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Silicon Nitride (Si3N4) Sealing Pipes & Valves for Low-Pressure Die Casting
Engineered for extreme industrial environments, our high-performance silicon nitride ceramic sealing components deliver unmatched durability and reliability in aluminum processing applications. These materials offer superior thermal and mechanical properties, forming the foundation for innovative equipment like the L-shaped high thermal conductivity submerged heating appliance.
Why Silicon Nitride for Sealing Applications?
Unmatched Performance:
Optimal for Low-Pressure Die Casting: High density, strength, and exceptional thermal shock resistance (ΔT 400-500°C) make Si3N4 the premier choice for sealing tubes and valves.
Superior Wear Resistance: Outperforms aluminum titanate and alumina ceramics, ensuring long-term airtightness and reducing maintenance frequency.
Excellent High-Temperature Strength: Maintains structural integrity under frequent thermal cycling, ensuring prolonged service life.
Design & Installation Note: While silicon nitride offers exceptional strength, its ceramic nature requires careful handling. Avoid large mechanical shocks by ensuring proper design and installation of lifting and transmission equipment.
Technical Property Comparison: Silicon Nitride vs. Alternative Materials
Category
Property
Unit
99% Al₂O₃
S-SiC
ZrO₂
Si₃N₄
Physical
Density
g/cm³
3.9
3.1
6.0
3.2
Water Absorption
%
0
0.1
0
0.1
Physical
Sintering Temperature
°C
1700
2200
1500
1800
Mechanical
Hardness (HV)
HV
1700
2200
1300
1400
Flexural Strength
MPa
~343
~392
~882
~686
Compressive Strength
MPa
~2942
~1961
~1961
~2255
Thermal
Max Working Temperature
°C
1500
1600
1300
1400
Thermal Expansion Coefficient (0-1000°C)
10⁻⁶/°C
8.0
4.1 (0-500°C)
9.5
2.0 (0-500 °C)
5.2 (500-1000°C)
4.0 (500-1000 °C)
Thermal Shock Resistance
ΔT (°C)
200
250
300
400-500
Thermal Conductivity (25°C)
W/m*K
31
100
3
25
Thermal
Thermal Conductivity (300°C)
W/m*K
16
100
3
25
Electrical
Volume Resistivity (20°C)
Ω*cm
>10¹²
10⁶-10⁸
>10¹⁰
>10¹¹
Dielectric Strength
kV/mm
18
Semiconductor
9
17.7
Key Benefits for Your Operation:
Extended Component Lifespan: Reduced downtime and replacement costs.
Consistent Sealing Performance: Maintains airtight integrity under thermal stress.
Enhanced Process Reliability: Minimizes leaks and process interruptions in die casting.
Applications: Sealing pipes, valves, and bespoke components for low-pressure die casting machines, aluminum transfer systems, and high-temperature industrial fluid handling.
