Dayoo Advanced Ceramic Co.,Ltd
Dayoo Advanced Ceramic Co.,Ltd
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Corrosion And High-Temperature Resistant Silicon Nitride Ceramics For Precision Applications
Product Overview
This product is an elongated structural component precision-machined from high-performance silicon nitride (Si₃N₄) ceramic. It exhibits the characteristic dark gray-black color of silicon nitride and features a symmetrical design with a flat, elongated main body and precisely positioned T-shaped protrusions at both ends and the center. This unique design ensures overall structural strength while providing accurate positioning and transmission functionality. The component fully leverages the superior properties of silicon nitride ceramic, including high hardness, exceptional wear resistance, corrosion resistance, and high-temperature stability, making it a core functional element designed for high-precision, high-load industrial applications.
Primary Applications
Thanks to its special structural design and excellent material properties, this component is primarily used in:
High-Precision Linear Guide Systems: Serving as ceramic sliders in precision machine tools and measuring equipment, enabling high-accuracy linear motion without lubrication when paired with guide rails.
Automation Drive Mechanisms: Acting as drive connecting elements in robotics and conveyor systems, withstanding alternating loads while maintaining long-term stability.
Semiconductor Process Equipment: Functioning as support rails for wafer carriers in diffusion furnaces and CVD equipment, offering high-temperature resistance and eliminating metallic contamination.
Special Machinery: Used as corrosion-resistant drive components in food, pharmaceutical, and other industries requiring hygienic conditions.
Key Advantages
Exceptional Mechanical Properties: Flexural strength ≥750 MPa, Vickers hardness ≥1400 HV, Elastic modulus 310 GPa.
Superior Wear Resistance: Wear rate <1×10⁻⁶ mm³/N·m, service life 8-10 times longer than bearing steel.
Excellent Thermal Stability: Long-term use temperature up to 1200°C, coefficient of thermal expansion 3.2×10⁻⁶/K (20-1000°C).
Stable Chemical Performance: Resistant to acid and alkali corrosion (except hydrofluoric acid), suitable for harsh operating environments.
Self-Lubricating Properties: Friction coefficient 0.15-0.25, capable of dry operation.
Lightweight Design: Density 3.2 g/cm³, approximately 60% lighter than steel components of the same specification.
Specifications Table
| Parameter | Technical Specification |
|---|---|
| Material Type | Hot-Pressed Sintered Silicon Nitride |
| Color | Dark Gray-Black |
| Density | 3.20 ± 0.05 g/cm³ |
| Flexural Strength | ≥750 MPa |
| Fracture Toughness | ≥6.2 MPa·m¹/² |
| Maximum Service Temperature | 1200°C (Inert Atmosphere) |
| Thermal Conductivity | 25-35 W/(m·K) |
| Dimensional Accuracy | IT5 Grade (±0.005 mm) |
| Surface Roughness | Ra ≤ 0.1 μm (mating surfaces) |
| Parallelism | ≤0.01 mm/100 mm |
Manufacturing Process
Raw material formulation (High-purity Si₃N₄ powder + MgO-Y₂O₃ sintering aids) → Ball milling and mixing → Spray drying → Bidirectional pressing → Sintering under protective atmosphere (1850°C) → CNC precision grinding → Laser dimensional inspection → Ultrasonic cleaning → Vacuum packaging → Final quality inspection.
Usage Instructions
Use specialized fixtures during installation to ensure proper engagement of the T-shaped protrusions with the corresponding grooves.
Recommended fit clearance: 0.01-0.03 mm (adjust based on operating temperature).
Avoid direct impact with hard tools to prevent chipping.
Regularly clean the guide rail mating surfaces; inspect for wear every 500 hours of operation.
After-Sales Service
24-month quality warranty.
Complimentary technical installation guidance.
Support for custom non-standard designs (Minimum order quantity: 20 pieces).
Customer usage records maintained with regular quality tracking.
Frequently Asked Questions (FAQ)
Q: What are the advantages compared to zirconia ceramics?
A: Silicon nitride offers a higher maximum service temperature (400°C higher) and superior thermal shock resistance, making it particularly suitable for environments with rapid temperature changes.
Q: What is the maximum allowable operating speed?
A: Up to 2 m/s under lubricated conditions; for dry operation, it is recommended to keep speed ≤0.5 m/s.
Q: Can surface modification treatments be applied?
A: Surface polishing (Ra ≤ 0.05 μm) or nitriding treatments are available to further reduce the friction coefficient.
