Silicon Nitride Double Crescent Disc - High-Precision Symmetrical Special Ceramic Component

Silicon Nitride Double Crescent Disc - High-Precision Symmetrical Special Ceramic Component

Product Overview

This product is a silicon nitride double crescent disc manufactured using isostatic pressing technology. It features an elegant dark gray color with optically-level flatness achieved through double-sided grinding. The product adopts a unique symmetrical crescent design, with two disc structures in perfect mirror symmetry, and all edges feature rounded corners to ensure no stress concentration. This precision structural design ensures optimal stress distribution and installation stability while maintaining functionality.

Primary Applications

• Precision Sealing: High-temperature and high-pressure equipment sealing gaskets, vacuum chamber sealing components
• Optical Instruments: Laser equipment shading discs, optical system aperture components
• Mechanical Engineering: Precision bearing spacers, transmission system wear-resistant shims
• Semiconductor Manufacturing: Wafer handling fixtures, etching equipment insulation discs
• Medical Devices: High-precision instrument isolation discs, testing equipment insulation components

Product Advantages

→ Excellent Flatness: Flatness ≤0.005mm, parallelism ≤0.008mm
→ Ultra-high Hardness: Vickers hardness ≥1550HV, wear resistance 10 times better than alloy steel
→ Outstanding Temperature Resistance: Continuous operating temperature -196℃～1300℃
→ Zero Permeability: Density ≥99.5%, completely airtight
→ Chemical Inertness: Resistant to acid and alkali corrosion, suitable for various chemical media

Technical Specifications

Manufacturing Process

Nanoscale powder pretreatment → Isostatic pressing → Vacuum sintering → Surface rough grinding → Double-sided fine grinding → Profile cutting → Corner polishing → Ultrasonic cleaning → Dimensional inspection → Vacuum packaging

Usage Guidelines

1. Keep mounting surfaces clean during installation to avoid particle damage

2. Recommend using specialized installation fixtures to ensure symmetrical mounting

3. Preload force not exceeding 25N·m for sealing applications

4. Regularly inspect surface condition, recommended every 1000 operating hours

5. Avoid prolonged use in fluorine-containing media environments

Service Commitment

• 18-month quality assurance
• Complimentary installation technical guidance
• Support for small-batch custom production
• Provision of material certification reports
• Lifetime free technical consultation

Frequently Asked Questions

Q: What is the special function of the crescent design?
A: The crescent design ensures effective sealing area while providing compensation space for thermal expansion

Q: What is the dimensional accuracy of the product?
A: Thickness tolerance controlled within ±0.002mm, profile tolerance ≤0.01mm

Q: Is it suitable for ultra-high vacuum environments?
A: Outgassing rate <10⁻¹¹Pa·m³/s, particularly suitable for ultra-high vacuum applications

Q: What is the maximum processable size?
A: Currently maximum processable crescent disc structure with diameter of 200mm

Technical Innovation:
Utilizes unique symmetrical stress balance design to maintain dimensional stability during temperature changes. Special grinding processes achieve nanoscale surface roughness, ensuring perfect sealing effect. The material undergoes optimized sintering process with uniform grain size controlled within 0.8μm, maintaining high hardness while providing good fracture toughness.