Patent ID: 11919075
Assignee: SANGKYU LEE
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C  Y | IPC B

Claim 13:
14. A method for producing an oxide-dispersed strengthened alloy using organic-inorganic kneaded composition, the method comprising:
a feedstock preparing step of preparing the organic-inorganic kneaded composition prepared by kneading, pulverizing and granulating oxide-dispersion strengthening (ODS) mixed powders and a polymer binder;
a molding step of forming a semi-finished product having a predetermined shape using the organic-inorganic kneaded composition, the molding step being performed using a 3D printer and including:
a feedstock supply step of supplying the organic-inorganic kneaded composition to an extrusion head of the 3D printer;
a lamination step of laminating a printed layer on a plate by discharging the molten organic-inorganic kneaded composition to a surface of the plate through a nozzle of the extrusion head; and
a semi-finished product forming step of forming the semi-finished product by continuously laminating the printed layer in a three-dimensional shape of an object to be printed by repeatedly performing the lamination step,

a debinding step of removing the polymeric binder from the semi-finished product molded in the molding step; and
a sintering step of extracting a final product having a predetermined shape by sintering and cooling the semi-finished product in which the polymeric binder has been removed in the debinding step,
wherein the ODS mixed powders are prepared by mixing metal powders and metal oxides,
wherein the sintering step includes:
a general sintering step of performing sintering at a sintering temperature after raising the sintering temperature to a temperature range of 1250° C. to 1325° C. or less in a vacuum atmosphere; and
a hot isostatic pressure sintering step of performing sintering in a sintering temperature lower than the sintering temperature of the general sintering step in an isostatic pressure atmosphere, and

wherein the ODS mixed powders include the metal oxides which are one or more of yttria (Y2O3), thorium oxide (ThO2), lanthanum oxide (La2O3), and scandium oxide (Sc2O3).