FeCrAl/Ta alloy coating and preparation method thereof

A kind of alloy coating and coating technology, which is applied in the direction of metal material coating process, coating, vacuum evaporation plating, etc., can solve the problems of coating peeling, substrate deformation, deterioration of substrate mechanical properties and film-base interface bonding, etc. Achieve the effect of dense and uniform structure and improve service performance

Active Publication Date: 2022-06-24
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] However, the FeCrAl coating is directly deposited on the surface of the Zr alloy. Since the Fe-Zr eutectic temperature is only 928°C, when a dehydration accident occurs, the cladding temperature can reach 1200°C. During the high-temperature water vapor oxidation process, the coating Severe interdiffusion with matrix elements will occur. In the interdiffusion zone, due to the dissolution of the Fe-Zr eutectic and the Kirkendall effect, a large number of cavities will be formed, which will seriously deteriorate the mechanical properties of the matrix and the bonding of the film-base interface, and even cause matrix deformation and coating peeling off.

Method used

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  • FeCrAl/Ta alloy coating and preparation method thereof
  • FeCrAl/Ta alloy coating and preparation method thereof
  • FeCrAl/Ta alloy coating and preparation method thereof

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preparation example Construction

[0033] A preparation method of FeCrAl / Ta alloy coating, comprising the following steps:

[0034] Step 1: Grind and polish the alloy base to remove the oxide layer on its surface.

[0035] The polishing and grinding method is as follows: the zirconium alloy substrate is ground by the "cross" grinding method, and the 600, 1000, 1500, and 2000-grit sandpapers are sequentially ground, and then polished on a polishing machine, and the remaining surfaces are sequentially ground with 600, 1000, and 1500-grit sandpaper. , grind off the surface oxide layer until the surface has no scratches.

[0036] The alloy matrix is ​​a zirconium alloy, a steel matrix or a titanium alloy.

[0037] Step 2: Perform ultrasonic cleaning on the ground and polished alloy substrate in Step 1.

[0038] Specifically, take a single-side polished alloy substrate, ultrasonically clean it in acetone and ethanol for 10 minutes in turn, and then dry it to ensure that the surface of the substrate is clean and fr...

Embodiment 1

[0048] Step 1: Sandpaper and polish the zirconium alloy substrate.

[0049] Step 2: The single-sided polished zirconium alloy substrate was ultrasonically cleaned in acetone and ethanol for 10 minutes, and dried with a hair dryer.

[0050] Step 3: Fix the zirconium alloy base on the base plate, and then automatically accompany it into the vacuum coating chamber. The vacuum degree of the background should be lower than 4.0×10 before deposition. -4 Pa, and etching for 5min, the etching power is 200W.

[0051] Step 4: A Ta transition layer and a FeCrAl layer are sequentially sputtered on the zirconium alloy base by the method of magnetron sputtering, and after successively sputtering and deposited to a preset thickness, the FeCrAl / Ta alloy coating is obtained by cooling to room temperature.

[0052] Among them, the purity of FeCrAl alloy target is 99.9wt.%, the atomic percentage of Fe:Cr:Al is 79:10:11at.%, the sputtering is performed with a DC power supply power of 200W, the pu...

Embodiment 2

[0056] Step 1: Sand and polish the steel substrate.

[0057] Step 2: The single-sided polished steel substrate was ultrasonically cleaned in acetone and ethanol for 10 minutes, and dried with a hair dryer.

[0058] Step 3: Fix the steel substrate on the base plate, and then automatically accompany it into the vacuum coating chamber. The vacuum degree of the background should be lower than 4.0×10 before deposition. -4 Pa, and etching for 5min, the etching power is 200W.

[0059] Step 4: A Ta transition layer and a FeCrAl layer are sequentially sputtered and deposited on the steel substrate by the method of magnetron sputtering, and after being sequentially sputtered and deposited to a preset thickness, the FeCrAl / Ta alloy coating is obtained by cooling to room temperature.

[0060] Among them, the purity of FeCrAl alloy target is 99.9wt.%, the atomic percentage of Fe:Cr:Al is 74:15:11at.%, the sputtering is performed with a DC power supply power of 200W, the purity of the Ta t...

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Abstract

The invention discloses a FeCrAl/Ta alloy coating and a preparation method thereof. The FeCrAl/Ta alloy coating comprises a Ta transition layer and a FeCrAl layer deposited on the surface of the Ta transition layer, and the atomic percent of the chemical components Fe: Cr: Al of the FeCrAl coating is 79: 10: 11 at%. The FeCrAl/Ta alloy coating is prepared on the polished zirconium alloy matrix by adopting a magnetron sputtering method, the Ta transition layer is deposited between the FeCrAl coating and the zirconium alloy matrix by controlling the deposition sequence of the Ta target and the FeCrAl alloy target, the middle transition layer prepared by the method is smooth in surface, few in defect and small in influence on the structure of the upper-layer coating, the interface of the double-layer coating is clear and stable, and the service life of the middle transition layer is prolonged. The film-substrate interface bonding performance is facilitated, and the obtained film is uniform in component and compact in structure; and the Ta intermediate transition layer is added, so that the service correlation of the FeCrAl coating can be effectively improved.

Description

technical field [0001] The invention relates to the field of metal surface modification, in particular to a FeCrAl / Ta alloy coating and a preparation method thereof. Background technique [0002] FeCrAl alloys are widely used in aerospace, military, nuclear reactors and other fields due to their excellent high temperature oxidation resistance and mechanical properties. During the high temperature oxidation process, the Cr and Al elements in the alloy can quickly form dense Cr on the surface of the sample. 2 O 3 and Al 2 O 3 The oxide layer prevents the further erosion of oxygen elements to the interior, showing excellent resistance to high temperature oxidation. Compared with the current zirconium alloy cladding materials, the oxidation kinetic rate constant of FeCrAl alloy is reduced by 3 to 5 orders of magnitude, while maintaining good high temperature mechanical properties. Therefore, it is listed as a candidate material for zirconium alloy cladding coating of reacto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/16C23C14/02C22C38/18C22C38/06
CPCC23C14/352C23C14/165C23C14/022C22C38/06C22C38/18Y02E30/30
Inventor 王亚强王亚恒张金钰吴凯刘刚孙军
Owner XI AN JIAOTONG UNIV
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