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Sintered NdFeB Magnet

특징

  • 희토류 Nd, Dy 및 Fe 등을 주원료로 한 자석으로 자력이 강하여 경량화, 소형화 용이함
  • 기계적 강도가 우수하며 최대 에너지적이 높으므로 자기특성이 가장 강력함 (최대온도 약 240º℃)

용도

  • 모터(Linear, Servo, Stepping, Coreless), 각종 센서류, 스피커, LCD패널 고정, 영구자석척 등

Main Mechanical & Physical Properties of Sintered NdFeB Magnet

Main Mechanical & Physical Properties of Sintered NdFeB Magnet
  Unit Value
Recoil Permeability / 1.05
Curie Temp. ℃ 310-350
Max. Working Temp, ℃ 80-230
Rever. Temp. Coeff. of Br %/℃ -0.13 to -0.09
Rever. Temp. Coeff. of Hcj %/℃ -0.70 to -0.45
Density g/㎤ 7.4-7.6
Vickers Hardness Hv 560-600
Elasticity Modulus kN/㎟ 140-170
Flexural Strength kgf/㎟ 2500-3000
Compressive Strength kgf/㎟ 9000-10000
Coeff. of Thermal Expansion ( C┴ ) 10 /℃ -2 to 0
( C║ ) 10 /℃ 4-9
Specific Electric Resistance 10-6Ω.m 1.3-1.6
Specific Heat Capacity J/(kg.℃) 350-500
Thermal Conductivity W/(m.℃) 5-15

Comparison Table of Different Coating Types

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Comparison Table of Different Coating Types
Suggested Environment Temperature Coating Thickness Salty Spray Test Salty Spray Test Pressure Cooker Test Temperature & Humidity Test Resistance of Weak Acid & Weak Alkali Resistance of solvent Comments
Phosphorization < 80℃ < 1μm Worse Not Available 24 Hours
Very Poor		 Very poor Very poor Protection for temporary storage and short term transportation.
Blue &White Zn < 150℃ 17-15μm > 24 hours Not Available 24Hours
Very Poor		 Poor Poor Poor protective capability, only for common environment
Rainbow Zn < 150℃ 7-15μm > 48 hours Not Available 48Hours
Very Poor		 Fair Fair With good protective capability for moisture, hot and industrial environment.
Ni  < 200℃ 10-20μm > 24 hours Fair Fair Fair Good For general protection purpose and suitable for most kinds environment. 
Ni+Ni < 200℃ 15-25μm > 48 hours Good Good Fair Good Better corrosion resistance than Ni coating, suitable for dew atmosphere and long time using.
Ni+Cu+Ni < 200℃ 15-25μm > 72 hours Very
Good		 Very Good Fair Good BThe most popular coating type. Corrosion resistance is better than Ni+Ni coating.
Epoxy / Ni+Cu+Epoxy < 130℃ 15-25μm > 96 hours Not Available Good Very Good Poor Special for requirement of electric insulation& environment of strongly industrial corrosion.
Ni+Sn < 150℃ 15-25μm > 72 hours Not Available Very Good Fair Good Superior resistance to humid atmosphere even better than Ni+Cu+Ni
Spray Coated Al < 200℃ 5-10μm > 288 hours Not Available Very Good Fair Good Superior resistance to salt and humid atmosphere, suitable for coating big size &anomalous magnet
Ion Vapor Deposited Al < 400℃ 10-30μm > 288 hours Very
Good		 Very Good Fair Good Same protecting role as spray coated Al. even coating layer with excellent adhesion on magnet.
Ni+Cu+Ni plus EVERLUBE < 100℃ 15-30μm > 120 hours Better than Ni+Cu+Ni Very good About 500hours Very Good Better Than Epoxy resistance to corrosion &wearing, good chemical stability, special for engineering usage.

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