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mcralx-layers with different chromium and aluminum contents

A technology of chromium content and aluminum content, applied in the field of MCrAlX layer, can solve the problems of said layer failure, peeling and damage of thermal insulation coating

Inactive Publication Date: 2011-12-07
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the event of a further increase in the surface temperature of the protective layer, damage will result, leading to failure of said layer or peeling off of the thermal barrier coating

Method used

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  • mcralx-layers with different chromium and aluminum contents
  • mcralx-layers with different chromium and aluminum contents
  • mcralx-layers with different chromium and aluminum contents

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Experimental program
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Embodiment Construction

[0013] in the attached figure 1 The first embodiment is shown in . The component 1 , 120 , 130 , 155 has a substrate 4 . Especially for gas turbines 100 used at high temperatures ( image 3 ), said substrate 4 has in particular according to Figure 6 super alloy.

[0014] A metallic protective layer 13 is present on the substrate 4 .

[0015] According to the invention, the metallic protective layer 13 comprises two chemically different MCrAlX layers 7 , 10 , wherein the outer layer 10 preferably has a higher chromium content.

[0016] It is also preferred that the outer layer 10 has a higher aluminum content than the underlying layer 7 .

[0017] The difference (absolute value) in the chromium content of the two layers 7 , 10 is preferably at least 1% by weight (|Cr(7)−Cr(10)|≧1% by weight). The difference (absolute value) in the chromium content of the two layers 7, 10 is preferably at least 1% by weight (|Al(7)−Al(10)|≧1% by weight), more preferably at least 2% by wei...

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Abstract

In a coating system with a substrate and a 2-layer MCrAlX (chromium (Cr)-aluminum (Al) alloy) coating, the outer MCrAlX layer has (a) lower Cr content and higher Al content than the inner MCrAlX layer and / or (b) if X is at least partially yttrium (Y), lower Y content than the inner layer. M and X are not defined in the main claims; in the disclosure M is iron, cobalt and / or nickel and X is Y, silicon, rare earth metal(s) and / or hafnium; in a dependent claim X may also be rhenium.

Description

technical field [0001] The invention relates to an MCrAlX layer of two sublayers with different chromium and aluminum contents. Background technique [0002] Ni-based and Co-based materials are used in the hot gas circuit of gas turbines. However, due to the optimization of the maximum possible strength of said materials, they generally do not have sufficient oxidation and high temperature corrosion resistance in hot gases. Therefore, the material must be protected with a suitable protective coating before hot gas attack. In order to increase the turbine inlet temperature (Turbineneintrittstemperatur), components subjected to extremely high thermal stress are additionally coated with a ceramic layer made of zirconia for thermal insulation. The underlying metal layer acts as a bonding layer for the ceramic thermal insulation layer and as an anti-oxidation layer of the base material. [0003] In order to solve the problem, a protective coating is applied on the hottest comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C28/02
CPCC23C28/028C23C28/3455C23C28/00C23C28/023C23C28/3215C23C28/022C23C28/02C23C28/325C23C28/345Y02T50/67C23C28/021C23C28/321C23C28/36Y10T428/12764Y02T50/60
Inventor 弗里德黑尔姆·施米茨沃纳·斯塔姆
Owner SIEMENS AG
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