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Preparation method of surface silicide coating for TZM (Titanium-Zirconium-Molybdenum) alloy sheet

A technology of silicide and thin plate, which is applied in the field of preparation of silicide coating on the surface of TZM alloy thin plate, can solve the problems of high brittleness of the coating, peeling off of the coating, weak coating adhesion, etc., so as to improve the joint strength and avoid a large number of The effect of dissolving and improving mechanical properties

Active Publication Date: 2019-01-25
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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  • Preparation method of surface silicide coating for TZM (Titanium-Zirconium-Molybdenum) 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 was polished, cleaned with alcohol and dried, and then a pure Al element layer with a thickness of 15 μm was sputtered on the molybdenum alloy by magnetron sputtering. Ball mill the alloy powder composed of Mo 52%, Nb11%, Al 4.5%, and the balance Si. The milling time is 22h and the rotation speed is 250r / min; use CO 2 Laser, cladding alloy powder on TZM alloy thin plate sputtered with pure Al element layer by synchronous powder feeding method, powder feeding speed 6g / min, argon flow 7L / min, laser power 1.2kW, scanning speed 10mm / s.

[0028] The bond strength between the substrate and the coating measured by experiments is 7.8MPa. Compared with Comparative Example 1, the bond strength between the substrate and the coating is significantly improved under the same laser process parameters. figure 1 This is the metallographic structure of the cross-section of the silicide coating on the surface of the T...

Embodiment 2

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

Embodiment 3

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

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Abstract

The invention belongs to the technical field of the remanufacturing of refractory metals, and particularly relates to a preparation method of a surface silicide coating for a TZM (Titanium-Zirconium-Molybdenum) alloy sheet. A pure Al element layer with a thickness of 10 mum to 20 mum is sputtered on the surface of the TZM alloy sheet; and next, the TZM alloy sheet, the pure Al element layer and aMoSi2 powder coating are combined together through laser scanning, so as to obtain the silicide coating which is excellent in mechanical property and is further favorably combined with the TZM alloy sheet. The preparation method has the beneficial effects that the sputtered pure Al element layer in the preparation method is subjected to segregation between interfaces of the TZM alloy and the MoSi2coating; the combining power between the TZM alloy sheet and the MoSi2 coating can be improved; the exfoliation of the MoSi2 coating is reduced; on the other hand, the MoSi2 alloy coating is preparedon the TZM alloy sheet in a fusion covering manner by adopting lower laser power of 1.0 kW to 1.5 kW; the massive dissolution on the matrix TZM alloy can be avoided; and the overall performance of the MoSi2 coating is improved.

Description

Technical field [0001] The invention relates to the technical field of remanufacturing of refractory metals, in particular to a method for preparing 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, low thermal expansion coefficient, high strength, high elastic modulus, good electrical and thermal conductivity, strong corrosion resistance and good high-temperature mechanical properties. It is used in military industry, aerospace technology and energy There are already extensive applications in the field of equipment. However, the high temperature oxidation resistance of TZM alloy 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 barrier coating material, wi...

Claims

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Application Information

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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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