Silicon Nitride Oxide High Hardness Machining Automotive Engines

Silicon Nitride Oxide High Hardness Machining Automotive Engines

Product Introduction

This product is a high-purity silicon carbide ceramic cylindrical sleeve manufactured using high-temperature sintering technology. The material is dense, exhibiting a characteristic dark gray-black color, and the surface is precision-polished to be smooth and pore-free with a fine texture. The product features a standard cylindrical structure with a highly coaxial through-hole and flat, ground end faces, ensuring stability and sealing during installation. This sleeve perfectly integrates the exceptional properties of silicon carbide ceramic, specifically designed for precision transmission systems requiring high wear resistance, corrosion resistance, and high-temperature stability.

Core Advantages

• Exceptional Wear Resistance: Extremely high hardness and superior wear resistance, significantly extending service life and reducing maintenance frequency and costs compared to metal bushings.

• Excellent Self-Lubrication: Performs outstandingly under dry or limited lubrication conditions, effectively preventing seizure and abnormal wear.

• Superior Corrosion Resistance: Resists erosion from most acids, alkalis, and solvents, making it suitable for harsh chemical environments.

• High-Temperature Stability: Maintains dimensional stability and mechanical strength in air at temperatures up to 1400°C without deformation.

• Low Thermal Expansion & High Thermal Conductivity: Low coefficient of thermal expansion ensures high dimensional accuracy; good thermal conductivity aids in dissipating frictional heat.

Primary Applications

Widely used in various precision machinery and demanding environments:

• Pump & Valve Systems: Used as mechanical seal rings, shaft sleeves, and bearings in centrifugal and chemical pumps for handling corrosive media.

• Automation Equipment: Serves as wear-resistant liners and support components in high-precision linear guides and rotary stages.

• Automotive Industry: Functions as wear-resistant and insulating components in turbochargers and high-temperature sensors.

• Metallurgy & Glass Industry: Employed as conveyor rollers and guide wheel sleeves in high-temperature kilns and furnaces.

• New Energy & Semiconductor: Acts as a critical wear part in photovoltaic wafer cutting machines and semiconductor processing equipment.

Specifications Table

Manufacturing Process

Silicon Carbide Fine Powder Preparation → Additive Mixing → Dry Pressing/Isostatic Pressing → High-Temperature Pressureless Sintering → Precision Grinding (ID/OD with Diamond Tools) → Surface Grinding (End Faces) → Non-Destructive Testing → Full Dimensional Inspection → Cleaning & Packaging.

Usage Instructions

1. Pre-Assembly: Ensure the mounting hole and shaft are clean and free of burrs. Surface treatment of mating metal parts is recommended to prevent galvanic corrosion.

2. Press-Fit Operation: Use a dedicated fixture during press-fit assembly to ensure even force distribution and avoid impact on one side, which could cause sleeve fracture.

3. Fit Design: A slight clearance fit with the shaft is recommended, accounting for the different thermal expansion coefficients of SiC and metal.

4. Lubrication Recommendation: While it has self-lubricating properties, appropriate lubrication can further enhance service life and operational smoothness.

After-Sales Service

We provide professional technical selection support and reliable after-sales service. The product comes with a 12-month warranty. We offer free replacement for failures due to material or manufacturing defects under normal use conditions. Lifetime technical consultation is available.

Frequently Asked Questions (FAQ)

Q: What are the advantages of this silicon carbide sleeve compared to a zirconia ceramic sleeve?
A: Silicon carbide surpasses zirconia in hardness, wear resistance, thermal conductivity, and high-temperature strength, offering significant advantages in applications requiring heat dissipation and high-temperature performance.

Q: What level of linear speed can this product withstand?
A: The specific linear speed depends on load, lubrication, and fit conditions. Under good operating conditions, it can reach 20 m/s or higher. Please consult our engineers for a detailed assessment.

Q: Can you customize non-standard sizes?
A: Yes. We support custom manufacturing and processing based on your provided drawings and specifications.

Q: Can it be used in strong alkaline environments?
A: Pressureless sintered silicon carbide has excellent resistance to strong alkalis and is suitable for long-term use in most strong alkaline environments.