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Fe-Al-Nb alloy coating and preparation method thereof

A fe-al-nb, alloy coating technology, applied in the direction of metal material coating process, coating, metal layered products, etc., to reduce room temperature brittleness, solve cracking or even peeling, and save rare metal element Nb.

Active Publication Date: 2014-10-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is a lack of a Fe-Al-Nb alloy coating with high strength, good toughness, and excellent high-temperature comprehensive performance and its preparation method

Method used

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  • Fe-Al-Nb alloy coating and preparation method thereof
  • Fe-Al-Nb alloy coating and preparation method thereof
  • Fe-Al-Nb alloy coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A kind of Fe-Al-Nb alloy coating of the present invention, Fe-Al-Nb alloy coating is made up of base layer, deposit layer and diffusion layer three parts; Described base layer is common carbon steel material, and described deposit layer is made of Nb99.5wt%, the rest consists of AlNb 2 , Fe 7 Nb 6 , Fe 2 Al 5 and Fe 3 Al composition;

[0044] Such as figure 1 with figure 2 As shown, the surface of the Fe-Al-Nb alloy coating prepared by the present invention is smooth and bright, the microstructure is distributed in a cellular form, and the small polygonal particles are in an island-like three-dimensional shape; the coating thickness is 200 μm,

[0045] Such as image 3 As shown, the deposited layer is mainly Nb, and Nb is 99.5wt%;

[0046] Such as Figure 4 As shown, the remaining 0.5wt% of the deposited layer consists of AlNb 2 , Fe 7 Nb 6 , Fe 2 Al 5 and Fe 3 Al cemented carbide phase composition, significantly improving its surface hardness;

[0047...

Embodiment 2

[0072] The preparation method of Fe-Al-Nb alloy coating of the present invention comprises the steps:

[0073] Hot-dip aluminum plating + vacuum diffusion annealing process:

[0074] (1) Cleaning: prepare the Q235 plate; degreasing: place the above Q235 in an acetone solution for ultrasonic cleaning for 5 minutes to remove oil, and then use distilled water to clean the remaining acetone solution on the surface; % dilute hydrochloric acid for 20 minutes to remove rust, and then use distilled water to clean the remaining hydrochloric acid solution on the surface of the material;

[0075] (2) Flux plating: place Q235 in a flux with a temperature of 70°C, take out the sample after 15 minutes and quickly dry the surface of the sample;

[0076] (3) Melting aluminum: adding industrial pure aluminum ingots into graphite crucibles and heating to 800°C to become a liquid, and then removing the oxides covering the surface of the molten aluminum, and evenly spreading the covering agent o...

Embodiment 3

[0090] The preparation method of Fe-Al-Nb alloy coating of the present invention comprises the steps:

[0091] Hot-dip aluminum plating + vacuum diffusion annealing process:

[0092] (1) Cleaning: prepare 45 steel plates; degreasing: put the above 45 steel in acetone solution for ultrasonic cleaning for 8 minutes to remove oil, and then use distilled water to clean the remaining acetone solution on the surface; derusting: place in concentration after degreasing Soak in 8% dilute hydrochloric acid for 15 minutes to remove rust, and then use distilled water to clean the remaining hydrochloric acid solution on the surface of the material;

[0093] (2) Flux plating: place 45 steel in a flux with a temperature of 75°C, take out the sample after 13 minutes and quickly dry the surface of the sample;

[0094] (3) Melting aluminum: add industrial pure aluminum ingots into graphite crucibles and heat to 775°C to become liquid, then remove the oxides covering the surface of the molten a...

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Abstract

The invention discloses a Fe-Al-Nb alloy coating which comprises three parts such as a base body layer, a sedimentary layer and a diffusion layer, wherein the base body layer is made of ordinary carbon steel; the sedimentary layer comprises 99.5 weight percent of Nb, and 5 weight percent of AlNb2, Fe7Nb6, Fe2Al5 and Fe3Al; the diffusion layer comprises 25 to 34 weight percent of Al, 65 to 73 weight percent of Fe and 1.0 to 2.0 weight percent of Nb; the thickness of the Fe-Al-Nb alloy coating is 150 to 200 <Mu>m; the ordinary carbon steel is 45 steel or Q235 steel. According to the invention, not only can the strength and high-temperature corrosion resistance of an Fe-Al based coating improved, but also the tenacity of the Fe-Al based coating is improved, so as to effectively reduce the ambient temperature fragility of the Fe-Al based coating.

Description

technical field [0001] The invention relates to the technical field of surface modification of metal materials, in particular to an Fe-Al-Nb alloy coating and a preparation method thereof. Background technique [0002] Fe-Al intermetallic compound is one of the most deeply researched intermetallic compounds at present. It has high specific strength, excellent corrosion resistance, abundant resources and low cost. However, due to the nature of its own bonding bonds, crystal structure, defect sensitivity, degree of order, and environmental factors, the plasticity, toughness, and high-temperature comprehensive performance of Fe-Al alloy coatings above 600 °C cannot meet high temperature, thermal corrosion, and wear. The coexistence of harsh service environment requirements seriously restricts the industrial application of Fe-Al alloy coatings. [0003] Deng Wen et al. are studying the effect of Nb on Fe 3 The influence of valence electron density at defect sites in the Al all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01C23C28/02C23C2/12C23C10/08
Inventor 姚正军张泽磊罗西希张平则陈煜杨红勤吴小凤林玉划徐尚君
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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