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A method and device for preparing a gradient metal-ceramic composite coating on the surface of a deflector

A metal-ceramic composite and deflector technology, applied in metal material coating process, coating, air transportation, etc., can solve the problems of oxidation, embrittlement, low melting point metal phase over-melting, etc., to achieve high bonding strength, thermal conductivity Good and excellent thermal insulation

Active Publication Date: 2017-12-08
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the purposes of the present invention is to feed the high-melting-point ceramic powder and the low-melting-point metal powder into different temperature regions of the plasma flame to ensure that the two powders reach their respective melting points, and then spray them onto the substrate at supersonic speed after uniform mixing to form Coating, thus solving the problem of oxidation and embrittlement caused by the over-melting of the low-melting point metal phase when the gradient thermal barrier coating is prepared by the "metal / ceramic hybrid method" in the traditional technology

Method used

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  • A method and device for preparing a gradient metal-ceramic composite coating on the surface of a deflector
  • A method and device for preparing a gradient metal-ceramic composite coating on the surface of a deflector
  • A method and device for preparing a gradient metal-ceramic composite coating on the surface of a deflector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Step 1. Adjust the distance between the injection port of the supersonic plasma spraying system and the substrate to 350mm;

[0059] Step 2. Introduce the alloy bottom layer raw material powder NiCoCrAlY into the main airflow injection path of the supersonic plasma spraying system through the metal powder channel, adjust the ratio of nitrogen and argon in the main airflow to 5%, the flow rate of the main airflow is 80L / min, and the spraying current For 350A, the alloy bottom layer raw material powder NiCoCrAlY is sprayed onto the substrate through the main air flow to form the alloy bottom layer on the substrate;

[0060] Step 3. Adjust the distance between the injection port of the supersonic plasma spraying system and the substrate to be 65mm;

[0061] Step 4. Introduce the intermediate layer raw material powder YSZ into the main airflow injection path of the supersonic plasma spraying system through the ceramic powder channel, set the speed of powder delivery to 20g / ...

Embodiment 2

[0065] Step 1. Adjust the distance between the injection port of the supersonic plasma spraying system and the substrate to 550mm;

[0066]Step 2. Introduce the alloy bottom layer raw material powder NiCoCrAlY into the main airflow injection path of the supersonic plasma spraying system through the metal powder channel, adjust the ratio of nitrogen and argon in the main airflow to 20%, the flow rate of the main airflow is 160L / min, and the spraying current For 450A, the alloy bottom layer raw material powder NiCoCrAlY is sprayed onto the substrate through the main air flow to form the alloy bottom layer on the substrate;

[0067] Step 3. Adjust the distance between the injection port of the supersonic plasma spraying system and the substrate to be 95mm;

[0068] Step 4. Introduce the middle layer raw material powder YSZ into the main airflow injection path of the supersonic plasma spraying system through the ceramic powder channel, set the speed of powder delivery to 100g / min,...

Embodiment 3

[0072] Step 1. Adjust the distance between the injection port of the supersonic plasma spraying system and the substrate to 420mm;

[0073] Step 2. Lead the alloy bottom layer raw material powder NiCoCrAlY into the main air flow injection path of the supersonic plasma spraying system through the metal powder channel, adjust the ratio of nitrogen and argon in the main air flow to 15%, the flow rate of the main air flow is 115L / min, and the spraying current For 405A, the alloy bottom layer raw material powder NiCoCrAlY is sprayed onto the substrate through the main air flow to form the alloy bottom layer on the substrate;

[0074] Step 3. Adjust the distance between the injection port of the supersonic plasma spraying system and the substrate to be 85mm;

[0075] Step 4. Introduce the intermediate layer raw material powder YSZ into the main airflow injection path of the supersonic plasma spraying system through the ceramic powder channel, set the speed of powder delivery to 65g / ...

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Abstract

The invention discloses a method for preparing a gradient metal ceramic composite coating on the surface of a bias current plate.The method comprises the steps that bottom layer raw material powder is introduced into a supersonic plasma spraying system, and under the effect of spraying current, the bottom layer raw material powder is sprayed to a matrix through primary airflow; middle layer raw material powder is introduced into the supersonic plasma spraying system, and under the effect of the spraying current, the middle layer raw material powder is sprayed to the matrix through the primary airflow; surface layer raw material powder is introduced into the supersonic plasma spraying system, and under the effect of the spraying current, the surface raw material powder is sprayed to the matrix through the primary airflow.The invention further discloses a device for preparing the gradient metal ceramic composite coating on the surface of the bias current plate.The method and device have the properties such as high temperature corrosion resistance, thermal shock resistance, high temperature erosion resistance, normal temperature salt-spray corrosion resistance and abrasion resistance, and have the advantages that the bonding strength of a bottom layer in the coating is high, and the heat conductivity is good.

Description

technical field [0001] The invention relates to the preparation of an insulating coating, in particular to a method and a device for preparing a gradient metal-ceramic composite coating on the surface of a deflector plate. Background technique [0002] At present, the material of the deflector is mainly aluminum alloy, which is cooled by water cooling. However, the aluminum alloy cooling water channel of this deflector is severely corroded; the maintenance cost is high; the system is complex and heavy. In order to improve the deflector's ability to withstand the high speed, high temperature and strong impact of the gas during aircraft injection, a passivated deflector structure has been proposed in recent years. That is, first use air cooling instead of seawater cooling, which can reduce the weight of the seawater cooling system and the corrosion problems caused by it, and reduce maintenance costs; secondly, enhance the heat insulation on the surface of the deflector plate,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/06
CPCC23C4/06Y02T50/60
Inventor 刘明王海军张伟谭俊姜祎
Owner ACADEMY OF ARMORED FORCES ENG PLA
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