Sintered silicon carbide (SSiC) ceramics offer excellent properties such as high hardness, wear resistance, and corrosion resistance. They are widely used in ceramic pump spindles and bushings, as well as industrial ceramic pressing targets. The following is a brief introduction:

SSiC Ceramic Pump Spindle and Bushing

Performance Advantages

High Wear Resistance: SSiC ceramics have a Mohs hardness exceeding 9.5 and a microhardness of 2500-3000 HV. Their wear resistance is dozens of times higher than that of ordinary steel pipes, effectively resisting erosion and wear from solid particles in the pump medium, significantly extending the service life of pump spindles and bushings.

Strong Corrosion Resistance: SiC ceramics exhibit excellent chemical stability. With the exception of hydrofluoric acid, they exhibit excellent corrosion resistance to most acidic and alkaline solutions, as well as halogen gases. They can operate for long periods in harsh chemical environments such as strong acids and bases, making them ideal for pumps pumping highly corrosive media. Excellent Thermal Performance: SSiC ceramics have a low coefficient of thermal expansion and high thermal conductivity, offering excellent resistance to thermal shock and maintaining stability in environments with rapid temperature fluctuations. They are not susceptible to cracking or spalling due to thermal stress and can operate stably over a temperature range of -50°C to 1600°C.

High-Precision Dimensions: Advanced ceramic precision machining processes ensure that SSiC ceramic pump shafts and bushings possess strict dimensional tolerances, excellent cylindricity and roundness, and low surface roughness, such as Ra<0.4μm, which is critical for sealing performance and reducing wear initiation points.

Applications: SSiC ceramic pump shafts and bushings are widely used in pumps conveying highly corrosive, high-temperature, and solid-particle-laden media in the chemical, environmental protection, and hydrometallurgical industries. Examples include high-purity process pumps for conveying high-purity strong acids, strong bases, and organic solvents in the chemical industry, and filter pumps and circulation pumps for conveying various strong acid and strong base electroplating solutions in the environmental protection and hydrometallurgical fields.

SSiC Industrial Ceramic Pressed Target

Performance Characteristics

High Purity: SSiC targets are typically manufactured from high-purity silicon carbide powder, ensuring excellent performance and stability while minimizing the impact of impurities on target performance.

High Density: By optimizing sintering processes, such as hot pressing and pressureless sintering, high-density SSiC targets can be achieved. This reduces porosity, improves strength, toughness, and thermal conductivity, and reduces potential gas release and corrosion during use, extending their service life.

Uniform Microstructure: A fine, uniform grain structure helps improve target density and performance uniformity, enhancing thermal conductivity and thermal shock resistance. High-quality SSiC targets should also have low grain boundary impurity content and stable grain boundary phases to reduce stress concentration and fracture at the grain boundaries. 

Preparation Method

Hot-pressing sintering: High-purity silicon carbide powder is uniformly mixed with an appropriate amount of sintering aid, placed in a mold, and heated to 1800-2200°C under vacuum or a protective atmosphere. Simultaneously, a pressure of 20-40 MPa is applied to bond the powder particles together under high temperature and pressure, forming a dense silicon carbide target. This method can produce high-density, fine-grained SSiC targets with superior mechanical and thermal properties, but the process is complex and expensive.

Pressureless sintering: Silicon carbide powder is uniformly mixed with an appropriate amount of sintering aid, placed in a mold, and placed in a sintering furnace. Under a protective atmosphere, the temperature is raised to 2000-2300°C, allowing the powder particles to gradually densify through mechanisms such as diffusion and sublimation-redeposition, forming the target. This method is simple to operate and suitable for large-scale production. It can produce targets of larger size and complex shapes, but the density and mechanical strength of the targets may be slightly lower than those produced by hot-pressing sintering. 

Applications: 

SSiC industrial ceramic pressed targets are primarily used in the electronics and semiconductor industries for manufacturing high-temperature MOSFETs, IGBTs, and other devices. They are also used in the aerospace industry for manufacturing high-temperature components for aircraft engines, structural materials for missiles and aerospace weapons, and protective materials. They also have applications in the nuclear and chemical industries.