Carbonyl iron silicide powder
AssigneeBASF SE
InventorsReinhold Schlegel, Gabriele Friedrich
Life of this patent
Estimating the term…
Abstract
A process for preparing carbonyl iron silicide comprises heat treatment of an iron/silicon mixture comprising a) from 20 to 99.9% by weight of finely divided carbonyl iron and b) from 0.1 to 80% by weight of finely divided silicon powder. Also provided are a carbonyl iron silicide obtainable by alloying carbonyl iron with silicon and a carbonyl iron suicide which has a higher inductance than carbonyl iron powder.
Claims18
A process for preparing carbonyl iron silicide powder, comprising the steps of
- (i) heat treatment of an iron/silicon mixture consisting of
- a) from 20 to 99.9% by weight of finely divided carbonyl iron and
- b) from 0.1 to 80% by weight of finely divided silicon powder, and, optionally,
- c) from 0.1 to 2% by weight, based on the sum of the components a), b) and c), of elemental copper and/or at least one copper compound, elemental aluminum and/or at least one aluminum compound or elemental cobalt and/or at least one cobalt compound,
- and, in addition to a), b) and c), no more than 100 ppm nickel, 150 ppm chromium, 20 ppm molybdenum, 2 ppm arsenic, 10 ppm lead, 1 ppm cadmium, 10 ppm manganese, 1 ppm mercury and 10 ppm zinc,
- (ii) mechanically comminuting the carbonyl iron silicide formed after the heat treatment.
A process for preparing carbonyl iron silicide powder consisting essentially of the steps:
- (i) heat treating an iron/silicon mixture consisting essentially of
- (a) from 20 to 99.9% by weight of finely divided carbonyl iron,
- (b) from 0.1 to 80% by weight of finely divided silicon powder and, optionally,
- c) from 0.1 to 2% by weight, based on the sum of the components a), b) and c), of elemental copper and/or at least one copper compound, elemental aluminum and/or at least one aluminum compound or elemental cobalt and/or at least one cobalt compound, and
- (ii) mechanically comminuting the carbonyl iron silicide formed by the heat treatment.
A process for preparing carbonyl iron silicide powder consisting essentially of the steps:
- (i) heat treating an iron/silicon mixture consisting essentially of
- (a) from 20 to 99.9% by weight of finely divided carbonyl iron,
- (b) from 0.1 to 80% by weight of finely divided silicon powder and, optionally,
- c) from 0.1 to 2% by weight, based on the sum of the components a), b) and c), of elemental copper and/or at least one copper compound, elemental aluminum and/or at least one aluminum compound or elemental cobalt and/or at least one cobalt compound, and
- no further components apart from a), b) and c), and
- (ii) mechanically comminuting the carbonyl iron silicide formed by the heat treatment.
Dependencies are inferred from the claim text.