Silicon Nitride Ceramics Unmatched Performance In High Temperature Environments

Product Overview
This product is manufactured from high-performance silicon nitride (Si₃N₄) ceramic material, featuring a dark gray cylindrical structure with a precision-polished surface that is dense and uniform. Designed as a hollow tube open at both ends, it is available in two standard specifications (short and long) with an internal surface smoothness of Ra ≤ 0.2 μm. Leveraging the exceptional physical properties of silicon nitride ceramic, this tube maintains stable mechanical performance under harsh conditions such as high temperatures, corrosion, and wear, making it an ideal basic component for precision industrial equipment.

Primary Applications

• Insulating bushings and protective sleeves in high-temperature bearing systems

• Guide roller components in semiconductor wafer handling equipment

• Corrosive medium transfer pipelines in chemical processes

• Protective focusing lens sleeves for laser cutting machines

• Insulating protective housings for high-temperature sensors

Key Advantages

• Flexural strength ≥ 600 MPa, hardness HRA 92-94

• Temperature resistance up to 1300°C (in oxidizing atmosphere), thermal shock resistance ΔT ≥ 800°C

• Wear resistance 5-8 times greater than alumina ceramic

• Resistant to acid and alkali corrosion (except hydrofluoric acid)

• Low coefficient of thermal expansion (3.2 × 10⁻⁶/K), excellent dimensional stability

• Insulation resistance > 10¹⁴ Ω·cm

Specifications Table

Manufacturing Process
Raw material formulation → Spray drying → Cold isostatic pressing (CIP) → CNC machining → Gas pressure sintering → Internal & external cylindrical grinding → Ultrasonic testing → End face finishing → Dimensional screening → Vacuum packaging.

Usage Instructions

1. Use specific expanding tools for installation; avoid direct impact.

2. Recommended interference fit with metal parts: 0.02-0.05 mm.

3. Vertical installation is recommended when conveying media containing particles.

4. Regularly inspect the inner wall for wear (recommended interval: 2000 hours).

After-Sales Service

• 24-month extended warranty.

• Custom non-standard sizes supported (solution provided within 3 business days).

• Installation guidance videos available.

• Dedicated customer quality files maintained.

Frequently Asked Questions (FAQ)
Q: What is the maximum pressure it can withstand?
A: Short specifications withstand pressure ≥ 80 MPa, long specifications ≥ 50 MPa (requires calculation based on specific dimensions).

Q: Can secondary machining be performed?
A: Internal wall polishing, end chamfering, and other finishing processes are supported (process requirements must be provided).

Q: What are the advantages compared to zirconia tubes?
A: Higher heat resistance (by 400°C) and thermal conductivity (3 times greater), making it more suitable for high-temperature heat dissipation scenarios.