SU592524A1 - Method of obtaining cobalt-containing ferrites - Google Patents

Description

(54) METHOD FOR OBTAINING COBALTS CONTAINING

Ferrites

Cobalt salt sticks are very small in size. In a subsequent process, the cobalt salt decomposes to oxide. As a result, the final chemical composition of ferrites remains the same as when using to prepare a mixture of the initial components of an oxide or an insoluble cobalt salt by a known method, by distributing the cobalt oxide by the proposed method, a more uniform one is achieved, which ensures high electromagnetic parameters of their products. identity and temporal stability of signals.

PRI me R. The testing and testing of the proposed method was carried out on a ferrite material with a rectangular net hysteresis composition, weight. %: Fe2Oz - 92.55; LigO - 3.26; CuO -0.13; Cu2O, 0.82; CoO - 0.28; B12Oz - 2.91. Electromagnetic parameters were studied on the cores with dimensions of 0.6 x0.4 x mm from mm. In order to obtain comparable data, cores were prepared in parallel with the use of A1 of the proposed method for producing cobalt containing ferrites and known ones.

When preparing by a known method, they acted as follows.

Weights of Lselez, copper, cobalt oxides (bismuth oxide were introduced into the burned mixture) and lithium carbonate were loaded into an Attritor type mill with a ratio between material, water and balls of 1: 1: 8 and ground for 1.5 hours. The resulting mixture dried and burned in air. 800 ° C for 4 hours. Then they were pressed and specimens were sintered.

To obtain ferrites according to the proposed method, an appropriate amount of oxides of iron, copper, and lithium carbonate was also loaded into the Attritor. Cobalt was added in the form of an aqueous solution of cobalt acetic acid Co (CH2SOO) 2 and milled at the same ratio between the material, water, and balls as in the known method of preparing a mixture of the initial components for electromagnetic parameters and their dispersion.

Electromagnetic parameters

Average 1 mA

Maximum difference in / g for different cores, mA

I D /,

Dpsiorsi.;;, I cf. 1001,%

fyv-p, mV WV, mV

sobe for 30 minutes Then, through the fitting in the lid of the oil mill, her work was fed at the same speed for 10 minutes with oxalic acid H2C204, based on the molar ratio of H2C2O4: Co (CH3COO) 2 equal to 1.2: 1 and continued to grind for another 1.5 hours. As a result This reaction leads to the precipitation of cobalt by the reaction:

Co (SNSSOO) 2 + H2C2Ol

 CSCP + 2CHC (1)

The mixture was then dried and calcined, and then crushed and sintered the samples under the same conditions. During roasting, CoC204 decomposes and forms cobalt oxide, which is part of the ferrite. Since the addition of cobalt to ferrites is the tenth share of the process, gas emissions are insignificant and roasting is carried out under the same conditions as with the known method.

In the table, the arithmetic mean values of the signals of an intact "unit destroyed" are shown.

, the duration of the UV - P, the current read current, and the maximum difference of these parameters within the group of cores studied: ALl / i, AaVzr, .. The scatter (disnersion) of parameters for cores was estimated (in%) but the ratios m:

D (; T,

A. 100;

100; dyjp

/ cf

D / 5

100.

; cf

40 These parameters are listed in the table for

of the known method of obtaining cobalt ferrites and the proposed. Samples were sintered at 975 ° C for 0.5 h in a KO-14 oven.

The method of preparation of the source components

proposed

famous

640

706

continuation of the table.

Claims (2)

The table shows that the proposed method for obtaining cobalt-containing ferrites makes it possible to significantly increase the useful signal UVi, reduce the dVz interference and the magnetization reversal time 4, and also reduce the spread (dispersion) of all parameters by 5 times. All the samples studied, manufactured according to the proposed method, do not change the signals depending on the time asymmetry of the current pulses. The proposed method for producing cobalt-containing ferrites, which has the simplicity of the known method, allows, compared with it, to achieve a more uniform distribution of cobalt in the products, to significantly improve the electromagnetic parameters, their identity and temporal stability of the signals, which provides an increase in the yield of suitable products during manufacture, their stability and reliability in operation. Claims 1. A process for producing cobalt-containing iron, cobalt component comprising administering to the charge, milling, drying, calcination, molding and sintering the product, characterized in that, in order to increase uniformity in the distribution of the cobalt-cobalt ferrites, improve electromagnetic narametrov and enhance their stability, in the preparation of Schicht, the cobalt-containing component is introduced in the form of an aqueous solution of cobalt acetic acid salt, and then, during the grinding process, an aqueous solution of oxalic acid is added to the mixture islots 2. A method according to claim 1, characterized in that an aqueous solution of oxalic acid is added in an amount exceeding by 10-30% calculated from a cobalt precipitation reaction. Sources of information taken into account in the examination: 1. L. I. Rabkin, et al. “Ferrite Technologists, SEI, 1952, p. 78-80. 2. Patent of France No. 1443612, cl. C 04 B 35/26, 1966.