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Basic properties and microstructure of NdFeB materials
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- Time of issue:2019-06-18 17:30
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(Summary description)Sintered NdFeB is solid, with a density of 7.2-7.7g / cm3, and a melting point of about 1150 degrees Celsius (different melting points of trace elements are also different). It is a metal conductor that can be electroplated.
Basic properties and microstructure of NdFeB materials
(Summary description)Sintered NdFeB is solid, with a density of 7.2-7.7g / cm3, and a melting point of about 1150 degrees Celsius (different melting points of trace elements are also different). It is a metal conductor that can be electroplated.
- Categories:Company news
- Author:
- Origin:
- Time of issue:2019-06-18 17:30
- Views:
Information
First, metal characteristics
Sintered NdFeB is solid, with a density of 7.2-7.7g / cm3, and a melting point of about 1150 degrees Celsius (different melting points of trace elements are also different). It is a metal conductor that can be electroplated.
Second, strong permanent magnets
The theoretical magnetic energy product of sintered neodymium iron boron is 64MGOe, and the saturation magnetization is 1.6T. At present, the largest magnetic energy product in mass production at home and abroad is 52MGOe.
Third, according to the performance can be used for different temperatures
1. Sintered neodymium iron boron can be divided into N material, M material, H material, SH material, UH material, EH material, and AH material according to the different coercivity Hcj. According to a certain aspect ratio (L / D> 0.5) and environmental conditions.
N material Hcj≥12KOe The maximum operating temperature is 80 ℃
M material Hcj≥14KOe The maximum use temperature is 100 ℃
H material Hcj≥17KOe The maximum use temperature is 120 ℃
SH material Hcj≥20KOe The maximum operating temperature is 150 ℃
UH material Hcj≥25KOe The maximum operating temperature is 180 ℃
EH material Hcj≥30KOe The maximum use temperature is 200 ℃
AH material Hcj≥33KOe The maximum operating temperature is 230 ℃
2. According to different remanence Br and maximum magnetic energy product (BH) max, it can be divided into different brand series such as:
N35 N38 N42 N45 N48 N50 N52, etc.
35M 38M 40M 42M 45M 48M 50M 52M etc.
Fourth, the concept and parameters of physical quantities
1. Curie temperature (Tc)
The concept of Curie temperature: The critical temperature at which a ferromagnet changes from ferromagnetic or ferrimagnetic to paramagnetic is called the Curie temperature or Curie point Tc.
The Curie temperature point of neodymium-iron-boron is 312 degrees Celsius. Tc is an important parameter of magnetic materials. The working temperature of high Tc materials can be increased, and the temperature stability of magnetic materials can also be improved. Adding Cobalt, Samarium, Samarium, etc. can increase the Curie temperature of magnetic materials. Therefore, in products with high necking strength (H, SH, ...), materials such as Samarium to increase Tc are added.
2. The unit of magnetic flux Ф is Weber (Wb). The entire magnet is used as the measurement object, and the measuring instrument is a magnetic flux meter.
3. The surface Gaussian unit is Tesla (T) or Gauss (GS). It takes a point on the surface of the magnet as the measurement object, the measuring instrument is a Gauss meter, and the measurement place has the center Gauss, the highest surface magnetism, etc. Therefore, products with Gaussian requirements should ask the customer whether it is the center Gauss or the highest surface magnet.
4. Temperature coefficient: The characteristics of NdFeB material are that with increasing temperature, remanence, intrinsic coercivity and maximum magnetic energy product will decrease.
Residual temperature coefficient αBr is generally in the range of -0.09 ～ 0.128% / ℃
ΑHcj caused by intrinsic coercive force temperature is generally -0.45 ～ -0.8% / ℃
For example, a certain NdFeB material αBr = -0.10% / ℃ αHcj = -0.5% / ℃
Remanence at 20 ℃ is 12KGS and coercivity is 20KOe
Ask Br and Hcj at 80 ℃
Br80 ℃ = Br20 ℃ + αBr. (T80-T20). Br20 ℃ = Br20 °-(80-20) * 0.10% / ℃. Br20 ℃ = 12 (1-0.06) = 11.28KGS
Hcj80 ℃ = Hcj20 °-(80-20) .0.005 * Hcj20 ℃ = 20 (1-0.3) = 20 * 0.7 = 14KOe
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