| With the development of information technology and digitalization of electronic equipment, there are new demand to soft magnetic materials. Nanocrystalline soft magnetic alloy Fe-Cu-Nb-Si-B has been studied widely because of its high saturation induction and low coercive force. Based on a review of its current condition and development home and abroad, the thesis systematically conducts research on nanocrystalline soft magnetic alloys Fe-Co-Cu-Nb-Si-B.The preparation and magnetic properties of (Fe1-xCox)78.4Nb2.6Si9B9 Cu1(x=0, 0.15, 0.35, 0.55, 0.75)amorphous ribbons were investigated, which were prepared by melt-spinning. The results show that the optimum process parameters is that velocity of copper wheel is 35m/s, ejecting pressure is 0.14MPa, respectively. XRD analysis shows that the amorphous ribbons. Vibration sample magnetometer (VSM) was used to analyze magnetic properties of the alloys. Good magnetic properties of the alloys are obtained in (Fe1-xCox)78.4Nb2.6Si9B9Cu1(x=0,0.15,0.35, 0.55, 0.75). Saturation magnetic induction density is about 1T. Coercive force is 2～6kA/m. The domain wall pinning mechanism was used to analyze the reason for larger coercive force.The soft magnetic properties of Fe-Co-Cu-Nb-Si-B nanocrystalline alloys were studied which were annealed on the basis of DSC analysis. Changing the Co content and annealing temperature have great influence on microstructure of FeCo-based soft magnetic materials. Increasing Co content, it showed good high temperature property. When Fe:Co=85:15, the magnetic properties of nanocrystalline alloy is the best. Crystallization improved the soft magnetic properties. It attributed to the formation ofα-FeCo phase with high saturation magnetization.There will also be some Co in residual amorphous alloy, which may be increase curie temperature. And then, better high temperature soft magnetic materials will be obtained. This will be the emphasis of research.
|
PDF Full Text Request