A kind of preparation method of silicide coating on the surface of tzm alloy sheet

A silicide and sheet technology, which is applied in the field of preparation of silicide coatings on the surface of TZM alloy sheets, can solve the problems of weak coating adhesion, large coating brittleness, and coating peeling, so as to improve mechanical properties and avoid a large number of The effect of dissolving and improving bond strength

Active Publication Date: 2020-12-08
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, MoSi 2 The coating is brittle and prone to stress and cracks during use
Since TZM alloy and MoSi 2 The coefficient of thermal expansion is different, so the bonding force of the coating is not strong, and the phenomenon of coating peeling often occurs in engineering use.

Method used

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  • A kind of preparation method of silicide coating on the surface of tzm alloy sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: First, the surface of a TZM alloy sheet with a thickness of 4 mm is polished, cleaned with alcohol and dried, and then a pure Al element layer with a thickness of 15 μm is sputtered on the molybdenum alloy by magnetron sputtering. The mass percentage of the alloy powder composed of Mo 52%, Nb 11%, Al 4.5%, and the balance of Si was ball-milled, the ball-milling time was 22h, and the speed was 250r / min; using CO 2 Laser, the alloy powder is clad on the TZM alloy sheet sputtered with pure Al element layer by the synchronous powder feeding method, the powder feeding speed is 6g / min, the argon flow rate is 7L / min, the laser power is 1.2kW, and the scanning speed is 10mm / s.

[0028] The bonding strength between the substrate and the coating was measured by experiments to be 7.8MPa. Compared with Comparative Example 1, the bonding strength between the substrate and the coating was significantly improved under the same laser process parameters. figure 1 This is the ...

Embodiment 2

[0029] Example 2: First, the surface of a TZM alloy sheet with a thickness of 3 mm is polished, and then a pure Al element layer with a thickness of 10 μm is sputtered on the TZM alloy by magnetron sputtering. The alloy powder with the mass percentage composition of Mo 58%, Nb 8.0%, Al 5.5%, and the balance Si is ball-milled, the ball-milling time is 20h, and the rotation speed is 300r / min; using CO 2 Laser, the alloy powder is clad on the TZM alloy sheet sputtered with pure Al element layer by the synchronous powder feeding method, the powder feeding speed is 6g / min, the argon gas flow rate is 7L / min, the laser power is 1.0kW, and the scanning speed is 6mm / s. The bonding strength between the substrate and the coating was measured to be 8.1 MPa through experiments.

Embodiment 3

[0030] Example 3: First, the surface of a TZM alloy sheet with a thickness of 3 mm is polished, and then a pure Al element layer with a thickness of 10 μm is sputtered on the TZM alloy by magnetron sputtering. The mass percentage of alloy powder composed of Mo 63%, Nb 6.5%, Al 3.5%, and the balance of Si was ball-milled for a long time, the ball-milling time was 20h, and the speed was 300r / min; CO 2 Laser, the alloy powder is clad on the TZM alloy sheet sputtered with pure Al element layer by the synchronous powder feeding method, the powder feeding speed is 6g / min, the argon flow rate is 7L / min, the laser power is 1.2kW, and the scanning speed is 10mm / s. The bond strength between the substrate and the coating was measured to be 7.7MPa.

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Abstract

The invention belongs to the technical field of remanufacturing of refractory metals, and in particular relates to a method for preparing a silicide coating on the surface of a TZM alloy sheet. A pure Al element layer with a thickness of 10-20 μm is sputtered on the surface of the TZM alloy sheet, and then the TZM alloy sheet, pure Al element layer, MoSi 2 The powder coating is combined to obtain a silicide coating with excellent mechanical properties and a good combination with the TZM alloy sheet. Beneficial effect: the pure Al element layer sputtered in the present invention is on TZM alloy and MoSi 2 Segregation between coating interfaces can improve TZM alloy sheets and MoSi 2 Cohesion between coatings, reducing MoSi 2 The peeling of the coating; on the other hand, using a lower laser power of 1.0-1.5kW to prepare MoSi by cladding on the TZM alloy sheet 2 Alloy coating, which can avoid a large amount of dissolution of the matrix TZM alloy and improve MoSi 2 Comprehensive performance of the coating.

Description

technical field [0001] The invention relates to the technical field of remanufacturing of refractory metals, in particular to a preparation method of a silicide coating on the surface of a TZM alloy sheet. Background technique [0002] TZM is a typical molybdenum-based alloy with high melting point, small thermal expansion coefficient, high strength, high elastic modulus, good electrical and thermal conductivity, strong corrosion resistance and good high-temperature mechanical properties. It is widely used in military industry, aerospace technology and energy. There are already a wide range of applications in the field of equipment. However, the high temperature oxidation resistance of TZM alloys is not good, which affects the long-term effective use under high temperature conditions. [0003] The current method to improve the high temperature oxidation performance of TZM alloy is to add molybdenum silicide coating. MoSi 2 It is a typical high temperature alloy thermal ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C23C14/35C23C14/16C23C28/00
CPCC23C14/165C23C14/35C23C24/10C23C28/322C23C28/34
Inventor 孙顺平朱九楼张扬胡益丰李小平
Owner JIANGSU UNIV OF TECH
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