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A preparation method of laser cladding forming high-entropy alloy coating layer of refractory elements

A high-entropy alloy and laser cladding technology, applied in metal material coating process, coating and other directions, can solve the problems of poor inert gas protection effect and easy oxidation, and achieve strong industrial practicability, reduce dosage, improve The effect of performance indicators

Inactive Publication Date: 2020-04-07
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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  • A preparation method of laser cladding forming high-entropy alloy coating layer of refractory elements
  • A preparation method of laser cladding forming high-entropy alloy coating layer of refractory elements
  • A preparation method of laser cladding forming high-entropy alloy coating layer of refractory elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 Preparation of an ultra-fine 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 alloying 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 particle sizes of 300 meshes respectively, and prepare alloy powders according to the molar percentage of alloying elements Mo:Nb:Ta:W=25:25:25:25. The formulated alloy powder is uniformly mixed in a mixer to obtain unalloyed mechanical mixed powder. Weigh an appropriate amount of the prepared unalloyed mechanical mixed powder according to the ball-to-battery ratio of 10:1, put it into a ball mill tank, and start vacuuming, and prepare high-entropy alloy powder by high-energy ball milling in a vacuum environment. The ball milling tank is a vacuum stainless steel tank, the balls used are stainless steel balls, and the ball milling process is a rotation speed of 3...

Embodiment 2

[0054] Example 2 Preparation of an ultrafine 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 alloying 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 respectively, and prepare alloy powders according to the molar percentage of alloying elements Mo:Nb:Ta:W=34:34:17:17. The formulated alloy powder is uniformly mixed in a mixer to obtain unalloyed mechanical mixed powder. Weigh an appropriate amount of the prepared unalloyed mechanical mixed powder according to the ball-to-battery ratio of 10:1, put it into a ball mill tank, and start vacuuming, and prepare high-entropy alloy powder by high-energy ball milling in a vacuum environment. The ball milling tank is a vacuum stainless steel tank, the balls used are stainless steel balls, and the ball milling process is 400 revolutions / min and the ba...

Embodiment 3

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

[0064] The atmosphere protection device used for 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 connected to the closed housing 11 through two pipes, and both pipes are provided with valves, 4 is the housing 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 of the shell; the inner 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 respectively connected to the housing 11, and a housing bleed valve 8 is provided on the exhaust pipe outside the housing.

[0065] The side of the blowing ring (9) facing the liftable sample ...

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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 preparing a high-entropy alloy coating layer by coating a refractory element high-entropy alloy with a base material through a laser cladding forming technology. Background technique [0002] High-performance aero-engines, aerospace vehicles, rocket engines and nuclear reactors and other high-temperature-resistant components have been used in high-temperature and corrosive environments for a long time, which puts forward more stringent requirements on the high-temperature resistance, corrosion resistance, strength and toughness of materials. The operating temperature of traditional nickel-based superalloys does not exceed 1150°C, which can no longer meet actual needs. Superalloy has good temperature resistance and high temperature strength, excellent fatigue resistance and fracture toughness. It is an irreplaceable key mat...

Claims

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Application Information

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Patent Type & Authority Patents(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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