High Working Temperature Sintered Ring Magnet

/High Working Temperature Sintered Ring Magnet
  • Sintered Ring Magnet

High Working Temperature Sintered Ring Magnet, High Maximum Operation Temperature Sintered NdFeB Magnet, N35EH Sintered Neodymium Magnet, 200 °C Neodymium Ring Magnet

Product Name: High Working Temperature Sintered Ring Magnet
Magnet ID:Ring-Ø15xØ6×3-N35EH-Ni
+ Highest Energy of All Permanent Magnets
+ Moderate Temperature Stability
+ High Coercive Strength
+ Moderate Mechanical Strength

RARE EARTH MAGNETS Sintered Ring Magnet
1.0 CHEMICAL COMPOSITION
Rare earth magnet materials currently fall into three families of materials. They are rare-earth cobalt 5, the rare earth 2 transition metal 17 group and rare earth iron alloys.
1.1 l-5 Alloys (Rare-Earth Cobalt 5): These alloys are usually binary or ternary alloys with the approximate atomic ratio of one rare earth atom to five cobaltatoms. The rare earth element is most commonly
samarium but can also be other light rare earth such as, but not limited to, praseodymium, cerium, neodymium or a combination, or a mixture known as misch metal. Heavy rare earths such as gadolinium,
dysprosium and erbium can substitute for the light rare earth elements to give the magnetic material a lower temperature coefficient of remanence. The rare earth elements typically are 34 to 39 weight percent of the alloy.
1.2 2-17 Alloys (Rare-Earth 2 Transition Element 17): These alloys are an age hardening type with a com- position ratio of 2 rare earth atoms to 13-17 atoms of transition metals. The rare earth atoms can be
any of those found in the l-5 alloys. The transition metal (TM) content is a cobalt rich combination of cobalt, iron and copper. Small amounts of zirconium, hafnium or other elements are added to enhance the heat treatment response. The rare earth content of 2-17 materials is typically 23 to 28 weight percent of the alloy.
1.3 Rare Earth Iron Alloys: These alloys have a composition of two rare earth atoms to 14 iron atoms with one boron atom. There may be a substitution of other rare earth and/or minor additions of other elements. Cobalt is substituted for the iron at 3 to 15 % to improve high temperature performance. The rare earth content of RE-Fe magnet alloys is typically 30 to 35 weight percent.

2.0 MANUFACTURING METHODS Sintered Ring Magnet
The rare earth magnet alloys are usually formed by powder metallurgical processes. The magnetic performance of all grades is optimized by applying a magnetic field during the pressing operation, thus producing a preferred direction of magnetization. Pressing and aligning techniques can substantially vary the degree of orientation and the residual induction (Br) of the finished magnet.
The direction of the magnetic field during die pressing can be either parallel or perpendicular to the pressing direction. Magnets can also be formed by isostatic pressing. After pressing, the magnets are sintered, heat treated and ground to the final dimensions. Rare earth magnets are inherently brittle and cannot be machined with con-ventional metal cutting processes such as drilling, turning or milling. The magnets can be readily ground with abrasive wheels if liberal amounts of coolant are used. The coolant serves to minimize heat cracking, chipping and also eliminates the risk of fires caused by sparks contacting the easily oxidized grinding dust.

3.0 MAGNETIC PROPERTIES Sintered Ring Magnet
The magnetic properties and chemical compositions of the commercial grades of rare earth magnet materials are given in Table IV-l. Since many combinations of elements and orientations are possible, many additional grades are available from various producers.

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Specifications

Magnet Shape: Ring
Material: neodymium-iron-boron (NdFeB), neodymium, neo
Coating: Nickel (Ni-Cu-Ni)
Magnetic Grade:         N35EH
Magnetisation Direction: Axial
Residual Magnetic Flux Density (Br): 11.7-12.2 KGs (T):  1.17-1.22 T
Energy Density (BH)max:              33-36 MGOe   263-287 KJ/m³
Coercivity Force (Hcb):              ≥10.8 KOe  ≥859 KA/m
Intrinsic Coercivity Force (Hcj):    ≥30 KOe    ≥2388 KA/m
Maximum Operation Temperature: 200 °C
Total diameter D: Ø 15 mm
Inner diameter d: Ø 6 mm
Total height H:       3 mm
Tolerance:         ±0.05 mm
Delivery time           3-14 days
Measurements

Technical Drawing