Method for repairing silicide coating on surface of Mo alloy sheet

A silicide and thin plate technology, applied in the coating process and coating of metal materials, can solve the problems of poor heat resistance and high temperature oxidation resistance, and the coating is easy to fall off, so as to improve the oxidation resistance and reduce the cost of equipment. , good economic effect

Inactive Publication Date: 2020-05-19
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve pure MoSi 2 The coating is easy to fall off, and the technical problems of heat resistance and high temperature oxidation resistance are not good, and a method for repairing the silicide coating on the surface of Mo alloy sheet is provided

Method used

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  • Method for repairing silicide coating on surface of Mo alloy sheet
  • Method for repairing silicide coating on surface of Mo alloy sheet
  • Method for repairing silicide coating on surface of Mo alloy sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for repairing a silicide coating on the surface of a Mo alloy sheet, comprising the steps of:

[0030] (1) grinding and polishing the peeling part of the Mo alloy plate surface coating with a thickness of 3mm, cleaning and drying with alcohol;

[0031] (2) The mass percentage is composed of 93% MoSi 2 , 2% Nb, 3% Al, 1% Cr, 0.5% W, 0.2% B, 0.3% Ti alloy powders were placed in a star ball mill and mixed for 12 hours, and the ball milling speed was 350r / min to obtain MoSi 2 Main mixed alloy powder; MoSi 2 Powder purity is 99.9%, particle diameter is 1-3μm; Al powder purity is 99%, particle diameter is 3-5μm; Nb powder purity is 95%, particle diameter is 4-5μm; Cr powder purity is 97%, particle diameter The purity of W powder is 99%, and the particle diameter is 2-4μm; the purity of B powder is 98%, and the particle diameter is 3-5μm; the diameter of Ti powder is 96%, and the particle diameter is 4-6μm;

[0032](3) After ball milling, the powder uses ethanol as...

Embodiment 2

[0041] A method for repairing a silicide coating on the surface of a Mo alloy sheet, comprising the steps of:

[0042] (1) grinding and polishing the peeling part of the Mo alloy plate surface coating with a thickness of 3mm, cleaning and drying with alcohol;

[0043] (2) The mass percentage is composed of 92.6% MoSi 2 , 2% Nb, 3% Al, 1.5% Cr, 0.5% W, 0.3% B, 0.1% Ti alloy powders were placed in a star ball mill and mixed for 12 hours, and the ball milling speed was 350r / min to obtain MoSi 2 Main mixed alloy powder; MoSi 2 Powder purity is 99.9%, particle diameter is 1-3μm; Al powder purity is 99%, particle diameter is 3-5μm; Nb powder purity is 95%, particle diameter is 4-5μm; Cr powder purity is 97%, particle diameter The purity of W powder is 99%, and the particle diameter is 2-4μm; the purity of B powder is 98%, and the particle diameter is 3-5μm; the diameter of Ti powder is 96%, and the particle diameter is 4-6μm;

[0044] (3) After ball milling, the powder uses ethan...

Embodiment 3

[0048] A method for repairing a silicide coating on the surface of a Mo alloy sheet, comprising the steps of:

[0049] (1) grinding and polishing the peeling part of the Mo alloy plate surface coating with a thickness of 3mm, cleaning and drying with alcohol;

[0050] (2) The mass percentage is composed of 91% MoSi 2 , 3% Nb, 4% Al, 1% Cr, 0.7% W, 0.2% B, 0.1% Ti alloy powder was placed in a star ball mill and mixed for 12 hours, and the ball milling speed was 350r / min to obtain MoSi 2 Main mixed alloy powder; MoSi 2 Powder purity is 99.9%, particle diameter is 1-3μm; Al powder purity is 99%, particle diameter is 3-5μm; Nb powder purity is 95%, particle diameter is 4-5μm; Cr powder purity is 97%, particle diameter The purity of W powder is 99%, and the particle diameter is 2-4μm; the purity of B powder is 98%, and the particle diameter is 3-5μm; the diameter of Ti powder is 96%, and the particle diameter is 4-6μm;

[0051] (3) After ball milling, the powder uses ethanol as ...

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Abstract

The invention relates to a method for repairing a silicide coating on the surface of a Mo alloy sheet. The method comprises the following steps of first, polishing the surface of a peeling-off part ofthe silicide coating on the surface of the Mo alloy sheet, preparing from the following components in percentage by mass: 2%-5% of Nb powder, 3%-5% of Al powder, 1%-2% of Cr powder, 0.5%-1% of W powder, 0.2%-0.5% of B powder, 0.1%-0.2% of Ti powder, and the balance of MoSi2 powder, and performing ball milling to obtain mixed alloy powder mainly based on MoSi2, then using ethanol as a binder to bepre-arranged and attached to the coating peeling-off part, drying to obtain a pre-arranged coating, and finally performing TIG arc cladding on the pre-arranged coating by using TIG arc welding, thereby obtaining an arc cladding repair coating on the surface of the Mo alloy sheet. The method can improve the interface bonding strength and high temperature oxidation resistance of the repaired coating.

Description

technical field [0001] The invention relates to the technical field of refractory metal silicide coating surface repair, in particular to a method for repairing the silicide coating on the surface of a Mo alloy thin plate. Background technique [0002] As one of the typical refractory metals, Mo alloy has good strength and stability at high temperature, low thermal expansion coefficient, excellent thermal and electrical conductivity, high corrosion resistance and wear resistance, and is an important service material for rocket engine thrust chambers. One, but because Mo alloy has low-temperature brittleness and high-temperature oxidation ability is poor, it cannot achieve stable working efficiency at high temperature, and "catastrophic" oxidation phenomenon will also occur at the same time. Therefore, the scope of use of Mo alloys is limited in engineering. [0003] The manufacturing cost of parts on the rocket is relatively high. Obviously, frequent replacement of parts ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C29/18
CPCC22C29/18C23C24/103
Inventor 孙顺平王斌王洪金张扬刘骁李小平
Owner JIANGSU UNIV OF TECH
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