High Quality Customizable Multi-Size Silicon Nitride Gaskets

Overview of Silicon Nitride Gasket

Silicon Nitride Gasket is a high-performance gasket made of silicon nitride ceramic. It has high strength, 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. At the same time, silicon nitride gasket also has good insulation and low thermal expansion coefficient, can be widely used in aerospace, electronics, machinery and other fields, and plays an important role in sealing, vibration damping, insulation and so on.

Features of Silicon Nitride Gasket

Silicon Nitride Gasket has the following significant features:

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: silicon nitride gasket has strong resistance to acid, alkali and other chemicals, does not easy to be corrode, can be used in harsh chemical environments, such as chemical, electroplating and other industries, can effectively extend the service life of the equipment.

Low friction coefficient: Silicon nitride gaskets have smooth surfaces and low friction coefficient, which can reduce friction loss and energy loss， which is commonly used in some mechanical parts with high requirements for friction performance.

Good insulation performance: Silicon Nitride gasket has excellent electrical insulation performance, can effectively isolate the current, prevent leakage, short circuits and other problems, and has a wide range of applications in the electronic, electrical and other fields to ensure the safe operation of equipment.

Specifications table of Silicon Nitride Gasket

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

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Applications of Silicon Nitride Gasket

Silicon Nitride Gasket is widely used in many fields due to its excellent performance:

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： In high-speed mechanical equipment, silicon nitride gaskets can be used between bearings, gears and other components; the use of its low coefficient of friction and high abrasion resistance can reduce friction loss, reduce noise, improve the efficiency of mechanical transmission, and at the same time to withstand a large load, to ensure that the long-term stability of the operation of mechanical equipment.

Chemical industry: Due to its excellent corrosion resistance, silicon nitride gasket can be used in chemical reaction kettles, pipeline connections and other parts; it can resist the erosion of various strong acids, alkalis and other chemical media, ensure the sealing and safety of the chemical equipment, and reduce the cost of equipment maintenance and replacement.

Company Profile

RBOSCHCO is a trusted global chemical material supplier & manufacturer with over 12 years of experience in providing super high-quality chemicals and Nanomaterials. The company exports to many countries, such as the USA, Canada, Europe, UAE, South Africa, Tanzania, Kenya, Egypt, Nigeria, Cameroon, Uganda, Turkey, Mexico, Azerbaijan, Belgium, Cyprus, Czech Republic, Brazil, Chile, Argentina, Dubai, Japan, Korea, Vietnam, Thailand, Malaysia, Indonesia, Australia, Germany, France, Italy, Portugal etc. As a leading nanotechnology development manufacturer, RBOSCHCO dominates the market. Our professional work team provides perfect solutions to help improve the efficiency of various industries, create value, and easily cope with various challenges. If you are interested, please send an email to sales1@rboschco.com

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 Gasket

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

High-temperature and high-pressure scenarios: aviation engine combustion chambers (gas seals above 1400℃), industrial kiln connectors. Strong corrosive environments: chemical reactor, 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 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: Before installation, make sure the contact surface is flat and free of scratches; it is recommended to use diamond tools to process roughness ≤ Ra0.8μm. : Fitting method: Adopt the heating installation method (preheat the gasket to 150℃ or above), utilize the thermal expansion and contraction to realize the over-interference fit, and avoid the damage of knocking. Tightening torque: Calculate the tightening torque according to the working load to avoid cracking the gasket due to overload (a torque wrench is recommended). Environmental adaptation: high temperature working conditions need to be reserved for thermal expansion gap, corrosive environments need to be matched with inert coatings (such as boron nitride) to enhance protection.

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

Regular life: In chemical or electronic scenes without severe vibration, the service life can reach 5-8 years; in harsh environments such as aircraft engines, about 2-3 years of overhaul and replacement are required. Maintenance points: regular inspection of the surface for micro-cracks (can be detected by ultrasonic flaws); minor cracks can be repaired by 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: If the equipment leakage, abnormal vibration or insulation degradation may be the gasket aging or damage, it needs to be promptly 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 the high purity of raw materials (>99.9%), the sintering process is complex (1800 ℃ above high temperature), and the unit price of about 5-10 times the metal gasket. Full-cycle cost: In corrosive or high-temperature scenarios, metal gaskets may be replaced annually, while silicon nitride gaskets can be used for more than 5 years, reducing the comprehensive maintenance cost by 60%-70%, which is especially suitable for long-term operation of critical equipment.

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

Customization capability: U-shaped, V-shaped and shaped sealing structures can be designed according to requirements, 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, weight reduction of more than 40%, suitable for aerospace and other lightweight scenarios.