Dayoo Advanced Ceramic Co.,Ltd
Dayoo Advanced Ceramic Co.,Ltd
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High-Temperature Ceramic Nozzles With Rapid Temperature Adaptation For Extreme Operating Conditions
Manufactured from 99.5% high-purity silicon nitride (Si₃N₄) through specialized formulation design and gas pressure sintering technology, this product demonstrates exceptional thermal shock resistance. Capable of withstanding sudden temperature variations up to 1200°C without cracking, making it ideal for extreme operating conditions with rapid temperature fluctuations.
Aircraft engines: Fuel injection systems for combustion chambers
Steel metallurgy: Secondary cooling nozzles for continuous casters
Glass manufacturing: Annealing lehr jet systems for float glass
Chemical equipment: High-temperature reactor injection devices
Heat treatment furnaces: Rapid quenching cooling systems
✓ Exceptional ΔT resistance: Withstands 1200°C thermal shock
✓ Rapid temperature adaptation: Permits 20°C/s heating/cooling rates
✓ High-temperature stability: Maintains structural integrity at 1600°C
✓ Thermal fatigue resistance: >95% strength retention after 1000 cycles
✓ Quenching-proof: 100% pass rate in water quenching tests
| Parameter | Specification |
|---|---|
| Material Purity | Si₃N₄≥99.5% |
| Thermal Shock ΔT | 1200°C (water quenching test) |
| Flexural Strength | ≥650MPa (post-shock) |
| CTE | 3.1×10⁻⁶/°C |
| Thermal Conductivity | 25W/(m·K) |
| Maximum Service Temp | 1600°C |
| Thermal Cycles | >1000 (ΔT=1000°C) |
| Post-Shock Strength Retention | >95% |
Material optimization: Unique grain boundary phase design
Forming process: 200MPa isostatic pressing
Gas pressure sintering: 1850°C nitrogen atmosphere
Microstructure control: β-Si₃N₄ whisker toughening
Performance testing: Water quenching thermal shock test (1200°C⇄RT)
⚠️ Installation: Maintain 0.5-1mm thermal expansion gap
⚠️ Temperature control: Permits rapid heating (≤20°C/s)
⚠️ Cooling restrictions: Avoid localized forced cooling
⚠️ Maintenance: Inspect for thermal shock damage every 500 hours
Technical support: Free thermal stress analysis
Custom solutions: Special thermal shock condition designs
Emergency response: 12-hour technical support
Q: Maximum allowable temperature change rate?
A: Permits up to 20°C/s, recommended ≤15°C/s.
Q: Performance in oxidizing atmospheres?
A: Stable below 1200°C, recommended <1000°C for prolonged use.
Q: How to identify thermal shock damage?
A: Replace when surface cracks >0.1mm or flow variation >10% occurs.
