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High-temperature coating comprising nickel-chromium-oxygen active diffusion barrier layer and preparation method

An oxygen-active, high-temperature technology, applied in chemical instruments and methods, layered products, metal layered products, etc., can solve the problems of anti-oxidation coatings that have not been reported yet, and achieve excellent thermal stability, small impact, and thermal stability sex high effect

Active Publication Date: 2015-03-11
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

[0004] Anti-oxidation coatings employing Ni-Cr-O thin films as active diffusion barriers have not been reported so far

Method used

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  • High-temperature coating comprising nickel-chromium-oxygen active diffusion barrier layer and preparation method
  • High-temperature coating comprising nickel-chromium-oxygen active diffusion barrier layer and preparation method
  • High-temperature coating comprising nickel-chromium-oxygen active diffusion barrier layer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The base material is DZ125 alloy, the base sample size is 20mm×10mm×3mm, and the purity of the nickel-chromium target is 99.95wt%. After the substrate sample is cleaned on the surface, it is loaded into the working chamber, and the vacuum chamber is heated to 250°C; argon / oxygen mixed gas (volume ratio 1:1) is introduced to maintain the vacuum degree of the working chamber at 1.0Pa, DC bias voltage 600V, arc current 60A. Preparation parameters of NiCrAlY coating: argon gas pressure 0.1Pa, substrate temperature 250°C, arc current 65A, DC bias voltage -10V, duty cycle 20%. In this embodiment, the chemical composition of the nickel-chromium-oxygen inner layer is: chromium content 18wt.%, oxygen content 26wt.%, and the rest is nickel; the chemical composition of the nickel-chromium-aluminum-yttrium coating is: chromium content 24wt.%, aluminum The content is 10wt.%, the yttrium content is 0.5wt.%, and the rest is nickel.

[0036] Such as figure 1 As shown in the cross-se...

Embodiment 2

[0038] The base material is DD5 superalloy, the base sample size is 20mm×10mm×3mm, and the target material is a Ni-Cr alloy target with a chromium content of 30wt.%. After the substrate sample is cleaned on the surface, it is loaded into the working room, and the vacuum chamber is heated to 230 °C; the pressure of the argon / oxygen mixture (volume ratio 1:1) is 1.5Pa, the DC bias voltage is 650V, the arc current is 65A, and the nickel-chromium-oxygen film is The thickness is about 3 μm. In this embodiment, the chemical composition and content of the nickel-chromium-oxygen inner layer are as follows: the chromium content is 16wt.%, the oxygen content is 29wt.%, and the rest is nickel. A layer of NiCrAlY (Ni-25Cr-11Al-0.5Y, wt.%) coating with a thickness of about 40 μm was deposited by multi-arc ion plating technology, and the preparation parameters were: argon pressure 0.2Pa, substrate temperature 200°C, arc current 70A, DC bias -20V, duty cycle 30%, deposition 540min. Subsequ...

Embodiment 3

[0041] The base material is a Rene N5 superalloy, the base sample size is 15mm×10mm×3mm, and the target material is a Ni-Cr alloy target with a chromium content of 25wt.%. After the substrate sample is cleaned on the surface, it is loaded into the working room, and the vacuum chamber is heated to 250°C; the argon / oxygen mixture (volume ratio 1:1) has a pressure of 1.2Pa, a DC bias voltage of 620V, and an arc current of 70A. The film thickness is about 4 μm. In this embodiment, the chemical composition of the nickel-chromium oxide layer is: oxygen 25wt%, chromium 22wt.%, and the rest is nickel. A layer of NiCoCrAlY (Ni-22Co-24Cr-10Al-0.5Y, wt.%) coating with a thickness of about 40 μm was deposited on the NiCrO layer by plasma spraying technology. Subsequently, the substrate / coating system was oxidized 200 times at 1100° C. (each cycle consisted of 1 hour of heating and 15 minutes of cooling).

[0042] The cross-sectional morphology of the sample after cyclic oxidation was ob...

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Abstract

The invention relates to a high-temperature coating technology, in particular to a high-temperature coating comprising a nickel-chromium-oxygen active diffusion barrier layer and a preparation method. The high-temperature protection coating comprises a nickel-chromium-oxygen active diffusion barrier inner layer and a high-temperature oxidation protection outer layer. The nickel-chromium-oxygen inner layer can be spontaneously transformed into an alumina / metal / alumina multilayer film structure in a use process, prevent mutual diffusion between the high-temperature oxidation protection outer layer and a metal matrix and has good bonding strength and thermostability, so that effective oxidation resistance components in the high-temperature oxidation protection outer layer are prevented from diffusion to the matrix, the service life of the high-temperature coating is prolonged, and mechanical properties of the matrix are not damaged. The preparation method comprises the steps of preparing the nickel-chromium-oxygen layer on the surface of the matrix by a multi-arc ion plating physical vapor deposition method, and then preparing the high-temperature oxidation protection layer on the active diffusion barrier layer by one or a combination of a vacuum physical vapor deposition method, chemical vapor deposition method, a hot spraying method and the like.

Description

technical field [0001] The invention relates to high-temperature coating technology, in particular to a high-temperature coating containing a nickel-chromium-oxygen active diffusion barrier layer for high-temperature protection of various metal components and a preparation method thereof. Background technique [0002] Applying high-temperature protective coatings on the surface of engine blades made of high-temperature alloys, such as: MCrAlY coating (M=Ni, Co), is an effective way to improve the high-temperature corrosion resistance of blades. However, the increase in engine operating temperature significantly intensifies the interdiffusion of alloy components between the blade substrate and the protective coating, specifically as follows: (1) Al and Cr diffuse from the MCrAlY protective coating to the substrate, resulting in the depletion of beneficial components in the coating. Alloy components such as W and Mo diffuse from the substrate to the coating, resulting in a dec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B33/00B32B15/01C22C21/00C22C30/00C22C27/06
CPCB32B15/017C22C21/00C22C27/06C22C30/00
Inventor 王福会朱圣龙王文于萍王世臣
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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