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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

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.

工艺流程

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

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
Block	Square：L200×W100×H100	L0.9×W0.3×H0.9
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)
Plating material		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
Zn	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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