Silicon Nitride Ceramics Superior Performance and Durability for High-Temperatur

Product Specification

Silicon Nitride Ceramics Superior Performance and Durability for High-Temperature and Corrosive Environments

Product Overview
This product is a composite structural component precision-manufactured from high-performance silicon nitride (Si₃N₄) ceramic. It exhibits the characteristic dark gray-black color of silicon nitride ceramic and features a unique asymmetric design. The left side consists of a truncated cone structure with precise stepped protrusions and a top circular hole, while the right side is an open-bowl structure with a specially treated inner wall exhibiting controlled roughness. This integrated design combines multiple functions such as positioning, transmission, sealing, and wear resistance. The component fully leverages the core advantages of silicon nitride ceramic, including high strength, high hardness, exceptional wear resistance, and excellent thermal stability, making it a highly reliable industrial element designed for extreme operating conditions.

Primary Applications
Thanks to its unique structural design and material properties, this component is ideal for:

• Mechanical Sealing Systems: Functions as a combination of rotating and stationary rings in tandem mechanical seals, where the stepped structure enables positioning and transmission, and the bowl structure forms the sealing face. Suitable for high-speed and highly corrosive conditions.

• Wear-Resistant Bushings and Sleeves: Used in bearing positions or as sleeves in pumps, mixers, etc., with the bowl opening serving as a wear-resistant lining to protect metal housings.

• Special Fluid Components: Acts as a ceramic cylinder liner in metering pumps or valve assemblies, where the rough inner wall aids fluid mixing or reduces cavitation.

• Automation Equipment Fixtures: Serves as high-precision fixtures or positioning modules utilizing its stepped positioning and wear-resistant properties.

Key Advantages

• Excellent Comprehensive Mechanical Properties: Combines ultra-high hardness (HRA ≥92) with high flexural strength and good fracture toughness, offering far superior impact resistance compared to ordinary ceramics.

• Outstanding Wear and Corrosion Resistance: Extremely long service life and resistance to most acids and alkalis, significantly extending equipment maintenance intervals.

• Superior Thermal Stability and Thermal Shock Resistance: Low thermal expansion coefficient and high thermal conductivity enable it to withstand severe thermal cycling without cracking, maintaining dimensional stability at high temperatures.

• Lightweight and Self-Lubricating: Significantly lower density than steel allows for lightweight designs. Low friction coefficient ensures smooth operation, even under limited lubrication.

• Insulating and Non-Magnetic: Excellent electrical insulator and non-magnetic, suitable for sensitive environments.

Specifications Table

Manufacturing Process
Raw material preparation (high-purity Si₃N₄ powder + sintering aids) → Uniform mixing → Near-net-shape forming (pressing/CIP) → Green body CNC machining (pre-forming steps and cavities) → High-temperature sintering (reaction sintering/gas pressure sintering) → Precision diamond grinding (OD, steps, faces) → Inner wall roughness treatment → Comprehensive quality inspection (dimensions, NDT) → Packaging.

Usage Instructions

1. Precise Installation and Alignment: As a sealing or rotating component, ensure exact alignment with mating parts to avoid premature failure due to localized stress from misalignment.

2. Correct Force Application: During installation, apply force to high-strength areas (e.g., step shoulders), avoiding improper bending stress on thin-walled or cantilevered sections.

3. Cleaning and Inspection: Ensure components and mating surfaces are clean before installation, and check for minor damage caused during transportation.

After-Sales Service
We offer a 12-month product quality warranty, supported by professional technical assistance and custom services. Non-standard design and manufacturing are available based on customer drawings to meet specific application requirements.

FAQ

• Q: Why is the inner wall of the bowl structure designed to be rough?
  A: The rough inner wall is typically a functional design. In sealing applications, it improves lubricant retention; in wear-resistant bushings, it enhances bonding with potting polymers or substrates; in fluid components, it disrupts flow fields to improve mixing.

• Q: What are the advantages of silicon nitride components over silicon carbide?
  A: The main advantages are higher fracture toughness and superior thermal shock resistance. Silicon nitride offers better resistance to mechanical impact and thermal stress failure, ensuring higher reliability in dynamic conditions with vibration or rapid temperature changes. Silicon carbide is harder but more brittle.

• Q: Can such a complex structure guarantee strength?
  A: Yes. Through advanced sintering processes and precision green body machining, material density is ensured, and stress concentration is avoided via designs like rounded transitions. The inherent high strength of silicon nitride meets the mechanical demands of complex structures.