SU974421A1 - Uhf range spindle ferrite producing method - Google Patents

Description

(54) METHOD OF MANUFACTURING SPINEL FERRITES OF MICROWAVE RANGE

one

The invention relates to the manufacturing techniques of ferrite materials used in various radio engineering devices of the microwave range.

A known method for producing a term for thermofertile microwave ferrites involves the use of oxides or cobalt salts as one of the raw materials 11 3.

However, the known method does not allow to achieve a significant increase in thermal stability without degrading the basic electromagnetic parameters of ferrite products.

The closest to the invention to the technical essence and the achieved result is a method of obtaining thermostable microwave ferrites, including mixing raw materials, averaging, heat treating and grinding the ferritized mixture, and cobalt is introduced into the mixture of raw materials in the form of ferrite

Balta Next, the mixture is pressed and sintered G2,

The disadvantage of this method is that the resulting ferrite materials have a relatively high temperature coefficient of residual induction (TC 6f) and a low direct-angle network (Br / W), which reduces the performance characteristics of circulators and microwave phase shifters,

10 in which such materials are used.

The purpose of the invention is to reduce the temperature coefficient of residual induction and increase the coefficient of the direct coal type.

Claims (2)

To achieve this goal, according to the method of manufacturing spinel ferrites of the microwave range, which includes 20 mixing, averaging, heat treatment of ferrite-forming components, grinding of ferritized mixture, pressing and sintering of ferrites, at the stage of grinding, in a ferritized mixture, add a cobalt, and I’m using a cobalt, and I’ll turn on the bar to turn into a ferritic mixture. immas.% Example. The initial components, taken in the ratios indicated in the table, are mixed and averaged 4O minutes in a vibrating puller with a knit M-10 with a ratio of balls of 1:10. After that, the mixture is ferritized at -t for 5 h, and then crushed for 2 min in a vibratory screen M-10, after which the addition of cobalt ferrite () is added and the mixing is continued for 30 min. Into the obtained homogeneous mixture consisting of spinel solid solutions of ferrites, as a binder, ten percent of 1O% - пол solution of polyvinyl alcohol is pressed and the products of the required shape and size are pressed. The extruded products are sintered at 105 ° -1125 ° C in air for 5 hours, then slowly cooled. These electromagnetic characteristics of spinel ferrites of the microwave range are presented in the table. 7 .97 As can be seen from the table, the proposed method of obtaining spinel ferrites of the microwave range allows to reduce the temperature coefficient ocTaTOHiioft of magnetic induction {TC bg 0.12-0.16), while simultaneously increasing the right angle to O, 88, which exceeds (TKBh 0.25) with a square (0.8) achieved using a known method. At the same time, the other electromagnetic characteristics of ferrites obtained by the proposed method are not inferior to the known one. Formula of the invention The method of manufacturing spinel ferrites of the microwave range, including mixing, averaging, heat treating the ferrite-forming components, grinding the ferritized mixture, pressing and sintering the ferrites, in order to reduce the temperature coefficient of the residual magnetic induction and increase the rectangle. Ferritized mixture is additionally introduced with cobalt ferrite (CoFe, 0) in an amount of 0.1-1.0 wt.%. Sources of information taken into account during the examination 1. USSR author's certificate No. 756494, cl. H 01 F 1/34, 1978. 2. Japanese Patent No. 55-19043, cl. H 01 F 1/34, 1980.