# US 11,306,372 B2 · Cobalt-based alloy powder, cobalt-based alloy sintered body, and method for producing cobalt-based alloy sintered body > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,372 B2 - Document ID: US11306372B2 - Status: Granted - Kind: B2 - Application number: 16/640,207 - Filed: 2019-12-26 - Published: 2021-05-13 - Granted: 2022-04-19 - Earliest claimed: 2019-03-07 - Assignees: Mitsubishi Power, Ltd. - Applicants: Mitsubishi Power, Ltd. - Inventors: Yuting Wang; Shinya Imano - Web page: https://patentgrep.com/patent/US11306372B2 ## CPC - C22C 19/07: based on cobalt - B22F 1/05: Metallic powder characterised by the size or surface area of the particles - B22F 3/15: Hot isostatic pressing - C22F 1/10: of nickel or cobalt or alloys based thereon - F01D 5/28: Selecting particular materials; {Particular measures relating thereto;} Measures against erosion or corrosion - F01D 25/005: {Selecting particular materials} - B22F 5/009: {of turbine components other than turbine blades (of turbine blades B22F5/04)} - B22F 5/04: of turbine blades - B22F 9/04: starting from solid material, e.g. by crushing, grinding or milling ({C22C1/1084 takes precedence}; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C) - B22F 9/082: {atomising using a fluid (using centrifugal force B22F9/10)} - B22F 2301/15: Nickel or cobalt - B22F 2304/10: Micron size particles, i.e. above 1 micrometer up to 500 micrometer - B22F 2998/10: Processes characterised by the sequence of their steps - F05D 2230/22: by sintering - F05D 2300/175: Superalloys - Y10T 428/12014: having metal particles - C22C: ALLOYS (treatment of alloys C21D, C22F) - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00) - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A Co based alloy powder includes between 0.08% and 0.25% mass of carbon, 0.1% mass or less of boron, between 10% and 30% mass of chromium, 5% mass or less of iron, and 30% mass or less of nickel; the iron and the nickel in a total amount of 30% mass or less; includes at least one of tungsten and molybdenum in a total amount of between 5% and 12% mass; includes at least one of titanium, zirconium, niobium, tantalum, hafnium, and vanadium in a total amount of between 0.5% mass and 2% mass; includes 0.5% mass or less of silicon, 0.5% mass or less of manganese, and between 0.003% and 0.04% mass of nitrogen; and includes cobalt and impurities as the balance of the powder. Crystal grains included in the cobalt-based alloy powder have segregated cells; the cells have an average size of between 0.15 μm and 4 μm. ## Claims ### Claim 1 A cobalt-based alloy powder, comprising: 0.08 mass % or more and 0.25 mass % or less of carbon; 0.1 mass % or less of boron; 10 mass % or more and 30 mass % or less of chromium; 5 mass % or less of iron; and 30 mass % or less of nickel, comprising the iron and the nickel to be in a total amount of 30 mass % or less, comprising at least one selected from the group of tungsten and molybdenum to be in a total amount of 5 mass % or more and 12 mass % or less, comprising at least one selected from the group of titanium, zirconium, niobium, tantalum, hafnium, and vanadium to be in a total amount of 0.5 mass % or more and 2 mass % or less, comprising: 0.5 mass % or less of silicon; 0.5 mass % or less of manganese; and 0.003 mass % or more and 0.04 mass % or less of nitrogen as an essential element; and comprising cobalt and impurities as the balance of the powder, and the impurities include more than 0 mass % and 0.5 mass % or less of aluminum and 0.0005 mass % or more and 0.04 mass % or less of oxygen, crystal grains comprised in the cobalt-based alloy powder having segregated cells, and the segregated cells having an average size of 0.15 μm or more and 4 μm or less. ### Claim 2 A cobalt-based alloy powder, comprising: 0.08 mass % or more and 0.25 mass % or less of carbon; 0.1 mass % or less of boron; 10 mass % or more and 30 mass % or less of chromium; 5 mass % or less of iron; and 30 mass % or less of nickel, comprising the iron and the nickel to be in a total amount of 30 mass % or less, comprising at least one selected from the group of tungsten and molybdenum to be in a total amount of 5 mass % or more and 12 mass % or less, comprising at least one selected from the group of titanium, zirconium, niobium, tantalum, hafnium, and vanadium to be in a total amount of 0.5 mass % or more and 2 mass % or less, comprising: 0.5 mass % or less of silicon; 0.5 mass % or less of manganese; and more than 0.04 mass % and 0.1 mass % or less of nitrogen as an essential element, and comprising cobalt and impurities as the balance of the powder, and the impurities include more than 0 mass% and 0.5 mass % or less of aluminum and 0.005 mass % or more and 0.04 mass % or less of oxygen, crystal grains comprised in the cobalt-based alloy powder having segregated cells, and the segregated cells having an average size of 0.15 μm or more and 4 μm or less. ### Claim 3 A cobalt-based alloy powder, comprising: 0.08 mass % or more and 0.25 mass % or less of carbon; 0.1 mass % or less of boron; 10 mass % or more and 30 mass % or less of chromium; 5 mass % or less of iron; and 30 mass % or less of nickel, comprising the iron and the nickel to be in a total amount of 30 mass % or less, comprising at least one selected from the group of tungsten and molybdenum to be in a total amount of 5 mass % or more and 12 mass % or less, comprising at least one selected from the group of titanium, zirconium, niobium, tantalum, hafnium, and vanadium to be in a total amount of 0.5 mass % or more and 2 mass % or less, comprising: 0.5 mass % or less of silicon; 0.5 mass % or less of manganese; and more than 0.04 mass % and 0.1 mass % or less of nitrogen as an essential element, and comprising cobalt and impurities as the balance of the powder, and the impurities include more than 0 mass % and 0.5 mass % or less of aluminum and 0.005 mass % or more and 0.04 mass % or less of oxygen, the cobalt-based alloy powder having a grain size of 5 μm or more and 85 μm or less. ### Claim 4 (depends on 1) The cobalt-based alloy powder according to claim 1, having a particle size of 5 μm or more and 85 μm or less. ### Claim 5 (depends on 1) The cobalt-based alloy powder according to claim 1, having a particle size of 5 to 25 μm. ### Claim 6 (depends on 1) The cobalt-based alloy powder according to claim 1, having a particle size of 10 to 85 μm. ### Claim 7 (depends on 1) The cobalt-based alloy powder according to claim 1, wherein when the powder comprises the titanium, the titanium is in an amount of 0.01 mass % or more and 1 mass % or less, when the powder comprises the zirconium, the zirconium is in an amount of 0.05 mass % or more and 1.5 mass % or less, when the powder comprises the niobium, the niobium is in an amount of 0.02 mass % or more and 1 mass % or less, and when the powder comprises the tantalum, the tantalum is in an amount of 0.05 mass % or more and 1.5 mass % or less, when the powder comprises the hafnium, the hafnium is in an amount of 0.01 mass % or more and 0.5 mass % or less, when the powder comprises the vanadium, the vanadium is in an amount of 0.01 mass % or more and 0.5 mass % or less. ### Claim 8 (depends on 2) The cobalt-based alloy powder according to claim 2, having a particle size of 5 μm or more and 85 μm or less. ### Claim 9 (depends on 2) The cobalt-based alloy powder according to claim 2, having a particle size of 5 to 25 μm. ### Claim 10 (depends on 2) The cobalt-based alloy powder according to claim 2, having a particle size of 10 to 85 μm. ### Claim 11 (depends on 2) The cobalt-based alloy powder according to claim 2, wherein when the powder comprises the titanium, the titanium is in an amount of 0.01 mass % or more and 1 mass % or less, when the powder comprises the zirconium, the zirconium is in an amount of 0.05 mass % or more and 1.5 mass % or less, when the powder comprises the niobium, the niobium is in an amount of 0.02 mass % or more and 1 mass % or less, and when the powder comprises the tantalum, the tantalum is in an amount of 0.05 mass % or more and 1.5 mass % or less, when the powder comprises the hafnium, the hafnium is in an amount of 0.01 mass % or more and 0.5 mass % or less, when the powder comprises the vanadium, the vanadium is in an amount of 0.01 mass % or more and 0.5 mass % or less. ### Claim 12 (depends on 3) The cobalt-based alloy powder according to claim 3, having a particle size of 5 to 25 μm. ### Claim 13 (depends on 3) The cobalt-based alloy powder according to claim 3, having a particle size of 10 to 85 μm. ### Claim 14 (depends on 3) The cobalt-based alloy powder according to claim 3, wherein when the powder comprises the titanium, the titanium is in an amount of 0.01 mass % or more and 1 mass % or less, when the powder comprises the zirconium, the zirconium is in an amount of 0.05 mass % or more and 1.5 mass % or less, when the powder comprises the niobium, the niobium is in an amount of 0.02 mass % or more and 1 mass % or less, and when the powder comprises the tantalum, the tantalum is in an amount of 0.05 mass % or more and 1.5 mass % or less, when the powder comprises the hafnium, the hafnium is in an amount of 0.01 mass % or more and 0.5 mass % or less, when the powder comprises the vanadium, the vanadium is in an amount of 0.01 mass % or more and 0.5 mass % or less.