Metal Matrix Composites for High Temperature Turbine Blades.
Final technical rept. 1 Feb 74-1 Feb 75,
TRW INC CLEVELAND OHIO
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Continued development and evaluation of fiber-reinforced FeCrAlY composites, intended for gas turbine engine application at temperatures above 2000F, is described in this report. Resistance of W-1ThO2FeCrAlY and Mo-TZMFeCrAlY composites to thermal cycling over the temperature ranges 85-2000F and 85-2200F was determined. The W-1ThO2-reinforced system sustained 1000 cycles at the higher peak temperature cycle without damage. Mo-TZMFeCrAlY composites sustained 1000 cycles of Tmax 2000F and 100 cycles Tmax 2200F without damage but failed in the 1000 cycle Tmax 2200F test. Times-to-rupture of over 300 hours at 2100F and 35 ksi were observed for W-1ThO2FeArCrAlY composites at the 40-45 volume percent reinforcement. On a specific strength density normalized basis, these data represent substantial strength improvements over current D.S. eutectic systems. Additionally, relatively low creep strains were observed for the WFeCrAlY system compared to other candidate materials.
- Laminates and Composite Materials