Magnetic Material sintering

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Magnetic materials are the basic materials of various industries. Recently, with the rapid development of electronic product technology, as a key material with future potential, it has attracted people’s attention. In particular, soft magnetic materials with high magnetic conductivity, low magnetic retention and low loss are used to increase FLUX density generated by magnetic fields.

Common magnetic materials such as ferrite magnetic materials, neodymium iron boron (NdFeB), etc.

Ferrite is a new type of nonmetallic magnetic material developed in 1940s. It is sometimes called magnetic porcelain because its preparation and appearance are similar to ceramics. Ferrite generally refers to iron group and one or more other appropriate metal elements of the composite oxide, belongs to the semiconductor, it is used as a magnetic medium.

Magnetic material sintering ,sintering temperature of ferrite material, generally is about 1000 ~ 1400℃. The ambient atmosphere has great influence on the properties of ferrite sintering. As mentioned earlier, the solid phase chemical reaction at the time of ferrite formation cannot be carried out in the reducing atmosphere. Therefore, the sintering of ferrite material is usually carried out in an electric furnace (kiln) heated by silicon carbide rods. For some special requirement of ferrite materials, must be in special vacuum sintering furnace, such as high permeability of manganese zinc ferrite, must be sintered in vacuum furnace, yig polycrystalline ferrite must be above 1400℃ vacuum sintering furnace. Chemical and physical changes occur in the sintering process.

NdFeb magnet can be divided into bonded ndfeb and sintered NdFeb two kinds. Bond is actually injection molding, and sintering is vacuum through high temperature heating molding! NdFeb magnet is by far the most powerful permanent magnet. The material number is n35-n52. Various shapes can be processed according to specific requirements: circular, square, punching, magnetic tile, magnetic bar, convex, trapezoid, etc. Despite these advantages, the surface is easy to rust, so usually need to do some protective surface treatment: nickel plating, zinc plating, gold plating, epoxy coating and so on. Ordinary NdFeb magnets are suitable for the environment temperature is below 80 degrees, but there are several can withstand 200 degrees of high temperature. Mainly used in electronics, electrical appliances, packaging, motors, toys, leather goods, automotive machinery and so on.

The sintering process of NdFeB magnet is as follows: batching → smelting ingots/strips → milling → pressing → sintering and tempering → magnetic testing → grinding processing → pin cutting processing → electroplating → finished products. Where the ingredients are the basis, sintering and tempering are the key.

NdFeB magnet sintered billet production tool and performance testing tool: vacuum melting furnace, belt furnace, E-breaker, jet mill, press molding machine, vacuum packaging machine, isostatic press, sintering furnace, heat treatment vacuum furnace, magnetic energy tester, gauss meter.

Ndfeb magnet machining tools: centerless grinding, rolling machine, double end grinding, flat grinding, slicing machine, double side grinding, linear cutting, tianjin high speed, west lake bench drill, special-shaped grinding, etc.