GB/T 31967.3-2025 Active National standards

GB/T 31967.3-2025 Test methods for physical property of rare earth permanent magnetic materials—Part 3:Determination of resistivity

Publish Date: 2025-06-30 Implement Date: 2026-01-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 31967.3-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Analysis methods for rare metals and their alloys

ICS Name: Other non-ferrous metals and their alloys

Publish Date: 2025-06-30

Implement Date: 2026-01-01

Pages: 16 pages

Scope

This document describes the testing methods for the electrical resistivity of rare earth permanent magnet materials, including the Kelvin method, the Van der Pauw method, and the four-probe method.
This document is applicable to the testing of the electrical resistivity of sintered neodymium iron boron permanent magnet materials and sintered samarium cobalt permanent magnet materials. The Kelvin method is suitable for testing the electrical resistivity of rare earth permanent magnet materials perpendicular to the easy magnetization direction, parallel to the easy magnetization direction, or at other angles (the angle between the direction of the test current and the easy magnetization direction). The Van der Pauw method is suitable for testing the electrical resistivity of rare earth permanent magnet materials perpendicular to the easy magnetization direction, especially for testing the electrical resistivity of flake-like grain boundary diffusion materials. The four-probe method is suitable for testing the electrical resistivity of rare earth permanent magnet materials perpendicular to the easy magnetization direction.
This document is not applicable to the testing of the electrical resistivity of bonded rare earth permanent magnet materials.