铁氧体参数及国内外牌号对照表

HARD FERRITE MAGNETS
Hard ferrite (ceramic) magnets were developed in the 1960's as a low cost alternative to metallic magnets. Even though they exhibit low energy (compared with other permanent magnet materials) and are relatively brittle and hard, ferrite magnets have won wide acceptance due to their good resistance to demagnetization, excellent corrosion resistance and low price per pound. In fact, measured by weight, ferrite represents more than 75 percent of the world magnet consumption. It is the first choice for most types of DC motors, magnetic separators, magnetic resonance imaging and automotive sensors.
Ferrite Magnets characteristics
Mostly Used national standard - SJ285-77 permanent ferrite magnet standard
Chinese SJ/T0410-2000 Permanent Ferrite Manget Standard
In MMPA（0100-87) standard
Ring shape size(mm) D×d×H
Ф115×45×5～23 Ф200×86×5～27 Ф70×32×3～17 Ф115×43×5～23 Ф200×83×5～27 Ф70×30.5×3～17 Ф115×45×5～23 Ф200×86×5～27 Ф70×32×3～17 Ф115×57×5～23 Ф200×95×5～27 Ф70×56×3～17 Ф115×58.7×3～23
Ф200×100×5～27 Ф70×40×3～17 （elliptical）
Ф115×60×5～23 Ф200×110×5～27 Ф71×40×3～17 Ф115×67×5～23 Ф200×120×5～27 Ф71×30.5×3～17 Ф115×80×5～23 Ф206×88.9×5～30 Ф71×32×3～17 Ф121×45×5～24 Ф206×89×5～30 Ф72×30.5×3～16 Ф121×57×5～24 Ф206×118×5～30 Ф72×32×3～16 Ф121×60×5～24 Ф210×86×5～30 Ф72×38×3～16 Ф121×65×5～24 Ф210×118×5～30 Ф72×40×3～16
NdFeB
Known as third generation of Rare Earth magnets, Neodymium Iron Boron (NdFeB) magnets are the most powerful and advanced commercialized permanent magnet today. Since they are made from Neodymium, one of the most plentiful rare earth elements, and inexpensive iron, NdFeB magnets offer the best value in cost and performance.
NdFeB magnets are available in both sintered and bonded forms. Sintered NdFeB offers the highest magnetic properties (28 MGOe to 50 MGOe) while Bonded NdFeB offers lower energy properties. Although bonded magnets do not possess magnetic properties as advanced as those of sintered magnets, they can be made in shapes and sizes that are difficult to achieve with sintering.
A variety of coatings can be applied to the magnets' surface to overcome the principle drawback of neodymium-based magnets, their tendency to corrode easily.
Grade Max. Energy
Product
Remanence Coercive Force Rev. Temp.
Coeff.
Curie
Temp.
Working
Temp. (BH)max B r H c H ci B d H d T c T w MGOe kJ/m3kG mT kOe kA/m kOe kA/m%/°C%/°C°C°C
N3331-33247-26311.30-11.701130-1170>10.5>836>12>955-0.12-0.6031080 N3533-36263-28711.70-12.101170-1210>10.9>868>12>955-0.12-0.6031080
1.Licensed Products by SSMC-MQ - ISO 9002 Quality Standard Certified
2.The above-mentioned data of magnetic parameters and physical properties are given at room temperature.
3.The maximum service temperature of magnet is changeable due to the ratio length and diameter and enviromental factors.
4.Special properties can be achieved with custom method.
Physical and Mechanical Properties
Max Working Temperature。