Dissertation > Excellent graduate degree dissertation topics show

The Crystallization Kinetics and Magnetic Properties of Co-finemet Type Alloy

Author: WangZhen
Tutor: LiuJing
School: Wuhan University of Science and Technology
Course: Materials Science
Keywords: Crystallization kinetics Magnetic properties Magnetic powder core Heat treatment
CLC: TG131
Type: Master's thesis
Year: 2013
Downloads: 7
Quote: 0
Read: Download Dissertation

Abstract


In1988, Yoshizawa invented the Finemet alloy and wide spreaded for its high saturationmagnetic density and low coercivity. With the continuous development of technology, newrequirements are proposed. On the basis of previous studies, the fabrication and magneticproperties of Finemet alloy are studied.The nano-crystallization kinetics of Fe73.5-xCoxSi13.5B9Cu1Nb3（x=10，30，50） amorphousribbons were investigated. It was found that the activation energies of the first crystallizationreduce and the second crystallization rise with increasing Co content calculated by usingKissinger and Ozawa methods.The soft magnetic cores of Co10-Finemet are prepared by insulation coating and coldmolding. Investigations indicate that the optimum process parameters of nanocrystallinemagnetic powder core are listed as follows:355800μm,3%insulation,174kN pressure, andannealing under100℃for11h. The effective permeability μeis56Gs/Oe in frequency of1kHz and it’s39Gs/Oe in frequency of5MHz, the quality factor Q first increases to35at250kHz and then decreases with increasing frequency.In order to increase the high-frenquency magnetic properties, the content of alloy andannealing are studied. By compared, we can know that the increase of Co content and induce ofB content are good for the magnetic properties. After annealed in transverse magnetic field, thehysteresis loop becomes narrow and Br is significantly lower, the stability of permeability withfrequency is increased.

Related Dissertations

  1. Study on the Synthesis and Properties of Poly(1,4-Cyclohexyledimethylene Terephthalate) (PCT),TQ323.4
  2. Study on Key Technology and Its Physiological Basis of Virus Elimination and Rapid Propagation of Phalaenopsis,S682.31
  3. 1,3 - propanediamine shrink o-vanillin 3d-4f heteronuclear bimetallic complexes synthesis, structure and properties of,O627.3
  4. The Structure and Properties of Electronspun PSU Fibrous Membranes,TQ340.1
  5. Study on the Subsurface Crack of Supporting Roller Made of Austempered Ductile Iron,TG156.3
  6. Thermophysics Research on Postharvest Spherical Fruit during Heat Treatment,S66
  7. Research on the Microstructures and Properties of Semi-solid ZL201 Alloy Die Forging,TG146.21
  8. Syntheses, Structures and Magnetic Properties of New Octacyanometallate-based Coordination Polymers,O641.4
  9. The Research on Rolling and Heat Treatment Technology of AZ31 Magnesium Alloy Thin Sheet,TG166.4
  10. Controlled Synthesis、Characterization and Properties of Nanpatructured Metal Sulfides and Multimetal Phosphates,TB383.1
  11. Low-Frequency Magnetic Pulsing Effect as Well as EET Study of Amorphous Alloy Fe43Co43Hf7B6Cu1,TG139.8
  12. Effect of Heat Treatment and Alloy Composition on Microstructure and Properties of Wear-resistant Casting Steel,TG142.4
  13. Development of Cr-Mo Alloy Steels for Liner Applications and Assessment of Its Wear Resistance,TG335.5
  14. Research on Composite Hard Anodic Oxidation of Aluminum Alloys and Mechanism,TG174.44
  15. Effect of Ag and Er on Microstructures and Properties of Al-Mg-Si-Cu Alloys,TG146.21
  16. Study on the Properties of PLA Filament and Its Mixed Fabrics,TS101.923
  17. Studies on Preparations and Properties of Coordination Complexes Based on Carboxylate Linkers with Novel Aromatic/Saturated Ring Skeletons,O641.4
  18. Preparation and Luminescence Properties of Sulfophosphate Glasses,TQ171.1
  19. Solvothermal Synthesis and Properties of Three-Dimensional Ordered Nihpo3 ·H2 O/Cu3 V2O （OH）2 ·2H2O Micro/Nanomaterials,TB383.1
  20. Study on Extrusion and Heat Treatments of AJ and AE Series Cast Magnesium Alloys,TG166.4
  21. Studies on the Effects of Diacid with Long Carbon Chain on PBT’s Crystallization and Melting Behavior,TQ316.3

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Alloy theory
© 2012 www.DissertationTopic.Net  Mobile