# US 2021/0277510 A1 · Method for applying a thermal barrier > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277510 A1 - Document ID: US20210277510A1 - Status: Published application - Kind: A1 - Application number: 16/811,828 - Filed: 2020-03-06 - Published: 2021-09-09 - Earliest claimed: 2020-03-06 - Assignees: Safran Aircraft Engines - Applicants: Safran Aircraft Engines - Inventors: Pascal Fabrice BILHE; Laurent Paul Dudon; Pascal Jacques Raymond Martinet - Web page: https://patentgrep.com/patent/US20210277510A1 ## CPC - C23C 4/134: Plasma spraying - B05D 3/148: {affecting the surface properties of the coating} - B28B 11/048: {by spraying or projecting} - C04B 41/0054: {Plasma-treatment, e.g. with gas-discharge plasma} - C23C 4/02: Pretreatment of the material to be coated, e.g. for coating on selected surface areas - C23C 4/11: Oxides - C23C 4/131: Wire arc spraying - C23C 4/18: After-treatment - B28B 11/0818: {for roughening, profiling, corrugating} - C23C 4/073: containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements - C23C 28/022: {with at least one MCrAlX layer} - F02C 7/24: Heat or noise insulation (air intakes having provisions for noise suppression F02C7/045; turbine exhaust heads, chambers, or the like F01D25/30; silencing nozzles of jet-propulsion plants F02K1/00) - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - B28B: SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER (foundry moulding B22C; working stone or stone-like material B28D; shaping of substances in a plastic state, in general B29C; making layered products not composed wholly of these substances B32B) - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) ## Abstract A bond sublayer is applied to a part and a ceramic layer is deposited on the bond sublayer by plasma spraying. The ceramic layer is then sintered. ## Claims ### Claim 1 A method for obtaining a thermal barrier on a part to be protected, the method comprising: forming a bond sublayer on a surface of the part to be protected by plasma spraying, the bond sublayer comprising MCrAlY, wherein M comprises Ni, Co, Fe, or NiCo; depositing a ceramic layer on the bond sublayer by thermal spraying using a plasma arc torch, the ceramic layer comprising Yttria-Stabilized Zirconia; and sintering the ceramic layer by scanning the ceramic layer with a beam of the plasma arc torch, wherein the sintering comprises heating a surface of the ceramic layer to a temperature at a point of impact of the beam on the surface of the ceramic layer between 1300° C. and 1700° C. ### Claim 2 (depends on 1) The method according to claim 1, wherein the sintering comprises heating the surface of the ceramic layer to temperature at the point of impact of the beam on the surface of the ceramic layer between 1400° C. and 1450° C. ### Claim 3 (depends on 1) The method according to claim 1, wherein, during the sintering, the temperature of the point of impact of the beam on the surface of the ceramic layer is measured and parameters of the plasma arc torch are controlled as a function of the measured temperature. ### Claim 4 (depends on 1) The method according to claim 1, wherein a spray powder used to deposit the ceramic layer is a powder of fused and crushed type having a particle size of between 10 and 60 μm. ### Claim 5 (depends on 4) The method according to claim 4, wherein the sintered ceramic layer has less than 5% porosity. ### Claim 6 (depends on 4) The method according to claim 4, wherein the sintered ceramic layer has bonding strength higher than 25 MPa with the bonding sublayer. ### Claim 7 (depends on 1) The method according to claim 1, wherein a surface of the part opposite the ceramic layer is held at a temperature lower than 950° C. during the sintering. ### Claim 8 (depends on 1) The method according to claim 1, wherein the depositing the ceramic layer on the bond sublayer by thermal spraying comprises generating transverse microcracks in the ceramic layer. ### Claim 9 (depends on 1) The method according to claim 1, wherein the sintering the ceramic layer comprises generating transverse microcracks on the ceramic layer. ### Claim 10 (depends on 1) The method according to claim 1, wherein the part is a turbine part. ### Claim 11 (depends on 1) The method according to claim 1, wherein during the sintering, the surface of the ceramic layer is scanned by the beam so as to reach a temperature of between 1300° C. and 1700° C. for five seconds to twenty seconds. ### Claim 12 (depends on 1) The method according to claim 1, wherein during the forming the bond sublayer, the depositing the ceramic layer, and the sintering the ceramic layer, the part is placed on a turntable in a spray chamber.