High-Strength Silicon Nitride Ceramic Dark Gray Hollow Cylinder / Sleeve

Product Introduction

This product is a hollow cylindrical structural component made from high-performance silicon nitride ceramic. It features a dark gray appearance with a mirror-level surface finish achieved through precision machining. The through-hole design creates a uniform structure with consistent inner and outer diameters, with wall thickness uniformity controlled within ±0.1mm. This special structure combines the inherent high hardness and wear resistance of ceramic materials with the advantages of lightweight design, making it suitable for high-precision industrial applications.

Core Advantages

• Exceptional wear life: Hardness exceeding HRA 90, wear rate only 1/10 of bearing steel

• Extreme temperature stability: Maintains dimensional stability from -60°C to 1200°C

• Self-lubricating properties: Friction coefficient ≤0.15, requiring no additional lubricants

• Corrosion resistance: Withstands strong acid and alkali environments (except hydrofluoric acid)

• Lightweight design: Density of 3.25g/cm³, 40% lighter than equivalent specifications of tungsten carbide

Primary Applications

• High-speed bearing components: CNC machine tool electric spindle bearings, aerospace precision bearings

• Fluid handling systems: Chemical pump mechanical seal rings, corrosion-resistant输送 sleeves

• Semiconductor equipment: Wafer transfer guides, vacuum processing chamber insulation columns

• Measuring instruments: CMM guide sleeves, optical platform support columns

• Thermal processing equipment: Sintering furnace carrier rollers, heat treatment equipment positioning sleeves

Specifications Table

Manufacturing Process

High-purity silicon powder nitridation → Spray granulation → Cold isostatic pressing (200MPa) → Atmosphere-protected sintering (1800°C) → CNC internal/external cylindrical grinding → Ultrasonic flaw detection → Laser dimensional verification → Vacuum anti-static packaging

Usage Instructions

1. Ensure clean mating surfaces during installation, recommend using thermal assembly process (heating temperature ≤200°C)

2. Allow 0.02-0.05mm thermal expansion gap when fitting with metal components

3. Avoid contact with hydrofluoric acid; use temperature in strong alkaline environments should be <80°C

4. Storage environment humidity should be controlled below 40% RH to prevent caking

After-Sales Service

• Provide material composition test reports

• Support custom non-standard dimensions (minimum inner diameter from 0.5mm)

• Provide service life guarantee agreements for bulk purchases

• Professional technical team offers working condition adaptation solutions

FAQ

Q: What are the advantages compared to zirconia ceramic sleeves?
A: Silicon nitride maintains high mechanical strength above 800°C, with lower thermal conductivity, making it more suitable for applications with rapid temperature changes

Q: Can secondary machining be performed?
A: Supports precision machining like laser drilling/diamond grinding, but must be done after sintering is complete

Q: What is the maximum available length specification?
A: Conventional specifications ≤500mm, special processes can produce 1200mm ultra-long sleeves