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    Production Equipments & Technological Processes Product Photos Magnetic Characteristics & Demagnetization Curves GBD Dimension & Coating

    SINTERED SMCO

    SINTERED NDFEB

    MAGNETICS ASSEMBLIES

    Manufacturing Equipments & Process Flow of Sintered NdFeB

    Advanced manufacturing equipments, automatic inspection equipments, high-tech R&D equipments

    Compounding

    Strip Casting

    HD

    Jet Milling

    Pressing

    Sintering

    Magnetic Properties Testing

    Machining

    Inspection

    Packing

    SINTERED NDFEB
    SINTERED NDFEB MAGNETIC PROPERTIES
    DEMAGNETIZATION CURVES OF SINTERED NDFEB MAGNET
    GRAIN BOUNDARY DIFFUSION

    Grain boundary diffusion technology is to form a thin layer of Dy or Tb heavy rare earth on the surface of sintered NdFeB magnet sheet with thickness of 1-9mm by surface coating, magnetron sputtering, vacuum evaporation and electrophoretic deposition.After proper heat treatment and tempering treatment, the intrinsic coercivity of the magnet is greatly improved.It can reduce the use of heavy rare earths material, thereby reduce manufacturing costs. It can also produce high- performance magnet that can't produced by normal processes.

    工藝流程

    Manual feeding / automatic feeding

    Automatic weighing

    Workpiece heating

    Automatic spraying (A side)

    Automatic weighing

    On line automatic turning material

    Automatic heating

    Workpiece heating

    Automatic spraying (B side)

    Automatic weighing

    Unloading / automatic material receiving

    Vacuum sintering furnace

    Process flow chart Manual feeding / automatic feeding Automatic weighing Workpiece heating Automatic spraying(A side) Automatic weighing On line automatic turning material Automatic heating Workpiece heating Automatic spraying(B side) Automatic weighing Unloading / automatic material receiving Vacuum sintering furnace
    Equipment
    Illustration of grain boundary diffusion process
    The coercivity of magnet with different thickness increases after grain boundary diffusion
    Content of heavy rare earth in formula Product thickness(mm) Increase range of Hcj during grain boundary infiltration of Dy(kOe) Increase range of Hcj during grain boundary infiltration of Tb(kOe)
    0 <4 4~5 7~8
    0 4~8 3~4 6~7
    >2% <4 3~4 6~7
    >2% 4~8 2.5~3.5 5~6
    Magnet shape Maximum machining size(mm) Minimum machining size(mm)
    Block Rectangle:L200×W100×H40 L0.9×W0.3×H0.9
    Square:L200×W100×H100
    Ring D250×d150×H40 D1.5×d0.5×H0.5
    Cylinder D250×H40 D1×H0.5
    Arc segment L180×W80×H50 L3×W2×H1
    Loaf L180×W80×H50 L3×W2×H1
    Irregular L180×W80×H50 L0.9×W0.3×H0.9
    Plating material Minimum part thickness(μm)
    Ni 10
    NiCuNi
    Zn Zn 4
    CZn 6
    Ni+Sn 12
    Ni+Ag
    Epoxy 15

    Remark 1 : Typical working environment generally refers to the room environment without dew.

    Remark 2 : Minimum part thickness refers to the plating thickness in the main surface that can be contacted by the sphere of D20mm.

    Remark 3 : The standard does not specify the maximum plating thickness(It is decided after discussion between the supplier and customer.).The maximum plating thickness should not affect the tolerance of final product size.

    Remark 4: Minimum part thickness of the combined plating refers to the total thickness of the each plating layer.

    Time to start to corrode
    Plating material Time to start to corrode(h)
    Neutral SST Damp heat test PCT
    Ni(barrel plating) 36 500 36
    Ni(rack plating) 16 500 36
    NiCu+Ni(barrel plating) 36 500 36
    NiCu+Ni(rackplating) 16 500 36
    Zn Zn 24 72
    CZn or Zn 48 72
    Ni+Au 36 500 96
    Ni+Sn 72 800 96
    Epoxy 100 240

    Remark 1 : Generally plating Zn does not apply to damp heat test, PCT and thermal shock test.

    Remark 2:The result for neutral SST,damp heat test and PCT is based on general size,e.g.D10x3/D10x4,etc. When the magnet size changes, e.g. magnet weight>20g or <2g or irregular magnet including arc segment, the test result should adjust accordingly.

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