Plaque céramique en carbure de silicium frittée sans pression, résistante à l'usure et d'une grande dureté

Pressure free sintered silicon carbide ceramic plate is a high-performance ceramic material made by sintering high-purity ultrafine silicon carbide powder at high temperatures (1950-2100 ℃) in an inert gas or vacuum environment. This process does not require external pressure, making it cost-effective and capable of producing materials with high density and uniform microstructure.

Caractéristiques des matériaux
（1） High hardness and wear resistance
The hardness of silicon carbide ceramic plates is extremely high, with a Mohs hardness close to diamond and excellent wear resistance. This enables it to significantly extend its service life and reduce replacement frequency when facing high wear conditions.
（2） High strength and toughness
Under the action of appropriate additives, pressureless sintered silicon carbide can achieve high strength and toughness. Even in high-temperature environments, its mechanical properties can remain stable, with a flexural strength of over 400MPa.
（3） High temperature resistance and oxidation resistance
The pressureless sintered silicon carbide ceramic plate can maintain its performance basically unchanged at temperatures up to 1600 ℃. At the same time, it has excellent antioxidant properties and can work stably for a long time in high-temperature oxidation environments.
（4） Low thermal expansion coefficient and thermal shock resistance
The thermal expansion coefficient of silicon carbide ceramic plate is extremely low, only 4.0 × 10 ⁻⁶/K. This means that in environments with rapid temperature changes, the size of the material changes very little and can effectively resist thermal shock, making it less prone to cracking or damage.
（5） Chemical corrosion resistance
The Si-C bonds in silicon carbide have extremely high bond energy, making the material difficult to corrode in corrosive media such as acid and alkali. This enables silicon carbide ceramic plates to be widely used in corrosive environments such as chemical and metallurgical industries.
（6） Good thermal conductivity
The thermal conductivity of silicon carbide ceramic plates is between 30-110W/(m · K), which can quickly conduct heat, effectively reduce local temperature, and improve the thermal stability of equipment.

Processus de production
The production process of pressureless sintered silicon carbide ceramic plates mainly includes the following steps:
（1） Powder preparation
Using high-purity ultrafine silicon carbide powder as raw material, the particle size is usually between 0.5-1.0 μ m. This ultrafine powder can improve the density and properties after sintering.
（2） Forming process
Multiple molding processes can be used, such as dry pressing, cold isostatic pressing, and casting. These processes can break through the limitations of product shape and size, meeting the needs of different application scenarios.
（3） Sintering process
At high temperatures of 1950-2100 ℃, silicon carbide powder is sintered in an inert gas or vacuum atmosphere by adding a small amount of sintering aids (such as boron, aluminum, etc.). This pressureless sintering process can effectively reduce stress concentration and defects inside the material, and improve the overall performance of the material.

Domaine d'application
（1） Mechanical seals and bearings
The high strength, wear resistance, and low friction coefficient of silicon carbide ceramic plates make them ideal materials for mechanical seals and bearings. For example, in high-speed rotating equipment such as aerospace engines and automotive engines, silicon carbide ceramic bearings can significantly improve the reliability and service life of the equipment.
（2） High temperature equipment
Due to its excellent high temperature resistance and thermal shock resistance, silicon carbide ceramic plates are widely used in high-temperature equipment such as kiln furniture, heat exchangers, combustion nozzles, etc. In these high-temperature environments, silicon carbide ceramic plates can maintain stable performance, effectively improving the operational efficiency and service life of equipment.
（3） Chemical and Metallurgical Engineering
In the chemical and metallurgical industries, silicon carbide ceramic plates can be used to manufacture various wear-resistant and corrosion-resistant components, such as pipes, valves, nozzles, crucibles, etc. Its excellent chemical corrosion resistance and wear resistance can effectively resist the erosion of harsh environments and reduce maintenance costs.
（4） Semiconductors and Electronics
The high purity, high thermal conductivity, and good electrical insulation of silicon carbide ceramic plates make them an ideal material for semiconductor manufacturing and electronic devices. For example, it can be used to make components such as grinding discs, suction cups, and crystal boats for semiconductor equipment.
（5） Bulletproof and Armor
The high hardness and strength of silicon carbide ceramic plates make them high-quality materials for manufacturing bulletproof vests and armor. Its low density, small mass, and high impact resistance can effectively reduce equipment weight while providing strong protective capabilities.

Avantages du produit
（1） High cost-effectiveness
The pressureless sintering process does not require high-pressure equipment, reduces production costs, and is suitable for large-scale production. This makes the price of silicon carbide ceramic plates more competitive in the market and able to meet the needs of more industries.
（2） Flexible in shape and size
The pressureless sintering process can produce complex shapes and large components. This provides greater flexibility for the design and manufacturing of products, meeting the personalized needs of different customers for product shape and size.
（3） High performance and long lifespan
The high hardness, wear resistance, high temperature resistance, and corrosion resistance of silicon carbide ceramic plates enable them to maintain stable performance under various harsh working conditions. This not only improves the operational efficiency of the equipment, but also significantly extends the product’s lifespan and reduces maintenance costs.

The pressureless sintered wear-resistant and high hardness silicon carbide ceramic plate has become an indispensable high-performance material in modern industry due to its excellent performance and wide application fields. Its high hardness, wear resistance, high temperature resistance, corrosion resistance, and good thermal conductivity make it show great potential for applications in various fields such as mechanical seals, high-temperature equipment, chemical metallurgy, semiconductor electronics, and bulletproof armor.