Description : Plastic-bonded magnets are particle composites with permanent-magnet powder embedded in a plastic binder. Hard ferrite (HF), various SmCo and NdFeB powders and, to a very little extent, AINiCo alloys are used as magnetic powder. For embedding the magnetic particles, thermoplastic binders as, for instance, polyamide (PA) or polyphenyl sulfide (PPS) and duroplasts like epoxy resins are used. Depending on the material composition and production process, isotropic and anisotropic magnets with differing magnetic and mechanical specifications are available. Since not only the type of magnet or plastic material, but the filling and alignment degree, too, determine the composite`s properties, the outcome is widely varying magnetic parameters and an outstanding variety in types and shapes.
Injection ndfeb magnet It is a mixture of resin (pa12, pps) & the ndfeb magnetic powder, after mix together with the additive, injective produced the magnet is called injection ndfeb magnet.
Injection magnet is a mixture of magnetic powder, resin, additive, which are injective produced by a specialized injection machine. The injection magnet power is lower than sintered magnet, but it has precise sizes, light-weighted, compact and various shapes.
Magnet materials: 1)ndfeb material(sintered and bonded) 2)hard ferrite(sr ferrite and ba ferrite) 3)smco(1:5 and 2:17) 4)alnico(casting and sintering) 5)rubber magnet 6)soft magnet(mn-zn and ni-zn) 7)injection magnet(ndfeb and ferrite) Surface treatment: 1)plating (ni, zn, cr, cu, ar¦.) 2)coating(epoxy resin) 3)spray coating(epoxy resin) 1. Bonded ndfeb magnets 2. Sintered ndfeb magnets 3. Ferrites > sintered hard ferrite > soft ferrite-mnzn ferrite > soft ferrite-nizn ferrite 4 smco magnets 5 cast and sintered alnico magnets
Magnet materials: 1)ndfeb material(sintered and bonded) 2)hard ferrite(sr ferrite and ba ferrite) 3)smco(1:5 and 2:17) 4)alnico(casting and sintering) 5)rubber magnet 6)soft magnet(mn-zn and ni-zn) 7)injection magnet(ndfeb and ferrite) Surface treatment: 1)plating (ni, zn, cr, cu, a.) 2)coating(epoxy resin) 3)spray coating(epoxy resin) 1. Bonded ndfeb magnets 2. Sintered ndfeb magnets 3. Ferrites > sintered hard ferrite > soft ferrite-mnzn ferrite > soft ferrite-nizn ferrite 4.Smco magnets 5.Cast and sintered alnico magnets
Magnet Materials: 1)NdFeb material(Sintered and Bonded) 2)Hard Ferrite(Sr Ferrite and Ba Ferrite) 3)SmCo(1:5 and 2:17) 4)AlNiCo(Casting and Sintering) 5)Rubber Magnet 6)Soft Magnet(Mn-Zn and Ni-Zn) 7)Injection Magnet(NdFeB and Ferrite) Surface Treatment: 1)Plating (Ni, Zn, Cr,Cu,Ar?¦.) 2)Coating(Epoxy Resin) 3)Spray Coating(Epoxy Resin) 1. Bonded NdFeB Magnets 2. Sintered NdFeB Magnets 3. Ferrites > Sintered Hard Ferrite > Soft Ferrite-MnZn ferrite > Soft Ferrite-NiZn ferrite 4. SmCo Magnets 5. Cast and Sintered AlNiCo Magnets
Alnico magnets are manufactured by a cast or sintered process. Production level cast Alnico magnets are produced by conventional foundry methods using resin bonded sand molds. The magnetic characteristics for some exotic grades of Alnico magnets are achieved during the casting operation and are due to the unique crystalline grain orientation developed during the process. Sintered Alnico is a powdered metal and it is manufactured by compacting finely milled Alnico powder in a metallic mold. The resulting geometry is not fully dense and it must be sintered in a furnace to achieve a solid state. Properties of all anisotropic or oriented cast and sintered Alnico magnet alloys are optimized during a heat treatment process. The direction of orientation is determined in this phase of the manufacturing process which involves heating the alloy above its curie temperature, then cooling at a controlled rate in the presence of a directional magnetic field. Some cast and sintered Alnico magnets are isotropic or un-oriented and they skip the orientation process. These grades of Alnico magnets usually have lower energy products compared to the anisotropic grades, but they lend themselves to specialized magnetizing. The surfaces of cast Alnico magnets are usually dark grey, have wide tolerances, and have a rough finish. Critical dimensions are abrasively cut or ground in order to maintain close tolerances and improve the fit and finish. Sintered Alnico magnets usually require minimal grinding because they can be produced with tighter dimensional tolerances. It is usually desirable to have features developed in the casting or sintering operations because conventional machining methods are difficult to employ when fabricating Alnico magnets. According to our customer.
About NdFeB magnet: Neodymium iron boron ( NdFeB) is a type of rare earth magnetic material. NdFeB is the most advanced commercialized permanent magnet material available today. This material has similar properties as the samarium cobalt except that it is more easily oxidized and generally doesn't have the same temperature resistance. However, NdFeB magnets have the highest energy products approaching 52MGOe and are mechanically stronger than samarium cobalt magents. NdFeB material is more costly by weight than ceramic or alnico but produces the highest amount of flux per unit of volume or mass amking it very economical for many applicantions. Their high energy products lend themselves to comnpact designs that result in innovative applications and lower manufacturing costs. Unprotected NdFeB magnets are subject to corronsion. Surface treatments has ben developed that allow them to be used in most applications. These treatments include copper, silver,, gold, nickel, zinc and tin plating and epoxy resin coating. Beneficial characteristics of NdFeB magnets include their very high energy product, very high coercive force, and moderate temperature stability. Drawbacks include lower mechanical strength, and low corrosion resistance when not properly coated or plated. Magnetic Grades and Temperature: The Grade of a magent directly refers to the Maximum Energy Product of the material that composes the magnet. It in no way refers to the physical properties of the magnet. Grade is generally used to describe how "strong" a permanent magnet material is. The energy products is specified in the unites Gauss Oersted. One MGOe is 1,000,000 Gauss Obersted. A grade forty (N40) would have a Maximum Energy Product of 40 MGOe.The higher the grade the "stronger" the magnet. Magnetic materials have a wide range of working temperatures. The following chart the various materials and their maximum working temperature. NdFeB material
About NdFeB magnet: Neodymium iron boron ( NdFeB) is a type of rare earth magnetic material. NdFeB is the most advanced commercialized permanent magnet material available today. This material has similar properties as the samarium cobalt except that it is more easily oxidized and generally doesn't have the same temperature resistance. However, NdFeB magnets have the highest energy products approaching 52MGOe and are mechanically stronger than samarium cobalt magents. NdFeB material is more costly by weight than ceramic or alnico but produces the highest amount of flux per unit of volume or mass amking it very economical for many applicantions. Their high energy products lend themselves to comnpact designs that result in innovative applications and lower manufacturing costs. Unprotected NdFeB magnets are subject to corronsion. Surface treatments has ben developed that allow them to be used in most applications. These treatments include copper, silver,, gold, nickel, zinc and tin plating and epoxy resin coating. Beneficial characteristics of NdFeB magnets include their very high energy product, very high coercive force, and moderate temperature stability. Drawbacks include lower mechanical strength, and low corrosion resistance when not properly coated or plated. Magnetic Grades and Temperature: The Grade of a magent directly refers to the Maximum Energy Product of the material that composes the magnet. It in no way refers to the physical properties of the magnet. Grade is generally used to describe how "strong" a permanent magnet material is. The energy products is specified in the unites Gauss Oersted. One MGOe is 1,000,000 Gauss Obersted. A grade forty (N40) would have a Maximum Energy Product of 40 MGOe.The higher the grade the "stronger" the magnet. Magnetic materials have a wide range of working temperatures. The following chart the various materials and their maximum working temperature. NdFeB material
