Silicon micro powder is generally more than 100 meshes, and can be called silicon micro powder only when the silicon content is not less than 99.9%.
Silicon micropowder is made of pure quartz powder by advanced superfine grinding process, which is an inorganic non-metallic material with extremely wide use. It has excellent dielectric properties, low coefficient of thermal expansion, high thermal conductivity, good suspension performance and other advantages. Because of its excellent physical properties, extremely high chemical stability, unique optical properties and reasonable and controllable particle size distribution, it is widely used in optical glass, electronic packaging, electrical insulation, high-grade ceramics, paint coatings, precision casting, silicone rubber, medicine, cosmetics, electronic components and VLSI, mobile communication, laptop Aerospace and other production fields.
Silicon powder is also an important raw material for the production of polysilicon. Silicon micro powder is reacted with anhydrous hydrogen chloride (HCl) in a fluidized bed reactor to generate trichlorosilane (SiHCl3). After further purification, SiHCl3 is reduced and deposited into polysilicon in hydrogen. Polycrystalline silicon is the main raw material of solar cells in photovoltaic industry.
application area
1. Used in mortar and concrete: high-rise buildings, seaports and wharves, reservoir dams, water conservancy, culvert gates, railways, highways, bridges, subways, tunnels, airport runways, concrete pavements, coal mine laneways, bolting and shotcreting reinforcement, etc. 2. In the material industry: (1) The service life of high-grade high-performance low cement refractory castables and prefabricated parts is three times that of ordinary castables, the refractoriness is increased by about 100 ℃, and the high temperature strength and thermal shock resistance are significantly improved. It has been widely used in coke oven, iron making, steel making, steel rolling, nonferrous metals, glass, ceramics and power generation industries. (2) Large iron trench and ladle materials, breathable bricks, coating repair materials, etc. (3) Application of self flowing refractory casting materials and dry wet spraying construction. (4) Oxide bonded silicon carbide products (ceramic kiln furniture, flame barrier, etc.). (5) High temperature calcium silicate lightweight thermal insulation material. (6) Corundum mullite push plate for electric porcelain kiln. (7) High temperature wear-resistant materials and products. (8) Corundum and ceramic products. (9) Theron bonded products. At present, in addition to being widely used in castable refractories, it is also widely used in fused and sintered refractories. 3. New wall materials and finishing materials: (1) polymer mortar and thermal insulation mortar for wall insulation. (2) Cement based polymer waterproof material. (3) Lightweight aggregate thermal insulation energy-saving concrete and products. (4) Putty powder processing is used for internal and external wall construction. 4. Other uses: (1) raw material of silicate brick. (2) Production of water glass. (3) Used as reinforcing material for organic compounds. Its composition is similar to that of white carbon black produced by gas phase method. It can be used as filling and reinforcing material in rubber, resin, paint, paint, unsaturated polyester and other polymer materials. (4) It is used as anti caking agent in fertilizer industry.
Scope of application
Commercial concrete, high-strength concrete, self leveling concrete, unshaped refractory material, dry mixed (premixed) mortar, high-strength non shrinkage grouting material, wear-resistant industrial floor, repair mortar, polymer mortar, thermal insulation mortar, impermeable concrete, concrete compactor, concrete preservative, cement-based polymer waterproof agent; Reinforcement of rubber, plastic, unsaturated polyester, paint, coating and other polymer materials, modification of ceramic products, etc.
effect
Silica micro powder can fill the pores between cement particles, generate gel with hydration products, and generate gel with alkaline material magnesium oxide. Adding proper amount of silica fume into cement-based concrete, mortar and refractory castables can play the following roles: 1. Significantly improve the compression resistance, bending resistance, impermeability, corrosion resistance, impact resistance and wear resistance. Silica micropowder
2. It can keep water, prevent segregation and bleeding, and greatly reduce the pumping resistance of concrete. 3. Significantly extend the service life of concrete. Especially in the harsh environment such as chloride pollution erosion, sulfate erosion, high humidity, etc., the durability of concrete can be doubled or even multiplied. 4. The floor ash of sprayed concrete and castables is greatly reduced, and the thickness of single spraying layer is increased. 5. It is a necessary component of high-strength concrete, and has been applied to C150 concrete projects. 6. It has the effect of about 5 times of cement, and can reduce cost and improve durability when used in ordinary concrete and low cement castables. 7. Effectively prevent concrete alkali aggregate reaction. 8. Improve the compactness of castable refractories. When coexisting with Al2O3, mullite phase is easier to form, which enhances its high-temperature strength and thermal shock resistance.
