SU384915A1 - - Google Patents

Description

WAY OF OBTAINING DISPERSION-STRENGTHENED

one

The invention relates to the field of powder metallurgy, in particular IK, to the preparation of dispersion-bonded composite materials and can be applied in metallurgy for the production of structural materials with special properties.

A known method of producing dispersion-strengthened composite materials by introducing insoluble particles into the melt using ultrasound.

In order to increase the uniformity of the distribution of the hardening phase in the melt of the proposed method, the hardening dispersed particles are introduced into the mixing zone by injection of an inert gas and the powder of the hardening phase with simultaneous melt spraying.

The production of a composite material, for example, a nickel alloy X20H80 strengthened by dispersed ZrOz particles, according to the proposed method, is as follows.

Preheated to a temperature of about 1650 ° C, a melt of nickel alloy along a guide groove heated to SOO ° C is fed to the end of the ultrasound waveguide. At the same time, at the end of the waveguide, a powder of argon, having a temperature of about 300 ° C, is fed under pressure of 1 MPa;

MATERIALS

hardening phase ZrO2. The high amplitude of ultrasonic vibrations at the surface of the waveguide (20-25 microns) provides a suspension of the smallest redite droplets, the surface of which is enveloped by fine ZrO2 particles. Sedimentation of the walls of the heated chamber, droplets of the melt with particles embedded in them flow down

into mold and crystallized in CL1HGOK.

The amount of reinforcement phase in the volume of the matrix is governed by the ratio of the casting speed of the raloplav and the jet of argop transporting the dispersed particles to the displacement zone.

Subject and d on and e and

The method of obtaining dispersion-hardened materials, including the introduction of reinforcing dispersed particles in the melt using ultrasound, characterized in that. In order to increase the uniformity of the distribution of the hardening phase in the melt, BB - the day of hardening dispersion particles in the mixing zone is carried out by injecting the hardening phase powder with an inert gas with simultaneous melt atomization.