The influence of annealing temperature on the magnetic coercivity of soft magnetic powder cores: Evaluation using EBSD.
Using EBSD, it becomes possible to analyze the causes of the degradation of magnetic properties in compacted soft magnetic metal powders!
The pressed powder magnetic core is a magnetic core manufactured by compressing soft magnetic powder with an insulating coating. Due to its high operating magnetic flux density and high operating frequency, its application in high-speed motors and automotive reactors is being advanced. Generally, magnetic properties are influenced by factors such as crystal grains, strain, inclusions, and precipitates. However, since the pressed powder magnetic core undergoes annealing after compression molding during manufacturing, an investigation was conducted on the relationship between the factors that change due to annealing and the coercivity. As a result, a tendency was observed where the KAM value decreased and coercivity declined with an increase in annealing temperature. [Investigation Method] (1) Soft magnetic powder: Fe-Si powder, average particle diameter D50 = 27.2 μm (2) Sample preparation method: Coating the powder with silicone resin ⇒ compression molding (3) Evaluation method: Annealing of samples (500, 700, 750°C) ⇒ coercivity measurement - DC BH analyzer EBSD analysis - Crystal orientation (IPF) - Plastic strain (KAM) - Crystal grain size measurement *For more details, please refer to the related links or feel free to contact us.
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**Results** - As the annealing temperature increases, the KAM value decreases, and there is a tendency for the coercivity to decline. - At higher annealing temperatures, an increase in the average grain size is observed, along with a tendency for coercivity to decrease. - These phenomena can be explained by the deterioration of magnetic properties being hindered by distortion and grain boundaries affecting the movement of magnetic walls. - By applying these results, it will be possible to analyze the causes of the deterioration of magnetic properties in soft magnetic metal powder compacts using EBSD. *For more details, please refer to the related links or feel free to contact us.*
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Daitō Analysis Research has been advancing the establishment of an advanced think tank based on highly reliable analysis and analytical techniques accumulated in various material fields, as well as the challenges received from a wide range of industry customers. We aim to solve our customers' various issues with the least cost and the shortest delivery time. Moving forward, we would like to support our customers' research and development using the latest equipment and advanced manpower, and assist in creating products that enrich the future.