Magnetic performance testing standards and projects
For the detection of some special-purpose steel and metal products, the detection of their magnetic properties should be considered first. For example, various silicon steel sheets (soft magnetic materials) for electrical appliances, permanent magnets (hard magnetic materials) for electrical appliances, various machine parts (weak magnetic or non-magnetic materials) that are not affected by magnetic force, etc. When testing these metal products, it is necessary to measure their magnetic properties according to their use, to know if they meet our performance requirements, or to avoid some mechanical properties or mechanical property defects.
1. Magnetic Performance Test Standard
At present, the national and ministerial standards related to the measurement of magnetic properties include GB/T 24270-2009 "Measurement Method of Temperature Coefficient of Magnetic Properties of Permanent Magnet Materials" and GB/T 10129-2019 "Measurement of Intermediate Frequency Magnetic Properties of Electrical Steel Strips (belts)" , GB/T 3655-2008 "Epstein Square Ring Electrical Steel Strip (Strip) Magnetic Properties Measurement Method", GB/T 3658-2008 "Soft Magnetic Materials AC Magnetic Properties Measurement Method", GB/T 13012-2008 "Soft Magnetic Materials" DC Magnetic Properties Measurement Method of Magnetic Materials", GB/T 13789-2008 "Measuring Method for Magnetic Properties of Electrical Steel Plate (Strip) Monolithic Tester", GB/T 19346-2003 "Amorphous Nanocrystalline Soft Magnetic Alloy AC Magnetic Properties Measurement Method" "Wait.
2. Key Test Items Of Magnetic Properties
In the magnetic performance test items of various magnetic materials, the focus of the test items of different materials is different. Below, we will introduce the key test items for soft magnetic materials, hard magnetic or permanent magnetic materials, weak magnetic or non-magnetic materials.
1. Important magnetic performance test items for soft magnetic materials (electrical silicon steel sheets, electrical pure iron, etc.). ) mainly includes magnetization curve, hysteresis loop, magnetic permeability, residual magnetic induction, magnetic induction under a certain magnetic field strength and core loss (hysteresis loss, eddy current loss and residual loss, etc.). )Under certain conditions;
The soft magnetic material DC measurement system automatically measures the basic magnetization curve and hysteresis loop of soft magnetic materials under static (DC) conditions, and accurately measures the initial magnetic permeability i, the maximum magnetic permeability in microns, the saturation magnetic induction intensity Bs, and the remanence Br , coercive force Hc and hysteresis loss Pu and other static magnetic characteristic parameters.
The soft magnetic AC measuring device can be used to accurately measure closed-circuit samples of soft magnetic materials such as soft ferrite, permalloy, amorphous and nanocrystalline. The product meets the requirements of GB/T3658-2008, GB/T19346-2003, SJ20966-2006 and IEC 60404-6. Automatic measurement of AC hysteresis loops, magnetization curves and loss curves for soft magnetic materials under dynamic (AC) conditions. Accurately measure dynamic magnetic characteristic parameters, such as remanence Br, coercive force Hc, specific total loss Ps, amplitude permeability a, loss angle, resistance permeability r, inductance permeability l, elastic permeability ', viscosity Permeability', inductance AL and q value. 2. The main performance test items of hard magnetic or permanent magnetic materials include residual magnetic induction intensity, coercive force and maximum magnetic energy product after magnetization under a certain magnetic field intensity;
The invention is suitable for measuring magnetic performance parameters such as remanence Br, coercive force Hcb, intrinsic coercive force Hcj, maximum magnetic energy product BHmax of various permanent magnet materials such as ferrite, AlNiCo, NdFeB, SmCo, etc. , and show the BJ-hydrogen hysteresis loop and demagnetization curve.
3. The main performance test items of weak magnetic or non-magnetic materials (including diamagnetic materials and paramagnetic materials) are the magnetic permeability or magnetic susceptibility index.
