Temperature-stable soft-magnetic powder
AssigneeBASF SE
InventorsRene Koenig, Rastko Joksimovic, Ingo Muenster, Volker Klock, Jae Hyung Hwang, Moritz Ehrenstein, Eike Hupe, Joachim Nilges, Ralf Liebscher, Christoffer Kieburg
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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.
Claims15
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.
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).
Dependencies are inferred from the claim text.