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Preparation method of TD3 alloy surface oxidation-resistant coating

An anti-oxidation coating and alloy technology, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc. Large stress and other problems, to achieve the effect of reducing the difference in thermal expansion coefficient, improving bonding performance, and continuous and dense structure

Inactive Publication Date: 2020-04-24
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of preparing the protective coating by the above method is complex, high cost, and long cycle, and some use high temperature sintering, and the tensile strength of TD3 alloy will be seriously reduced in a high temperature environment above 800 ° C, so high temperature sintering (> 1000 ° C) is required. The solid phase reaction is no longer applicable
In addition, the coatings prepared by the above methods all have problems such as large internal stress of the ceramic coating and weak bonding with the substrate, resulting in unsatisfactory resistance to cyclic oxidation of the coating.

Method used

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  • Preparation method of TD3 alloy surface oxidation-resistant coating
  • Preparation method of TD3 alloy surface oxidation-resistant coating

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The specific steps for preparing anti-oxidation coating on the surface of TD3 alloy are as follows:

[0035] (1) Choose TD3 alloy with a size of 70mm×8mm×1mm as the substrate, and perform grinding, polishing, degreasing, pickling, cleaning and drying treatments on the surface of the substrate to make its surface roughness 5μm;

[0036] (2) Immerse the roughened substrate into NiO sol with a concentration of 0.65mol / L, and then pull it out slowly at a uniform speed to make the NiO sol evenly cover the surface of the substrate. After the NiO sol is dried at room temperature, it is placed in 200 Dry for 1 hour at ℃, repeat the immersion-pull-out-drying operation twice to form a transition layer with a thickness of 5μm on the surface of the substrate;

[0037] (3) SiO with a mass fraction of 30% 2 Aqueous solution, Al with an average particle size of 30nm 2 O 3 Powder, Al with an average particle size of 0.5μm 2 O 3 Powder, Al(H 2 PO 4 ) 3 And Na 2 SiO 3 According to the mass rati...

Embodiment 2

[0043] The specific steps for preparing anti-oxidation coating on the surface of TD3 alloy are as follows:

[0044] (1) Select the TD3 alloy with a size of 70mm×8mm×1mm as the substrate, and perform grinding, polishing, degreasing, pickling, cleaning and drying treatments on the surface of the substrate to make the surface roughness 2μm;

[0045] (2) Immerse the roughened substrate in NiO sol with a concentration of 0.8 mol / L, and then pull it out slowly at a uniform speed to make the NiO sol evenly cover the surface of the substrate. After the NiO sol is dried at room temperature, it is placed in 200 Dry for 1 hour at ℃, repeat the immersion-pull-out-drying operation 3 times to form a transition layer with a thickness of 10μm on the surface of the substrate;

[0046] (3) SiO with a mass fraction of 25% 2 Aqueous solution, Al with an average particle size of 10nm 2 O 3 Powder, Al with an average particle size of 0.5μm 2 O 3 Powder, Al(H 2 PO 4 ) 3 And Na 2 SiO 3 According to the mass...

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Abstract

The invention relates to a preparation method of a TD3 alloy surface oxidation-resistant coating, and belongs to the technical field of high-temperature-resistant coating preparation. According to thepreparation method, a transition layer selects NiO sol as raw materials, a composite ceramic layer selects Al2O3-SiO2 sol as the raw materials, and preparation is carried out by combining sol-gel, low-temperature sintering and electron beam cladding. The method is simple in process and easy to realize, and the prepared oxidation-resistant coating and the substrate have good bonding force, and also have good high-temperature oxidation corrosion resistance and washing-out resistance.

Description

Technical field [0001] The invention relates to a method for preparing an oxidation-resistant coating on the surface of a TD3 alloy, and belongs to the technical field of high-temperature resistant coating preparation. Background technique [0002] At present, the TD3 alloy developed by our country has a long-term use temperature of 650℃, and can be used for a short time at 750℃~850℃. In an aerobic environment above 600°C, the performance of TD3 alloy is significantly reduced, and the effect of improving the high temperature oxidation resistance of the alloy by adjusting the microstructure is limited. Adding alloying elements to change the high temperature oxidation resistance of titanium and aluminum alloys is the main way to develop high temperature alloys. However, the overall alloying improves the high-temperature oxidation resistance, and at the same time it also affects the mechanical properties of the alloy such as plasticity and yield strength. Therefore, in order to ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12C23C24/10
CPCC23C18/1216C23C18/1225C23C18/1241C23C18/1254C23C18/1295C23C24/10
Inventor 张永和何俊翟大鹏
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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