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BS EN IEC 60404-8-1:2023

BS EN IEC 60404-8-1:2023

$198.66

Magnetic materials – Specifications for individual materials. Permanent magnet (magnetically hard) materials

Published By Publication Date Number of Pages
BSI 2023 54
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IEC 60404-8-1:2023 specifies minimum values for the principal magnetic properties of, and dimensional tolerances for, technically important permanent magnet (magnetically hard) materials. For information purposes only, this document provides values for the densities of the materials and the ranges of their chemical compositions. This fourth edition includes the following significant technical changes with respect to the previous edition: a) recently developed anisotropic REFeB hot deformed magnets and anisotropic HDDR REFeB bonded magnets are included; b) high energy Ca-La-Co ferrites stabilized by La and Co substitution are included; c) new and high-performance grades of REFeB and RE2Co17 sintered magnets and isotropic REFeN bonded magnets are added.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 Français
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 1 Scope
2 Normative references
3 Terms and definitions
14 4 Types of materials and their applications
5 Classification
5.1 General
Tables
Table 1 – Classification of permanent magnet (magnetically hard) materials
15 5.2 Principal magnetic properties
5.3 Additional magnetic properties
Table 2 – Magnetic properties – Symbols and units
Table 3 – Additional magnetic properties – Symbols and units
16 6 Chemical composition
7 Densities
8 Designation
9 Mode of shipment and dimensions
17 10 Testing
10.1 Extent of testing
10.2 Testing methods
11 Grounds for rejection
12 Description of tables of standard properties
12.1 Magnetically hard alloys
12.1.1 Aluminium-nickel-cobalt-iron-titanium alloys (AINiCo)
Table 4 – Chemical compositions of AlNiCo alloys (% mass fraction) – for information purposes only
18 12.1.2 Chromium-iron-cobalt alloys (CrFeCo)
Table 5 – Chemical compositions of CrFeCo alloys (% mass fraction) – for information purposes only
19 12.1.3 Iron-cobalt-vanadium-chromium alloys (FeCoVCr)
12.1.4 Rare earth-cobalt alloys (RECo)
Table 6 – Chemical compositions of FeCoVCr alloys (% mass fraction) – for information purposes only
20 12.1.5 Rare earth-iron-boron sintered and hot deformed magnets (REFeB)
Table 7 – Chemical compositions of RECo alloys (% mass fraction) – for information purposes only
21 12.2 Magnetically hard ceramics (magnetically hard ferrites)
12.2.1 Chemical composition
Table 8 – Chemical compositions of REFeB sintered and hot deformed magnets (% mass fraction) – for information purposes only
22 12.2.2 Manufacturing method
12.2.3 Sub-classification
12.2.4 Magnetic properties and densities
12.2.5 Dimensional tolerances
12.3 Bonded magnetically hard materials (Bonded magnets)
12.3.1 General
12.3.2 Magnet materials
23 12.3.3 Manufacturing method
12.3.4 Sub-classification
Table 9 – Chemical compositions of REFeN alloys for bonded magnet (% mass fraction) – for information purposes only
25 12.3.5 Magnetic properties and densities
12.3.6 Dimensional tolerances
13 Irreversible demagnetization behaviour
13.1 General
13.2 General definition of demagnetization field strength HD
26 13.3 Simplified definition of demagnetization field strength HD
Figures
Figure 1 – Graphic representation of B(H) and J(H) demagnetization and recoil curves
28 14 Tables 10 to 25
Figure 2 – Simplified evaluation of B(H) and J(H) demagnetization and recoil curves
29 Table 10 – Magnetic properties and densities of AlNiCo magnets
30 Table 11 – Magnetic properties and densities of CrFeCo and FeCoVCr magnets
31 Table 12 – Magnetic properties and densities of RECo sintered magnets
33 Table 13 – Magnetic properties and densities of REFeB sintered magnets
35 Table 14 – Magnetic properties and densities of REFeB hot deformed magnets
36 Table 15 – Magnetic properties and densities of hard ferrites
38 Table 16 – Magnetic properties and densities of isotropic AlNiCo bonded magnets
39 Table 17 – Magnetic properties and densities of isotropic and anisotropic RECo bonded magnets
40 Table 18 – Magnetic properties and densities of isotropic REFeB bonded magnets
42 Table 19 – Magnetic properties and densities of anisotropic REFeB bonded magnets
43 Table 20 – Magnetic properties and densities of isotropic and anisotropic hard ferrite bonded magnets
44 Table 21 – Magnetic properties and densities of isotropic and anisotropic REFeN bonded magnets
45 Table 22 – Dimensional tolerances (as cast or as sintered)of AlNiCo magnets
Table 23 – Dimensional tolerances of cold rolled strips of FeCoVCr and CrFeCo magnets with a maximum thickness of 6 mm and maximum width of 125 mm
46 Table 24 – Dimensional tolerances of the diameter of cold drawn wires and bars of FeCoVCr and CrFeCo magnets
47 Table 25 – Dimensional tolerances on hard ferrites
48 Annex A (informative)Physical data and mechanical reference values of AINiCo, CrFeCo, FeCoVCr, SmCo, NdFeB, hard ferrite and SmFeN bonded magnets
49 Table A.1 – Physical data and mechanical reference values of AlNiCo, CrFeCo, FeCoVCr,SmCo, NdFeB, hard ferrite and SmFeN bonded magnets
50 Annex B (informative)Grain boundary diffusion (GBD) process for REFeB sintered magnets
Figure B.1 – Example of coercivity gain of GBD processed sintered REFeB magnets in dependence of the distance to the magnet surface
51 Annex C (informative)Cerium-iron-boron sintered magnets (CeFeB)
Figure C.1 – Manufacturing flow chart of CeFeB sintered magnets
Table C.1 – Chemical compositions of CeFeB sintered magnets (% mass fraction)
52 Bibliography

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