What is the difference between a strong magnet and a normal magnet?

There are significant differences between strong magnets and ordinary magnets in many aspects, and these differences make them have their own unique application value in different fields. The following is a detailed comparison of strong magnets and ordinary magnets:

1. Definition and basic characteristics
Strong magnets:
Strong magnets, also known as neodymium iron boron magnets, are a material with significant magnetic properties.
It is a third-generation rare earth permanent magnet material with the characteristics of small size, light weight but strong magnetic force.
The magnetic properties of strong magnets are much higher than those of traditional magnets, and they are one of the most cost-effective magnets at present.
Ordinary magnets:
Ordinary magnets, also known as ferrite magnets or general magnets, are common magnets in our daily lives.
Its magnetism is relatively weak, but it has the characteristics of low cost and strong corrosion resistance.
Ordinary magnets are usually dark black in appearance and do not require electroplating.

2. Appearance and surface treatment
Strong magnets:
The surface of strong magnets usually needs to be electroplated to improve their corrosion resistance and service life.
Common electroplating layers include nickel plating and zinc plating, which makes the appearance of strong magnets appear stainless steel or bluish white.
Strong magnets that have not been electroplated may appear brown in appearance.
Ordinary magnets:
Ordinary magnets usually have a dark black appearance, and because of their strong corrosion resistance, electroplating is usually not required.

3. Price and cost
Strong magnets:
Because strong magnets contain rare earth elements and the manufacturing process is relatively complex, their cost is relatively high.
The scarcity and price fluctuations of rare earth elements will also affect the market price of strong magnets.
Ordinary magnets:
Ordinary magnets have lower raw material prices and relatively simple manufacturing processes, so their cost is lower.
This makes ordinary magnets more cost-effective in the market and suitable for some application scenarios that do not require high magnetic properties.

4. Magnetic properties
Strong magnets:
The magnetic properties of strong magnets are very strong, more than 10 times that of ordinary magnets of the same specification size.
This gives strong magnets a significant advantage in application scenarios that require high magnetic properties.
Ordinary magnets:
The magnetic properties of ordinary magnets are relatively weak, and they are suitable for some daily application scenarios that do not require high magnetic properties.

5. High temperature resistance
Strong magnets:
The upper temperature limit of conventional strong magnets is usually 80℃, but there are also some strong magnets with high temperature resistance, whose upper temperature limit can reach 200℃.
However, the Curie temperature (i.e. the critical temperature at which magnetism disappears) of strong magnets is usually between 340 and 400℃.
Ordinary magnets:
The upper temperature limit of ordinary magnets is usually 300℃, and their Curie temperature is relatively high, generally between 450-460℃.
This makes ordinary magnets have better stability and durability in high temperature environments.

6. Application fields
Strong magnets:
Strong magnets are widely used in electroacoustics, electronic appliances, motors, mechanical equipment, medical care and other fields due to their strong magnetic properties and various advantageous characteristics.
For example, in electroacoustic equipment such as speakers, receivers, microphones, alarms, stage audio, car audio, etc., strong magnets play an important role.
In the field of electronics and electrical appliances, strong magnets are used in permanent magnetic mechanism vacuum circuit breakers, relays, electric energy meters, water meters and other equipment.
In the field of motors, strong magnets are widely used in various motors, such as VCM (voice coil motor), CD/DVD-ROM, generator, servo motor, etc.
In addition, strong magnets also play an important role in mechanical equipment (such as magnetic separators, magnetic cranes), health care (such as nuclear magnetic resonance instruments, magnetic therapy health products) and other fields.

Ordinary magnets:
Although ordinary magnets have weak magnetic properties, they are still widely used in many fields because of their low cost, easy processing and manufacturing.
For example, in toy manufacturing, ordinary magnets are used to make toys such as magnetic building blocks and magnetic puzzles.
In household appliances, ordinary magnets are used in refrigerator door seals, microwave oven turntable motors and other components.
In addition, ordinary magnets are also used in common items in daily life such as magnetic hooks and magnetic door locks.
In summary, there are significant differences between strong magnets and ordinary magnets in terms of definition, appearance, price, magnetic properties, high temperature resistance and application fields. These differences make them have their own unique application value and advantages in different fields. When choosing a magnet, a comprehensive consideration should be made based on the specific application scenario and needs to select the appropriate type of magnet.