Applied high-temperature technology probram. II. Evaluation of coated columbium alloys for advanced turbine airfoils. Final technical report 1 Jun 1971--31 Jan 1975
Technical Report
·
OSTI ID:7142883
This report covers the niobium alloy evaluation. The objective of these evaluations was to determine the applicability of coated niobium alloys for advanced gas turbine vanes. The alloy SU-31 (Cb-17W-3.5 Hf-0.1C) was selected for evaluation following screening of wrought and cast alloys using the criteria of creep resistance at 2400/sup 0/F and fabricability. Hi Temp Co. R512E (Si-20Cr-20Fe) silicide coating was selected for this program. Mechanical and physical properties were determined and oxidation resistance was evaluated. Cast and wrought SU-31 vanes were fabricated and tested under simulated engine conditions. Based on the results of these evaluations, it was concluded that relatively poor cyclic oxidation and thermal fatigue properties are likely to prevent extended use of R512E coated SU-31.
- Research Organization:
- Pratt and Whitney Aircraft, East Hartford, Conn. (USA)
- OSTI ID:
- 7142883
- Report Number(s):
- AD-A-018638; PWA-5232-Vol-2
- Country of Publication:
- United States
- Language:
- English
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