Product introduction and application of black silicon carbide
Black silicon carbide (abbreviated as black silicon carbide) is an artificial non-metallic material made of quartz sand and petroleum coke as the main raw materials and smelted at high temperature in a resistance furnace. It has a black-gray or dark black appearance, extremely high hardness, good thermal conductivity and chemical stability. It is an excellent industrial raw material and is widely used in abrasives, refractory materials, metallurgy, ceramics, electronics and other fields.
Ⅰ. Performance characteristics of black silicon carbide
The Mohs hardness of black silicon carbide is as high as 9.2, second only to diamond and cubic boron nitride, and has extremely strong wear resistance and impact resistance. Its melting point is about 2700°C, which can maintain structural stability in high temperature environment and is not easy to decompose or deform. In addition, it has good thermal conductivity and low thermal expansion coefficient, and still shows excellent thermal shock stability under high temperature and high pressure conditions.
In terms of chemical properties, black silicon carbide has good corrosion resistance to acids and alkalis, and is particularly suitable for industrial use in harsh environments. Its high conductivity also makes it an alternative material for some electric heating materials and semiconductor fields.
Ⅱ. Main product forms and specifications
Black silicon carbide can be made into various forms according to different particle sizes and uses:
Block material: large crystals after smelting, often used for reprocessing or as metallurgical additives;
Granular sand (F sand/P sand): used to make grinding wheels, sandblasting abrasives, sandpaper, etc.;
Micro powder (W, D series): used for ultra-precision grinding, polishing, ceramic sintering, etc.;
Nano-level micro powder: used for high-end electronic ceramics, thermal conductive composite materials, etc.
The particle size ranges from F16 to F1200, and the particle size of micro powder can reach nanometer level, which can be customized according to the technical requirements of different application fields.
Ⅲ. Main application fields of black silicon carbide
1. Abrasives and grinding tools
Abrasives are the most traditional and most widely used application fields of black silicon carbide. Taking advantage of its high hardness and self-sharpening properties, black silicon carbide can be used to manufacture various abrasive products, such as grinding wheels, cutting discs, sandpaper, grinding heads, grinding pastes, etc., which are suitable for grinding and processing materials such as cast iron, steel, non-ferrous metals, ceramics, glass, quartz, and cement products.
Its advantages are fast grinding speed, not easy to clog, and high processing efficiency. It is widely used in metal processing, machinery manufacturing, architectural decoration and other industries.
2. Refractory materials
Black silicon carbide is widely used in the field of high-temperature refractory materials due to its high-temperature stability and corrosion resistance. It can be made into silicon carbide bricks, furnace linings, crucibles, thermocouple protection tubes, kiln tools, nozzles, tuyere bricks, etc., which are widely used in high-temperature industries such as metallurgy, non-ferrous metals, electricity, glass, and cement to extend equipment life and improve operation safety.
In addition, silicon carbide materials have good antioxidant properties in high-temperature oxidizing atmospheres and are suitable for key parts of hot blast furnaces, blast furnaces and other equipment.
3. Metallurgical industry
In the metallurgical process such as steelmaking and casting, black silicon carbide can be used as a deoxidizer, warming agent and carburizer. Due to its high carbon content and fast heat release, it can effectively improve the smelting efficiency and improve the quality of molten steel. At the same time, it can also reduce the impurity content in the smelting process and play a role in purifying molten steel.
Some steel mills also add a certain proportion of silicon carbide to the smelting of cast iron and ductile iron to adjust the composition, save costs and improve the performance of castings.
4. Ceramics and electronic materials
Black silicon carbide is also an important raw material for functional ceramics. It can be used to prepare structural ceramics, wear-resistant ceramics, thermal conductive ceramics, etc., and has broad prospects in the fields of electronics, chemical industry, machinery, etc. It has excellent thermal conductivity and a thermal conductivity of up to 120 W/m·K. It is often used in thermal conductive heat dissipation materials, thermal interface materials and LED heat dissipation components.
In addition, silicon carbide has gradually entered the field of power semiconductors and become the basic material for high-temperature and high-voltage devices. Although the purity of black silicon carbide is slightly lower than that of green silicon carbide, it is also used in some medium and low-voltage electronic products.
5. Photovoltaic and new energy industries
Black silicon carbide powder is widely used in the cutting of silicon wafers in the photovoltaic industry. As an abrasive in the diamond wire cutting process, it has the advantages of high hardness, strong cutting force, low loss, and smooth cutting surface, which helps to improve the cutting efficiency and yield of silicon wafers and reduce the loss rate and production cost.
With the continuous development of new energy and new material technologies, silicon carbide has also been developed for emerging fields such as lithium battery negative electrode additives and ceramic membrane carriers.
IV. Summary and Outlook
Black silicon carbide plays an irreplaceable role in many industrial fields with its excellent mechanical, thermal and chemical properties. With the continuous advancement of manufacturing technology, product particle size control, purity refining and the continuous expansion of application fields, black silicon carbide is developing towards high performance and precision.
In the future, with the rapid rise of industries such as new energy, electronic ceramics, high-end grinding and intelligent manufacturing, black silicon carbide will play an increasingly important role in the field of high-end manufacturing and become a core component of the advanced material technology system.
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