I= ENHANCEMENT OF MAGNETIC PROPERTIES BY ALLOYING AND PROCESSING OF Fe-28Cr-15Co SYSTEM
Pakistan Research Repository Home
 

Title of Thesis
ENHANCEMENT OF MAGNETIC PROPERTIES BY ALLOYING AND PROCESSING OF Fe-28Cr-15Co SYSTEM

Author(s)
Zubair Ahmad
Institute/University/Department Details
Bahauddin Zakariya University
Session
2001
Subject
Materials science
Number of Pages
108
Keywords (Extracted from title, table of contents and abstract of thesis)
isotropic magnets, sintered magnets, magnetic field, anisotropic magnets, isotropic magnets

Abstract
Magnetic properties in Fe-28Cr-150Co based alloys were enhanced by addition of ferromagnetic α-phase forming elements like Mo,Ti, Al, V,Si and by optimizing the hear treatment conditions. The isotropic Fe-28Cr-15Co-3. Mo-1.8 Ti magnets have produced the highest coercivity , Hc =792Oe(63kA/m), which is superior to the reported coercivities in isotropic magnets of Fe-Cr-Co system containing 15-25wt%Co. The anisotropic Fe-28-Cr-15Co-33Mo-1.8Ti magnets have produced maximum magnetic properties as coercive force of 970Oe (77.2 kA/m), remanence of 11.2kG(1.12T) and energy product of 601 MG.Oe(48.6kJ/m3). The anisotropic Fe.28Cr-15Co-33.5Mo-1.8Ti magnets have potential to replace Co-Steel, Vicalloy, Cunico, Ferrites and Alnico 7 magnets in term of cheaper material composition, better corrosion resistance, good ductility, butter temperature stability and better magnetic properties

The process and material used to produce Fe-28-Cr-15Co based magnets are easy and economical, which can be sued for the mss production of. Fe-CR-Co magnets with high energy products Small and complex shape magnets can be made with Fe-28Cr-15-Co alloys, which are difficult to fabricate with ceramic, and powder metallurgy produced magnets

Download Full Thesis
1228.44 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
61.5 KB
2 1 Introduction 1
64.45 KB
  1.1 The Aims and objectives of the present work 5
  1.2 References 7
3 2 Literature review 8
221.15 KB
  2.1 Isotropic magnets 15
  2.2 sintered magnets 16
  2.3 Magnetic filed aged anisotropic magnets 17
  2.4 Deformation aged anisotropic magnets 21
  2.5 References 24
4 3 Experimental procedures 28
68.03 KB
  3.1 Composition of alloys 28
  3.2 Alloy preparation 29
  3.3 Chemical analysis 30
  3.4 Heat Treatment 30
  3.5 X-Ray diffraction analysis 32
  3.6 Grain size measurements 33
  3.7 Mircostructural examination 33
  3.8 Magnetic properties measurement 34
  3.9 References 34
5 4 Results and discussion 35
914.64 KB
  4.1 The Fe-30Cr-25Co and Fe-30Cr-25Co-3.5Mo-0.3Ti system alloys 35
  4.1.1 X-ray Diffraction studies 35
  4.1.2 Microstructural Examination 35
  4.1.3 Magnetic Properties 40
  4.1.4 References 44
  4.2 Isotropic Magnets 45
  4.2.1 The Fe-28Cr-15Co-xM system alloys( M=Mo,A1,Si,V,Ti: X=1,2,3,4) 45
  4.2.2 References 55
  4.3 Anisotropic magnets 56
  4.3.1 The Fe-28Cr-15Co system alloys 56
  4.3.2 References 65
  4.4 The Fe-28Cr-15Co-(1-4 )Mo system alloys 66
  4.4.1 Chemical composition analysis 66
  4.4.2 X-ray diffraction studies 66
  4.4.3 Texture studies 69
  4.4.4 Microstuctural Examination 76
  4.4.5 Magnetic properties 79
  4.4.6 References 84
  4.5 The Fe-28Cr-15Co-305MO-(1-3) Ti system alloys 85
  4.5.1 Chemical composition analysis 85
  4.5.2 X-ray diffraction studies 85
  4.5.3 Texture studies 88
  4.5.4 Microstuctural Examination 94
  4.5.5 Magnetic properties 99
  4.5.6 References 103
6 5 Conclusions 105
19.12 KB
7 6 Publications And Awards 107
19.91 KB