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.
Wholesale High Power Sintered Ferrite Arc Segment Magnet for Rotor

Wholesale High Power Sintered Ferrite Arc Segment Magnet for Rotor

Wholesale High Power Sintered Ferrite Arc Segment Magnet for Rotor, Permanent Arc Ferrite Magnet for Micro Motor with SGS & RoHS Certification, Anisotropic & Isotropic Hard Ferrite Magnet For Motor Generator, Arc Ferrite Magnet and Magnetic Stator Motor Permanent Arc Ferrite Ceramic Magnet China Supplier Wholesale High Power Sintered Ferrite Arc Segment Magnet for Rotor […]

High Resistance Dry Process Arc Hard Ferrite Isotropic Magnets

High Resistance Dry Process Arc Hard Ferrite Isotropic Magnets

High Resistance Dry Process Arc Hard Ferrite Isotropic Magnets, Strong Segment Pump Speaker Motor Tile Arc Ferrite Ceramic Magnet, Anisotropic & Isotropic Hard Ferrite Magnet For Motor Generator, Factory Customized Strong Permanent Ferrite Arc Motor Magnets China Supplier High Resistance Dry Process Arc Hard Ferrite Isotropic Magnets Feature: 1) Material: SrO or BaO and Fe2O3 […]

Electric Motors Arc Segment Hard Ferrite Anisotropic Magnet

Electric Motors Arc Segment Hard Ferrite Anisotropic Magnet

Electric Motors Arc Segment Hard Ferrite Anisotropic Magnet, Customize Permanent Arc Segment Sintered Ferrite Rotor Magnet, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Ferrite Magnet For Motor Generator China Supplier Electric Motors Arc Segment Hard Ferrite Anisotropic Magnet Feature: 1) Material: SrO or BaO and Fe2O3 by ceramic processing technology; 2) Grade:Y10T,Y20,Y25,Y30,Y30BH,Y35,C1,C5,C8,C8B,C9,C10,C11 and […]

Segment Ferrite Permanent Motor Rotor Magnets

Segment Ferrite Permanent Motor Rotor Magnets

Segment Ferrite Permanent Motor Rotor Magnets, Customize Permanent Arc Segment Sintered Ferrite Magnet, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Ferrite Magnet For Motor Generator China Supplier Segment Ferrite Permanent Motor Rotor Magnets Feature: 1) Material: SrO or BaO and Fe2O3 by ceramic processing technology; 2) Grade:Y10T,Y20,Y25,Y30,Y30BH,Y35,C1,C5,C8,C8B,C9,C10,C11 and so on. 3) Shape: tile, […]

Motor Rotor Magnetic Tile Permanent Ferrite Magnet

Motor Rotor Magnetic Tile Permanent Ferrite Magnet

Motor Rotor Magnetic Tile Permanent Ferrite Magnet, Customize Permanent Arc Segment Sintered Ferrite Magnet, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Ferrite Magnet For Motor Generator China Supplier Motor Rotor Magnetic Tile Permanent Ferrite Magnet Feature: 1) Material: SrO or BaO and Fe2O3 by ceramic processing technology; 2) Grade:Y10T,Y20,Y25,Y30,Y30BH,Y35,C1,C5,C8,C8B,C9,C10,C11 and so on. 3) […]

Segment Shape Ceramic Ferrite Magnet for Motor

Segment Shape Ceramic Ferrite Magnet for Motor

Segment Shape Ceramic Ferrite Magnet for Motor, Customize Permanent Arc Segment Sintered Ferrite Magnet, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Ferrite Arc Magnet For Rotors Motors Generators China Supplier Segment Shape Ceramic Ferrite Magnet for Motor Feature: 1) Material: SrO or BaO and Fe2O3 by ceramic processing technology; 2) Grade:Y10T,Y20,Y25,Y30,Y30BH,Y35,C1,C5,C8,C8B,C9,C10,C11 and so […]

Strong Anisotropic Ferrite Arc Magnets for Fuel Pump Motor

Strong Anisotropic Ferrite Arc Magnets for Fuel Pump Motor

Strong Anisotropic Ferrite Arc Magnets for Fuel Pump Motor, Customize Permanent Arc Segment Sintered Ferrite Magnet, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Ferrite Arc Magnet For Rotors Motors Generators China Supplier Strong Anisotropic Ferrite Arc Magnets for Fuel Pump Motor Feature: 1) Material: SrO or BaO and Fe2O3 by ceramic processing technology; […]

Customized Strong Arc Ferrite Magnet Material for Motor

Customized Strong Arc Ferrite Magnet Material for Motor

Customized Strong Arc Ferrite Magnet Material for Motor, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Factory Supplier Customized Strong Arc Ferrite Magnet Material for Motor Feature: 1. Material: SrO, BaO, Fe2O3. 2. Grade: C8 , C1, C5, Y10T, Y20, Y25, Y30, Y30BH, Y35, etc. […]

Sintered Arc Segment Tile Ferrite Permanent Magnets Y25

Sintered Arc Segment Tile Ferrite Permanent Magnets Y25

Sintered Arc Segment Tile Ferrite Permanent Magnets Y25, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Factory Supplier Sintered Arc Segment Tile Ferrite Permanent Magnets Y25 Feature: 1. Material: SrO, BaO, Fe2O3. 2. Grade: C8 , C1, C5, Y10T, Y20, Y25, Y30, Y30BH, Y35, etc. […]

Custom Anisotropic Segment Shape Ferrite Magnets Y32

Custom Anisotropic Segment Shape Ferrite Magnets Y32

Custom Anisotropic Segment Shape Ferrite Magnets Y32, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Factory Supplier Custom Anisotropic Segment Shape Ferrite Magnets Y32 Feature: 1. Material: SrO, BaO, Fe2O3. 2. Grade: Y10T, Y20, Y25, Y30, Y30BH, Y35, etc. 3. Size and Shape: Cylindrical,Arc, Segment, […]

Customized Anisotropic Y30H-1 Arc Ferrite Magnets

Customized Anisotropic Y30H-1 Arc Ferrite Magnets

Customized Anisotropic Y30H-1 Arc Ferrite Magnets, Customer Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Factory Supplier Customized Anisotropic Y30H-1 Arc Ferrite Magnets Feature: Material SrO, BaO, Fe2O3 Size All can customized Shape arc, segment, tile Grade  Y30H-1 Certification ROSH, SGS, TS16949, ISO14000, ISO9000 Application […]

Arc Isotropic Ferrite Permanent Magnets

Arc Isotropic Ferrite Permanent Magnets for Motor Rotor, Customer Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Factory Arc Isotropic Ferrite Permanent Magnets Feature: Material SrO, BaO, Fe2O3 Size All can customized Shape arc, segment, tile Grade Y25, Y30, Y30H-1,Y30BH,Y30H-2,Y33,Y35, C1, C5, C8, C9 Certification […]

Segment C5 Permanent Ceramic Magnets Supplier

Segment C5 Permanent Ceramic Magnets Supplier

Segment C5 Permanent Ceramic Magnets Supplier, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Factory Supplier Segment C5 Permanent Ceramic Magnets Supplier Feature: 1. Material: SrO, BaO, Fe2O3. 2. Grade: C8 , C1, C5, Y10T, Y20, Y25, Y30, Y30BH, Y35, etc. 3. Size and Shape: […]

Anisotropic Segment Shaped Ceramic Magnets C8

Anisotropic Segment Shaped Ceramic Magnets C8

Anisotropic Segment Shaped Ceramic Magnets C8, Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Factory Supplier Anisotropic Segment Shaped Ceramic Magnets C8 Feature: 1. Material: SrO, BaO, Fe2O3. 2. Grade: C8 , C1, C5, Y10T, Y20, Y25, Y30, Y30BH, Y35, etc. 3. Size and Shape: […]

Ferrite Arc Ceramic Magnetic Materials

Ferrite Arc Ceramic Magnetic Materials

Ferrite Arc Ceramic Magnetic Materials for Motor Rotor, Customer Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Supplier Ferrite Arc Ceramic Magnetic Materials for Motor Rotor Feature: Material SrO, BaO, Fe2O3 Size All can customized Shape arc, segment, tile Grade Y25, Y30, Y30H-1,Y30BH,Y30H-2,Y33,Y35, C1, C5, […]

Permanent Sintering Segment Ferrite Magnet for Motor Rotor

Permanent Sintering Segment Ferrite Magnet for Motor Rotor

Permanent Sintering Segment Ferrite Magnet for Motor Rotor, Customer Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Supplier Permanent Sintering Segment Ferrite Magnet for Motor Rotor Feature: Material SrO, BaO, Fe2O3 Size All can customized Shape arc, segment, tile Grade Y25, Y30, Y30H-1,Y30BH,Y30H-2,Y33,Y35 Certification ROSH, […]

Permanent Segment Arc Hard Ferrite Magnets for Rotor

Permanent Segment Arc Hard Ferrite Magnets for Rotor

Permanent Segment Arc Hard Ferrite Magnets for Rotor, Customer Strontium ferrite permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Supplier Permanent Segment Arc Hard Ferrite Magnets for Rotor Feature: Material SrO, BaO, Fe2O3 Size All can customized Shape arc, segment, tile Grade Y25, Y30, Y30H-1,Y30BH,Y30H-2,Y33,Y35 Certification ROSH, […]

Segment Ferrite Ceramic Permanent Magnet for Motors

Segment Ferrite Ceramic Permanent Magnet for Motors

Segment Ferrite Ceramic Permanent Magnet for Motors, Customer permanent Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Supplier Segment Ferrite Ceramic Permanent Magnet for Motors Feature: Material SrO, BaO, Fe2O3 Size All can customized Shape arc, segment, tile Grade Y25, Y30, Y30H-1,Y30BH,Y30H-2,Y33,Y35 Certification ROSH, SGS, TS16949, ISO14000, ISO9000 […]

Ceramic Segment Japanese Standard Ferrite Magnet for Motors

Ceramic Segment Japanese Standard Ferrite Magnet for Motors

Ceramic Segment Japanese Standard Ferrite Magnet for Motors, Cheap barium / strontium ferrite permanent magnets, OEM Magnetic materials, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For Rotors Motors Generators China Supplier Ceramic Segment Japanese Standard Ferrite Magnet for Motors Feature: Material SrO, BaO, Fe2O3 Size All can customized Shape arc, segment, tile Grade  FB6B, FB9B, […]

Sintered Permanent Segment Strong Ferrite Magnets for Motor

Sintered Permanent Segment Strong Ferrite Magnets for Motor

Sintered Permanent Segment Strong Ferrite Magnets for Motor, Small Cheap barium / strontium ferrite permanent magnets, OEM American Standard ceramic magnet, Anisotropic & Isotropic Hard Sintered Ferrite Arc Magnet For DC Motors Generators China Supplier Sintered Permanent Segment Strong Ferrite Magnets for Motor Feature: Material SrO, BaO, Fe2O3 Size All can customized Shape arc, segment, […]