High Toughness Wear‑Resistant Silicon Nitride (Si₃N₄) Gasket Shim Spacer Washer
High-precision silicon nitride ceramic gasket and shim features high fracture toughness, extreme wear resistance, excellent thermal shock and high-temperature stability. It integrates low thermal expansion, superior acid and alkali corrosion resistance, as well as reliable electrical insulation. Custom thickness, outer diameter, inner diameter and ultra-flat surface finishing are available for precision spacing, sealing and wear-resistant isolation applications.
High Precision Silicon Nitride Washer
Our silicon nitride ceramic gaskets and shims are high-performance flat ceramic spacer components fabricated by gas-pressure sintering and ultra-precision surface grinding. Breaking the limitation of brittle ordinary ceramic gaskets, Si3N4 material achieves a perfect combination of high hardness and excellent toughness, effectively preventing chipping, cracking and deformation during long-term compression, friction and high-temperature cycling work.
Different from metal and plastic gaskets, silicon nitride ceramic spacers own ultra-low thermal expansion coefficient, maintaining stable flatness and dimensional accuracy under drastic temperature changes. They are immune to oxidation, lubricating oil erosion, and most acid & alkali corrosive media. With non-magnetic and excellent insulating properties, these ceramic gaskets solve the problems of metal short circuit, plastic aging and rubber failure in harsh working environments, greatly improving equipment stability and service life.
All our ceramic shims and gaskets undergo strict flatness calibration and precision lapping treatment, featuring smooth surface, uniform thickness and no burrs. We support fully customized non-standard sizes and special shapes according to customer drawings, including customized thickness, aperture, outer contour and tolerance grades, to meet diverse precision isolation, spacing, sealing and wear-resistant protection requirements.
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Si3N4 Ceramic Parts are a man made compound synthesized through several different chemical reaction methods. they are pressed and sintered by well developed methods to produce a ceramic with a unique set of outstanding properties. The material is dark gray to black in color and can be polished to a very smooth reflective surface, giving parts with a striking appearance.
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■ Superior High-temperature Stability
Supports continuous working temperature up to 1200°C and short-term extreme temperature resistance up to 1400°C. No softening, deformation or structural failure under long-term high-temperature service, far exceeding metal and ordinary ceramic tubes / pipes.
■ Excellent Thermal Shock Resistance
Outstanding resistance to rapid heating and cooling. The integrated dense sintered structure effectively resists temperature impact, avoiding cracking and peeling caused by thermal stress, greatly improving service life in cyclic temperature working conditions.
■ High Fracture Toughness & Structural Strength
Higher bending strength and impact toughness than traditional oxide ceramics. It is not easy to crack or break under vibration, pressure and mechanical impact, ensuring stable structural support and protection performance.
■ Excellent Corrosion & Erosion Resistance
Inert chemical property, resistant to most acids, alkalis, high-temperature flue gas and molten metal erosion. No chemical precipitation or pollution, suitable for high-purity production and harsh corrosive environments.
■ Good High-temperature Insulation & Low Expansion
Reliable electrical insulation performance at high temperature. Low thermal expansion coefficient ensures stable tube size and fitting accuracy during temperature changes, avoiding loose fitting and failure.
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Main Applications:
High-temperature furnace protection tubes, thermocouple insulating sleeves, metallurgical molten metal conveying and shielding tubes, semiconductor thermal processing equipment, new energy high-temperature modules, chemical anti-corrosion piping and industrial high-temperature insulating structural parts.
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Silicon Nitride Material Sheet
| Properties |
Units |
Silicone Nitride |
| Mechanical |
Density |
gm/cc |
3.2 |
| Porosity |
% |
0 |
| Flexural Strength |
Mpa |
830 |
| Compressive Strength |
Mpa |
2500 |
| Elastic Modulus |
Gpa |
310 |
| Poisson's Ratio |
/ |
0.27 |
| Hardness |
kg/mm2 |
1580 |
| Fracture Toughness KIC |
Mpa *m 1/2 |
6.1 |
| Thermal |
Heat Conductivity |
W/ m*k |
30 |
| Coefficient of Thermal Expansion |
10⁻⁶/K |
3.3 |
| Specific Heat |
j/kg*K |
/ |
| Thermal Shock Resistance |
°C |
/ |
| Max UseTemperature |
°C |
1400 |
| Electrical |
Dielectric Strength |
ac-kv/mm |
/ |
| Dielectric Constant |
/ |
8 |
| Loss Tangent |
/ |
/ |
| Volume Resistivity |
ohm•cm |
>1014 |
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Features:
● High Hardness
Silicon nitride exhibits extremely high hardness, making it suitable for fields such as wear-resistant and cutting tools.
● Excellent Wear Resistance
Silicon nitride ceramic exhibits outstanding wear resistance, making it suitable for applications in high-wear environments.
● Superior Insulating Performance
Silicon nitride ceramic possesses excellent electrical insulation properties and chemical stability, making it widely used in the electronics and semiconductor industries.
● High Temperature Stability
It can maintain stability in high-temperature environments, making it suitable for applications like high-temperature heaters and furnaces.
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Applications:
Rotating ball bearings and rollers bearings
Cutting tools
Engine components: valves, rocker arm pads, seal faces
Induction heating coil supports
Turbine blades, vanes, buckets
Welding and brazing jigs
Heating element components
Crucibles
Metal tube forming rolls and dies
TIG / Plasma welding nozzles
Weld positioners
Precision shafts and axles in high-wear environments
Thermocouple sheaths and tubes
Semiconductor process equipment
