# US 2016/0354841 A1 · Method of fabricating an article for magnetic heat exchanger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0354841 A1 - Document ID: US20160354841A1 - Status: Published application - Kind: A1 - Application number: 15/171,765 - Filed: 2016-06-02 - Published: 2016-12-08 - Earliest claimed: 2015-06-03 - Assignees: Vacuumschmelze GmbH & Co. KG - Applicants: Vacuumschmelze GmbH & Co. KG - Inventors: Hugo Abdiel VIEYRA VILLEGAS; Matthias KATTER; Barcza ALEXANDER - Web page: https://patentgrep.com/patent/US20160354841A1 ## CPC - B01J 2/16: by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain - B22F 3/1021: {Removal of binder or filler (removal of binder from ceramics C04B35/638)} - B22F 3/18: by using pressure rollers - B22F 3/20: by extruding - B22F 3/22: for producing castings from a slip - B22F 3/225: {by injection molding} - B33Y 10/00: Processes of additive manufacturing - H01F 1/015: {Metals or alloys} - B22F 2201/013: Hydrogen - B22F 2201/10: Inert gases - B22F 2201/20: Use of vacuum - B22F 2998/10: Processes characterised by the sequence of their steps - B22F 2999/00: Aspects linked to processes or compositions used in powder metallurgy - C22C 2202/02: Magnetic - Y02P 10/25: Process efficiency - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - 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 - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - C22C: ALLOYS (treatment of alloys C21D, C22F) - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A method of fabricating an article for magnetic heat exchange is provided. The method comprises mixing a binder comprising a poly (alkylene carbonate) and powder comprising a magnetocalorically active phase with a NaZn13-type crystal structure to produce a brown body or powder comprising elements in amounts suitable to produce a magnetocalorically active phase with a NaZn13-type crystal structure, removing the binder from the brown body to produce a green body, and sintering the green body to produce an article for magnetic heat exchange. ## Claims ### Claim 1 A method of fabricating an article for magnetic heat exchange, comprising: mixing a binder comprising a poly (alkylene carbonate) and powder comprising a magnetocalorically active phase with a NaZn13-type crystal structure or powder comprising elements in amounts suitable to produce a magnetocalorically active phase with a NaZn13-type crystal structure and producing a brown body; removing the binder from the brown body and producing a green body; sintering the green body, and producing an article for magnetic heat exchange. ### Claim 2 (depends on 1) The method according to claim 1, wherein the poly (alkylene carbonate) comprises a decomposition temperature of less than 300° C. ### Claim 3 (depends on 1) The method according to claim 1, wherein the polyalklylene carbonate comprises one of the group consisting of poly (ethylene carbonate), poly (propylene carbonate), poly (butylene carbonate) and poly (cyclohexene carbonate). ### Claim 4 (depends on 1) The method according to claim 1, wherein the mixture comprises 0.1 weight percent to 10 weight percent binder. ### Claim 5 (depends on 1) The method according to claim 1, wherein the removing the binder comprises heat treating the brown body at a temperature of less than 400° C. ### Claim 6 (depends on 5) The method according to claim 5, wherein the heat treating the brown body is carried out in at least one of the group consisting of a noble gas atmosphere, a hydrogen-containing atmosphere and vacuum. ### Claim 7 (depends on 1) The method according to claim 1, wherein the removing the binder is carried out for 30 min to 20 hour. ### Claim 8 (depends on 1) The method according to claim 1, wherein at least 90% by weight of the binder, preferably more than 95 weight percent, is removed. ### Claim 9 (depends on 1) The method according to claim 1, further comprising mixing a solvent with the binder and the powder. ### Claim 10 (depends on 9) The method according to claim 9, further comprising removing the solvent from the precursor article and producing the brown body. ### Claim 11 (depends on 10) The method according to claim 10, wherein the removing the solvent comprises drying the precursor article at a temperature of less than 100 C. ### Claim 12 (depends on 9) The method according to claim 9, wherein the solvent comprises one of the group consisting of 2,2,4-Trimethylpentane, isopropanol, 3 Methoxy-1-butanol, propylacetate, dimethyl carbonate and methylethylketone. ### Claim 13 (depends on 9) The method according to claim 9, wherein the binder is Polypropylene carbonate and the solvent is methylethylketone. ### Claim 14 (depends on 1) The method according to claim 1, further comprising mechanically forming the brown body. ### Claim 15 (depends on 14) The method according to claim 14, wherein the mechanically forming the brown body comprises one of the group consisting of injection molding, extrusion, foil casting, screen printing, three-dimensional screen printing and calendaring. ### Claim 16 (depends on 14) The method according to claim 14, wherein the mechanically forming the brown body comprises fluidized bed granulisation. ### Claim 17 (depends on 14) The method according to claim 14, wherein the mechanically forming the brown body comprises extruding the brown body to form a rod, singulating the rod to form a plurality of brown bodies and rounding the plurality of brown bodies. ### Claim 18 (depends on 1) The method according to claim 1, wherein the sintering the green body comprises heat treating at a temperature between 900° C. and 1200° C. ### Claim 19 (depends on 18) The method according to claim 18, wherein the sintering is carried out in a noble gas atmosphere, a hydrogen-containing atmosphere or in vacuum. ### Claim 20 (depends on 18) The method according to claim 18, wherein the sintering is carried out for a total sintering time ttot, wherein the green body is sintered in vacuum for 0.95ttot to 0.75ttot and subsequently in a noble gas or hydrogen-containing atmosphere for 0.05ttotto 0.256ttot. ### Claim 21 (depends on 1) The method according to claim 1, wherein the magnetocalorically active phase is La1-aRa(Fe1-x-yTyMx)13HzCbwherein M is Si and, optionally, Al, T is one or more of the elements from the group consisting of Mn, Co, Ni, Ti, V and Cr and R is one or more of the elements from the group consisting of Ce, Nd, Y and Pr, wherein 0≦a≦0.5, 0.05≦x≦0.2, 0.003≦y≦0.2, 0≦z≦3 and 0≦b≦1.5. ### Claim 22 (depends on 21) The method according to claim 21, wherein 1.2≦z≦3. ### Claim 23 (depends on 21) The method according to claim 21, wherein 0.005≦a≦0.5.