Continued development of abradable gas path seals. Final report, 25 Sep 1974--29 Aug 1975

Technical Report · Sat Nov 01 04:00:00 EST 1975

OSTI ID:7240517

Shiembob, L T

Major program objectives were the continued development of NiCrAlY feltmetal and honeycomb systems for knife edge seal applications in the 1144 to 1366 K temperature range, and to initiate abradable seal material evaluation for blade tip seal applications in the 1366 to 1589 K temperature range. Larger fiber size, higher density feltmetal showed greatly improved erosion resistance with a slight reduction in abradability compared to the baseline feltmetal. Pack aluminide coating of the honeycomb extended the oxidation resistance and slightly improved the abradability of this material. Evaluation through selected abradability, erosion and oxidation testing, and pertinent metallography led to selection of a plasma sprayed yttria stabilized zirconia (ZrO/sub 2/)/CoCrAlY layered system as the system with the most potential to meet the 1589 K requirement for blade tip seals. This system demonstrated structural integrity, erosion resistance, and some degree of abradability. (GRA)

• Research Organization: Pratt and Whitney Aircraft, East Hartford, Conn. (USA)
• OSTI ID: 7240517
• Report Number(s): N-76-11275; NASA-CR-134879; PWA-5314
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ABRASION
ALLOYS
ALUMINIUM ALLOYS
CHALCOGENIDES
CHROMIUM ALLOYS
COBALT ALLOYS
GAS TURBINES
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
SEALS
TRANSITION ELEMENT COMPOUNDS
TURBINE BLADES
TURBINES
TURBOMACHINERY
VERY HIGH TEMPERATURE
YTTRIUM ALLOYS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM ALLOYS