Ultra High Temperature Based Silicide Materials For Next
Transcript of Ultra High Temperature Based Silicide Materials For Next
Office National d’Étudeset de Recherches Aérospatiales
www.onera.fr
Dr. Stefan DRAWINONERA (French aerospace research centre)
Metallic Materials and Processing Department 92320 CHÂTILLON (France)
Ultra High Temperature Refractory Metal Based Ultra High Temperature Refractory Metal Based SilicideSilicide MaterialsMaterials
For Next Generation TurbinesFor Next Generation Turbines
Presentation OutlinePresentation Outline
• Introduction
• The project
• Alloy systems
Manufacturing
Mechanical properties
Oxidation resistance
Machining
• Conclusion
Introduction: increase engine performanceIntroduction: increase engine performance
• Environmental impact
efficiency (SFC, …)
emissions (CO2, NOx, …)
noise
• Reliability
• Costs
Long term goals (from ACARE):• 20% reduction in SFC • 80% reduction in NOx emissions• 50% reduction in CO2 emissions
(Rol
ls-R
oyce
)
Introduction: increase temperature capabilityof materials
Introduction: increase temperature capabilityof materials
• Increase thermal efficiency• Increase combustion temperature
(cfm
i)
through
• Advanced engine architectures
• Advanced cycle designs
• Novel combustor designs
• Optimised aerodynamics
• New cooling concepts
• Increased airfoil material temperature capability
+ 50°C in TIT ⇒ 4 – 5 % reduction in SFC
Introduction: increase temperature capabilityof materials
Introduction: increase temperature capabilityof materials
Introduction: what materials for turbine blades?Introduction: what materials for turbine blades?
Capabilities of turboengine materials, up to the most recent generation of single-crystal Ni-base superalloys
The ProjectThe Project
ULtra high Temperature MATerials for Turbines
• Develop Mo- and Nb silicide-based multiphase alloys• Develop cost-effective fabrication processes, based on PM or IM• Design coatings with improved oxidation resistance• Establish a database to benchmark against current materials, and
provide data for specific turbine operating conditions• Identify the critical material properties, processing requirements
and other factors (cost, etc.) governing production feasibility• Manufacture prototypes to validate machining and joining
processes• Carry out a preliminary assessment to introduce these materials in
high-performance turbines, and study implications for future component/turbine design
The projectThe project
ULtra high Temperature MATerials for Turbines
• Started: January 2004• Duration: 48 months
ONERA (coordinator) France
University of Magdeburg Germany PLANSEE SE Austria
IRC– Univ. of Birmingham UK Turbomeca France
University of Surrey UK University of Nancy France
Snecma France Walter Engines Czech Republic
Electricité de France France Rolls-Royce UK
Avio Italy
• 12 partners• 6 countries
Alloy systemsAlloy systems
Key properties
tensile creep (< 1% in 125 h at T > 1200 °C and σ > 175 MPa)tensile strengthRT toughnessoxidation resistance (∆e < 25 µm in 100 h at 1300°C)fatigue behaviour
andphase stability at T > 1300°Cdensity < 7.5 g.cm-3
processing at industrial scale
Replicate the properties of superalloys (∼1100°C)… at T ≥ 1300°C
Properties of alloys are governed by:
• composition
Alloy systemsAlloy systems
• microstructure
• various microstructures• various processing routes
• fast composition screening• small alloy batches