GB/T 3656-2022Methods of coercivity measurement of magnetic iron and magnetically soft alloy by pulling out procedure (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Results and Drafting Rules for Standardization Documents" drafting.

This document replaces GB/T 3656-2008 "Measurement method for coercive force of soft magnetic materials by flinging". Compared with GB/T 3656-2008, except Apart from structural adjustments and editorial changes, the main technical changes are as follows.

a) The term coercive force is deleted, and relevant terminology standards are directly quoted (see Chapter 3, Chapter 3 of the 2008 edition);

b) Deleted the relevant description of the magnetic flux integrator (see 5.6 of the 2008 edition);

c) Increased the provisions of the fluxmeter (see 5.7);

d) Increase the measurement principle (see Chapter 6);

e) Added the general rules for coercive force determination, added the fluxmeter method (method B) and multiple measurement fitting calculation method (method C) (see Chapter 7);

f) Changed the reproducibility of measurement results of different methods (see Chapter 8, Chapter 7 of the 2008 edition);

g) Increased the selection of measurement methods in the test report (see Chapter 9).

1 Scope

This document specifies the sample, measurement device, measurement principle, measurement procedure, measurement result reproducibility and measurement test report.

This document is applicable to the coercivity measurement of electromagnetic pure iron and soft magnetic alloy materials.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 2900.60 Electrotechnical Terminology Electromagnetics

GB/T 9637 Electrotechnical Terminology Magnetic Materials and Components

3 Terms and Definitions

The terms and definitions defined in GB/T 2900.60 and GB/T 9637 apply to this document.

4 Samples

The sample should be long and the ratio of length to width (or diameter) should not be less than 10. The recommended size of the thin plate sample is: length 200mm±0.3mm, width 20mm±0.2mm, thickness 1mm~4mm; the recommended size of rod-shaped sample is: length 200mm±0.2mm, diameter 10mm±0.2mm.

Thin specimens should be straight, uniform in cross-sectional area, and should not have obvious defects such as holes, burrs and corrosion.

5 Measuring device