METHOD FOR PRODUCING A LAYERED METAL-POLYMERIC NANOCOMPOSITE MATERIAL BY EXPLOSIVE PRESSING Russian patent published in 2019 - IPC B22F7/02 B22F3/08 

FIELD: metallurgy.

SUBSTANCE: invention relates to the production of a layered metal polymer material in the form of a plate with a main layer of polytetrafluoroethylene (PTFE) and nickel and a layer of PTFE and copper by explosive pressing and can be used in industry in the manufacture of friction pairs. Place steel liners, having in cross section the shape of segments, a powder metal-polymer mixture and sandy layers in a cylindrical ampoule. Initiate the process of detonation in explosive charges and explosive pressing. Symmetrically to the longitudinal axis of the ampoule with an inner diameter D, a separating metal plate is installed with reduced adhesion to polymers with the formation of two cavities between a separating plate and the inner surfaces of steel liners with a thickness of (0.25–0.30) D. Each cavity is divided into two layers in thickness: a layer adjacent to the metal separating plate and a layer adjacent to the inner surface of a steel liner. Ratio of the thicknesses of these layers is 1:4. Layer of lesser thickness is placed closer to the longitudinal axis of the ampoule, after which the cavities formed in layers are filled with powder metal-polymer mixtures. For the layer adjacent to the metal separating plate, a mixture consisting of PTFE powders and copper in a ratio of 50/50 is used. For the layer adjacent to the inner surface of the steel liner, a mixture consisting of PTFE powders and nickel in a ratio of 30/70 is used. Mixture is compacted by a static pressing, providing a relative density of the layer adjacent to the metal separating plate, 0.7–0.8, and the layer adjacent to the inner surface of the steel liner, 0.5–0.6. Explosive and the thickness of the sector explosive charges are chosen from the condition of providing pressure in the layer of the powder metal-polymer mixture adjacent to the metal separating plate, 10–12 GPa, and in the layer adjacent to the inner surface of the steel liner, 8–10 GPa. Contact area of each sector explosive charge with the walls of the ampoule is about 33 %. Sintering is carried out at a temperature of 390–400 °C for 0.5 h followed by removal of the deformed ampoule, liners and metal separating plate.

EFFECT: method allows to obtain the layered metal-polymer material in the form of the plate with the main layer of PTFE and nickel and a layer of PTFE and copper.

1 cl, 2 dwg, 1 tbl, 2 ex