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Neodymium Magnet Manufacturer | Tengye Magnetic

Hangzhou Tengye Magnetic Materials Co., Ltd. is a neodymium magnet supplier in China. We are both manufacturer and exporter. Tengye Magnetic manufactures a variety of sintered neodymium magnets according to different shapes.

Sintered neodymium magnets are manufactured by powder metallurgy. They are manufactured by the raw materials such as iron, rare earth alloy, etc. being melted in a strip casting furnace, cast by a roller and rapidly cooled to form NdFeB ingots. These NdFeB ingots are pulverized by hydrogen and jet milled under the protection of nitrogen; the NdFeB powder is then sintered into dense blocks. The blocks are then heat-treated, ,machined to shape, surface coated and magnetized. 

Different shapes | Neodymium Magnet Manufacturer

After heat treatment, neodymium magnets are ready for machining. The machining process includes cutting, slicing, grinding, chamfering, etc. Depending on customer requirements, NdFeB blocks are machined into different sizes and shapes.

Different coatings | Neodymium Magnet Manufacturer

The material composition of neodymium magnets is iron (Fe), which oxidizes easily in the air. Therefore, it is necessary to apply a coating on neodymium magnets because they are prone to corrosion. Two main coating types are metallic coating and organic coating.

Coating type

Description

Characteristic

Color

Thickness

NiCuNi

Nickel-Copper-Nickel

great corrosion resistance

Silver

10-20 µm

Zn

Zinc

Good corrosion resistance

White-blue

8-10 µm

Epoxy

NiCu-Epoxy

Great corrosion resistance;

Organic/plastic coating

black

15-25 µm

Epoxy

Epoxy

Great corrosion resistance;

Organic/plastic coating

black

10-20 µm

Passivation

Also phosphate

Temporary protection

dark

1-2 µm

Gold

NiCuNi-Au

Great corrosion resistance; Skin Friendly

Gold

10-20 µm

Silver

NiCuNi-Ag

Great corrosion resistance; Skin Friendly

Gold

10-20 µm

Tin

Ni+Sn

Good corrosion resistance; Good for welding

Silver

10-20 µm

PTFE

Teflon® coating

Great corrosion resistance

Black

250-500 µm

NiCuNi coating
Zinc coating
Epoxy coating
Gold plating
passivation treatment
Tin(Sn) plating

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Jonah Jin

Jonah Jin
Managing Director

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