1.What is metal silicon powder?
Metal silicon powder is a fine powder made of metal silicon after grinding and other processes. Metal silicon, also known as crystalline silicon or industrial silicon, is mainly produced by reducing silica (silicon dioxide) with carbon in an electric furnace.
Metal silicon powder is usually gray or silver gray with fine texture. It has high purity, good chemical stability and thermal stability. Its main component is silicon, and the silicon content is generally above 98%. However, some metal silicon powder with a silicon content exceeding 99% will also appear black. At the same time, metal silicon powder also contains a small amount of impurity elements such as iron, aluminum, and calcium, but their content is usually very low and will not have a significant impact on its performance.
2.How to produce metal silicon powder
The production of metal silicon powder mainly includes the following steps:
Raw material preparation: Select high-purity silica and high-quality carbonaceous reducing agent, such as charcoal, petroleum coke, etc.
Electric furnace smelting: After mixing silica and carbonaceous reducing agent in a certain proportion, add them into the electric furnace for high-temperature reduction reaction to generate metal silicon.
Crushing and grinding: Crushing and grinding the metal silicon block into fine powder, namely metal silicon powder.
Grading and screening: Through the grading and screening equipment, the metal silicon powder is classified according to different particle sizes to meet the needs of different customers.
3.Application of Metal Silicon Powder
Metallurgical industry
In steel production, metal silicon powder can be used as a deoxidizer and alloy additive. It can combine with oxygen in steel to form stable oxides, thereby reducing the oxygen content in steel and improving the quality of steel. According to statistics, adding about 10-30 kilograms of metal silicon powder per ton of steel can significantly improve the strength, hardness and wear resistance of steel.
In the foundry industry, metal silicon powder can be used to produce ductile iron and gray cast iron. It can promote the precipitation of graphite and improve the structure and properties of cast iron. For example, in the production of ductile iron, adding an appropriate amount of metal silicon powder can increase the spheroidization rate, making the castings denser and stronger.
Refractory industry
Metal silicon powder can be used as an additive for refractory materials to improve the high temperature strength and corrosion resistance of refractory materials. Adding metal silicon powder to refractory materials such as magnesia carbon bricks and alumina magnesia carbon bricks can form a dense ceramic phase and enhance the corrosion resistance of refractory materials.
Metal silicon powder can also be used to produce siliceous refractory materials, such as silica bricks and siliceous amorphous refractory materials. These refractory materials have good high temperature resistance and chemical stability and are widely used in high temperature industrial fields such as steel, glass, and ceramics.
Electronics Industry
Because metal silicon powder has high purity and good conductivity, it is widely used in the manufacture of semiconductor materials and electronic components. In the fields of integrated circuits, solar cells, etc., metal silicon powder is one of the important raw materials. For example, in the production of solar cells, metal silicon powder can be made into high-purity silicon wafers through a series of processing processes as the core components of solar cells.
Metal silicon powder can also be used to manufacture electronic ceramic materials, such as capacitor ceramics, piezoelectric ceramics, etc. These electronic ceramic materials have good dielectric properties and mechanical properties and are widely used in electronic communications, aerospace and other fields.
In short, as an important industrial raw material, metal silicon powder plays an irreplaceable role in modern industry with its unique properties and wide application. With the continuous advancement of science and technology and the continuous growth of market demand, the application field of metal silicon powder will continue to expand, and the market prospect will be broader.