Method for testing the quality of powerful magnets

Powerful magnets have better performance and quality than ferrites. Powerful neodymium magnets can absorb 640 times more weight than their own, which is why they are awarded the title of "Magnetic King".

Don't know the quality of the powerful magnets on the market, and don't let others know that you are a layman. Is there a quality inspection method to quickly detect strong neodymium magnets?

Testing the quality of the strong NdFeB magnet is mainly evaluated from two aspects: 1. Product performance; 2. Product appearance.

1. Product performance:

The strength of neodymium magnets is a unified standard. The main indicators are remanence, coercivity and magnetic energy product grade. Strong neodymium magnets of different sizes can be distinguished by Gaussian sum, and the quality and performance of this magnet can be distinguished by Gaussian. Coercivity It can only pass the magnetic performance tester, and the general user cannot test it.

magnet
2. Product appearance:
You can pick it up to check the appearance of the product, mainly looking at the five aspects of the appearance:
(1) Pitting corrosion: including bubbles. Scars, plating tumors, slag layer and local thickness;
(2) Edge cracks: edge cracks and material residues;
(3) Scratches: knife marks, line marks, nail scratches, etc.
(4) Cracks: cracks, etc.
(5) Sand holes: pinholes, pores, particles, etc., depending on whether there are missing edges or corners around, whether the electroplating is intact, and whether the size meets the design requirements. Neodymium magnet coating prevents corrosion and rust on the surface of the magnet. The same specification is placed on a surface that can be adsorbed, which can be used to distinguish the magnitude of the magnetic force.

If you compare the user's requirements for strong magnets, you can understand the magnetic properties of the magnet under test through the demagnetization curve classification analysis.

The above is the quality inspection method of strong neodymium magnets, hope to help you how to quickly identify the quality of strong magnets.

ferrite sheet:https://www.goodsmaterial.com/