FAQ

A permanent magnet refers to a magnet that can maintain its magnetism for a long time , called a hard magnet , which is not easy to lose its magnetism, and is not easy to be magnetized . However, if the permanent magnet is heated above the Curie temperature , or placed in an environment with a reverse high magnetic field strength , its magnetism will also decrease or disappear.

An electromagnet is a device that uses electric current to generate magnetic force . It is an indispensable tool in a society where electricity is popularized. It is a non-permanent magnet and is the same as a permanent magnet .

Sintering is a process in which solid materials are pressed and formed. During the manufacturing process, heat and/or pressure are applied to the material, but the heating temperature will be lower than the melting point of the material. The production of pottery is sintered, and the process of sintering metal powder into products is called powder metallurgy .

Hot isostatic pressing ( Hot isostatic pressing , abbreviation: HIP) is a manufacturing process used to reduce pores in metals or increase the density of ceramic materials. This improves the mechanical properties and processability of the material.
In the hot isostatic pressing process, the material is simultaneously subjected to high temperature and high pressure in all directions in a closed container. The pressure gas is an inert gas to avoid chemical reaction with the material, generally argon . Use an inert gas so that the material does not react chemically. The chamber is heated, causing the pressure inside the container to increase. Many systems use an associated air pump to achieve the necessary pressure levels. Pressure is applied to the material from all directions (hence the use of the term "isobaric").
Hot isostatic pressing is also used as part of the sintering ( powder metallurgy ) process and the fabrication of metal matrix composites .

Young's modulus , also known as Young's modulus , is generally called elastic modulus , which is a term in material mechanics . When an elastic material is subjected to a positive stress , it will produce a positive strain . When the deformation does not exceed a certain elastic limit of the corresponding material, the ratio of the positive stress to the positive strain is defined as the Young's modulus of the material.

Paramagnetism refers to the magnetic state of a material. Some materials can be affected by an external magnetic field, producing the property of a magnetization vector in the same direction as the external magnetic field . Such substances have a positive magnetic susceptibility . The opposite phenomenon of paramagnetism is called diamagnetism .

Diamagnetism , also known as diamagnetism ) is a magnetic phenomenon in which certain types of substances , when placed in an external magnetic field , will produce a weak repulsion to the magnetic field.

In electromagnetism , magnetic susceptibility is a physical quantity that characterizes the degree of magnetization of a substance in an external magnetic field .

Magnetic moment is a physical property of magnets. A magnet in an external magnetic field will feel a torque , which will make its magnetic moments align along the direction of the magnetic field lines of the external magnetic field . Magnetic moments can be represented by vectors . The direction of the magnetic moment of a magnet is from the guide pole of the magnet to the north pole , and the magnitude of the magnetic moment depends on the magnetism and magnitude of the magnet. Not only magnets have magnetic moments, but current-carrying circuits , electrons , molecules , or planets , etc., all have magnetic moments.

A magnet or magnet is an object that attracts iron and generates a magnetic field outside it . Magnets in the narrow sense refer to products made of magnetite ore , and magnets in the broad sense refer to objects or devices that are used to generate a magnetic field.

A magnetic field is a vector field that describes the magnetic influence (magnetic effect, magnetic action) on moving charges , electric currents , magnetic materials . A charge moving in a magnetic field experiences a force perpendicular to its own velocity and perpendicular to the magnetic field .

Magnetic induction intensity, also known as magnetic flux density or magnetic flux density, is a physical quantity representing the magnetic flux passing through a standard area, and its symbol is b. Its SI derived unit is Tesla (T); in the Gaussian unit system, the unit is Gauss (G or Gs).