Metallic cellular structure

An abradable seal for use in a gas turbine comprising a metal backplate and a honeycomb structure attached standing on edge to the metal backplate comprising a metal foil or sheet metal consisting essentially of 6 to 30% by weight Cr, 2 to 7% by weight Al, 0.005 to 0.6% by weight Y, up to 0.6% by weight of at least one of the elements selected from the group consisting of Zr, Hf, Ce, La, Si, Mn and Ti, 0 to 0.3% by weight C, at least 6% by weight Fe, and the balance, apart from impurities, being Fe or Ni or combinations thereof.

A method of forming an abradable seal for use in a gas turbine comprising forming a plurality of corrugated strips of a foil metal or sheet metal alloy consisting essentially of 6 to 30% by weight Cr, 2 to 7% by weight Al, 0.005 to 0.6% by weight Y, up to 0.6% by weight of at least one of the elements selected from the group consisting of Zr, Hf, Ce, La, Si, Mn and Ti, 0 to 0.3% by weight C, at least 6% by weight Fe, and the balance, apart from impurities, being Fe or Ni or combinations thereof, said strips each having alternating flat slanted sides interconnected by a flat crest, abutting the strips together at adjacent flat crests, welding the strips together at the adjacent flat crests to form generally hexagonal cells, the slanted sides having an equal length and the crests having a length greater than the slanted sides whereby the cell width w measured between opposed flat crests of adjacent strips relative to the distance b between the planes of opposed slanted sides has a ratio of b:w of greater than 1.15:1.0, and brazing the hexagonal structure standing on edge to a nickel-base backplate.