SU710785A1 - Method of plating the powder of ferromagnetic material - Google Patents

Description

(54) METHOD OF CLOSING POWDER OF FERROMAGNETIC MATERIAL

The invention relates to powder metallurgy and can be used in the production of ferromagnetic material powdered with metals. A method of cladding powders, including ferromagnetic materials, is known. metal in the zone of the boiling layer of the powder in which decomposition of the metal carbonyl occurs on the heated particles of the powder y. J.. A disadvantage of the known method is the low productivity of the process due to the high linear velocities of the gas flow creating the boiling layer. When this occurs, intensive cooling of suspended particles by the gas stream occurs. In addition, heating a layer of powder particles by heat transfer from a heated wall is ineffective. The purpose of the invention is to control the performance of the Popping process, the goal is achieved by the fact that the formation of a boiling layer of ferromagnetic material powder is carried out by cycling a superimposed electro-magnetic field and its heating is carried out at a high frequency. The method is carried out as follows. Fine-grained ferromagnetic material is poured into a reactor made of non-conducting material and having a cooling jacket made of HeMarsfflthoro. The reactor is a cylinder with a diameter of 100 mm and a length of 250 mm. Electromagnets with ferrite cores are located along the top cylinder generator. The form of the inductor provides a high density of magnetic power lines in the fluidized bed of granular material and iekyu - in the area of the pole tips of electromagnets. Periodically switching on and off the voltage on electromagnets with a period of 1-2 Hz, creates a uniformly boiling layer of the material to be clad. carrier gas at a rate of 10 l / min. Carbonyl vapors are scattered on the heated surface of the granular material, and not on the surface of the reactor, since the latter is cooled by flow through

Bulk weight, g / cm

.SratHsirst iiiCStaK:

The powder of ferromagnetic material is absorbed into an electromagnetic reactor in the amount of 1.5 kg. The boiling layer is cos ,. given by single-band electromotive with iron hearts. The electromagnets are powered by a direct current of 7.5 A, while the current in the connecting line is switched on and off at a frequency of 1 period of 1 second.

After loading the reactor with a fine-grained K {; ugeriam and its extraction

The magnetic field of the electromagnets turns on the INDUESHION generator and when the temperature reaches 200 ° C on the surface, carbon dioxide is fed into the reactor at a rate of 10 l / min at a concentration of 30% carbonyl nickel vapor in it.

In tab. 2 shows the particle size distribution and the weight gain of the loaded nickel powder after spraying carbonyl vapors on its surface.

Table 2 85.4 water. The intensive supply of heat to the fluidized bed upon induction heating of the ferromagnetic material allows a high concentration of carbonyl vapors in the carrier gas, reaching up to 100%, to be supplied. Example. Standard nickel powder is subjected to coating, the particle size distribution of which is microscopically listed in Table. 1, Table

Claims (1)

Claim A method of cladding a powder of a ferromagnetic material, comprising the formation of a fluidized bed of powder, a ferromagnetic powder of a ferromagnetic material, 45 characterized in that, in order to increase the productivity of the process, the formation of a fluidized bed of powder of the ferromagnetic material is carried out by cyclically applying an electromagnetic field of 50, and its heating is carried out by high-frequency currents.