METHOD OF MANUFACTURING A CERAMIC HOLLOW RODS Russian patent published in 2018 - IPC B22F3/23 B22F3/14 C22C1/05 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of powder metallurgy, in particular to the production of ceramic hollow rods used as covers for thermocouple measurements in corrosive environments, jet-forming nozzles for hydroabrasive cutting of materials, nozzles for plasmatrons, as well as hollow electrodes for electric spark alloying during the application of wear-resistant coatings. Method of manufacturing the ceramic hollow rod includes the preparation of an exothermic mixture of powders of the initial components, molding from a mixture of a cylindrical billet, initiating a combustion reaction in the SVS mode, sealing during the combustion of products with a pressure of 0.01–0.5 MPa, extrusion of combustion products. Exothermic mixture is prepared containing powders of pure metals and powders of non-metal and /or metal oxides, during their chemical reaction the combustion temperature is greater than the melting point of at least one initial component. Extrusion is carried out in a quartz caliber with a diameter of 4–10 mm, while its diameter is larger than the diameter of the outflow aperture of the forming matrix by 1.5 or more times.

EFFECT: ceramic hollow rods are obtained in a single technological cycle in tens of seconds, that simplifies and increases the productivity of the rod making process.

1 cl, 2 dwg, 4 ex