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CoCrNiAlY multilayer high-temperature protective coating as well as weight gain control method and preparation method thereof

A protective coating and high-temperature technology, applied in coatings, metal material coating technology, high-efficiency propulsion technology, etc., can solve problems such as linear weight gain, achieve the effects of prolonging service life and improving high-temperature oxidation resistance

Active Publication Date: 2022-05-24
UNIV OF SCI & TECH LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a CoCrNiAlY multilayer high-temperature protective coating and its weight gain control method and preparation method in a high temperature environment, at least to solve the technology of linear weight gain when the coating is used in a high temperature (>700°C) environment question

Method used

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  • CoCrNiAlY multilayer high-temperature protective coating as well as weight gain control method and preparation method thereof
  • CoCrNiAlY multilayer high-temperature protective coating as well as weight gain control method and preparation method thereof
  • CoCrNiAlY multilayer high-temperature protective coating as well as weight gain control method and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The base material is superalloy GH4169, the size of the sample is 15mm×15mm×5mm, and the size of the coating surface (coating area) is 15mm×15mm. Before coating, the surface of the sample is ground, cleaned, sandblasted, and then ultrasonically cleaned; then the treated sample substrate is placed on the turntable in the vacuum chamber of the arc ion plating equipment, and the vacuum is started. up to 6×10 -3 When Pa, argon gas was introduced into the vacuum chamber, and the air pressure was controlled at 0.6Pa; the negative pulse bias voltage of the substrate was controlled to be -120V, and the gas glow discharge was enhanced by the arc, and the surface of the substrate was cleaned by glow discharge ions for 60 minutes; Then start to deposit CoCrNiAlY-Al multi-layer coating (first adjust the Ar gas flow, control the air pressure in the vacuum chamber to 1.2Pa; control the substrate with pulse negative bias to -80V, turn on the CoCrNiAlY target and the Al target at the s...

Embodiment 2

[0029] The base material is titanium alloy (grade Ti6Al4V), the size of the sample is 20mm×20mm×5mm, and the size of the coating surface (coating area) is 20mm×20mm. Before coating, the surface of the sample is polished, cleaned, sandblasted, and then ultrasonically cleaned; then the treated sample substrate is placed on the turntable in the vacuum chamber of the arc ion plating equipment, and the vacuum is started. When the vacuum degree in the vacuum chamber reaches 5.6×10 -3At Pa, argon gas was introduced into the vacuum chamber, and the air pressure was controlled to 0.8Pa; the negative pulse bias voltage of the substrate was controlled to -160V, and the sample was cleaned by glow discharge ions for 60 minutes by arc-enhanced gas glow discharge; then deposition began. CoCrNiAlY-Al multi-layer coating (firstly adjust the Ar gas flow, control the air pressure in the vacuum chamber to 1.1Pa; the substrate plus pulse negative bias is adjusted to -100V, and the CoCrNiAlY target...

Embodiment 3

[0031] The base material is stainless steel (grade 1Cr18Ni9Ti), the size of the sample is 20mm×10mm×10mm, and the size of the coating surface (coating area) is 20mm×10mm. Before coating, the surface of the sample is polished, cleaned, sandblasted, and then ultrasonically cleaned; then the treated sample substrate is placed on the turntable in the vacuum chamber of the arc ion plating equipment, and vacuum is started. When the vacuum degree in the vacuum chamber reaches 4.6×10 -3 At Pa, argon gas was introduced into the vacuum chamber, and the air pressure was controlled at 0.4Pa; the substrate was subjected to a pulsed negative bias voltage of -180V, and the gas glow discharge was enhanced by the arc, and the sample was cleaned by glow discharge ions for 55 minutes; then the deposition started. CoCrNiAlY-Al multi-layer coating (firstly adjust the Ar gas flow, control the air pressure in the vacuum chamber to 1.0Pa; add pulse negative bias to the substrate to -70V, turn on the ...

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Abstract

The invention provides a CoCrNiAlY multilayer high-temperature protective coating and a weight gain control method and a preparation method thereof in a high-temperature environment, the coating comprises a plurality of CoCrNiAlY layers and a plurality of Al layers which are alternately deposited on the surface of a matrix, the first CoCrNiAlY layer is deposited on the surface of the matrix, the outermost layer is the Al layer, and the total thickness of the coating is 10.1-11 microns; the preparation method comprises the steps of pretreatment, ion cleaning and CoCrNiAlY / Al multi-layer coating deposition. The weight gain control method comprises the steps that the obtained workpiece is placed in a dry environment at the temperature of 750 DEG C for 60 hours, in the process, the coating is placed in a normal-temperature environment for 1-2 minutes every 20 hours, and the oxygen content in the dry environment is 21 + / -1%. By the adoption of the scheme, the weight increasing condition of the coating used in the high-temperature environment can be accurately controlled, the high-temperature oxidation resistance and the hot corrosion resistance of the coating can be greatly improved, the service life of the coating is prolonged, and meanwhile a large number of chromate spinel phases can be prevented from being generated.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coatings, and in particular relates to a CoCrNiAlY multi-layer high temperature protective coating, a weight gain control method and a preparation method thereof in a high temperature environment. Background technique [0002] The MCrAlY coating is derived from the third-generation high-temperature protective coating, where M represents the Ni-based or Co-based ternary Ni-Cr-Al or Co-Cr-Al alloy system, and the quaternary Ni-Co based on Ni and Co at the same time Coatings composed of -Cr-Al alloy system (such as CoCrNiAlY coating) have more outstanding corrosion resistance and excellent mechanical properties. The MCrAlY coating is generally used as the tie layer of the thermal barrier coating, which together with the surface ceramic layer constitutes the thermal barrier coating. [0003] However, when the thermal barrier coating system represented by the CoCrNiAlY coating is used for a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/32C23C14/02C23C14/14
CPCC23C14/325C23C14/14C23C14/025Y02T50/60
Inventor 解志文刘天新赵彦辉高旭胡素影陈永君
Owner UNIV OF SCI & TECH LIAONING
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