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Method for preparing refractory element high-entropy alloy coating layer through laser cladding forming

A high-entropy alloy and laser cladding technology, which is applied in the coating process and coating of metal materials, can solve the problems of poor protection effect of inert gas and easy oxidation, etc., and achieves strong industrial applicability, reduced consumption and high efficiency high effect

Inactive Publication Date: 2018-07-27
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the atmosphere protection methods used in laser cladding forming are coaxial or side-axis blowing of inert gas. The inert gas protection effect is not good, and oxidation problems are prone to occur during the forming process.

Method used

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  • Method for preparing refractory element high-entropy alloy coating layer through laser cladding forming
  • Method for preparing refractory element high-entropy alloy coating layer through laser cladding forming
  • Method for preparing refractory element high-entropy alloy coating layer through laser cladding forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 Preparation of an ultrafine spherical MoNbTaW high-entropy alloy powder

[0050] The high-entropy alloy powder is composed of four elements: Mo, Nb, Ta and W, and the molar percentage of alloy elements is Mo:Nb:Ta:W=25:25:25:25.

[0051] Select Mo, Nb, Ta and W powders with a purity higher than 99% and a particle size of 300 meshes, and prepare alloy powders according to the molar percentage of alloy elements Mo:Nb:Ta:W=25:25:25:25. The prepared alloy powder is uniformly mixed in a mixer to obtain unalloyed mechanically mixed powder. Weigh an appropriate amount of the prepared unalloyed mechanically mixed powder according to the ball-to-material ratio of 10:1, put it into a ball mill jar, start vacuuming, and prepare high-entropy alloy powder by high-energy ball milling method in a vacuum environment. The ball milling tank is a vacuum stainless steel tank, and the balls used are stainless steel balls. The ball milling process is a rotating speed of 300 rpm an...

Embodiment 2

[0054] Example 2 Preparation of a superfine spherical high-entropy alloy powder

[0055] The high-entropy alloy powder is composed of four elements: Mo, Nb, Ta and W, and the molar percentage of alloy elements is Nb:Mo:Ta:W=34:34:17:17.

[0056] Select Mo, Nb, Ta and W powders with a purity higher than 99% and particle sizes of 300 meshes, and prepare alloy powders according to the molar percentage of alloy elements Mo:Nb:Ta:W=34:34:17:17. The prepared alloy powder is uniformly mixed in a mixer to obtain unalloyed mechanically mixed powder. Weigh an appropriate amount of the prepared unalloyed mechanically mixed powder according to the ball-to-material ratio of 10:1, put it into a ball mill jar, start vacuuming, and prepare high-entropy alloy powder by high-energy ball milling method in a vacuum environment. The ball milling tank is a vacuum stainless steel tank, and the balls used are stainless steel balls. The ball milling process is a rotating speed of 400 rpm and a ball m...

Embodiment 3

[0063] Embodiment 3 Atmosphere protection device for laser cladding forming technology

[0064] The atmosphere protection device used in laser cladding forming technology, its structure diagram is as follows Figure 5 As shown, the protective gas supply devices 1, 2, and 3 are respectively sealed and connected to the closed casing 11 through two pipelines, and the two pipelines are equipped with valves, 4 is the casing inlet valve, and 12 is the blowing ring inlet valve ; One of the pipes is used to provide protective gas to the shell, and the other pipe is connected to the blowing ring 9 at one end in the shell; the bottom surface of the shell is provided with a liftable sample stage 5; the top surface of the shell is provided with a laser transmission window 10; The vacuum pump 6 and the pressure gauge 7 are connected to the housing 11 respectively, and the housing air release valve 8 is provided on the exhaust pipe outside the housing.

[0065] The air blowing ring (9) is ...

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Abstract

The invention relates to a method for preparing a refractory element high-entropy alloy coating layer through laser cladding forming. The method comprises the following steps that Mo, Nb, Ta and W elements are evenly mixed to prepare high-entropy alloy powder; 2, the high-entropy alloy powder prepared in the step 1 is mixed with an adhesive, the surface of a base material is coated with the mixture, and a cladding prefabricated layer is prepared; 3, the base material treated in the step 2 is placed into an atmosphere protection device, laser cladding forming is carried out, and the base material with the high-entropy alloy coating layer is obtained. The method is easy to operate, the cost is low, refractory elements are effectively prevented from being oxidized at high temperature due to insufficient protection gas, the performance index of the material obtained through laser classing is improved, the consumption of protection gas is reduced, the prepared cladding layer is smooth and compact, the surface is covered with no metal residue, and the method has a wide application prospect in the aspect of high-temperature resistance component preparation.

Description

technical field [0001] The invention relates to the technical field of high-entropy alloy preparation and laser cladding forming, in particular to a method for coating a base material with a refractory element high-entropy alloy by laser cladding forming technology to obtain a high-entropy alloy coating layer. Background technique [0002] High-temperature resistant components such as high-performance aero-engines, aerospace vehicles, rocket engines, and nuclear reactors have been serving in high-temperature and corrosive environments for a long time, which puts forward more stringent requirements for high-temperature resistance, corrosion resistance, strength and toughness of materials. The operating temperature of traditional nickel-based superalloys does not exceed 1150°C, which cannot meet actual needs. Superalloys have good temperature resistance and high temperature strength, excellent fatigue resistance and fracture toughness. They are irreplaceable key materials for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 梁秀兵仝永刚胡振峰陈永雄漆陪部张志彬柳建周志丹
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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