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High-temperature-resistant composite coating containing rare earth aluminate and preparation method of high-temperature-resistant composite coating

A composite coating and aluminate technology, which is applied in coatings, surface reaction electrolytic coatings, metal material coating processes, etc., can solve the problems of few research reports on the thermal properties of rare earth aluminates, and achieve excellent high temperature resistance Effects of ablation characteristics, excellent thermal insulation performance, and high roughness factor

Pending Publication Date: 2022-02-15
BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the thermal properties of rare earth aluminates

Method used

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  • High-temperature-resistant composite coating containing rare earth aluminate and preparation method of high-temperature-resistant composite coating

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] In another aspect, the present invention provides a method for preparing a high temperature resistant composite coating containing rare earth aluminate, comprising the following steps:

[0048] Step 1: performing micro-arc oxidation treatment on the alloy substrate to obtain a micro-arc oxidation film layer with a film thickness of 10-20 μm;

[0049] Step 2: preparing a layer of metal bonding layer on the micro-arc oxidation film layer;

[0050] Step 3: Using the atmospheric plasma spraying process to deposit the rare earth aluminate spray powder on the surface of the metal bonding layer in step 2 to obtain the atmospheric plasma sprayed rare earth aluminate ceramic layer, and complete the preparation of the high temperature resistant composite coating containing rare earth aluminate .

[0051] Specifically, in the above step 1, the micro-arc oxidation process is as follows: current waveform: one-way pulse or two-way square wave, pulse waveform frequency: 50Hz-1500Hz; ...

Embodiment 1

[0072] This example provides a method for preparing a high-temperature-resistant composite coating containing rare earth aluminates. This method is used to prepare a high-temperature-resistant composite coating containing rare earth aluminates on the surface of an alloy part substrate. The specific details are as follows:

[0073] Step 1: Perform micro-arc oxidation treatment on the alloy part substrate, and the thickness of the film layer is 18 μm;

[0074] The micro-arc oxidation process is: the current waveform is a bidirectional square wave, the pulse waveform frequency is 180Hz; the forward current density is 240A / dm 2 ;Negative current density is 70A / dm 2 ; The positive duty cycle is 35%, the negative duty cycle is 30%; the micro-arc oxidation time is 18 min; the temperature of the micro-arc oxidation bath is 25°C.

[0075] Step 2: using an atmospheric plasma spraying process to prepare a layer of metal bonding layer on the micro-arc oxidation film layer treated in step...

Embodiment 2

[0092] This example provides a method for preparing a high-temperature-resistant composite coating containing rare earth aluminates. This method is used to prepare a high-temperature-resistant composite coating containing rare earth aluminates on the surface of an alloy part substrate. The specific details are as follows:

[0093] Step 1: Perform micro-arc oxidation treatment on the alloy part substrate, and the film thickness is 20 μm;

[0094] The micro-arc oxidation process is: current waveform: bidirectional square wave, pulse waveform frequency 300Hz; forward current density 200A / dm 2 ;The negative current density is 50A / dm 2 ; The positive duty cycle is 35%, and the negative duty cycle is 40%; the micro-arc oxidation time is 18 minutes; the micro-arc oxidation bath temperature: 30°C.

[0095] Step 2: using an atmospheric plasma spraying process to prepare a layer of metal bonding layer on the micro-arc oxidation film layer treated in step 1;

[0096] The composition of...

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Abstract

The invention relates to a high-temperature-resistant composite coating containing rare earth aluminate and a preparation method of the high-temperature-resistant composite coating, which belong to the technical field of preparation of thermal protection coatings. The invention discloses a high-temperature-resistant composite coating containing rare earth aluminate which sequentially comprises a micro-arc oxidation film layer, a metal bonding layer and a rare earth aluminate ceramic layer along the direction far away from the surface of a substrate. The high-temperature-resistant composite coating containing the rare earth aluminate is obtained by firstly carrying out micro-arc oxidation treatment on a substrate and then sequentially preparing a metal bonding layer and a rare earth aluminate ceramic layer on a micro-arc oxidation film layer by adopting an atmospheric plasma spraying process. The problems that in the prior art, a spraying coating of an alloy part substrate generates large deformation, binding force is insufficient, and high-temperature erosion resistance is not achieved are solved, the deformation risk of the substrate is reduced, meanwhile, the binding force of the substrate and a coating interface is guaranteed, and high-temperature erosion resistance is achieved.

Description

technical field [0001] The invention relates to the technical field of high-temperature-resistant and anti-scouring coatings, in particular to a high-temperature-resistant composite coating containing rare earth aluminates and a preparation method thereof. Background technique [0002] In aerospace vehicles, there are many high-temperature service parts, such as alloy parts at the tail nozzle of the booster. High-temperature conditions, such as the booster tail nozzle is a high-temperature and high-pressure gas flow field and Al 2 o 3 Particles erode and scour the environment, so it is necessary to prepare a high-temperature and anti-scour coating on the surface of the fairing to prevent high temperature, high pressure and high-speed airflow from being scoured without being burned through. [0003] The traditional solution is to change the fairing to a high-temperature alloy material, and at the same time add carbon-carbon composite materials to the air-flow scoured surfac...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C28/00C25D11/02C25D11/26C23C4/02C23C4/073C23C4/11
CPCC23C4/134C23C4/02C23C4/073C23C4/11C25D11/026C25D11/26C23C28/3215C23C28/3455C23C28/345Y02T50/60
Inventor 田伟智高鑫郭嘉仪杨茗佳史浩伯
Owner BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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