GB/T 38437-2019 Methods of measurement of the magnetic dipole moment of a ferromagnetic material specimen by the withdrawal or rotation method

Scope

This standard specifies the basic method for measuring the magnetic dipole moment of ferromagnetic material samples using a detection coil under an open magnetic circuit. The measurement of magnetic dipole moment can be conducted either by a pull-out method or a rotation method. This standard is applicable to all ferromagnetic materials, particularly suitable for measuring the magnetic dipole moment of permanent magnets (hard magnets) and the specific saturated magnetic polarization intensity of hard alloy materials containing ferromagnetic binders. Additionally, by magnetizing the sample to saturation in a certain manner, the saturated magnetic dipole moment of the sample can also be determined. The average value of the sample's magnetic polarization intensity can be calculated by measuring its magnetic dipole moment and the sample's volume. The calibration of magnetic moment coil systems and the measurement of magnetic dipole moment of weakly magnetic materials can also adopt this method. Remanent magnetization, coercivity, maximum magnetic energy product, and other parameters can be measured under a closed magnetic circuit according to the methods described in GB/T 13012 and GB/T 3217. The intrinsic coercivity HcJ of soft magnetic and semi-hard magnetic materials can be measured under an open magnetic circuit according to the methods described in GB/T 13888.

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