Chapter 1 Introduction .....................................................................................1
1.1 History and development of bulk amorphous alloy................................................1
1.2 Properties and applications of bulk amorphous alloy ............................................4
1.3 Formation mechanism of bulk amorphous alloy.....................................................9
1.3.1 Structural factors of large amorphous alloy formation.........................................10
1.3.2 Thermodynamic factors for the formation of large amorphous alloys.................12
1.3.3 Kinetic factors of large amorphous alloy formation.............................................14
1.4 Evaluation parameters of amorphous formation ability..........................................15
1.4.1Approximate glass transition temperature Trg......................................................15
1.4.2 Supercooled liquid phase region ∆Tx...............................................................................16
1.4.3 γ Parameters .........................................................................................................17
1.5 Preparation and post-treatment of amorphous wire................................................19
1.5.1 Preparation method of amorphous alloy wire.......................................................19
1.5.2 Treatment method of amorphous alloy crystallization.........................................25
1.5.3 Giant magnetic impedance efect..........................................................................31
1.6 Iron-based soft magnetic amorphous alloys............................................................38
1.6.1 Development and research status of FeCo based soft magnetic alloy..................38
1.6.2 Research status of Co-based amorphous alloy.....................................................43
1.6.3 Low temperature electrical transport properties of amorphous metals.................44
1.7 Mechanism and research status of absorbing materials..........................................52
1.7.1 The birth and development of absorbing materials...............................................52
1.7.2 Classifcation of absorbing materials....................................................................54
1.7.3 Loss mechanism of absorbing materials...............................................................56
1.7.4 The principle of absorbing waves by absorbing materials....................................59
1.7.5 Research status of absorptive materials................................................................62
Chapter 2 Study on the formation ability andmagneticpropertiesofcobalt-based
alloy amorphous materials...................................................................................65
2.1 Influence of element adjustment on the formation ability of cobalt-based alloy
amorphous.....................................................................................................................65
2.1.1 Introduction...........................................................................................................65
2.1.2 Experimental method............................................................................................66
2.1.3 Theoretical basis of element selection..................................................................67
2.1.4 Infuence of B and Si element adjustment on the formation ability of CoFeBSiNb
alloy system amorphous.................................................................................................71
2.1.5 Infuence of Nb element adjustment on the formation ability of CoFeBSiNb alloy
system amorphous..........................................................................................................79
2.1.7 Summary of this chapter.......................................................................................87
2.2Analysis of cobalt-based alloy amorphous formation ability..................................89
2.2.1 Introduction...........................................................................................................89
2.2.2Analysis of free energy state of Co-Fe-B-Si-Nb alloy system amorphous...........89
2.2.3Analysis of non-crystalline crystallization process of Co-Fe-B-Si-Nb alloy system
.......................................................................................................................................94
2.2.4 Critical cooling rate of Co-Fe-B-Si-Nb alloy system ........................................108
2.2.5 Summary of this chapter.....................................................................................115
2.3 Study on magnetic properties of cobalt-based bulk amorphous alloys.................116
2.3.1 Introduction.........................................................................................................116
2.3.2 Experimental method..........................................................................................118
2.3.3 Infuence of element adjustment on magnetic properties of Co-Fe-B-Si-Nb alloy
system..........................................................................................................................119
2.3.4 CoFeBSiNb Study on giant magnetic resistance efect of amorphous alloy......125
2.3.5 Summary of this chapter.....................................................................................137
2.4 Infuence of Mo element addition on the formation ability and properties of CoFeB-
SiNb alloy system amorphous.....................................................................................139
2.4.1 Introduction.........................................................................................................139
2.4.2 Infuence of Mo element addition on the thermodynamic properties of CoFeBSiNb
alloy system.................................................................................................................139
2.4.3Analysis of the formation ability of amorphous alloy system ...........................141
2.4.4Analysis of magnetic and mechanical properties of CoFeBSiNbMo alloy system
.....................................................................................................................................147
2.4.5 Summary of this chapter.....................................................................................155
Chapter 3. Study on low temperature glass wrapping amorphous wire....159
3.1 Study on the preparation process of low temperature glass wrapped amorphous
alloy wire.....................................................................................................................159
3.1.1 Development history of glass wrapped amorphous wire....................................160
3.1.2 Preparation principle of low temperature glass wrapped amorphous wire.........165
3.1.3 Low temperature glass wrapping amorphous wire preparation device..............169
3.1.4 Preparation process of low temperature glass wrapped amorphous wire...........175
3.1.5 Key problems in the preparation of low temperature glass wrapped amorphous wire
.....................................................................................................................................180
3.1.6 Advantages of low temperature glass wrapping amorphous wire preparation
technology....................................................................................................................186
3.2 Study on GMI efect of low temperature glass wrapped FeCo base alloy fne wire
.....................................................................................................................................189
3.2.1 Study on the GMI efect of low temperature glass wrapped FeCo base alloy wire
.....................................................................................................................................191
3.2.2 Study on GMI efect of current annealing low temperature glass wrapped FeCo
base alloy flaments......................................................................................................195
3.2.3 Summary of this chapter.....................................................................................198
3.3 SEM morphology analysis of cross-section of low temperature glass wrapped FeCo
base alloy wire.............................................................................................................202
3.3.1 SEM morphology analysis of the cross-section of low temperature glass wrapped FeCo
base alloy wire after temperature annealing..................................................................203
3.3.2 SEM morphology analysis of current annealed low temperature.......................206
3.3.3 Summary of this chapter.....................................................................................208
3.4 Study on “spike” giant magnetic impedance efect...............................................210
3.4.1 TGMI efect and its characterization..................................................................211
3.4.2 Infuence of annealing temperature on TGMI efect...........................................212
3.4.3 Infuence of current density on TGMI efect......................................................214
3.4.4 Influence of drive current frequency on TGMI effect of temperature annealed
samples.........................................................................................................................215
3.4.5 Infuence of drive current frequency on TGMI efect of current annealed samples
....................................................................................................................................217
3.4.6 Summary of this chapter.....................................................................................219
3.5 Study on the low temperature resistance characteristics of FeCo base alloy fine wire
wrapped in low temperature glass.................................................................................230
3.5.1 Theory of electrical transport in amorphous alloys............................................231
3.5.2 Infuence of heat treatment on the low temperature resistance of low temperature glass
wrapped FeCo base alloy wire.......................................................................................233
3.5.3 Fitting of resistance temperature relationship curve...........................................239
3.5.4 Summary of this chapter.....................................................................................244
Chapter 4 Research on amorphous absorbing materials............................249
4.1 Preparation of amorphous magnetic materials......................................................249
4.1.1 Preparation of amorphous thin band...................................................................249
4.1.2 Preparation of amorphous powder......................................................................252
4.2 Study on the absorbing properties of CoFeBSiNb amorphous powder................253
4.2.1 Sample preparation and analysis.........................................................................253
4.2.2 Infuence of the mass fraction of absorber on absorption performance..............258
4.2.3 Infuence of pH value on absorption performance ...........................................266
4.2.4 Infuence of corrosion time on absorption performance.....................................271
4.2.5 Infuence of graphene composites on absorptive performance...........................275
4.2.6 Summary.............................................................................................................283
4.3 FeSiBPC study on the absorptive properties of amorphous powder.....................286
4.3.1 Sample preparation and analysis.........................................................................286
4.3.2 Infuence of the mass fraction of absorber on absorption performance..............290
4.3.3 Infuence of pH value on absorption performance..............................................294
4.3.4 Infuence of corrosion time on absorptive performance.....................................301
4.3.5 Summary.............................................................................................................313
4.4 Study on the absorptive properties of FeCoB amorphous powder........................317
4.4.1 Sample preparation and analysis.........................................................................317
4.4.2 Infuence of the mass fraction of absorber on absorption performance..............320
4.4.3 Summary.............................................................................................................336
References.........................................................................................................341
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