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High-temperature antioxidant niobium alloy composite coating and preparation method thereof

A high-temperature anti-oxidation and composite coating technology, which is applied in chemical instruments and methods, metal material coating processes, coatings, etc., can solve problems such as poor high-temperature oxidation resistance, and achieve extended service life, good high-temperature oxidation resistance, The effect of uniform and dense coating

Active Publication Date: 2014-03-05
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to aim at the shortcomings of poor high-temperature oxidation resistance of niobium alloys, using magnetron sputtering technology, to provide a high-temperature oxidation-resistant niobium alloy composite coating and its preparation method, which greatly improves the protective coating of niobium alloys. Excellent high temperature anti-oxidation effect, prolonging the service life of the coating

Method used

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  • High-temperature antioxidant niobium alloy composite coating and preparation method thereof
  • High-temperature antioxidant niobium alloy composite coating and preparation method thereof
  • High-temperature antioxidant niobium alloy composite coating and preparation method thereof

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Embodiment 1

[0029] A method for preparing a high-temperature oxidation-resistant niobium alloy composite coating, comprising the following steps:

[0030] 1. Pretreatment: The base material is FeCrAl alloy, and the target material is metal Nb, Cr and Al targets with a purity of 99.2%. The base material and the target material are ultrasonically cleaned in acetone and absolute ethanol for 15 minutes respectively, and dried;

[0031] 2. Preparation of coating: vacuumize the sample chamber to 2×10 -4 Pa, the volume is 50% argon gas; the surface of the substrate is cleaned by high-pressure bombardment of -400V, and the bombardment time is 20min; Cr is pre-deposited on the substrate with a thickness of 0.1 μm as a transition layer; DC reactive magnetron sputtering Nb and Cr, Nb and Cr element content: Nb40at%, Cr60at%, deposit Nb-Cr coating on the transition layer, Nb and Cr target power is fixed at 2000W, deposition time is 2h, coating The thickness is 4 μm; DC reactive magnetron sputtering ...

Embodiment 2

[0034] A method for preparing a high-temperature oxidation-resistant niobium alloy composite coating, comprising the following steps:

[0035] 1. Pretreatment: the base material is Al 2 o 3 Alloy, the target material is metal Nb, Cr and Al targets with a purity of 99.4%; the base material and the target material were ultrasonically cleaned in acetone and absolute ethanol for 15 minutes respectively, and dried;

[0036] 2. Preparation of coating: vacuumize the sample chamber to 1×10 -4 Pa, the volume is 40% argon gas; the surface of the substrate is cleaned by high-pressure bombardment of -300V, and the bombardment time is 10 minutes; Cr is pre-deposited on the substrate with a thickness of 0.05 μm as a transition layer; DC reactive magnetron sputtering Nb and Cr, Nb and Cr element content: Nb35at%, Cr65at%, deposit Nb-Cr coating on the transition layer, Nb and Cr target power is fixed at 3000W, deposition time is 1h, coating The thickness is 3 μm; DC reactive magnetron sput...

Embodiment 3

[0039] A method for preparing a high-temperature oxidation-resistant niobium alloy composite coating, comprising the following steps:

[0040] 1. Pretreatment: The base material is Ni-based superalloy DSM11, and the target material is metal Nb, Cr and Al targets with a purity of 95.0%. The base material and the target material are ultrasonically cleaned in acetone and absolute ethanol for 15 minutes respectively, blown Dry;

[0041] 2. Preparation of coating: vacuumize the sample chamber to 3×10 -4Pa, the volume is 60% argon gas; the surface of the substrate is cleaned by high-pressure bombardment of -500V, and the bombardment time is 30min; Cr is pre-deposited on the substrate with a thickness of 0.15μm as a transition layer by DC reactive magnetron sputtering; DC reactive magnetron sputtering Nb and Cr, Nb and Cr element content: Nb45at%, Cr55at%, deposit Nb-Cr coating on the transition layer, Nb and Cr target power is fixed at 3000W, deposition time is 1h, coating The thi...

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Abstract

The invention discloses a high-temperature antioxidant niobium alloy composite coating and a preparation method thereof. The composite coating adopts three high-purity metal target materials of Cr, Nb and Al, an Al / Nb-Cr composite coating is deposited on a substrate by utilizing a magnetron sputtering technology, to be specific, performing direct-current reactive magnetron sputtering of Cr, and pre-depositing Cr with the thickness of 0.05 to 0.15 micrometers as a transitional layer; performing direct-current reactive magnetron sputtering of Nb and Cr, wherein the content of each of the Nb and Cr is as follows: 35 to 45at% of Nb, and 55 to 65at% of Cr, and depositing a Nb-Cr coating on the transitional layer, wherein the thickness of the coating is 3 to 5 micrometers; performing direct-current reactive magnetron sputtering of Al, and depositing an Al outer layer on the deposited Nb-Cr coating, wherein the deposition thickness is 3 to 4 micrometers. The prepared Al / Nb-Cr composite coating is well combined with the substrate, the coating is uniform and dense, the high-temperature antioxidant property is good, the process is simple, the repeatability is good, and the composite coating can be prepared in a large area.

Description

technical field [0001] The invention relates to the technical field of high-temperature protective coatings, in particular to a high-temperature oxidation-resistant niobium alloy composite coating and a preparation method thereof. Background technique [0002] High-temperature protective coatings are mainly used in hot-end components manufactured in industries such as aerospace, nuclear industry, and gas turbines. Metal niobium has the advantages of high melting point, low density and high specific strength at high temperature, and is considered to be the most potential high-temperature structural material to replace the existing nickel-based alloys. However, the oxidation resistance of niobium and niobium alloys is poor, and pure metal Nb undergoes catastrophic oxidation at 600°C, losing effective protection for the substrate. Therefore, improving the high-temperature oxidation resistance of niobium alloys and forming a protective oxide film on its surface is the key to br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/14C23C14/58B32B15/01
Inventor 李伟洲许安刘伟秦泽华周敏杨阳陈泉志范明林
Owner GUANGXI UNIV