It has highstrength, high hardness, high-temperature resistance, corrosion resistance, wear resistance and other excellent performance, and can maintain stable mechanical properties and dimensional accuracy under extreme conditions. Additionally, they offer good insulation and a low thermal expansion coefficient, making them suitable for applications in aerospace, electronics, machinery, and other fields where sealing, vibration damping, and insulation are critical.

Silicon Nitride Gaskets

Features of Silicon Nitride Gaskets

Strength and high hardness: Silicon nitride has high strength and hardness so that the gasket made of it can withstand greater pressure and impact, is not easy to deform and damage, and can maintain stable performance under high-load working conditions.

High-temperature resistance: silicon nitride gasket can maintain good stability in high-temperature environments, can withstand higher temperatures without softening or melting, its melting point is as high as 1900 ℃ or so, can be adapted to a variety of high-temperature conditions, such as aviation engines, metallurgy and other high-temperature areas.

Excellent Corrosion Resistance: They resist corrosion from acids, alkalis, and other chemicals, extending equipment life in harsh chemical environments such as those found in chemical and electroplating industries.

Low Friction Coefficient: Smooth surfaces and a low friction coefficient reduce friction and energy loss, making them suitable for mechanical parts requiring low friction.

Good Insulation Performance: Excellent electrical insulation properties prevent current leakage and short circuits, ensuring safe operation in electronic and electrical applications.

Specifications Table of Silicon Nitride Gaskets

Property	Unit	Typical Value
Density	g/cm³	3.21
Compressive strength	MPa	3000
Flexural strength	MPa	800
Fracture toughness	MPa·m¹/²	6.5
Young's modulus	GPa	320
Poisson's ratio	-	0.28
Hardness (Vickers, HV1)	GPa	16
Maximum temperature in inert gas	℃	1200
Maximum temperature in air	℃	1100
Thermal conductivity at 20℃	W/m·K	28
Thermal conductivity at 1000℃	W/m·K	16
Thermal expansion coefficient (20 - 100℃)	10⁻⁶/K	2
Thermal expansion coefficient (20 - 1000℃)	10⁻⁶/K	3.5
Resistivity at 20℃	Ω·cm	10¹²
Resistivity at 800℃	Ω·cm	10⁷
Dielectric constant	1 MHz	6

Applications of Silicon Nitride Gaskets

Aerospace field: Aero-engine will produce high temperature, high pressure and other extreme conditions when working; Silicon Nitride Gasket can play the role of sealing, vibration damping and heat insulation in the key parts of the engine by virtue of its high strength, high-temperature resistance and good abrasion resistance, which ensures the high efficiency and stable operation of the engine, and at the same time reduces the weight of the parts.

Electronic industry: the good insulation properties of silicon nitride gaskets make them ideal insulating materials for electronic equipment, and they can be used in chip packaging, circuit board connections and other parts, which can effectively prevent circuit short circuits. In addition, its high thermal conductivity contributes to rapid heat dissipation, ensuring that electronic components work within the normal temperature range and prolonging the service life of the components.

Mechanical Manufacturing Field: Used between bearings and gears in high-speed machinery to reduce friction loss, noise, and improve transmission efficiency.

Chemical Industry: Employed in chemical reactors and pipeline connections to resist corrosion from strong acids and alkalis, ensuring equipment sealing and safety.

Company Profile

Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and nanomaterials, including boride powder, nitride powder, graphite powder, ceramic products, 3D printing powder, etc.

The company has a professional technical department and Quality Supervision Department, a well-equipped laboratory, and equipped with advanced testing equipment and after-sales customer service center.

If you are looking for high-quality Ceramic Products please feel free to contact us or click on the needed products to send an inquiry.

Applications of Ceramic Products

Process of Ceramic Products

Payment Term
T/T, Western Union, Paypal, Credit Card etc.

Shipment Term
By air, by sea, by express, as customers request.

5 FAQs of Silicon Nitride Gaskets

Q1: What extreme environments are silicon nitride gaskets used in?

High-Temperature and High-Pressure Scenarios: Aviation engine combustion chambers (gas seals above 1400°C), industrial kiln connectors.

Strong Corrosive Environments: Chemical reactors, acid and alkali pipeline seals, replacing corrosion-prone metal or rubber gaskets.

High Insulation Scene: Semiconductor chip packaging, circuit board insulation isolation to prevent leakage and impurity pollution.

High-Speed and High-Load Machinery: Bearings, gearbox seals, utilizing a low coefficient of friction (0.02-0.08) to reduce wear and enhance transmission efficiency.

Q2: How to install silicon nitride gaskets? What do I need to pay attention to?

Surface Treatment: Ensure the contact surface is flat and free of scratches; use diamond tools to process roughness ≤ Ra0.8μm.

Fitting Method: Use the heating installation method (preheat the gasket to 150°C or above) to achieve an over-interference fit, avoiding damage from knocking.

Tightening Torque: Calculate the tightening torque based on the working load to avoid overloading and cracking the gasket (use a torque wrench).

Environmental Adaptation: Reserve thermal expansion gaps in high-temperature conditions and use inert coatings (e.g., boron nitride) in corrosive environments for enhanced protection.

Q3: What is the service life of silicon nitride gaskets? How to maintain?

Regular Life: 5-8 years in chemical or electronic environments without severe vibration; 2-3 years in harsh environments like aircraft engines.

Maintenance Points: Regularly inspect the surface for micro-cracks (detectable by ultrasonic flaw detection); minor cracks can be repaired using hot isostatic pressing (HIP) technology to restore 90% of the strength; avoid contact with molten metal or strong oxidizing media to prevent grain boundary corrosion.

Failure Warning: Equipment leakage, abnormal vibration, or insulation degradation may indicate gasket aging or damage, requiring prompt troubleshooting and replacement.

Q4: What is the cost of silicon nitride gaskets compared to traditional gaskets, such as metal and rubber?

Initial Cost: Due to high-purity raw materials (>99.9%) and complex sintering processes (above 1800°C), the unit price is about 5-10 times that of metal gaskets.

Full-Cycle Cost: In corrosive or high-temperature scenarios, metal gaskets may need annual replacement, while silicon nitride gaskets can last over 5 years, reducing comprehensive maintenance costs by 60%-70%, making them ideal for critical equipment with long-term operation.

Q5: Do silicon nitride gaskets support customized designs? What are the processing techniques?

Customization Capability: U-shaped, V-shaped, and custom-shaped sealing structures can be designed with a minimum thickness of 0.1mm and a maximum diameter of 500mm.Processing Technology:Near-Net-Shape: Reaction sintering (RSN) is suitable for complex shapes with <10% machining allowance.High-Precision Machining: Grinding, laser cutting (accuracy ±0.01mm) to meet the needs of semiconductors and other high-precision fields.3D Printing: Supports topology-optimized design, achieving over 40% weight reduction, suitable for aerospace and other lightweight scenarios.