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Jiangsu Sunzo Spring Elasticity Technology Co., Ltd
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Inconel718 Bearing Disc Spring - High-temperature Resistant for Aerospace Bearing Preload
Aerospace high-temperature bearing systems—including aircraft turbine engines (e.g., CFM56, LEAP series), satellite reaction wheels, and rocket propulsion assemblies—operate under extreme thermal cycling (-270°C to 650°C), high vibration (10-2000Hz), and corrosive atmospheric conditions. Our Inconel718 Bearing Preload Disc Spring is engineered as a mission-critical elastic component to address these challenges.
Product Configurations
Grooved Series: For high-speed precision applications up to 15,000 RPM
Grooveless Series: For heavy-load static applications up to 800 kN
Precision: Annular geometry with tolerance class IT5 (±0.02mm on critical dimensions)
Key Performance Metrics
Parameter
Performance Specification
Thermal Stability
Sustains continuous operation at 650°C (peak 800°C); retains 80% tensile strength at 500°C, 70% at 650°C
Fatigue Resistance
Exceeds 10⁷ cycles at 40% ultimate strength; maintains stable preload force (±5% variation)
Load Multiplication
4-5x force output in parallel stacks (2-6 discs); uniform load distribution (±3% variance)
Material & Surface Engineering
Constructed from Inconel718 superalloy (Ni-52%, Cr-19%, Fe-18%, Nb-5%) with proprietary heat treatment cycle (solution annealing at 980°C + double aging at 720°C/620°C) to form γ" precipitates. Dacromet surface treatment (zinc-aluminum flake coating, 8-12μm thickness) provides superior oxidation resistance, passing 1500+ hours of neutral salt spray testing (ASTM B117).
Application-Specific Optimizations
Turbine Engine Bearings: Grooved series with 6 equidistant radial grooves reduces radial stress by 30% during high-speed rotation
Satellite Bearings: Grooveless design with shot-peened surfaces (HV 500-550) enhances resistance to micro-vibration-induced fatigue
Additional Technical Data Available: Preload force calibration data for specific engine models (e.g., GE9X) and thermal shock test results (1000 cycles between -200°C and 600°C).
