinc oxide, copper oxide, characterized in that, in order to reduce the dependence of the initial magnetic permeability on the frequency of the electromagnetic field, it additionally contains copper oxide in the following ratio of components, weight,%: Copper oxide 0.17-0.33 Nickel oxide 4.24 -11.33 Zinc oxide 10.87 -27.00 20 Copper oxide 0.02 - 5.90 Iron oxide Rest Sources information . taken into account in the examination. 1. Rabkin A.I. et al. Technology of ferrites. M.-L., Gosenergoizdat, 1962, ² 5 ¢ .. 20 4.1 2 ~. Sitidze Yu., Sato X. Ferrites. M., World, 1964, p. 164. .