A kind of nickel-based superalloy surface alcrsi slurry infiltration agent and preparation method thereof

A nickel-based superalloy, slurry technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problem of inappropriate slurry viscosity and pH, difficult to control the uniformity of the infiltration layer, and corrosion resistance. Insufficient and other problems, to achieve the effect of improving the uneven thickness of the coating, various forms of addition, and moderate aluminum content

Active Publication Date: 2021-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solid penetrating agent is easy to cause environmental pollution, difficult to control the uniformity of the permeating layer, easy to produce nodules, local aluminum-rich and other disadvantages. Liquid slurry is the best choice, which can achieve partial aluminizing, but the traditional formula of aluminizing slurry There are the following problems: (1) The coating prepared by the traditional AlNi slurry penetration agent has insufficient high temperature oxidation resistance and corrosion resistance; (2) The viscosity and pH of the traditional slurry are not suitable, and after drying on the surface of parts such as superalloy blades, local Problems such as unevenness and knots

Method used

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  • A kind of nickel-based superalloy surface alcrsi slurry infiltration agent and preparation method thereof

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Effect test

Embodiment 1

[0032]First, in terms of mass fraction, prepare component A: 20%, component B: 40% and component C: 40% AlCrSi slurry infiltration agent on the surface of nickel-based superalloy; wherein, component A: 6% AlCl 3 , 6% NH 4 Cl, 10% Cr 2 o 3 and 24% H 3 PO 4 Solution (concentration 85%), the balance is dehydrated alcohol; Component B: 15% CrCl 3 , 30% Al 2 o 3 and 15% H 3 PO 4 solution (concentration 85%), the balance is absolute ethanol; component C: 60% spherical AlCr powder, 30% Si powder, and the balance is spherical Al powder, wherein the content of Al in the AlCrSi powder is 60%.

[0033] Fully mix the above components A, the mixing order is: first add AlCl to part of the absolute ethanol solution 3 , NH 4 Cl, Cr 2 o 3 、H 3 PO 4 solution (concentration 85%), after mixing, add the remaining part of absolute ethanol solution and mix evenly. Then add distilled water to dilute, adjust the component density, pH and viscosity to the required range, and filter after...

Embodiment 2

[0039] First, in terms of mass fraction, prepare component A: 20%, component B: 40% and component C: 40% AlCrSi slurry infiltration agent on the surface of nickel-based superalloy; wherein, component A: 6% AlCl 3 , 7% NH 4 Cl, 12% Cr 2 o 3 and 22% H 3 PO 4 Solution (concentration 85%), the balance is dehydrated alcohol; Component B: 16% CrCl 3 , 32% Al 2 o 3 and 12% H 3 PO 4 Solution (concentration 85%), the balance is absolute ethanol; Component C: 55% spherical AlCr powder, 32% Si powder, and the balance is spherical Al powder, wherein the content of Al in the AlCrSi powder is 60%;

[0040] Fully mix the above components A, the mixing order is: first add AlCl to part of the absolute ethanol solution 3 , NH 4 Cl, Cr 2 o 3 、H 3 PO 4 solution (concentration 85%), after mixing, add the remaining portion of absolute ethanol and mix evenly. After diluting with distilled water, adjust the component density, pH and viscosity to the required range, and filter after sta...

Embodiment 3

[0046] First, in terms of mass fraction, prepare component A: 20%, component B: 40% and component C: 40% AlCrSi slurry infiltration agent on the surface of nickel-based superalloy; wherein, component A: 7% AlCl 3 , 8% NH 4 Cl, 13% Cr 2 o 3 and 22% H 3 PO 4 Solution (concentration 85%), the balance is dehydrated alcohol; Component B: 17% CrCl 3 , 33% Al 2 o 3 and 12% H 3 PO 4 Solution (concentration 85%), the balance is absolute ethanol; component C: 55% spherical AlCr powder, 32% Si powder, and the balance is spherical Al powder, wherein the content of Al in the AlCrSi powder is 60%.

[0047] Fully mix the above components A, the mixing order is: first add AlCl to part of the absolute ethanol solution 3 , NH 4 Cl, Cr 2 o 3 、H 3 PO 4 solution (concentration 85%), after mixing, add the remaining portion of absolute ethanol and mix evenly. After diluting with distilled water, adjust the component density, pH and viscosity to the required range, and filter after sta...

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Abstract

The invention discloses an AlCrSi slurry penetrating agent on the surface of a nickel-based superalloy and a preparation method thereof. The raw materials include three components according to the mass percentage, 18-30% of the liquid component A, and 35-60% of the liquid component Part B, the balance is solid component C. The aluminized slurry of the invention has reasonable compatibility, moderate aluminum content and various addition forms, which not only increases the infiltration speed of aluminum and the thickness of the infiltrated layer, but also ensures the toughness of the infiltrated layer, and improves the mechanical properties. The activators and adhesives used all participate in or promote the reaction during the high-temperature aluminizing process, without harmful residues, ensuring the purity of the aluminized layer and improving the service life of the aluminized coating. The aluminum-chromium-silicon slurry prepared by the invention greatly improves the sulfur corrosion resistance, oxygen corrosion resistance, thermal stability and coating life of the aluminum-chromium-silicon coating; at the same time, the thickness of the coating prepared by the traditional aluminizing agent is improved Inhomogeneity, surface nodules, local aluminum-rich and other defects.

Description

technical field [0001] The invention belongs to the technical field of metal material surface treatment, and in particular relates to an AlCrSi slurry penetration agent for the surface of a nickel-based superalloy and a preparation method thereof. Background technique [0002] The upgrading of the aerospace field requires more advanced and high thrust-to-weight ratio turbine engines, so the requirements for materials are also getting higher and higher. The needs of aero-engines are closely linked with the development of superalloys. At present, the gas inlet temperature of advanced gas turbines can reach 1600°C, and the operating temperature of the blades can reach 1000-1200°C. The high-temperature components of the turbine engine not only bear thermal cycles and mechanical loads, but also suffer from corrosive particles such as sulfates produced by fuel combustion. erosion. Nickel-based superalloys are widely used in turbine engine blades and other fields due to their goo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/20
CPCC23C10/20
Inventor 李瑞迪王悦婷袁铁锤邹亮
Owner CENT SOUTH UNIV
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