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Control method of interface stability between hot corrosion resistant single crystal alloy gas turbine blade and mcraly coating

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

Active Publication Date: 2021-09-24
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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  • Control method of interface stability between hot corrosion resistant single crystal alloy gas turbine blade and mcraly coating
  • Control method of interface stability between hot corrosion resistant single crystal alloy gas turbine blade and mcraly coating
  • Control method of interface stability between hot corrosion resistant single crystal alloy gas turbine blade and mcraly coating

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Experimental program
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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

Aiming at the anisotropy of single crystal alloy blades and the operating temperature distribution characteristics of single crystal blades of different grades of gas turbines and different positions of the blades, the invention provides an improvement technology through single crystal alloy secondary dendrite orientation distribution and surface recrystallization control technology. The method of interface stability between hot corrosion resistant single crystal alloy and MCrAlY coating is specifically to prepare single crystal blades with special secondary orientation according to the service temperature conditions of gas turbine blades: under the condition of heat exposure at 900°C, select (100) orientation as the preferred secondary Secondary orientation; under the condition of 1000°C heat exposure, the (210) orientation is selected as the preferred secondary orientation. At the same time, adjusting the sandblasting parameters of the blade surface can reduce the amount of plastic deformation on the surface and the thickness of the recrystallized layer, thereby further improving the stability of the long-term service interface between the single crystal alloy and the MCrAlY coating.

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 Patents(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