# US 12,002,609 B2 · Temperature-stable soft-magnetic powder > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,002,609 B2 - Document ID: US12002609B2 - Status: Granted - Kind: B2 - Application number: 17/259,368 - Filed: 2019-07-09 - Published: 2021-09-23 - Granted: 2024-06-04 - Earliest claimed: 2018-07-11 - Assignees: BASF SE - Applicants: BASF SE - Inventors: Rene Koenig; Rastko Joksimovic; Ingo Muenster; Volker Klock; Jae Hyung Hwang; Moritz Ehrenstein; Eike Hupe; Joachim Nilges; Ralf Liebscher; Christoffer Kieburg - Web page: https://patentgrep.com/patent/US12002609B2 ## CPC - H01F 1/33: mixtures of metallic and non-metallic particles; metallic particles having oxide skin - B22F 1/16: Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) - C22C 33/02: by powder metallurgy - H01F 1/147: Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)} - H01F 1/24: the particles being insulated - B22F 1/10: Metallic powder containing lubricating or binding agents; Metallic powder containing organic material - B22F 1/102: Metallic powder coated with organic material - B22F 3/02: Compacting only - B22F 3/225: {by injection molding} - B22F 5/00: Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product - 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 - H01F 1/26: by macromolecular organic substances - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - 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 - C22C: ALLOYS (treatment of alloys C21D, C22F) ## Abstract A soft-magnetic powder coated with a silicon-based coating, wherein the silicon-based coating comprises at least one fluorine containing composition of formula (I), Si1-0.75cMcO2-0.5cFd (I), wherein c is in the range of 0.01 to 0.5, d is in the range of 0.04 to 2, and M is B or Al. ## Claims ### Claim 1 A process for coating a soft-magnetic powder, the coating comprising at least one fluorine containing composition containing a composition of formula (I): 1.Si1-0.75cMcO2-0.5cFd (I) wherein c is in the range of 0.01 to 0.5, d is in the range of 0.04 to 2, and M is B or Al, wherein the soft-magnetic powder is mixed with a silicon-based solution containing at least one soluble fluorination agent, wherein the at least one soluble fluorination agent is a compound of formula (II) [Q][MF4] (II) wherein M is B or Al; and Q is a cationic group selected from H+, Na+, K+, Rb+, Cs+ or [NR14]+, wherein R1 is independently selected from the group consisting of —H, —C1-12-alkyl, —C2-12-alkenyl, and —C6-18-aryl, each of which may be substituted with at least one group represented by the formula —OR2, wherein R2 is independently selected from —H, —C1-12-alkyl, —C2-12-alkenyl, and —C1-18-aryl. ### Claim 2 (depends on 1) The process as claimed in claim 1, wherein the soft-magnetic powder is mixed with a silicon-based solution and the at least one soluble fluorination agent is added after at least partial treatment of the soft-magnetic powder with the silicon-based solution. ### Claim 3 (depends on 1) The process as claimed in claim 1, wherein the at least one soluble fluorination agent is a compound of formula (II) [Q][MF4] (II) wherein M is selected from B, and Q is cationic group selected from H+ or [NR14]+, wherein R1 is independently selected from the group consisting of —H, —C1-12-alkyl, —C2-12-alkenyl, and —C6-18-aryl, each of which may be substituted with at least one group represented by the formula —OR2, wherein R2 is independently selected from —H, —C1-12-alkyl, —C2-12-alkenyl, and —C1-18-aryl. ### Claim 4 (depends on 1) The process as claimed in claim 1, wherein the soluble fluorination agent is selected from the group consisting of HBF4, [NH4][BF4], and [(R4—OR3)x—NH3-x][BF4], wherein R3 represents a group of the formula —(CnH2n+p)—; n is an integer from 1 to 6, p is an integer selected from 0 and −2, R4 is selected from —H or —(CmH2m+q)—CH3, m is an integer from 0 to 6, q is an integer selected from 0 and −2, with the proviso that when m=0 then q=0, and x is an integer selected from 1 to 3. ### Claim 5 (depends on 1) The process as claimed in claim 1, wherein the soluble fluorination agent has a solubility in ethanol at 0° C. of at least 15 wt.-%. ### Claim 6 (depends on 1) The process as claimed in claim 1, wherein the soluble fluorination agent is added during treatment with the silicon-based solution or immediately after the treatment with the silicon-based solution. ### Claim 7 (depends on 1) The process as claimed in claim 1, wherein 0.1 to 10 mmol of fluorination agent per kg of soft-magnetic powder is added to the silicon-based solution. ### Claim 8 (depends on 1) The process as claimed in claim 1, wherein the silicon-based solution contains a silicon alkoxide, which is added in one or more steps to the reaction mixture. ### Claim 9 A soft-magnetic powder coated with a silicon-based coating, wherein the silicon-based coating comprises at least one fluorine containing composition of formula (I): Si1.075-cMcO2-0.5cFd (I) wherein c is in the range of 0.01 to 0.5, d is in the range of 0.04 to 2, the index c and the index d have the following relation: d=4c and M is B or Al, wherein the silicon-based coating comprises between greater than 5 to 45 wt.-% of the at least one fluorine containing composition of formula (I). ### Claim 10 (depends on 9) The soft-magnetic powder as claimed in claim 9, comprising at least one fluorine containing composition of formula (I), wherein M is B. ### Claim 11 (depends on 9) The soft-magnetic powder as claimed in claim 9, wherein the silicon-based coating comprises 20 to 35 wt.-%, of the at least one fluorine containing composition of formula (I). ### Claim 12 (depends on 9) The soft-magnetic powder as claimed in claim 9, wherein the fluorine component of the fluorine containing composition is embedded within a SiO2-matrix and/or bonded to a surface of a SiO2-coating. ### Claim 13 (depends on 9) The soft-magnetic powder as claimed in claim 9, wherein the silicon-based coating has an average thickness of 2 to 100 nm. ### Claim 14 (depends on 9) The soft-magnetic powder of as claimed in claim 9, wherein the soft magnetic powder comprises 0.1 to 10 wt.-% of the silicon based coating based on the total weight of the soft magnetic powder. ### Claim 15 (depends on 9) An electronic component comprising the soft-magnetic powder as claimed in claim 9.