Composite composition for turbine blade tips, related articles, and methods

摘要

A composite composition that includes an MCrAlX alloy and a nano-oxide ceramic is disclosed. In the formula, M includes nickel, cobalt, iron, or a combination thereof, and X includes yttrium, hafnium, or a combination thereof, from about 0.001 percent to about 2 percent by weight of the alloy. The amount of the nano-oxide ceramic is greater than about 40 percent, by volume of the composition. A protective covering that includes the composite composition is also disclosed. The protective covering can be attached to a tip portion of a blade with a braze material. A method for joining a protective covering to a tip portion of a blade, and a method for repair of a blade, are also provided.

主权项

1. A protective covering comprising a composite composition bonded to a substrate with a braze material, wherein the composite composition comprises:
a MCrAlX alloy, wherein M comprises nickel, cobalt, iron, or combinations thereof, and X comprises, by weight of the alloy, from about 0.001 percent to about 2 percent yttrium, hafnium, or a combination thereof; a nano-oxide ceramic in a range from about 70 percent to about 90 percent by volume of the composite composition; and wherein the braze material comprises a nickel-based alloy having from about 1 percent to about 10 percent titanium by weight of the braze material.