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Interface stability control method for heat-and-corrosion-resistant single-crystal alloy combustion engine blade and MCrAlY coating

A technology of stability control and hot corrosion, applied in metal material coating process, coating, ion implantation plating, etc., can solve problems such as poor interface stability, and achieve the effect of improving interface stability

Active Publication Date: 2020-03-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The greater the difference between the composition of the alloy and the coating, the worse the interface stability

Method used

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  • Interface stability control method for heat-and-corrosion-resistant single-crystal alloy combustion engine blade and MCrAlY coating
  • Interface stability control method for heat-and-corrosion-resistant single-crystal alloy combustion engine blade and MCrAlY coating
  • Interface stability control method for heat-and-corrosion-resistant single-crystal alloy combustion engine blade and MCrAlY coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for controlling the interface stability of a thermal corrosion-resistant single crystal alloy gas turbine blade and MCrAlY coating, taking DD420 single crystal superalloy as an example, the specific steps are as follows:

[0029] 1) Preparation of single crystal alloy test rods by high-speed solidification directional solidification process (HRS);

[0030] 2) After the as-cast single crystal alloy test rod is heat-treated, the (001) oriented single crystal test rod is selected, and the flake samples with different second crystal orientations are cut by wire electric discharge cutting, wherein the (001) orientation is set as the longitudinal direction of the sample (i.e. the first orientation), cut (100) and (210) orientation planar sheet samples (such as figure 1 shown), then mechanically polished to a smooth surface;

[0031] 3) Surface sandblasting is carried out on the surface of the sample. The sandblasting process parameters are: pressure: 0.3MPa, angle: ...

Embodiment 2

[0035] A method for controlling the interface stability of a thermal corrosion-resistant single crystal alloy gas turbine blade and MCrAlY coating, taking DD402 single crystal superalloy as an example, the specific steps are as follows:

[0036] 1) Preparation of single crystal alloy test rods by high-speed solidification directional solidification process (HRS);

[0037] 2) After the as-cast single crystal alloy test rod is heat-treated, the (001) oriented single crystal test rod is selected, and the flake samples with different second crystal orientations are cut by wire electric discharge cutting, wherein the (001) orientation is set as the longitudinal direction of the sample (i.e. the first orientation), cut (210) oriented planar flake samples, and then mechanically polish until the surface is smooth;

[0038] 3) Perform surface pretreatment of three processes on the surface of the sample:

[0039] ①. Surface heavy sandblasting (pressure: 0.3MPa, angle: 90°, duration: 10...

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Abstract

The invention discloses an interface stability control method for a heat-and-corrosion-resistant single-crystal alloy combustion engine blade and a MCrAlY coating. Aiming to anisotropy of the single-crystal alloy blade as well as combustion engine single-crystal blades of different grades and operation temperature distribution characteristics of the blades at different positions, the method whichcan improve the interface stability for the heat-and-corrosion-resistant single-crystal alloy combustion engine blade and the MCrAlY coating is provided through a single-crystal alloy secondary dendrite orientation distribution and surface recrystallization control technology, and specifically a special secondary-orientation single-crystal blade is prepared according to the service temperature ofthe combustion engine blade; under a heat exposure condition of 900 DEG C, a (100) orientation is selected as a preferred secondary orientation; and under a heat exposure condition of 1000 DEG C, a (210) orientation is selected as the preferred secondary orientation. Meanwhile, surface sand blasting treatment parameters of the blade are adjusted, so that the surface plastic deformation amount andthe thickness of a recrystallization layer are reduced, and the long-time service interface stability of single crystal alloy and the MCrAlY coating is further improved.

Description

technical field [0001] The invention belongs to the field of preparation of single crystal alloy turbine blades, and relates to the field of preparation of surface coatings of single crystal alloy gas turbine blades resistant to heat corrosion. Background technique [0002] Nickel-based single crystal superalloys are widely used in the manufacture of single crystal turbine blades for advanced aero-engines and gas turbines due to their excellent high-temperature mechanical properties. Gas turbine single crystal turbine blades are not only required to have excellent high-temperature mechanical properties under harsh service conditions, but also to resist high-temperature oxidation and thermal corrosion damage. Therefore, the use of coating / single crystal superalloy structure is one of the main ways to meet the above two performance requirements at the same time. In addition to being used as cladding coating, MCrAlY type protective coating is also commonly used as the bonding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/32C23C14/16C23C14/02
CPCC23C14/028C23C14/16C23C14/325
Inventor 姜祥伟董加胜吴俊杰姜卫国楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI