Hot gas-guided component of a turbomachine

Abstract

A hot-gas conducting component for a flow machine has a nickel-base wrought alloy as structural material and a hot gas-side lining made from the group of iron-chromium-aluminum-yttrium alloys and a flow machine having a component of this type.

Claims

1. A heat and oxidation resistant hot gas conducting component of a flow machine comprising: a solid-solution hardened nickel-base wrought alloy as structural material; and a hot gas-side lining applied directly on the structural material, said hot gas-side lining consisting of a ferritic, body-centered cubic iron-based iron-chromium-aluminum-yttrium-hafnium alloy, for direct hot gas conducting contact with the hot gas in the flow machine, and wherein said alloy of the hot gas-side lining consists of 16% to 24% w/w chromium, 3% to 9% w/w aluminum, 0.02% to 0.2% w/w yttrium, up to 0.1% w/w hafnium, balance consisting of iron, up to 0.1% w/w zirconium and up to 0.1% w/w of metals selected from the group of lanthanides; the hot gas conducting component being selected from the group consisting of combustion chamber linings, turbine inlet housings and hot gas ducts.

2. The hot gas conducting component according to claim 1, wherein said hot gas-side lining is applied directly by means of high-temperature soldering, welding, or cladding.

3. The hot gas conducting component according to claim 1, additionally comprising a cooling air-side coating applied to said structural material.

4. The hot gas conducting component according to claim 3, wherein said cooling air-side coating is an alloy selected from the group of MCrAlY alloys wherein M represents one or more of nickel, cobalt and iron.

5. A flow machine having a hot gas conducting component according to claim 1.

Description

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

(1) Preferred embodiments of the invention are described more fully in the following.

(2) According to the invention, a hot-gas conducting component of a flow machine, particularly a gas turbine, is constructed as a composite material comprising a solid-solution hardened nickel (Ni) base wrought alloy and an oxidation-resistant ferrific iron base alloy, particularly an FeCrAlY alloy. The Ni base wrought alloy forms the supporting construction and structural material of the component, and the FeCrAlY alloy is applied to the structural material as a hot gas-side lining. Within the meaning of the invention, hot gas side means that the lining is applied to an inner surface of the component facing the hot gases. In a corresponding manner, cooling air side within the meaning of the invention means a coating is arranged on an outer surface of the component facing the cooling air.

(3) For example, a hot-gas conducting component of a gas turbine is the Y-branch pipe which serves as a hot-gas guiding duct between the combustion chambers and the turbine blading and guides the hot gases from the combustion chamber to the first turbine stage. Other hot-gas conducting components are, for example, combustion chamber linings and turbine inlet housings.

(4) A preferred material from the group of FeCrAlY alloys is an aluminum-chromium-yttrium-hafnium alloy, abbreviated ALUCHROM-YHf alloy.

(5) Aside from the active element yttrium (Y) and hafnium (Hf), additional active elements such as, e.g., zirconium (Zr), can be mixed in with the FeCrAlY alloy to increase the cyclic oxidation resistance.

(6) An FeCrAlY alloy having iron (Fe) as base element and comprising 16% to 24% chromium (Cr), 3% to 9% aluminum (Al), 0.02% to 0.2% yttrium (Y), up to 0.1% hafnium (Hf), up to 0.1% zirconium (Zr), and up to 0.1% metals from the group of rare earths (RE) is particularly preferable. Lanthanides or lanthanoids (La), e.g., cerium (Ce), praseodymium (Pr), neodymium (Nd), and promethium (Pm), are mentioned in particular as examples from the group of rare earths.

(7) The FeCrAlY alloys are applied to the structural material by means of known methods of high-temperature soldering, welding, or cladding and roll bonding cladding. To prevent interdiffusion between the structural material and the lining, a diffusion barrier, e.g., based on the AlON system, can be used.

(8) The use of the FeCrAlY alloy as lining is not limited to the hot gas side of the components; rather, it is also contemplated to construct the hot-gas conducting component in a sandwich-type manner. In so doing, the structural material of solid-solution hardened Ni base wrought alloy constitutes the supporting structural core which is arranged between a hot gas-side lining and a cooling air-side coating based on the above-described FeCrAlY alloys.

(9) The disclosure relates to a hot-gas conducting component for a flow machine with a nickel base wrought alloy as structural material and a hot gas-side lining from the group of iron-chromium-aluminum-yttrium alloys and to a flow machine with a component of this type.

(10) The invention is not limited by the embodiments described above which are presented as examples only but can be modified in various ways within the scope of protection defined by the appended patent claims.