Products Description

Silicon carbide sleeves are tubular or annular mechanical components made from the high-performance engineering ceramic material-silicon carbide (SiC). They are typically manufactured through processes such as reaction bonding, pressureless sintering, or hot pressing, resulting in a dense and uniform microstructure. Due to their comprehensive excellent properties, silicon carbide sleeves are widely used in extreme or harsh industrial environments as critical liners, bushings, bearings, or protective sleeves. They provide equipment protection, reduce friction, and withstand severe media and temperatures.Its purity is typically also required to reach 3N-4N (99.9%-99.99%) levels to minimize impurity release at high temperatures.

Silicon Carbide Sleeves

Key Properties

Exceptional Wear Resistance: Extremely high hardness (Mohs hardness approximately 9.2–9.6, second only to diamond and cubic boron nitride), effectively resisting particle abrasion and sliding wear. Service life far exceeds that of metals and most other ceramic materials.
Outstanding Corrosion Resistance: Resistant to erosion by most strong acids (such as hydrochloric acid, sulfuric acid, nitric acid), strong alkalis, salt solutions, and molten salts, offering excellent chemical stability.
Excellent High-Temperature Performance: Maintains high strength and hardness at elevated temperatures. Long-term use temperature can reach up to 1450°C (in air). It has a low coefficient of thermal expansion and good thermal shock resistance, capable of withstanding rapid temperature changes.
High Mechanical Strength and Stiffness: Possesses very high compressive strength and elastic modulus, ensuring structural stability and minimal deformation.
Good Self-Lubricating Properties: Relatively low coefficient of friction, allowing for operation without or with reduced lubrication in some working conditions, making it especially suitable for oil-free or dry environments.
Low Density and High Thermal Conductivity: Density is much lower than that of heavy metal alloys, contributing to equipment weight reduction. It also has good thermal conductivity, facilitating heat dissipation.

Key Parameters

Material Type: Commonly classified as reaction-bonded silicon carbide (RBSiC) or pressureless sintered silicon carbide (SSiC). SSiC generally offers higher purity and performance.
Density: Approximately 3.02 – 3.20 g/cm³.
Hardness: HRA 88-94 or HV 2200-2800.
Flexural Strength: 300 – 550 MPa.
Compressive Strength: Above 2000 MPa.
Elastic Modulus: 380 – 420 GPa.
Coefficient of Thermal Expansion: (4.0 – 4.5) × 10⁻⁶ /K (room temperature to 1000°C).
Thermal Conductivity: 80 – 150 W/(m·K) (depending on temperature and sintering process).
Maximum Service Temperature: Can exceed 1600°C in inert or reducing atmospheres; typically below 1450°C for long-term use in oxidizing atmospheres.
Main Specifications: Inner diameter, outer diameter, and length can be customized according to drawings. Common inner diameter ranges from a few millimeters to several hundred millimeters.

ceramicstimes performance parameter

Primary Applications

Based on its properties, silicon carbide sleeves are widely used in the following fields:

High-Temperature Furnaces and Heat Treatment Equipment: Used as furnace rollers, guide rails, burner sleeves, thermocouple protection tubes, etc., in industries such as metallurgy, ceramic sintering, and glass processing.
Chemical and Petrochemical Industry: Used for mechanical seal rings and shaft sleeves in pumps, valves, and reactors, conveying corrosive media while withstanding wear and chemical erosion.
Machinery and Equipment Manufacturing: Used as bearings and bushings under high-temperature, high-speed, and oil-free lubrication conditions, for example, in high-end pumps, compressors, and mixing equipment.
Semiconductor Manufacturing: Used as supports and connectors for carriers (boats) in wafer heat treatment processes (diffusion, CVD), meeting requirements for high purity, high temperature resistance, and thermal shock resistance.
New Energy and Environmental Protection: Used for hot zone components in polysilicon casting furnaces, wear- and corrosion-resistant internal parts in flue gas desulfurization pumps, and key wear parts in solid waste treatment equipment.
Scientific Research: Used as support and connection components in laboratory high-temperature experimental setups, vacuum, or special atmosphere furnaces.

quality control

In strict adherence to the ISO 9001 Quality Management System, we implement full-process quality control to ensure the consistent delivery of high-quality products:

• 100% inspection of raw materials, guaranteeing quality from the source
• Utilization of advanced hot-pressing production lines for stable and reliable processes
• A comprehensive in-house testing system covering density, hardness, and microstructure analysis
• Availability of third-party authoritative certifications (including SGS, CE, ROHS, etc., provided upon request)

We remain committed to continuous improvement of our management system, providing customers with consistent and reliable product assurance.

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