Application of green/black silicon carbide in wear-resistant coatings
Silicon carbide includes green silicon carbide(Mohs Hardness 9.4) and black silicon carbide(Mohs hardness 9.15)
Analysis of the application of silicon carbide in wear-resistant coatings
I. Performance advantages
Ultra-high hardness and wear resistance
The Mohs hardness of silicon carbide more than 9.0, and the Vickers hardness value is between 2500-3000 HV, which is far higher than traditional metal materials (such as steel, aluminum alloy) and other ceramic materials (such as WC-Co, CrC). Its hard and brittle characteristics can significantly reduce the wear rate of equipment in extreme environments such as high load and dry friction.
Excellent corrosion resistance
Silicon carbide coatings show stable chemical inertness in strong acids, strong alkalis and high-temperature corrosive media, and are suitable for corrosive environments such as chemical equipment and desulfurization systems.
High temperature stability
Silicon carbide has a melting point of up to 2700℃, and still maintains high strength and oxidation resistance at high temperatures, which is suitable for high-temperature scenes such as aerospace engine components and metallurgical equipment.
Self-lubricating properties
The microstructure of silicon carbide particles can reduce friction resistance, reduce equipment energy consumption, and improve operating efficiency.
2. Preparation technology
Plasma spraying
Use high-temperature plasma above 15,000℃ to melt silicon carbide powder and spray it onto the substrate at high speed to form a dense and uniform coating, which is suitable for high melting point material processing.
High energy combustion flame spraying (HVOF)
Spray silicon carbide powder onto the metal surface through supersonic airflow, with strong bonding force, suitable for the preparation of impact-resistant coating.
Cold spraying
The low-temperature process avoids material phase change and is suitable for the preparation of silicon carbide coatings on heat-sensitive substrates.
3. Application areas
Energy and chemical industry
Petroleum and natural gas equipment: used for high temperature and corrosion protection of pipelines, valves and other components. Desulfurization system: High molecular weight silicon carbide protective agent can repair the corrosion and wear of desulfurization towers and extend the life of equipment by more than 10 years.
Mining and metallurgy
The inner lining of mining machinery and mineral processing equipment adopts silicon carbide coating to resist the erosion of high-concentration dust-containing gases and materials. Aerospace
Key components such as turbine blades and engine parts utilize the high temperature stability and self-lubricating properties of silicon carbide coatings. Machinery manufacturing
Tools and bearings are coated with silicon carbide to improve wear resistance and reduce maintenance costs.
4. Technical optimization direction
Further improve the fracture toughness, impact resistance and oxidation resistance of silicon carbide coatings through nanocomposites, fiber reinforcement or surface coating modification (such as physical vapor deposition). For example, micro-nano composite structures can reduce crack propagation, while carbon fiber reinforcement can improve impact resistance.
The above content summarizes the core characteristics, preparation process and multi-industry applications of silicon carbide wear-resistant coatings, demonstrating its wide applicability and technical potential in the field of industrial protection.