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 …
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.
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.
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.
- Production Flow Chart of Hard Ferrite Magnet
- Magnetic Property of Hard Ferrite Magnet
- Main Physical & Mechanical Properties of Hard Ferrite Magnet
- Demagnetization Curves of Hard Ferrite Magnets
- Applications of Ferrite Magnets
- Support Custom Ferrite Magnets and Assemblies
|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.
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 […]
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, 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 […]
Multipole Radial Ferrite Magnet Ring Tube Shaped, Ferrite Anisotropic Multipolar Ring Magnets, Multi-Polar Ceramic Ring, Customized Magnet with Multi-Poles, Hard Ferrite Permanent Magnets for Motor Items Multipole Radial Ferrite Magnet Ring Tube Shaped Ceramic Magnet Material Ferrite magnet is made of Fe2O3 (80%) and Either BaCO3 or SrO3(20%) by Ceramic processing technology. Some additives such as Cobalt […]
Y30 Y35 Ferrite Anisotropic Multipolar Ring Magnets, Multi-Polar Ceramic Ring, Customized Ferrite Ring Magnet with Multi-Poles, Multipole Radial Ring Haed Ferrite Permanent Magnets, magnetic rings Y30 Y35 Ferrite Anisotropic Multipolar Ring Magnets Features: Type: Permanent Magnetocrystalline Anisotropy: Isotropic Magnet Application: Industrial Magnet, Motor Magnet Shape: Cylinder Ring Coating: No Composition: Ferrite Magnet HangSeng Magnetics now […]
Multi-Polar Ceramic Ring Magnets, Customized Size Ferrite Ring Magnet with Multi-Poles for Motor or Rotor, Multipoles Radial Ring Ferrite Magnets, magnetic rings, Y35 Hard Ferrite 4-Poles 6-Poles 10-poles Isotropic Ring Magnet Multi-Polar Ceramic Ring Magnets Features: Type: Permanent Magnetocrystalline Anisotropy: Isotropic Magnet Application: Industrial Magnet, Motor Magnet Shape: Cylinder Ring Coating: No Composition: Ferrite Magnet […]
Customized Size Ferrite Ring Magnet with Multi-Poles for Motor, Multipole Radial Ring Ferrite Magnets, multipole magnetic rings, Multi-Polars Ceramic Rings, Hard Ferrite Four-Poles Six-Poles Isotropic Ring Magnet Customized Size Ferrite Ring Magnet with Multi-Poles for Motor Features: Type: Permanent Magnetocrystalline Anisotropy: Isotropic Magnet Application: Industrial Magnet, Motor Magnet Shape: Cylinder Ring Coating: No Composition: Ferrite […]
Customized Shaped Ferrite Magnets, Special / Irregular shape Hard Ferrite Sintered Magnets, Customized Ceramic Magnet Customized Shaped Ferrite Magnets also known as ceramic custom magnets, are offered in a wide range of sizes, dimensions and different proportions or scales. Our customer shaped ferrite magnets are a low cost but versatile and multipurpose type of magnet. Various shaped ferrite magnets […]
Customized Ceramic Ferrite Rings, Custom Ring Ceramic Magnets, Hard Ferrite Ring Magnets, Strontium Ferrite Isotropic Anisotropic Magnets, Ring Shaped Hard Ferrite Magnets, Sintered Ceramic Custom Magnet, Magnetic Rings China Factory Customized Ceramic Ferrite Rings Features: Part No.: HS-FMR Material: Ferrite/Ceramic magnet Shape: ring Grade:Y30,Y25, Y35, Y33, Y40, C5, C8, C1, etc. Magnetic properties: Hcj,Hcb,BH,Br,BHmax,working temperature […]
Ferrite Arc Starter Motor Magnets, Ferrite Sectors For Starter Motors, Hard Ferrite Automotive Starter Motor Magnets PMSM , China Segment Ceramic Permanent Magnets Manufacturer Starter Motor Magnets – In the old days, motors used to be started by hand with a removable crank handle or other varius method. Fortunately, nowadays motors are started automatically by what […]
Motor Permanent Magnets Ferrite Arc, Arc Segment Ferrite Magnet for generator, Sintered Ferrite Arc Segment Tile shape Magnets, High Strength Small Y30BH Segment Ferrite Magnet Electric Motor Magnets China Factory Motor Permanent Magnets Ferrite Arc Features: Part No.: HS-FAM Material: Ferrite / Ceramic Shape: ARC, SEGMENT As the request of clients (size, dimension, shape, material, […]
Super Strong Ferrite Arc Magnets, Automotive Motor Permanent Ferrite Segments, Sintered Ferrite Arcs, Segment shape Ferrite Ceramic Magnets for motor and rotor, Segment Hard Ferrite Magnet, Ferritemagnet China Supplier Super Strong Ferrite Arc Magnets Features: Part No.: HS-FAM Material: Ferrite / Ceramic Shape: ARC, SEGMENT As the request of clients (size, dimension, shape, material, plating, […]
Hard Ceramic Arc Magnets, Motor Ferrite Permanent Magnets, Arc Segment Ferrite Magnet for electric Motors, Sintered Ferrite Arc Segment Tile shape Generator Magnets, High Strength Segment Ceramic Magnet Electric Motor Magnets China Factory Motor Permanent Magnets Hard Ceramic Arc Magnets Features: Part No.: HS-FAM Material: Ferrite / Ceramic Shape: ARC, SEGMENT Size: As the request […]
Strontium Barium Ferrite Magnets, Sr/Ba Ferrite Magnet, ferrite permanent magnets, Ferrite cores for electronics industry, Hard & Soft ferrite magnet, Sr/Ba Ferrite compounds for electronic inductors, transformers, and electromagnets Sr/Ba Strontium Barium Ferrite Magnets – Ferrite is a type of ceramic compound composed of iron(III) oxide (Fe2O3) combined chemically with one or more additional metallic […]
Sr/Ba Ferrite Magnet, Strontium ferrite magnets, Barium ferrite permanent magnets, Ferrite cores, Hard ferrite magnet, Sr/Ba Ferrite compounds Sr/Ba Ferrite Magnet – Ferrite is a type of ceramic compound composed of iron(III) oxide (Fe2O3) combined chemically with one or more additional metallic elements.They are both electrically nonconductive and ferrimagnetic, meaning they can be magnetized or […]
FC-280 Ferrite Industrial Motor Magnets, Arc Ferrite Motor Magnet, magnetic tile, wholesale cheap arc segment ferrite magnet, Y25-Y30BH Arc Hard Ferrite Magnet for PSC Motors, ceramic motor magnets FC-280 Ferrite Industrial Motor Magnets Feature: Name: 5812P magnetic tile Width of chord: 17 ±0.2mm Axis height: 16.6 ±0.3mm Wall Thickness: 3.6 + 0.1mm Arch height: 7.9 […]
5812P Arc Ferrite Motor Magnet, Arc Ferrite Magnet For Industrial Motors, magnetic tile, wholesale cheap vibro motors arc segment ferrite magnet, ceramic motor magnets 5812P Arc Ferrite Motor Magnet Feature: Name: 5812P magnetic tile Width of chord: 30 + 0.3mm Axis height: 45 +0.3mm Wall Thickness: 3.85 + 0.1mm Arch height: 11.7mm Internal arc: R13mm […]
Rare Earth Tiny Magnets, Tiny Magnets, Tiny SmCo & NdFeB Magnets, Micro Precision Magnets, Minisize Magnets, Mini-sized Magnets Tiny Magnets also kown as Tiny Rare-earth Magnets, Micro Magnets, Precision Magnets Precise micro magnets fabrication of SmCo, NdFeB and Hard Ferrite magnetic material. Fabrication of super hard material & micro size components by adopting advance machine tools and laser […]
Bonded Ferrite Magnets, Ferrite Bonding Magnets, Injection Moulded or Compression Bonded Ferrite Magnets Bonded Ferrite Magnets are manufactured by mixing magnets with binders like epoxy. These bonded magnetic materials can be either Injection Moulded or Compression Bonded. Normally there are two types of bonded ferrite magnets – ferrite rubber bonded magnet and ferrite-plastic bonded magnets. Ferrite-rubber bonded magnets are […]
Ferrite Ring Magnets, Sintered Hard Ferrite Ring Magnets, Ceramic Ring Magnets Ferrite ring magnets also known as ceramic rings, are often used in loudspeakers and in resonance imaging and torque drives. Some applications for this permanent magnet are: speaker, holding, door closures, joinery, and light fixture. Our ferrite rings are comparable to disc magnets but with a hole in the […]