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Samarium iron nitride (SmFeN) rare earth permanent magnet material is a new generation of rare earth permanent magnet material. It is mainly composed of rare earth element samarium (Sm) and transition metal iron (Fe), and nitrogen (N) element is introduced through nitriding process to form a compound with a specific crystal structure and excellent magnetic properties. Its chemical formula is usually expressed as Sm2Fe17N3. This material has the characteristics of high saturation magnetization intensity and high magnetocrystalline anisotropy field, showing unique advantages in the field of permanent magnet materials.

Rare earth nitrates are a class of compounds composed of rare earth elements and nitrate ions (NO₃^-). Their properties: Most rare earth nitrates are colorless crystals that are soluble in water; they have high thermal and chemical stability; rare earth nitrates are weakly acidic in solution; different rare earth ions will affect the color and fluorescence properties of rare earth nitrates. Their uses: Rare earth nitrates are widely used in the preparation of luminescent materials and fluorescent markers, such as phosphors, LEDs, liquid crystal displays, etc.; they are also used in the production of glass, ceramics and pigments to change the color and properties of materials; rare earth nitrates are also important raw materials for some catalysts and chemical reagents.

Rare earth fluorides (also known as rare earth fluorides) are often used as molten salt components (molten salt electrolysis method) or raw materials (calcium thermal reduction method) in the smelting of single or mixed rare earth metals, as additives in the processing and manufacturing of non-ferrous metallurgy, special alloys, lubricants (agents), coatings, welding fluxes, permanent magnetic materials, etc., and as catalysts in organic synthesis.

Rare earth elements are known as a treasure trove of new materials and "industrial vitamins" due to their unique 4f electronic structure. Rare earth oxide powders are a hot spot in the current development of rare earth materials. Particle size distribution is a very important performance indicator of rare earth oxide powders, which affects the different application ranges of rare earth oxides.

Rare earth oxyfluorides have the advantages of rare earth oxides and rare earth fluorides, that is, rare earth oxyfluorides have lower phonon energy than rare earth oxides and better thermal stability and durability than rare earth fluorides. Currently, research on rare earth oxyfluorides has become a hot topic.

Magnesium and its alloys are known as "green engineering materials of the 21st century" because of their lightweight, biodegradable and recyclable characteristics. Magnesium alloys have excellent thermal conductivity, high specific strength and specific stiffness, good mechanical properties and recyclability. They have important applications and broad development prospects in the fields of national defense, military products, automobile production, electronic components, etc.

Aluminum Alloy is relatively active. Under normal atmospheric conditions, an oxide film composed of α-Al₂O₃ and β-Al₂O₃ will naturally form on the surface, but the thickness is relatively thin. This makes the aluminum alloy matrix have a certain corrosion resistance in normal atmospheric environments, neutral and weak acid solutions. However, in environments with severe pollution, high humidity, coastal atmospheric environments, and other acidic and alkaline environments, the surface oxide film is difficult to have good corrosion resistance.