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Hard Magnet/Ceramic Magnet

Ferrite magnets, also known as ceramic magnets, are permanent magnets composed primarily of iron oxide (Fe₂O₃) combined with barium carbonate (BaCO₃) or strontium carbonate (SrCO₃). They are sintered at high temperatures (up to 1,300°C) to form a hard, brittle material with a dark gray or black appearance. These magnets are cost-effective, corrosion-resistant, and stable at high temperatures (up to 250°C), making them ideal for applications where rare-earth magnets like neodymium are unnecessary. They are widely used in motors, speakers, sensors, and industrial equipment due to their balance of performance and affordability.

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Overview

Product Specifications

Material Composition: Iron oxide (Fe₂O₃) + barium/strontium compounds (e.g., SrO·6Fe₂O₃ or BaO·6Fe₂O₃)

Shapes: Blocks, discs, rings, arcs, cylinders, and custom designs

Magnetic Properties:

Residual Induction (Br): 370–400 mT (e.g., Y30 grade)

Coercive Force (Hc): 175–220 kA/m

Energy Product (BH)max: 26–30 kJ/m³ (3.3–3.8 MGOe)

Temperature Range: -40°C to +250°C (up to +300°C in special cases)

Density: ~4.8 g/cm³

Product Grades

Ferrite magnets are classified into grades based on magnetic performance, with common grades including:

Y20/Y25/Y30/Y35: General-purpose grades for motors and speakers

Y30BH/Y33BH: Higher coercivity for demanding applications

C5 (Y30): Standard grade for industrial separators

C8 (Y30H-1): Premium grade for loudspeakers and high-performance motors

Grade 8 (C8) offers the strongest magnetic properties among ceramic ferrites

Applications

Ferrite magnets are versatile and used in:

Electronics: Speakers, sensors, microwave oven coils

Industrial: Magnetic separators, DC motors, lifting systems

Automotive: Fan motors, wiper motors, starter motors

Consumer Goods: Refrigerator magnets, toys, educational tools

Marine/Aerospace: Corrosion-resistant components

Packaging Information

Standard Packaging: Cartons, pallets, or fiber drums for bulk orders (e.g., 25 kg pails, 1-ton super sacks)

Special Handling: Hygroscopic materials may be vacuum-sealed or argon-packed

Shipping: Available via air, sea, or courier (e.g., UPS, FedEx)

Hard Magnet/Ceramic Magnet

FAQs

1. Are ferrite magnets strong?

They are weaker than neodymium magnets (~1/7th the pull force) but cost-effective for low-power applications

2. Do they rust?

No, their oxidized iron composition prevents corrosion

3. Can they be customized?

Yes, shapes and sizes can be tailored, but complex designs may require grinding due to brittleness

4. What is the lead time?

Typically 7–15 days for production; stock items ship immediately

5. Temperature limits?

Stable up to 250°C but may demagnetize below -20°C

Application

Manufacturing

The manufacturing and industrial sectors utilize magnets in many ways. Magnetic separators are widely used to remove metal contaminants from raw materials in mining, food processing, and recycling industries. In automated manufacturing processes, magnetic grippers are employed to handle...
Electronics

In the electronics industry, magnets are essential components. Hard disk drives (HDDs) use tiny but powerful magnets to read and write data. The magnetic heads in HDDs can detect the magnetic fields representing digital information on the spinning disks. Speakers, whether in headphones...
Healthcare

The healthcare industry also benefits greatly from magnets. Magnetic Resonance Imaging (MRI) is one of the most significant medical applications. MRI machines use strong magnetic fields to generate detailed images of the inside of the human body. By aligning the protons in the body's tissues and detecting...
Automotive

In the automotive industry, magnets play a crucial role. Electric and hybrid vehicles rely on powerful magnets in their electric motors. These magnets enable the conversion of electrical energy into mechanical energy, which drives the vehicle. The use of high - performance magnets...