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Method for preparing micrometer-particle-contained high-temperature-oxidation-resistant composite coating on surface of niobium alloy

A high-temperature oxidation-resistant, micro-particle technology, applied in metal material coating process, coating, superimposed layer plating, etc. Degradation, uniform and dense coating effect

Inactive Publication Date: 2015-12-23
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the coatings prepared by the above four patents have solved the problem of niobium alloy oxidation in high-temperature atmospheric environments, the coatings are mainly prepared by slurry method and spraying method, and the specific test results (such as phase analysis) after the coating is oxidized and shape characteristics, etc.) are not yet clear

Method used

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  • Method for preparing micrometer-particle-contained high-temperature-oxidation-resistant composite coating on surface of niobium alloy
  • Method for preparing micrometer-particle-contained high-temperature-oxidation-resistant composite coating on surface of niobium alloy
  • Method for preparing micrometer-particle-contained high-temperature-oxidation-resistant composite coating on surface of niobium alloy

Examples

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Effect test

Embodiment 1

[0033] A method for preparing a high-temperature oxidation-resistant composite coating containing micron particles on the surface of a niobium alloy, comprising the following steps:

[0034] 1. Pretreatment: The base material is niobium alloy, and the base material is ultrasonically cleaned in acetone and absolute ethanol with a mass concentration of 99.9% respectively for 10 minutes, and dried;

[0035] 2. Coating pretreatment:

[0036] Substrates are pretreated in turn as follows:

[0037] Chemical degreasing, degreasing agent formula: 25g / LNa 3 PO 4 12H 2 O,30g / LNa 2 CO 3 , 10g / LNa 2 SiO 3 ;

[0038] Pickling, mixed acid proportioning is: water: sulfuric acid volume ratio=1:1, wherein sulfuric acid mass concentration is 95%;

[0039] One-time zinc dipping, the formula of zinc dipping solution is: 50g / LNaOH, 2g / LKNaC 4 h 4o 6 ·H 2 O,5g / LZnO,2g / LFeCl 3 ·6H 2 O,1g / LNaNO 3 ;

[0040] Zinc stripping, zinc stripping solution is water: nitric acid volume ratio=1:1...

Embodiment 2

[0051] 1, pretreatment is the same as embodiment 1.

[0052] 2. Coating pretreatment:

[0053] Substrates are pretreated in turn as follows:

[0054] Chemical degreasing is the same as in Example 1.

[0055] Pickling, mixed acid proportioning is: water: sulfuric acid volume ratio=1:1, wherein sulfuric acid concentration is 97%;

[0056] One-time galvanizing and two-time galvanizing are all the same as in Example 1.

[0057] Zinc stripping, zinc stripping solution is water: nitric acid volume ratio=1:1, wherein nitric acid mass concentration is 66%;

[0058] Wash with distilled water;

[0059] 3. Particle activation: the CeO 2 Micron particles are soaked in an alcohol solution with a mass concentration of 99.9%, and 2g / L of OP-21 is added to stir and soak. After the alcohol solution is clarified, pour off the alcohol solution and add deionized water to soak; soak in alcohol solution and deionized water for activation treatment 10 minutes each.

[0060] 4. Preparation of ...

Embodiment 3

[0066] 1, pretreatment is the same as embodiment 1.

[0067] 2. Coating pretreatment:

[0068] The samples were pretreated sequentially as follows:

[0069] Chemical degreasing is the same as in Example 1.

[0070] Pickling, mixed acid proportioning is: water: sulfuric acid volume ratio=1:1, wherein sulfuric acid concentration is 98%;

[0071] One-time galvanizing and two-time galvanizing are all the same as in Example 1.

[0072] Zinc stripping, zinc stripping solution is water: nitric acid volume ratio=1:1, wherein nitric acid mass concentration is 68%;

[0073] 3. Particle activation: the CeO 2 Micron particles are soaked in an alcohol solution with a mass concentration of 99.9%, and 2g / L of OP-21 is added to stir and soak. After the alcohol solution is clarified, pour off the alcohol solution and add deionized water to soak; soak in alcohol solution and deionized water for activation treatment 10 minutes each.

[0074] 4. Preparation of Ni-CeO 2 Plating:

[0075] P...

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Abstract

The invention discloses a method for preparing a micrometer-particle-contained high-temperature-oxidation-resistant composite coating on the surface of niobium alloy. The method comprises the steps that firstly, a Ni-CeO2 plating is deposited on a substrate through a composite chemical plating process; and an Al-rich penetration layer is deposited on the plating through a pack cementation process, and the composite coating is formed. The composite coating prepared through the method can be well combined with the substrate, the coating is uniform and compact and good in high-temperature oxidation resistance and can bear oxidation at the temperature at 1200 DEG C, the service life of the coating is prolonged, and the process is simple.

Description

technical field [0001] The invention relates to the technical field of high-temperature protective coatings, in particular to a method for preparing a high-temperature oxidation-resistant composite coating containing micron particles on the surface of a niobium alloy. Background technique [0002] When aerospace, nuclear industry and gas turbines are working, the blades must withstand high temperatures of 1000°C to 1200°C. Nickel-based high temperature is limited by its own melting point (about 1400°C), and its service temperature limit is only 1100°C. Therefore, it is imperative to develop high-temperature structural materials with higher service temperatures. Metal niobium (Nb) has the advantages of high melting point, low density and high specific strength at high temperature, etc., but the oxidation resistance of niobium and niobium alloys is poor, and pure metal Nb will undergo catastrophic "powdering" oxidation at 600 °C. Oxidation belongs to a system with obvious cra...

Claims

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Application Information

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IPC IPC(8): C23C18/36C23C18/18C23C10/48C23C28/00
Inventor 李伟洲杨阳黄祖江唐仕光陈泉志
Owner GUANGXI UNIV
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