High Toughness Self Lubrication Silicon Nitride Si3N4 Labyrinth Disc For Precision Machinery

High Toughness Self Lubrication Silicon Nitride Si3N4 Labyrinth Disc For Precision Machinery

Introduction:

Our silicon nitride (Si₃N₄) labyrinth discs are high-performance advanced ceramic components professionally engineered for precision sealing, isolation and anti-wear applications. Adopting high-purity silicon nitride raw materials and hot-press sintering technology, this product integrates ultra-high toughness, outstanding wear resistance and superior thermal stability, far exceeding traditional metal and alumina ceramic parts in harsh working conditions.

Featuring unique labyrinth groove structure with precise dimensional tolerance and smooth surface finish, the disc achieves excellent labyrinth sealing and isolation effects, effectively blocking medium leakage and particle penetration. Silicon nitride material delivers remarkable self-lubricating property, low friction coefficient and anti-cold welding performance, which avoids shaft locking and abrasion during high-speed operation. It maintains stable structural integrity under extreme temperature cycling, high pressure and long-term continuous friction.

With low density, high mechanical strength and excellent thermal shock resistance, the product resists cracking under rapid temperature changes from ultra-low temperature to 1200°C high temperature. It is also inert to most acids, alkalis and corrosive media, with long service life and low maintenance cost. Customized groove depth, spacing, disc size and precision machining are available according to customer drawings. Widely applied in high-speed bearings, mechanical sealing systems, new energy equipment, aerospace and industrial precision machinery fields.

Silicon nitride distinguishes itself from metal and other technical ceramics with a balanced set of mechanical, thermal and chemical properties.

1. High hardness & excellent wear resistance
With Vickers hardness above 1500 HV, silicon nitride resists erosion from sharp abrasive powders. Service life is multiple times longer than stainless‑steel counterparts, lowering part‑replacement frequency and production downtime.
2. High fracture toughness & high‑speed reliability
Si₃N₄ features fracture toughness ≥6.0 MPa·m¹/². Unlike brittle alumina ceramic, it tolerates particle impact and mechanical shock. Low density (3.2 g/cm³, roughly 2/3 of steel weight) reduces rotary inertia. The wheel runs stably at speeds above 10 000 rpm with lower bearing load, supporting higher limit rotating speed and finer classification capacity.
3. Superior thermal‑shock resistance
Low thermal‑expansion coefficient enables outstanding thermal‑shock performance. It withstands sharp temperature fluctuations during continuous powder processing without cracking, ideal for processes with hot‑powder feeding or periodic temperature cycling.
4. Chemical inertness and zero‑metal contamination
Silicon nitride is chemically stable against most acids, alkalis and organic media. No metallic debris will contaminate processed powder. This property is critical for battery‑material, pharmaceutical, high‑purity mineral and ceramic‑powder manufacturing where impurity must be strictly controlledloongceram....
5. Precision manufacturability
Integrated one‑piece sintered structure eliminates assembled‑blade loosening risk. Slots, shaft bore and dynamic‑balance holes can be machined to tight dimensional tolerances for precise aerodynamic profile and qualified dynamic balance.

Silicon Nitride Material Sheet