Compression-bonded, injection-molded NdFeB magnets

Mainstream releases from China makers have zinc, nickel, epoxy resin, nickel-copper-nickel or gold coating.

The line of bonded NdFeB magnets in China targets office automation, A/V devices, computers, motors and automotive uses. The typical choices are square, cylindrical and round units, which have zinc, nickel, epoxy resin, nickel-copper-nickel or gold coating, and come in various sizes.

Products are processed using compression bonding or injection molding. Based on the former, there are BNP-6, BNP-8L, BNP-8, BNP-8SR, BNP-8H, BNP-9, BNP-11, NBP-11L and BNP-12L-grade kinds. The options in the second include BNI-3, BNI-4, BNI-5, BNI-6, BNI-6H, BNI-7 and BNI-5SR (PPS). Makers ensure releases have high remanence, coercivity and energy product.

The key materials include NdFeB powder, metal and epoxy. The local availability of the first has helped many manufacturers lower production costs by 20 to 30 percent. Large companies still rely on Magnequench for products exported to Europe, the US and Japan.

To reduce dependence on imported inputs, a few China companies are investing in magnet powder production. Galaxy Magnets set up a subsidiary in Leshan, Sichuan province in 2012, which started mass manufacture in 2014. The annual capacity is 600 tons.

Even so, material costs will continue to fluctuate in coming months and affect prices accordingly.

Here is a selection of bonded NdFeB magnets from China:

Bonded NdFeB magnet in BNP-10 grade

This model ND-R-4105520 isotropic bonded NdFeB magnet from Hangzhou Rongchang Magnet Co. Ltd comes in BNP-10 grade and has a black epoxy coating. It suits speakers, sensors, DC and linear motors, and MRI and other medical equipment.

The maker accepts a minimum order of 10 units. Delivery is within 15 days.

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Bonded NdFeB magnet suits drive generators

Ningbo Xiong Hai Magnetics Co. Ltd's model XHM13 isotropic bonded NdFeB magnet has 5,200 to 7,600G residual induction, 3.8 to 6kOe normal and 8 to 16kOe intrinsic coercivity, and 40 to 96MGOe energy product. The maximum operating temperature is 140 C.

The unit targets generators, drive generators, miniature sensors, IT equipment, meters and other instruments,and home electronics.

The minimum order quantity is 200 units. Delivery takes 15 days.

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Bonded NdFeB magnet operates in 80 C

Shenzhen City Ri Shengchang Magnet Technology Co. Ltd's model Bonded NdFeB-004 is a zinc-coated isotropic magnet with 80 C operating temperature. The unit is 150x100x250mm. It may come in custom shapes.

The minimum order is 1,000 units. Delivery takes 10 days.

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Bonded NdFeB magnet resists demagnetization

Yuxiang Magnetic Materials Industry Co. Ltd's model YX002 isotropic bonded NdFeB magnet with epoxy or nickel plating comes in various shapes and sizes. It boasts 8 to 48MGOe energy product.

The minimum order quantity is 1,000 units for delivery within 15 days.

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