A high-temperature alloy anti-oxidation and corrosion-resistant protective coating and penetrating agent

A protective coating and high-temperature alloy technology, which is applied in the field of nickel-based superalloy anti-oxidation and corrosion-resistant protective coating penetrating agents, can solve problems such as blanks, and achieve the effects of convenient operation, stable and reliable preparation process, and easy realization

Inactive Publication Date: 2018-06-19
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the preparation technology and application of high temperature and corrosion resistant Cr-Al-Y co-infiltration layer prepared on the surface of nickel-based superalloy by diffusion infiltration method are still blank.

Method used

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  • A high-temperature alloy anti-oxidation and corrosion-resistant protective coating and penetrating agent
  • A high-temperature alloy anti-oxidation and corrosion-resistant protective coating and penetrating agent
  • A high-temperature alloy anti-oxidation and corrosion-resistant protective coating and penetrating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] ①Surface pretreatment: remove oxide scales and adherents on the surface of the nickel-based alloy sample or workpiece to keep the surface of the sample clean; Soak for 15 minutes; ③Water washing: Rinse the sample or workpiece after alkali washing with running water, and then dry it for use; The weight percentage is: 5% Cr powder, 10% Al powder, 6% NH 4 Cl (analytically pure), 1% Y 2 o 3 powder, the rest is Al 2 o 3 powder (≤250 mesh); ⑤Ball milling: put the prepared protective coating penetrating agent in a ball mill and grind for 1-3 hours to make the composition uniform and to refine the grains, and refine the penetrating agent particles to No more than 200 meshes; ⑥Drying: place the ball-milled protective coating penetrating agent in an oven at 100°C for 1 hour, and then dry it; ⑦Embedding: Put the dried protective coating penetrating agent into Corundum crucible, and embed the sample or workpiece to be used in the protective coating penetrating agent to keep a ...

Embodiment 2

[0050] ①Surface pretreatment: remove oxide scales and adherents on the surface of nickel-based alloy samples or workpieces to keep the surface of the samples clean; Soak for 12 minutes; ③Water washing: Rinse the sample or workpiece after alkali washing with running water, and then dry it for use; Percent by weight: 8% Cr powder, 15% Al powder, 8% NH 4 Cl (analytical pure), 1.5% Y 2 o 3 powder, the rest is Al 2 o 3 powder (≤250 mesh); ⑤Ball milling: put the prepared protective coating penetrating agent in a ball mill and grind for 1-3 hours to make the composition uniform and to refine the grains, and refine the penetrating agent particles to No more than 200 meshes; ⑥Drying: place the ball-milled protective coating penetrating agent in an oven at 120°C for 40 minutes, and then dry it; ⑦Embedding: Put the dried protective coating penetrating agent into Corundum crucible, and embed the samples or workpieces to be used in the protective coating to keep a certain distance (fo...

Embodiment 3

[0052] ①Surface pretreatment: remove oxide scales and adherents on the surface of the nickel-based alloy sample or workpiece to keep the surface of the sample clean; Soak for 10 minutes; ③Water washing: Rinse the sample or workpiece after alkali washing with flowing water, and then dry it for use; The weight percentage is: 10% Cr powder, 20% Al powder, 10% NH 4 Cl (analytical pure), 2% Y 2 o 3 powder, the rest is Al 2 o 3 powder (≤250 mesh); ⑤Ball milling: put the prepared protective coating penetrating agent in a ball mill and grind for 1-3 hours to make the composition uniform and to refine the grains, and refine the penetrating agent particles to No more than 200 meshes; ⑥Drying: place the ball-milled protective coating penetrating agent in an oven at 150°C for 0.5h and then dry it; Put the sample or workpiece into the corundum crucible, and bury the sample or workpiece to be used in the protective coating penetrating agent, so that a certain distance (for example, at ...

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Abstract

The invention discloses a nickel-based high-temperature alloy oxidation-resistance and corrosion-resistant protective coating and a preparation technique thereof. The protective coating is prepared from three elements including Cr, Al and Y through a pack cementation method. The protective coating is prepared from, by weight, 5-10% of Cr, 10-20% of Al, 1-2% of Y2O3, 6-10% of NH4Cl and the balance Al2O3. The preparation technique comprises the steps that raw materials are weighed accurately according to the weight percentage for preparation of the protective coating; then ball milling and drying are conducted; the raw materials are placed into a crucible after being dried; the raw materials are placed in a muffle furnace after being sealed and charged; and the muffle furnace is heated for 40-60 min to the temperature of 1050-1070 DEG C, heat preservation is conducted at the temperature of 1050-1070 DEG C for 2-3 h, then the temperature is decreased to 600 DEG C with the furnace, the raw materials are taken out and cooled to the room temperature, and finally, the protective coating can be obtained through cleaning and drying. According to the protective coating, a Cr-Al-Y coboronising layer is prepared on the surface of the nickel-based alloy, the technical problem that the nickel-based alloy is poor in high-temperature resistance and corrosion resistance is solved, the preparation technique is stable and reliable, the coating is good in binding force, uniform in structure and compact, and the coating thickness is controllable; and the preparation technique has the advantages of being simple, convenient to operate, high in efficiency, low in cost, easy to implement and the like.

Description

Technical field: [0001] The invention relates to a penetrating agent for an anti-oxidation and corrosion-resistant protective coating of a nickel-based high-temperature alloy and a preparation process for preparing a protective coating by using the penetrating agent. Background technique: [0002] High-temperature alloys such as nickel-based alloys are widely used in aero-engine blades, turbine blades and other components. The service conditions are harsh and they are susceptible to high-temperature oxidation and thermal corrosion. Therefore, superalloys are generally required to have two performance requirements at the same time, that is, excellent high-temperature mechanical properties and high-temperature corrosion resistance, but these two are a pair of contradictions, and it is difficult to balance them. At present, the above-mentioned properties of alloys are mainly improved by alloying and surface modification technologies. The alloying method has certain limitations...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/56
CPCC23C10/56
Inventor 李涌泉耿桂宏秦春李吉林侯俊峰杨少林
Owner BEIFANG UNIV OF NATITIES
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