Abstract:
An oxidation resistant component (1) is disclosed comprising a substrate (4) and a protective layer (17). The protective layer (17) consists of an inner MCrAlY layer (16) contiguous with the substrate and an outer layer (19) consisting at least of Ni and Al and having a β-NiAl structure.
Abstract:
Wärmedämmschicht nach dem Stand der Technik auf der Basis von Zirkonoxid versintern bei hohen Temperaturen und verlieren dabei ihre Dehnungstoleranz.Eine erfindungsgemäße Wärmedämmschicht auf der Basis von Zirkonoxid weist Beimischungen auf, die die sich reduzierende Dehnungstoleranz des Zirkonoxids kompensieren.
Abstract:
The invention relates to a product (1), especially a gas turbine blade (1), having a metallic base (2) on which a protective layer (3, 4) is bonded for protecting against corrosion. The protective layer (3, 4) comprises an inner layer (3) made of a first MCrAlY alloy and of an outer layer (4) which is made of a second MCrAlY alloy and which is bonded on said inner layer (3). The second MCrAlY alloy is mainly present in the gamma -phase. The invention also relates to a method for producing a protective layer (3, 4), whereby the outer layer (4) is produced by remelting an area of the inner layer (3) or by depositing an MCrAlY alloy in a liquid phase.
Abstract:
A bond coating having high corrosion and oxidation resistance and good compatibility with a thermal barrier coating is disclosed. The bond coating may be an optimized NiCrAlY material with additional materials that eliminates the presence of beta phase for oxidation by replacing the beta phase with a gamma/gamma prime system. The bond coating may also decrease the presence of phases that are detrimental to the mechanical and oxidation properties of the system, such as the sigma and BCC chromium phases. The bond coating may also have a gamma/gamma prime transition temperature that is about 400 degrees Celsius higher than conventional bond coatings, which enables local stresses to be reduced.
Abstract:
Known protective coatings having a high Cr content, as well as silicon, have brittle phases that become additionally brittle under the influence of carbon during use. The protective coating according to the invention has the composition of 24% to 26% cobalt (Co), 10% to 12% aluminum (Al), 0.2% to 0.5% yttrium (Y), 12% to 14% chromium (Cr), and the remainder nickel.
Abstract:
Bekannte Schutzschichten mit hohem Cr-Gehalt und zusätzlich Silizium bilden Sprödphasen aus, die unter dem Einfluss von Kohlenstoff während des Einsatzes zusätzlich verspröden. Die erfindungsgemässe Schutzschicht hat die Zusammensetzung 24% bis 26% Kobalt (Co), 10% bis 12% Aluminium (AI), 0,2% bis 0,5% Yttrium (Y), 12% - 14% Chrom (Cr), 0.3% - 5.0% Tantal (Ta), Nickel (Ni).
Abstract:
Wärmedämmende Schichtsysteme müssen neben einer guten wärmedämmenden Eigenschaft auch eine lange Lebensdauer der wärmedämmenden Schicht aufweisen. Das erfindungsgemäße Schichtsystem (1) besteht aus einer speziell aufeinander abgestimmten Schichtfolge von metallischer Anbindungsschicht (7), innerer keramischer Schicht (10) und äußerer keramischen Schicht (13).