Ion-Plated Coating on Titanium Alloy.
Final rept. 1 Sep 78-1 May 79,
PRATT AND WHITNEY AIRCRAFT GROUP WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
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The trend to achieve higher thrust-to-weight ratios in advanced gas turbine engines has stimulated the need to develop structural components which are more oxidation resistant and possess improved mechanical properties. In an effort to meet these goals noble metals were ion-plated on Ti-6Al-2Sn-4Zr-6Mo compressor blades. These blades represent an excellent medium for evaluating ion-plating on titanium gas turbine components. The ion-plated coatings evaluated were Pt, PtRh and Au. Holograms were used to determine the effect of the coating on the normal frequency and mode shape. In addition, a combination of stress coat paint and strain gages were used to determine if the ion-plated coating alters the stress distribution. Fatigue and notch fatigue tests were run on coated and uncoated blades conditioned by heating at 454 C 850 F for 125 hr and then tested at 454 C 850 F. Unlike other methods of coating, the ion-plating caused an increase in the high temperature fatigue strength. The oxidation resistance of the ion-plated materials was also substantially increased. Author
- Metallurgy and Metallography
- Fabrication Metallurgy