MAGNET MATERIALS
1. Neodymium magnet
It is the strongest of all magnets. Its maximum magnetic force can reach 1.6 T. Just by adsorbing a 1 cm diameter neodymium magnet, it is so strong that ordinary people cannot easily separate them.
The components of the magnet react very strongly with oxygen at room temperature, so it is very easy to rust, so the surface must be covered with a protective layer, usually nickel-plated.
The change in magnetic force with temperature is relatively large, with a low Curie temperature, low working temperature, so in the case of high temperature use, it is necessary to choose a suitable shape and grade.
Neodymium magnets are brittle and very fragile, so strong impacts must be avoided when used.
Neodymium magnets have a silver metallic color, so they are also called white magnets.
2. Samacoban Magnet
Although the magnetic force is slightly reduced (about a quarter) compared to neodymium magnets, it is still a fairly strong magnet.
Its composition is difficult to rust, so no surface treatment such as plating is required.
It has a high Curie temperature (about 1200 degrees), the magnetic force changes relatively small compared to temperature, so it is suitable for applications that require high temperature stability and high temperature use.
Samacoban magnets are brittle, very fragile, so strong impacts must be avoided when used.
The appearance is grayish white.
3. Ferrite Magnet
The magnetic force is about 1/5 to 1/10 of neodymium magnets.
It is a commonly used black magnet and is used in low magnetic force application details.
Since iron oxide is the main raw material, there is no concern about corrosion such as rust, so it can be used stably even in outdoor or high humidity environments.
It has relatively stable magnetic properties, but when used in an environment below 30 °C, it is also necessary to be careful with low-temperature demagnetization.
It is relatively fragile and requires careful handling.
Since it is rust-resistant, no surface treatment (plating) is required.
The appearance is dark gray.
4. Alnico magnet
The magnetic force is about 1/5 to 1/10 of neodymium magnets.
No surface treatment such as plating is required, because it is difficult to rust even if it is a magnet material.
The magnet has a good temperature change rate (temperature drop rate) of magnetic force and is capable of high temperature use.
However, the impact is likely to reduce the magnetic force, so care must be taken in handling and use.
The appearance is grayish white.
5. Rubber magnet
There are two types of rubber magnets (rubber magnets): ferrite rubber magnets formed by mixing ferrite magnet powder with synthetic rubber and neodymium rubber magnets mixed with neodymium magnet powder.
Ferrite rubber magnets have weak magnetic force, so care must be taken when applying.
Both are flexible and shaped like sheets. It is a magnet that is easy to process such as cutting and drilling and is flexible.
Due to the low heat resistance of rubber, all rubber magnets are not suitable for use at high temperatures such as 80 to 100°C or higher.
