Alstom Technology Limited

Abb Research Ltd.

Alstom

Christoph Toennes

Hans-Peter Bossmann

Maxim Konter

Marianne Sommer

Hans Joachim Schmutzler

Peter David Holmes

Mohamed Youssef Nazmy

Alexander Schnell

Dietrich Eckardt

Christoph Sommer

Klaus Erich Schneider

Joachim Roesler

In a heat treatment process for a single-crystal or directionally solidified material body comprising a nickel-based superalloy, the material body is solution-annealed and then at a first temperature &#x3b3;' particles of greater than 1 &#x3bc;m are precipitated in a proportion by volume with V&#x2212;Vof less than 50%, where Vis the total amount of &#x3b3;&#x2032; particles after complete heat treatment and Vis the proportion of the &#x3b3;&#x2032; particles which is greater than 1 &#x3bc;m, and at least at a second temperature '&#x3b3;' particles of less than 1 &#x3bc;m are precipitated. The &#x3b3;&#x2032; particles are preferably precipitated in a size of 2 pin or more with a proportion by volume of 0.25&#x3c;(V&#x2212;V)/(100&#x2212;V)&#x3c;0.55 at the first temperature. The proportion by volume Vof the &#x3b3;&#x2032; particles will be at least 50%.

Heat treatment method for bodies that comprise a nickel based superalloy

A high-temperature protection layer contains (% by weight) 23 to 27% Cr, 4 to 7% Al, 0.1 to 3% Si, 0.1 to 3% Ta, 0.2 to 2% Y, 0.001 to 0.01% B, 0.001 to 0.01% Mg and 0.001 to 0.01% Ca, remainder Ni and inevitable impurities. Optionally, the Al content is in a range from over 5 up to 6% by weight.

High-temperature protection layer

A coating composition for superalloy structural parts, especially, for gas turbine vanes and blades, which has high resistance to oxidation and corrosion and has excellent mechanical behavior. The coating preferably comprises: 18 to 28 wt % of Co; 11 to 15 wt % of Cr; 11.5 to 14 wt % of Al; 1 to 8 wt % of Re; 1 to 2.3 wt % of Si; 0.2 to 1.5 wt % of Ta; 0.2 to 1.5 wt % of Nb; 0.3 to 1.3 wt % of Y; 0 to 1.5 wt % of Mg; 0 to 0.5 wt % of a total of La and La-series; 0 to 0.1 wt % of B; less than 0.1 wt % of Hf; and less than 0.1 wt % of C. The balance of the coating is Ni. A total of Y, La, and La-series is from 0.3 to 2.0 wt %, and a total of Si and Ta is equal to or less than 2.5 wt %.

High temperature protective coating

The invention relates to a coating composition for superalloy structural parts, especially for gas turbine vanes and blades, which provides simultaneously excellent environmental resistance and highly improved thermomechanical behavior. The coating consists essentially of, by weight, 28-35% Co, 11-15% Cr, 10-13% Al, 0-1% Re, 1-2% Si, 0.2-1% Ta, 0.005-0.5% Y, 0-5% Ru, 0-1% Ca, 0-1% Mg, 0-0.5% La (or elements from the La series), 0-0.1% B, balance Ni and incidental impurities.

Coating composition for high temperature protection

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Brugg, Switzerland

Christoph Toennes