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Formula and preparation method of pseudo high-entropy alloy coating

A high-entropy alloy, coating technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of reducing laser energy density, unsuitable shape, low growth rate, etc., and it is easy to achieve the element ratio. Conditioning, increasing possibility, tissue homogenizing effect

Active Publication Date: 2018-07-24
MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2015, A.Inoue et al. reported that the Zr-based pseudo high-entropy amorphous alloy cast by copper mold exhibited high nucleation speed, low growth speed, high mechanical strength, good ductility and corrosion resistance. characteristics, but these characteristics are difficult to have simultaneously in traditional high-entropy glassy alloys
The method of laser cladding preset powder coating is easy to cause thickness differences, resulting in uneven structure, thickness and composition of the coating, and is not suitable for workpieces with complex shapes
During coaxial powder feeding, the attenuation effect of the powder flow on the beam energy in laser cladding reduces the laser energy density
In addition, when the fine particles of nanometer level are fed coaxially, the powder loss is serious

Method used

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Embodiment 1

[0031] The invention relates to a high-hardness corrosion-resistant Fe 主 The preparation method of Co Ni Cr Al Ti Si pseudo high-entropy alloy coating comprises the following steps:

[0032] Step 1. Mix the elemental powders of seven elements including Fe, Co, Ni, Cr, Al, Ti and Si evenly according to the equal atomic ratio;

[0033] Step 2. Add a binder to the mixed powder obtained in step 1, and mix the fine raw material powder by ball milling to form a slurry. The slurry is made into a certain size precursor powder through a spray drying device, and then sintered and sieved Produce powders with a size between 5 and 35 μm;

[0034] Step 3. Add the agglomerated and sintered powder obtained by screening in step 2 into the powder feeder, and use atmospheric supersonic flame spraying (HVAF) technology, air pressure 100PSI, gas pressure 90PSI, nitrogen flow rate 30slpm, hydrogen flow rate 30slpm, spraying distance 250mm , forming a preset coating with a thickness of 400 μm on t...

Embodiment 2

[0043] The invention relates to a high-hardness corrosion-resistant Fe 主 The preparation method of Co Ni Cr Al Ti Si pseudo high-entropy alloy coating comprises the following steps:

[0044] Step 1. Mix the elemental powders of seven elements uniformly according to the following atomic percentage content, the content of Fe is 5 at%, and the remaining 95 at% of Co Ni Cr Al Ti Si is evenly divided;

[0045] Step 2. Add a binder to the mixed powder obtained in step 1, and mix the fine raw material powder by ball milling to form a slurry. The slurry is made into a certain size precursor powder through a spray drying device, and then sintered and sieved Produce powders with a size between 5 and 35 μm;

[0046] Step 3. Add the agglomerated and sintered powder obtained by screening in step 2 into the powder feeder, and use atmospheric supersonic flame spraying (HVAF) technology, air pressure 85PSI, gas pressure 80PSI, nitrogen flow rate 15slpm, hydrogen flow rate 15slpm, spraying di...

Embodiment 3

[0050] The invention relates to a high-hardness corrosion-resistant Fe 主 The preparation method of Co Ni Cr Al Ti Si pseudo high-entropy alloy coating comprises the following steps:

[0051] Step 1. Mix the elemental powders of the seven elements uniformly according to the following atomic percentage content, the content of Fe is 10 at%, and the remaining 90 at% of Co Ni Cr Al Ti Si is evenly divided;

[0052] Step 2. Add a binder to the mixed powder obtained in step 1, and mix the fine raw material powder into a slurry, and use a spray drying device to make the slurry into a certain size precursor powder, and then go through degreasing, sintering, Sieve out powders with a size between 5 and 35 μm;

[0053] Step 3. Add the agglomerated and sintered powder obtained by screening in step 2 into the powder feeder, and use atmospheric supersonic flame spraying (HVAF) technology, air pressure 90PSI, gas pressure 90PSI, nitrogen flow rate 20slpm, hydrogen flow rate 20slpm, spraying ...

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Abstract

The invention discloses a formula and preparation method of a pseudo high-entropy alloy coating. The method comprises the steps that elementary substance powder of seven types of elements, namely Fe,Co, Ni, Cr, Al, Ti and Si, is adopted as raw materials, and agglomeration and sintering are conducted, so that the powder grain size applicable to high velocity air fuel spraying is formed, wherein the atomic percent content of the Fe ranges from 5% to 15%, and the remaining atomic percents are equally divided by the remaining six types of elements; the Fe(P), Co, Ni, Cr, Al, Ti and Si pseudo high-entropy alloy coating is prepared through a method combining high velocity air fuel (HVAF) spraying and the laser cladding technology, wherein the Fe serves as the principal element, the content of the Fe, by atomic percentage, ranges from 40% to 60%, and the content sum of the remaining solute elements, by atomic percentage, is greater than or equal to 5% and less than or equal to 20%. The pseudo high-entropy alloy coating achieves good mechanical performance and is also excellent in corrosion resistance.

Description

technical field [0001] The invention relates to the field of coating materials, in particular to a pseudo high-entropy alloy coating formula and a coating preparation method thereof. Background technique [0002] In 2014, Professor A.Inoue proposed the concept of pseudo high-entropy alloys, which changed the principle of equiatomic ratio or close to equiatomic ratio of high-entropy alloys, and stipulated the atomic ratio of main elements and solute elements, that is, the atomic ratio of main elements is in 40-60 at%, and each solute element is between 5-20 at%, aiming to prepare a new type of multi-component alloy. In 2015, A.Inoue et al. reported that the Zr-based pseudo high-entropy amorphous alloy cast by copper mold exhibited high nucleation speed, low growth speed, high mechanical strength, good ductility and corrosion resistance. However, these properties are difficult to possess simultaneously in traditional high-entropy glassy alloys. It can be seen that pseudo hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/067C23C4/18C23C24/10
CPCC23C4/067C23C4/129C23C4/18C23C24/103
Inventor 陈小明黄欢欢吴燕明赵坚伏利周夏凉毛鹏展
Owner MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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