Advanced Silicon Nitride Ceramics Ideal For Automotive And Gas Turbine Components In High-Temperature Environments

Product Overview
This product is a T-shaped structural component precision-machined from high-performance silicon nitride (Si₃N₄) ceramic material. It exhibits the characteristic dark gray-black color of silicon nitride ceramic and features a monolithic design with a regular rectangular base connected to a horizontally oriented hollow cylinder at the top, maintaining open ends on the cylinder. The overall structure is simple yet robust, achieving an optimal balance of functionality and structural strength. This component fully utilizes the superior properties of silicon nitride ceramic, including high temperature resistance, high strength, high hardness, and excellent wear resistance, making it a versatile structural element designed for demanding industrial environments.

Primary Applications
Leveraging its unique structural design and material properties, this component is primarily suitable for:

• Precision Machinery Guidance Systems: Serving as linear guide bushings in CNC machine tools and automated equipment, ensuring motion accuracy and wear resistance.

• High-Temperature Equipment Support Components: Acting as insulating support bushings in semiconductor manufacturing equipment and heat treatment furnaces, withstanding both high temperatures and mechanical loads.

• Special Fluid Handling Systems: Used as ceramic connectors in chemical pumps, valves, and specialized fluid transfer pipelines, offering corrosion resistance and contamination-free operation.

• Measuring Instrument Positioning Mechanisms: Functioning as precision datum points and rotational supports in coordinate measuring machines (CMM) and optical instruments.

Key Advantages

• Exceptional Mechanical Properties: Flexural strength ≥800 MPa, hardness HRA ≥93, fracture toughness ≥6.5 MPa·m¹/².

• Excellent Thermal Stability: Maximum service temperature up to 1380°C (in oxidizing atmosphere), with a low coefficient of thermal expansion (3.2 × 10⁻⁶/°C).

• Superior Wear Resistance: Wear volume is only 1/10th of that of high-grade alloy steel, increasing service life by 5-8 times.

• Outstanding Corrosion Resistance: Resists corrosion from most acids, alkalis, and salt solutions (except hydrofluoric acid).

• Self-Lubricating Properties: Friction coefficient of 0.1-0.3, enabling long-term use in oil-free lubrication conditions.

• Lightweight Design: Density of 3.2 g/cm³, approximately 60% lighter than steel, contributing to weight reduction and efficiency gains.

Specifications Table

Manufacturing Process
Raw material formulation (High-purity α-Si₃N₄ powder + rare earth oxides) → Spray drying → Isostatic pressing → CNC green machining → Gas pressure sintering (1850°C / 2 MPa) → Diamond grinding → CMM inspection → Ultrasonic cleaning → Laser marking → Vacuum packaging.

Usage Instructions

1. Ensure the base is fully seated against the mounting surface during installation. Use a torque wrench (recommended torque ≤25 N·m).

2. A recommended fit clearance of 0.02 - 0.05 mm with metal parts (adjust based on operating temperature).

3. Avoid direct contact with highly corrosive agents like hydrofluoric acid and hot phosphoric acid.

4. Periodically inspect mating surfaces for wear (recommended interval: 2000 hours).

After-Sales Service

• 36-month extended quality warranty.

• Professional technical team provides installation guidance.

• Supports small-batch customization (Minimum Order Quantity: 50 pieces).

• Establishes dedicated customer quality files with regular follow-ups.

Frequently Asked Questions (FAQ)
Q: What are the advantages compared to silicon carbide ceramics?
A: Silicon nitride offers higher fracture toughness (1.5 times that of SiC) and superior thermal shock resistance, making it more suitable for applications involving impact loads.

Q: What is the maximum radial load it can withstand?
A: Standard components can withstand radial loads ≥15 kN. Structural reinforcement designs are available based on application requirements.

Q: Can complex internal cavities be machined?
A: Customization of various complex internal cavities is supported. The minimum achievable inner diameter is φ2 mm (with an aspect ratio ≤ 8:1).