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Structural and magnetic study of active screen plasma nitrided Fe 73.5Si13.5B9Nb3Cu1and Fe77Si11B9Nb2.4Cu0.6 ribbons

Memarzadeh Lotfabad, E ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. Publisher: 2010
  3. Abstract:
  4. The comparative study of Active Screen Plasma Nitriding (ASPN) treatment of two Finemet-type alloys with the compositions of Fe73.5Si 13.5B9Nb3Cu1 and Fe 77Si11B9Nb2.4Cu0.6 was investigated in different temperatures ranging from 410°C to 56°C. Differential Scanning Calorimetry (DSC), X-Ray Diffractometery (XRD), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), electrical resistivity, microhardness measurements and magnetic characterization by a Vibrating Sample Magnetometer (VSM) were utilized to characterize the treated samples. The comparison of the DSC data for the alloys suggested that the smaller amount of Nb as a growth inhibitor shifted the crystallization temperatures towards lower temperatures. Thus, the crystalline volume fraction and grain size in each temperature for Fe77Si11B 9Nb2.4 Cu0.6 alloy increased compared to Fe73.5Si13.5B9Nb3Cu1 alloy. The size of iron nitrides on the surface of the ribbons with the lower Si content was larger. The electrical resistivity for the annealed and nitrided Fe77Si11B9Nb2.4 Cuo0.6 alloy was lower compared to the annealed and nitrided Fe73.5Si 13.5B9Nb3Cu1 alloy, due to the larger grain size and lower Si content of Fe(Si) phase in Fe77Si 11B9Nb2.4Cu0.6 alloy. The VSM results showed that the maximum saturation magnetization and coercivity at 440°C were obtained in Fe77Si11B9Nb 2.4Cu0.6 alloy after nitriding under 75% H2 and 75% N2 gas mixture, respectively
  5. Keywords:
  6. Active screen plasma nitriding ; Fe-Si-Nb-B-Cu alloys ; Active screen plasma ; Coercivities ; Comparative studies ; Crystalline volume fraction ; Crystallization temperature ; Cu alloy ; Finemet type alloys ; Grain size ; Growth inhibitor ; Iron nitrides ; Magnetic characterization ; Magnetic studies ; Microhardness measurement ; Nitrided ; SEM ; Si content ; Vibrating sample magnetometer ; XRD ; Atomic force microscopy ; Copper alloys ; Differential scanning calorimetry ; Electric conductivity ; Grain size and shape ; Iron alloys ; Nitrides ; Nitriding ; Nitrogen plasma ; Plasma applications ; Saturation magnetization ; Ultrahigh molecular weight polyethylenes ; Silicon alloys ; Alloy ; Boron ; Calorimetry ; Comparative study ; Copper ; Crystallization ; Iron ; Niobium ; Plasma ; Scanning electron microscopy ; Silicon
  7. Source: Scientia Iranica ; Volume 17, Issue 1 F , 2010 , Pages 12-22 ; 10263098 (ISSN)
  8. URL: http://archive.scientiairanica.com/PDF/Articles/00001469/madah-hosseini.pdf