Ceramic Magnet

Why Choose Us?

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Expertise and Experience
20+ years of experience in the magnet industry, all our sales have 12+ years expertise and knowledge in various types of permanent magnets.

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Customization
Most of permanent magnets are customized according to drawing and requests.Be flexible in accommodating customer needs, whether it involves order adjustments, additional information, or other special requests.

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Diverse Product Range
Besides Neodymium magnet, we also provide Alnico magnet, Samarium Cobalt (SmCo) magnet, Ferrite(ceramic) magnet, Flexible magnet(Rubber magnet) and Magnetic Products.

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Quality Assurance
All magnets are under our strict quality control. We assure you what we offer is superior and quality products. From the beginning of the production to the inspection of finished goods, we pay attention to every detail and try our best to avoid any mistakes carefully.

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Effective Communication
Provide responsive and effective communication during the purchasing process, addressing any inquiries promptly and offering support to ensure a smooth transaction.

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Timely Delivery
15-30 days according to magnet order information.We promise timely delivery to ensure you receive the goods on time.

What Is Ceramic Magnet

Ceramic magnets (also known as "Ferrite" magnets) are part of the permanent magnet family, and the lowest cost, hard magnets available today. Composed of strontium carbonate and iron oxide, ceramic (ferrite) magnets are medium in magnetic strength and can be used at fairly high temperatures.

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Manufacturing Process of Ceramic Magnets

Ceramic (ferrite) magnets are composed of strontium carbonate and iron oxide.

Manufacturing: A powdered mixture of strontium carbonate and iron oxide is injected into a wet or dry press for forming. During this process, a magnetic field is applied in the direction of preferred magnetization to orient the material and increase the magnet's performance potential. This magnet is considered "oriented" (anisotropic). If not exposed to a magnetic field at time of formation, it is called "non-oriented" (isotropic).
After the molding process, the magnetic material is then sintered at about 2,000°F. The sintering process is similar to that of kilning ceramic pottery, thus the popular name "ceramic" magnet.
Lastly, the magnet is finished-ground to size with a diamond-bladed grinding wheel, magnetized, and inspected for shipment.

Tolerances: Pressed dimensions are either +/– 2% or +/– .025", whichever is greater. Cut dimensions are either +/– 3% or +/– .025", whichever is greater. Thickness tolerances are normally ground to +/– .005", according to International Magnetics Association (IMA).
Visual imperfections such as cracks, porosity, voids, surface finish, etc. (commonly found in sintered ceramic magnets) do not constitute cause for rejection. Chips are acceptable if no more than 5% of the pole surface is removed. Cracks are acceptable, provided they do not extend across more than 50% of the pole surface.

Magnetizing and Handling: Ceramic magnet material is extremely brittle and can chip or break if dropped on a hard surface, or if allowed to "jump at" an attracting object.
The weakest grade of ceramic material is grade 1, which is typically non-oriented. Grades 5 and 8 are oriented ceramic material. When making magnetic assemblies with ceramic, it is typically easier to magnetize the product after assembly.

Machining: Since ceramic material is so brittle, it requires special machining techniques and equipment. Lead times may vary, but we offer cutting and grinding of ceramic material to meet your specifications. Contact us for more information.

5 Facts About Ceramic Magnets

They are used in electric motors, lifting devices, stereo speakers, microwaves, communications systems and more. Like all magnets, ceramic magnets produce a magnetic field. But they feature a unique composition that sets them apart from the rest.

Also Known as Ferrite Magnets
Ceramic magnets are also known as ferrite magnets. This is due to their composition of iron oxide mixed with strontium carbonate. Iron oxide is essentially rust. Ceramic magnets are made mostly of iron oxide and a small amount of strontium carbonate. The combination of these ingredients results in a permanent magnet.

Made Via Extrusion
Most ceramic magnets are made via extrusion. Extrusion is a manufacturing process in which a material is forced through a narrow passage. To produce ceramic magnets, manufacturers will typically mix iron oxide mixed with strontium carbonate, after which they'll force it through dies. Following this extrusion process, sintering may be used along with grinding or shaping.

Heat Resistant
Magnets typically become weaker when exposed to heat. Fortunately, ceramic magnets are heat resistant. They can withstand more heat than other types of magnets while retaining their strength. It can take temperatures of up to 400 to 500 degrees Fahrenheit for a ceramic magnet to demagnetize. You should still try to keep them away from heat sources, but ceramic magnets are known for their heat-resistant properties. It takes extreme heat for ceramic magnets to demagnetize.

Available With Coatings
You can find ceramic magnets with or without coatings. A coating is simply a layer that's applied over the surface of a ceramic magnet. Most coatings are designed to enhance the physical properties of ceramic magnets. Zinc, for instance, is commonly used to protect ceramic magnets from corrosion. Polytetrafluoroethylene (PTFE), on the other hand, is used to protect ceramic magnets from breakage.

Customizable Magnetic Strength
The magnetic performance of ceramic magnets can be customized during the manufacturing process. This involves the application of a magnetic field. When a magnetic field is applied to a ceramic magnet during the manufacturing process, the magnetic performance will increase. As a result, ceramic magnets are more customizable than many other types of magnets.
Ceramic magnets are one of the most common types of permanent magnets. Also known as ferrite magnets, they are made via extrusion, offer excellent heat-resistant properties, are available with or without coatings and their magnetic performance can be customized.

Ceramic Magnet Types

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Hard ceramic magnetics
Hard ceramic magnetics are difficult to demagnetize due to their high coercivity, making them impossible to change. The strong and permanent magnetic field of hard ceramic magnets makes them ideal for applications that require strength and reliability. Since hard ceramic magnets are durable, they are used in telecommunications equipment that cannot fail and dependable.

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Moment magnets
Ceramic moment magnets have rectangular hysteresis loops. When they are in the presence of a small magnetic field, they become magnetized and saturated. Once the external magnetic field is removed, the magnet remains magnetized. This type of magnet is made from magnesium manganese ferrite and lithium manganese ferrite. They are an essential part of the memory cores of computers.

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Permanent ceramic magnets
Permanent ceramic magnets have a uniaxial anisotropic hexagonal structure. They can keep their strong properties for an extended period of time and can be used to generate a magnetic field. Permanent ceramic magnets are hard, which is the reason for their constant and consistent strength. They are used in refrigerators, microphones, automobile applications, and cordless appliances.

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Piezomagnetic ceramic magnets
Piezomagnetic ceramic magnets have material that is mechanically elongated or shortened in the direction of the magnetic field when magnetized. In piezomagnetic materials, a magnetic field is created when the material is placed under stress or other form of deformation. It is made possible in a material when things are missing from its crystal structure.
The use of piezomagnetic ceramic magnets can be found in transducers and magneto strictive parts for ultrasounds.

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Soft magnets
Soft ceramic magnets are ferrimagnetic with a cubic crystal structure. They are easy to magnetize and demagnetize. Soft ceramic magnets have a wide and varied number of applications, are produced in large quantities, and have a high output value. They are used for filters, transformers, radio cores, and tape recording and video heads.
One of the main methods for classifying soft ceramic magnets is by their low coercivity. The coercivity of a magnet is measured by their magnetic hysteresis loop or their magnetization curve.

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Spin ceramic magnet
The concept of a spin ceramic magnet is based on rotary magnetism where there are two perpendicular stable magnetic fields and an electromagnetic wave magnetic field. The combination of the various fields causes constant rotation. Though some metal magnets have spin magnetism, they are not sustainable because of their eddy current loss, which has made the use of ceramic magnets necessary.

The Advantages of Utilising Ceramic Magnets

One of the key advantages of ceramic magnets is their ability to operate at high temperatures. This makes them especially suitable for applications where other magnet types have been known to fail. With a typical working temperature range of up to 300°C, these magnets provide reliable performance in demanding thermal conditions.
Another exceptional advantage is the corrosion resistance of ceramic magnets. Unlike other magnet materials, ferrite magnets do not corrode in water. This ensures that they are durable and have a long-lasting life expectancy.

Grades and Properties of Ceramic Magnets

Soft ferrites that are used in transformer or electromagnetic cores contain nickel, zinc, and/or manganese compounds. They have a low coercivity and are called soft ferrites. The low coercivity means the material's magnetization can easily reverse direction without dissipating much energy (hysteresis losses), while the material's high resistivity prevents eddy currents in the core, another source of energy loss.
Semi-hard ferrites are in between soft and hard magnetic material and are usually classified as a semi-hard material. It is mainly used for its magnetostrictive applications like sensors and actuators thanks to its high saturation magnetostriction. Moreover, its magnetostrictive properties can be tuned by inducing a magnetic uniaxial anisotropy. This can be done by magnetic annealing, magnetic field-assisted compaction, or reaction under uniaxial pressure. This last solution has the advantage to be ultra-fast (20 min) thanks to the use of spark plasma sintering. The induced magnetic anisotropy in cobalt ferrite is also beneficial to enhance the magnetoelectric effect in the composite.
Hard ferrites, in contrast, permanent ferrite magnets are made of hard ferrites, which have a high coercivity and high remanence after magnetization. Iron oxide and barium or strontium carbonate are used in the manufacturing of hard ferrite magnets. The high coercivity means the materials are very resistant to becoming demagnetized, an essential characteristic for a permanent magnet. They also have high magnetic permeability.
The most common hard ferrites are:
Strontium ferrite used in small electric motors, micro-wave devices, recording media, magneto-optic media, telecommunication and electronic industry.
Strontium hexaferrite is well known for its high coercivity due to its magneto cry saline anisotropy. It has been widely used in industrial applications as permanent magnets and, because they can be powdered and formed easily, they are finding their applications into micro and nano-types systems such as biomarkers, bio diagnostics and biosensors.
Barium ferrite, a common material for permanent magnet applications. Barium ferrites are robust ceramics that are generally stable to moisture and corrosion-resistant.
Ceramic magnets offer several noteworthy benefits, one of which being a low cost. Statistics show roughly three-quarters of all magnets produced globally consist of ceramic magnets. As a result, they typically cost less than other magnets, such as rare-earth magnets.

Physical Properties of Ceramic Magnets

Curie Temperature	450°C (482°F)
Coefficient of Thermal Expansion	+7.0 - +15.0 x 10-6 °C-1
Electrical Resistivity	>1010 µO·cm
Density	4.8 - 4.9 g/cm-3
Vicker's Hardness	480 - 580 HV
Young's Modulus	170 kN·mm-2
Bending Strength	0.05 - 0.09 kN·mm-2
Compressive Strength	1.3 kN·mm-2
Tensile Strength	0.02 - 0.05 kN·mm-2

Our Factory

Everbeen Magnet is located in Xiamen, a coastal city on the southeast coast of China. It has ocean shipping and air shipment ports leading to all over the world, with a developed economy and convenient logistics.
Everbeen Magnet specializes in the development and processing of various permanent magnet materials such as NdFeB,Ferrite magnets and accessories, electronic components, and magnetic application devices. We have been deeply involved in the field of permanent magnet materials for more than 20 years. We can Adopt sophisticated process management and high-quality services to meet customer needs, accurately provide cost-effective products.

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FAQ

Q: What are ceramic magnets used for?

A: Ceramic magnets are used in a wide variety of applications. They power motors, such as DC brushless motors used in power tools as well as DC permanent magnet motors used in vehicles. They are also used in magnetic separation equipment to separate ferrous metal material from non-ferrous metal material.

Q: Are ceramic magnets powerful?

A: Ceramic magnets have a comparatively low magnetic field, registering at a mere 3.5 on the (BH)max scale, that's more than a tenth the strength of rare earth magnets. The (BH)max scale registers energy density and it used to measure the strength of magnetic force. The higher the (BH)max the better the magnet.

Q: What is the difference between neodymium and ceramic magnets?

A: Neodymium magnets are much stronger than ceramic magnets, with a maximum energy product that can reach up to 52 MGOe. In comparison, ceramic magnets have a maximum energy product of up to about 5 MGOe. This means that a neodymium magnet of the same size as a ferrite magnet is far stronger.

Q: What is the difference between flexible and ceramic magnets?

A: Flexible magnets are made of thermoplastic materials and can be bent without affecting their performance. Ceramic magnets, or hard ferrite magnets, are rigid and brittle provide good magnetic performance, and are generally economical.

Q: How long do ceramic magnets last?

A: Both ceramic and neodymium magnets are considered to be "permanent" magnets, meaning they will sustain a magnetic field for years unless damaged or otherwise broken.

Q: Can ceramic magnets get wet?

A: Unplated ceramic magnets can withstand wet environments without corroding. Any plating that is added is typically for aesthetics, or to help contain the ceramic dust that can be associated with ceramic magnets. Neodymium magnets need a plating to prevent corrosion.

Q: Do ceramic magnets stick to metal?

A: If the building uses metal studs, you can find them reliably with a ceramic magnet. And if your screw gun doesn't have one of those fancy magnetized grips, glue a magnet to the bottom and you just upgraded to something way more convenient.

Q: Why are they called ceramic magnets?

A: After the molding process, the magnetic material is then sintered at about 2,000°F. The sintering process is similar to that of kilning ceramic pottery, thus the popular name "ceramic" magnet.

Q: Do ceramic magnets conduct electricity?

A: Low conductivity magnets are used in applications where the magnet is required to have some electrical insulating properties, such as in transformers. Superconducting magnets are a special class of ceramics that are able to conduct electricity with no resistance and therefore no energy loss.

Q: Are ceramic magnets permanent?

A: Ceramic magnets (also known as "Ferrite" magnets) are part of the permanent magnet family, and the lowest cost, hard magnets available today. Composed of strontium carbonate and iron oxide, ceramic (ferrite) magnets are medium in magnetic strength and can be used at fairly high temperatures.

Q: Will ceramic magnets rust?

A: Ceramic magnets are very resistant to corrosion. Coatings can be applied for cosmetic reasons or to reduce the fine, ferrite powder which is associated with ceramic magnets.

Q: How do you make ceramic magnets stronger?

A: A ceramic magnet can be re-magnetized by exposing it to a strong, uniform magnetic field. Numbers vary, but we found that exposing it to a field strength of 8,000-10,000 gauss was enough to fully re-magnetize it.

Q: Can ceramic magnets be heated?

A: Fortunately, ceramic magnets are heat resistant. They can withstand more heat than other types of magnets while retaining their strength. It can take temperatures of up to 400 to 500 degrees Fahrenheit for a ceramic magnet to demagnetize.

Q: How hot can ceramic magnets get?

A: Although ferrite magnets come with a relatively lower maximum operating temperature of 250℃, they are widely used because of their lower cost.

Q: Are ceramic magnets the same as rare earth magnets?

A: A rare-earth magnet has a much higher performance than ceramic magnets and alnico magnets. Magnets of this type typically have a remanence exceeding 1.2 Tesla and are the strongest among permanent magnets.

Q: Are ceramic magnets used in refrigerators?

A: Permanent ceramic magnets are hard, which is the reason for their constant and consistent strength. They are used in refrigerators, microphones, automobile applications, and cordless appliances.

Q: Are ceramic magnets weak?

A: They are known for their medium magnetic strength and ability to withstand fairly high temperatures. Ceramic or ferrite magnets are mainly composed of strontium carbonates or barium carbonate, and iron oxide. They are the most affordable, hard markets available on the market today.

Q: How do you clean ceramic magnets?

A: To clean a magnet, you can wipe it off with a clean cloth and warm soapy water. Magnets should be cleaned to get rid of germs and obstructive debris that can get in between their magnetic field.

Q: What are ceramic magnets made of?

A: The raw materials used to produce ceramic magnets are strontium carbonate and iron oxide, each magnet consists of about 90% iron oxide and 10% strontium carbonate.

Q: Do ceramic magnets have poles?

A: With a low coercivity, soft ceramic magnets are able to change the position of their poles, making them ideal for applications like electrical conductors.

As one of the most professional ceramic magnet manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to buy customized ceramic magnet at competitive price from our factory.

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