Hard Ferrite Magnets

Hard Ferrite Magnets, Hard Ferrite Permanent Magnets, Sintered Ceramic Magnet, Hard Ferrite Custom Magnets China Supplier

Hard ferrite magnets, made by molding powder mixture of about 80% Fe2O3 and about 20% either BaCo3 or SrO3, is also called ceramic magnet. Along with deepening of research, some additives such as cobalt (Co) and lanthanum (La) are mixed together to improve the magnetic performance. The molded powder metallic green is sintered inside a temperature controlled furnace what is heated with electricity or coal. Though hard ferrite magnet is with low magnetic property, it is still a preferable choice to engineer in their design due to several factors: abundantly available raw material,the cheapest cost among permanent magnet family, low density, excellent stability of chemistry, high maximum working temperature and Curie temperature.

Gathering around our company, there are more than 60 companies have been producing hard ferrite magnet in the same city since year 1983. In the past years they have been aggressively developing new magnet to meet demand of market, continuously innovating technique to enhance efficiency and save cost, strictly execute ISO9001, ISO/TS16949 and 6sigm to improve quality, firmly adhere environmental system ISO14000 for promise of green production. The growth of these companies offers extensive and competitive sources for supplying hard ferrite magnet to our global customer.

Ring type hard ferrite magnet for acoustic application is the primarily marketed product and acts as an important business pillar to our company at the beginning phase. With realization of ?increasing demand for electric motion application, we have been concentrating our works on promotion of arc segment type hard ferrite magnet and have accumulated rich experience on properly producing magnet to minimize noise, maximize performance and optimize other intention of application. Also we have achieved success of developing hard ferrite magnet with irregular structure ( super-small, super-big, super-thin ), complicated geometry and super precision made by wet molding process. Limited by processing difficulty, such kinds of magnet were usually made by dry process and bonded process with shortage of low property and or expensive cost. Now our marketed hard ferrite magnet are extensively assembled inside motor, generator, sensor, loudspeaker, meter, relay, separator and many other applications for defense, automotive, robot, household electric appliance, wireless communication base station and mineral plant …

ferrite magnets ceramic magnets

hard ferrite magnets / ceramic magnets

Strontium Hard Ferrite Magnet & Barium Hard Ferrite Magnet

The formula BaO-6Fe2O3 and SrO-6Fe2O3 describes the chemical composition of barium hard ferrite magnet and strontium hard ferrite magnet. Comparing barium hard ferrite magnet, strontium hard ferrite magnet is with better magnetic performance and higher coercive force. Due to cheaper material cost, barium hard ferrite magnet is still extensively used. Sometimes, mixture of strontium carbonate and barium carbonate are used to manufacture hard ferrite for achieving high magnetic property and cost save. In foodstuff industry, directly contact with barium ferrite magnet should be prevented for safety reason.

Wet Anisotropic, Dry Isotropic & Dry Anisotropic hard ferrite magnet

The molding of hard ferrite magnet is mostly by a press machine equipped with coil what can generate an external magnetic field for getting anisotropic magnet. The material for making anisotropic hard ferrite magnet is usually at wet slurry status so that molecules can be perfectly aligned in molding process. So we call magnets made by such kind process as wet anisotropic hard ferrite magnets what only can be magnetized along pre-orientation. The (BH)max of anisotropic hard ferrite is several times stronger than of isotropic hard ferrite magnet.

The raw material for making isotropic hard ferrite magnets is generally at dry powder status. The molding is by a punch machine what could not apply an external magnetic field on magnet. Thus the subsequently attained magnets are called dry isotropic hard ferrite magnets. Magnetization on isotropic hard ferrite magnet could be done with any preferred orientation and pattern depending on magnetizing yoke.

There is also one type hard ferrite magnet called dry anisotropic hard ferrite magnet. It is made of dry material powder but being oriented by an external magnetic field. The magnetic property of dry anisotropic hard ferrite magnet is lower than wet anisotropic one. Usually the dry and anisotropic process is used to mold magnet with complex structure but higher property than isotropic one.

Ceramic Magnet Shape and Dimensional Tolerance

Hard ferrite magnet can be economically molded with ring, arc segment, rectangular, disc, cylinder, trapezium or 2 combined geometries in one piece. Depending on these basic geometries, sphere, olivary shape, and other irregular geometry are available by further machining process. Slotting in hard ferrite magnet is practicable by pre-design in tooling or diamond grinding process. Hard ferrite magnets with 3S (super-small, super-big and super-thin) structure are also producible by wet molding process.

The dimensional deviation of hard ferrite magnet is controlled within +/-2% before being machined, and could be controlled within +/-0.10mm after being simply ground by diamond tool. Customs tolerance or precise control even +/-0.015mm is achievable, but should be negotiated. In most circumstance, wet anisotropic hard ferrite magnet is supplied with surfaces which parallel to anisotropic orientation un-ground and other surfaces ground. Definitions on tolerance of concentricity, roundness, squareness, perpendicularity and others please refer to MMPA standard No. 0100-00 or DIN17410 or ISO2768.

hard-ferrite-magnets

Tooling of Hard Ferrite Magnet

The economic process for manufacturing hard ferrite magnet at big quantity is by molding with tooling. The tooling for making anisotropic hard ferrite magnet is considerably expensive, but for making isotropic hard ferrite magnet it is cheap. If the required magnet is with same diameter, or same length and width when it is block type, as the current tooling, then we can utilize the ready tooling to mold different thickness/height magnets within permissible range.

In practice, sometimes we slice big block, grind bigger diameter ring/disc and machine arc segment type of close dimension into the required one. This process is helpful to get precise dimension, to save tooling cost when the order quantity is not so big (particularly at prototype phase), and to homogenize weight and flux of each piece product. The shortage of making magnet by machine is very expensive cost.

Anisotropic, Diametrically Oriented Hard Ferrite Magnet

Ring type anisotropic hard ferrite magnets are mostly used with axial magnetization (parallel to pressing orientation). In the market there are some demands for ring type anisotropic hard ferrite magnet with diametrical magnetization (perpendicular orientation to pressing axis) what is comparatively difficult to be manufactured. This kind of magnet is designed for time-rotors, sensors, stepping motor and pump motor of house hold appliance e.g. washing machines, dishwasher, aquarium and heat-supply system etc. The manufacturing difficulty is the conflict between increasing magnetic force and decreasing product crack ratio. Magnet crack will frequently happen at processes of sintering and injection with shaft. Our engineer successfully broke the bottleneck and got some unique expertise on manufacturing this type magnet after more than 10years research.

Thermal Properties

The temperature coefficient of remanence of hard ferrite is negative. In contrast with rare earth magnet, the temperature coefficient of intrinsic coercive force of hard ferrite magnet is positive. Increasing temperature will lower remanence of hard ferrite magnet by 0.18%/℃, meanwhile intrinsic coercive force will be increased by about 0.30%/℃. Decreasing environmental temperature will lower the coercive force of hard ferrite magnet. Therefore it is suggested to have components with hard ferrite magnet not working at low temperature condition. The curie temperature of hard ferrite magnet is about 450℃. The recommended working temperature range of hard ferrite magnet is -40℃—250℃. Grain structure change will happen on hard ferrite magnet when the environmental temperature is up to about 800oC. At this temperature, the magnet could not restore original magnet force even by re-magnetization.

Chemical Stability and Coating

In most circumstance, hard ferrite magnet is with excellent stability of chemistry. It is resistant against many chemicals such as alkaline solutions, diluted acids, organic solvents, potassium and sodium hydroxides and brines etc. It can be etched by concentrated organic and inorganic acids such as sulphuric, hydrochloric, phosphoric, hydroflouric and oxalic acids. The etching degree and speed are determined by concentration, temperature and contacting duration. There is no corrosion will happen even it works at damp and hot environment, so it does not need to be coated for protection. For purpose of beauty decoration or surface cleanliness, it could be painted or plated with nickel and gold etc.

 
 
 
 
Ferrite Disc Ferrite Block / Rectangular Ferrite Ring Ferrite Rod / Cylindrical
Disc ferrite magnets, also called ceramic disc magnets, come in a variety of sizes Ceramic blocks are offered in a wide range of sizes, dimensions and different proportions or scales Ferrite rings are similar to ferrite disc magnets but with a hole in the middle, which makes them a versatile magnet option. Cylindrical Ferrite Magnets are widely used in speakers for home and car audio systems as they suppress high frequency noise in electronic circuits.
 
 
 
Ferrite Segment / Arc Ferrite Horseshoe / U-shaped Ferrite Irregular-shaped  Holding Ferrite Pots
Segment Ferrite magnets, also called ceramic segment/arc magnets, are widely used in motors and rotors. Horseshoe Ferrite Magnets also called ceramic horseshoe magnets or U-shape ferrite magnets, are widely used in teaching and playing. Our customer shaped ferrite magnets are a low cost but versatile and multipurpose type of magnet.  Ferrite Pot Magnets are useful for corrosion resistance, marine, low cost and higher temperature applications.
Variants are available with ferrite magnetic core, with threaded socket, countersunk or cylinder bore or external thread.
Speed ​​Motor Magnetic Ring 16-poles Ferrite Radial Magnetization

Speed ​​Motor Magnetic Ring 16-poles Ferrite Radial Magnetization

Speed ​​Motor Magnetic Ring 16-poles Ferrite Radial Magnetization, 16-poles Magnetization Hard Ferrite Ring Multi-pole Magnets, motor rotor permanent magnets, Radially Orientation Multi-pole Ceramic Magnetic Ring, Anisotropic multi-polar magnetic rings in air-conditioning motor rotors and DC brushless motors Speed ​​Motor Magnetic Ring 16-poles Ferrite Radial Magnetization Features: Specification size:  custom design drawing Magnetizing mode: Radial 16 […]

Four Poles Ferrite Radial Magnetization Rotor Magnet

Four Poles Ferrite Radial Magnetization Rotor Magnet

Four Poles Ferrite Radial Magnetization Rotor Magnet, 4-poles Magnetization Hard Ferrite Ring Multi-pole Magnets, motor rotor permanent magnets, Radially Orientation Multi-pole Ceramic Magnetic Ring, Anisotropic multi-polar magnetic rings supplier Four Poles Ferrite Radial Magnetization Rotor Magnet Features: Specification size:  custom design drawing Magnetizing mode: Radial 4 poles Type: Permanent Composition: Sintered Ferrite Magnet (hard ceramic) […]

Sintered Ferrite Planar Multipole Rotor Magnet

Sintered Ferrite Planar Multipole Rotor Magnet

Sintered Ferrite Planar Multipole Rotor Magnet, Planar 12-poles Magnetization Hard Ferrite Ring Multi-pole Magnets, water flowmeter rotor magnet, Radially Orientation Multi-pole Ceramic Magnetic Ring, Anisotropic multi-polar magnetic rings supplier Sintered Ferrite Planar Multipole Rotor Magnet Features: Specification size:  custom design drawing Magnetizing mode: Radial 12 poles Type: Permanent Composition: Sintered Ferrite Magnet (hard ceramic) The […]

Planar Four Magnetization Ferrite Ring Multi-pole Magnets

Planar Four Magnetization Ferrite Ring Multi-pole Magnets

Planar Four Magnetization Ferrite Ring Multi-pole Magnets, Radially Orientation Multi-pole Ceramic Magnetic Ring for Household appliances water pump and pump motor, High performance Planar Radial Magnetization Anisotropic multi-polar magnetic rings supplier Planar Four Magnetization Ferrite Ring Multi-pole Magnets Features: The specifications of this product are 20*10*3 and 980gs. Specification size:  custom design drawing Magnetizing mode: […]

Radial Ferrite 24 poles Motor Encoder Hall Sensor Ring Magnets

Radial Ferrite 24 poles Motor Encoder Hall Sensor Ring Magnets

Radial Ferrite 24 poles Motor Encoder Hall Sensor Ring Magnets, Miniature Motor Hall Encoder Magnetic Ring of Balanced Car Motor, Radially Orientation Multi-pole Ceramic Magnetic Ring for Hall Induction Magnetic Encoder Motor, High performance Radial Magnetization Anisotropic multi-polar magnetic rings supplier Radial Ferrite 24 poles Motor Encoder Hall Sensor Ring Magnets Features: Specification size:  custom […]

Miniature Motor Hall Encoder Magnetic Ring of Balanced Car Motor

Miniature Motor Hall Encoder Magnetic Ring of Balanced Car Motor

Miniature Motor Hall Encoder Magnetic Ring of Balanced Car Motor, Radial Orientation Multi-pole Ceramic Magnetic Ring, Radially Multipole Sintered Ferrite Magnets for Hall Induction Magnetic Encoder Motor, High performance Radial Magnetization Anisotropic multi-polar magnetic rings supplier Miniature Motor Hall Encoder Magnetic Ring of Balanced Car Motor Features: Specification size:  custom design drawing Magnetizing mode: Radial […]

Radial Orientation Multi-pole Ceramic Magnetic Ring

Radial Orientation Multi-pole Ceramic Magnetic Ring

Radial Orientation Multi-pole Ceramic Magnetic Ring, Customized Radially Multipole Sintered Ferrite Magnets for air-conditioning motor rotor, Radial Magnetization multi-polar magnetic rings, Multi-Polars Permanent Hard Ferrite Anisotropic Ring Magnet Supplier Radial Orientation Multi-pole Ceramic Magnetic Ring Features: Specification size: OD 30MM * ID 21MM * H 25MM / custom design drawing Magnetizing mode: Radial 16 poles […]

Outer Diameter 43mm Multipolar Ceramic Ring Magnet

Outer Diameter 43mm Multipolar Ceramic Ring Magnet

Outer Diameter 43mm Multipolar Ceramic Ring Magnet, Customized Radially Multipole Sintered Ferrite Rotor Magnets, Multipole Radial Magnetization Ring Ceramic Magnets, Multi-Polars Permanent Hard Ferrite Anisotropic Ring Magnet Supplier 8 poles Outer Diameter 43mm Multipolar Ceramic Ring Magnet Features: Specification size: custom design drawing Magnetizing mode: Radial 8 poles Type: Permanent Composition: Sintered Ferrite Magnet (hard […]

8 poles Radial Magnetization Magnetic Ring of Fume Pumping Machine

8 poles Radial Magnetization Magnetic Ring of Fume Pumping Machine

8 poles Radial Magnetization Magnetic Ring of Fume Pumping Machine, Customized Radially Multipole Ferrite Rotor Magnets, Multipole Radial Magnetization Ring Ceramic Magnets, Multi-Polars Permanent Hard Ferrite Anisotropic Ring Magnet 8 poles Radial Magnetization Magnetic Ring of Fume Pumping Machine Features: Specification size: custom design drawing Magnetizing mode: Radial 8 poles Type: Permanent Composition: Sintered Ferrite […]

Customized Radial Multipole Ferrite Rotor Magnets

Customized Radial Multipole Ferrite Rotor Magnets

Customized Radial Multipole Ferrite Rotor Magnets, Magnetic Ring, Multipole Radial Magnetization Ring Ferrite Magnets, Multi-Polars Sintered Ceramic/Ferrite Permanent Motor Speed Measuring Magnets, Hard Ferrite Anisotropic Ring Magnet Customized Radial Multipole Ferrite Rotor Magnets Features: Specification size: custom design drawing Magnetizing mode: Radial 2,4,6 – 20, 44 poles Type: Permanent Composition: Sintered Ferrite Magnet Homogeneous ferrite […]

Hall Sensor Ferrite Radial 6-pole Magnetization Magnetic Ring

Hall Sensor Ferrite Radial 6-pole Magnetization Magnetic Ring

Hall Sensor Ferrite Radial 6-pole Magnetization Magnetic Ring, Customized Multipole Radial Ring Sensor Ferrite Magnets, Multi-Polars Ceramic Permanent Motor Speed Measuring Magnets, Hard Ferrite Isotropic Ring Magnet China Supplier Hall Sensor Ferrite Radial 6-pole Magnetization Magnetic Ring Features: Specification size: custom design drawing Magnetizing mode: Radial 6 poles Type: Permanent Composition: Ferrite Magnet Homogeneous ferrite […]

Four-Polars Multipole Ceramic Rings for Motor Magnetic Rotor

Four-Polars Multipole Ceramic Rings for Motor Magnetic Rotor

Four-Polars Multipole Ceramic Rings for Motor Magnetic Rotor, Customized Size Multipole Radial Ring Ferrite Magnets, multipole ceramic rings, Multi-Polars Ceramic Permanent Magnets, Hard Ferrite Isotropic Ring Magnet China Supplier Four-Polars Multipole Ceramic Rings for Motor Magnetic Rotor Features: Specification size: custom design drawing Magnetizing mode: axial 4 pole Type: Permanent Composition: Ferrite Magnet Homogeneous ferrite […]

8-Polars Multipolar Isotropic Ferrite Rings

8-Polars Multipolar Isotropic Ferrite Rings

8-Polars Multipolar Isotropic Ferrite Rings, Customized Size Multipole Radial Ring Ferrite Magnets, multipole ceramic rings, Multi-Polars Ceramic Permanent Magnets, Hard Ferrite Isotropic Ring Magnet China Supplier 8-Polars Multipolar Isotropic Ferrite Rings Features: Specification size: custom design drawing Magnetizing mode: axial 8 pole Type: Permanent Composition: Ferrite Magnet Homogeneous ferrite is one of the most common […]

Axial Four-pole Magnetic Ring with Concave Points

Axial Four-pole Magnetic Ring with Concave Points

Axial Four-pole Magnetic Ring with Concave Points, Customized Size Multipole Radial Ring Ferrite Magnets, multipole ceramic rings, Multi-Polars Ceramic Permanent Magnets, Hard Ferrite Four-Poles Isotropic Ring Magnet Axial Four-pole Magnetic Ring with Concave Points Features: Specification size: D21.2*7.5*3 Magnetizing mode: axial 4 pole Magnetic field strength: 1050gs Type: Permanent Composition: Ferrite Magnet This product is […]

4-pole Magnetized Ferrite Ring Water Meter Magnet

4-pole Magnetized Ferrite Ring Water Meter Magnet

4-pole Magnetized Ferrite Ring Water Meter Magnet, Multipoles Radial Ceramic Ring Magnet for Water Meter, 4-poles anisotropic multipolar ring ceramic instrument magnets, Sintered Ferrite Permanent Magnet 4-pole Magnetized Ferrite Ring Water Meter Magnet feature Product Material: Sintered Ferrite Size:  customized size Magnetization mode: 4-pole magnetization Magnet specifications: can be customized according to your specific specifications, […]

Speed Governor 24-poles Ferrite Multipolar Radial Magnet

Speed Governor 24-poles Ferrite Multipolar Radial Magnet

Speed Governor 24-poles Ferrite Multipolar Radial Magnet, Multipoles Ceramic Ring Magnet, 24 poles anisotropic multipolar ring ceramic magnets, DVD Movement Magnetic Ring Sintered Ferrite Magnet Axial Speed Governor 24-poles Ferrite Multipolar Radial Magnet feature Product Material: Sintered Ferrite Size: 26*18*6mm or customized size Table magnetic strength: 650-700gs Pole: 24-poles Pulse signal: 12 Magnet specifications: can […]

Multipolar Ceramic Ring Cylinder Magnet

Multipolar Ceramic Ring Cylinder Magnet

Multipolar Ceramic Ring Cylinder Magnet, 4 poles ceramic magnet ring, 6 poles Hard Ferrite Isotropic Multipole Radial Ring Magnet, Isotropic sintered ferrite magnets magnetic ring Multipolar Ceramic Ring Cylinder Magnet feature Material: hard ceramic magnet Specification: 20 * 10* 30mm Custom size Number of poles: 4, 6, 8, 12, 16 or other This product is […]

Plastic Bonded Strontium Ferrite Multipole Ring Magnet 72 poles

Plastic Bonded Strontium Ferrite Multipole Ring Magnet 72 poles

Plastic Bonded Strontium Ferrite Multipole Ring Magnet 72 poles 1.2mm pole length, Multipole Magnet Ceramic Ring for linear incremental (off-axis) position sensor, Bonded Ferrite Multipole Ring Multipole Ring Magnet Part No.: HS-MR12-72 Magnetisation Grade: BMNP-1612 Material: Plastic bonded Strontium Ferrite SrFe. Magnet Shape: Ring Magnet Size: inner diameter = 24mm, outer diameter = 32mm, thickness = 1.5mm Pole Length: 1.2 mm Poles […]

Magnetic Multipole Ring 1.0mm pole length, 128 poles

Magnetic Multipole Ring 1.0mm pole length, 128 poles

Ferrite Magnetic Multipole Ring 1.0mm pole length, 128 poles for linear incremental (off-axis) position sensor, Ceramic Multipole Ring Magnets, Plastic Bonded Strontium Ferrite Multipole Ring Magnet Multipole Ring Magnet Part No.: HS-MR10-128 Magnetisation Grade: BMNP-8L Material: Plastic bonded Strontium Ferrite SrFe. Magnet Shape: Ring Magnet Size:  inner diameter =38.5mm, outer diameter =42.5mm, thickness =1.5mm Pole Length: 1.0 mm Poles No.: 128 Poles […]

Hard Ferrite Isotropic Multipole Ring Magnet

Hard Ferrite Isotropic Multipole Ring Magnet

Hard Ferrite Isotropic Multipole Ring Magnet, Isotropic sintered ferrite magnets magnetic ring, Ferrite permanent ceramic sintered isotropic multipole magnet ring for stepping motor I:Hard Ferrite Isotropic Multipole Ring Magnet Part No. HSFIM Series Isotropic sintered ferrite magnets’ magnetic properties are low, they have nearly the same magnetic properties in all directions,can be magnetized in many […]