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High-temperature alloy oxidation-resistance and corrosion-resistant protective coating

A technology of protective coating and superalloy, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve blank and other problems, and achieve the effect of convenient operation, easy realization and high efficiency

Inactive Publication Date: 2016-08-10
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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  • High-temperature alloy oxidation-resistance and corrosion-resistant protective coating
  • High-temperature alloy oxidation-resistance and corrosion-resistant protective coating
  • High-temperature alloy oxidation-resistance and corrosion-resistant protective coating

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; ④Preparation of protective coating: Weigh it accurately according to the amount, and the proportion of the protective coating is as follows: 5% Cr powder, 10% Al powder, 6% NH4Cl (analytical pure), 1% Y2O3 powder, the rest is Al 2 o 3 powder (≤250 mesh); ⑤Ball milling: Put the prepared protective coating in a ball mill and grind it for 1-3 hours to make the composition uniform and to refine the grains, and the particles of the penetrating agent should be refined to no more than 200 mesh; ⑥Drying: Put the ball-milled protective coating in an oven at 100°C for 1 hour and then dry it; ⑦Embedding: Put the dried protective coating into a corundum crucible, and place the The samples or w...

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; ④Preparation of protective coating: Weigh it accurately according to the amount, and the proportion of the protective coating is as follows: 8% Cr powder, 15% Al powder, 8% NH4Cl (analytical pure), 1.5% Y2O3 powder, the rest is Al 2 o 3 powder (≤250 mesh); ⑤Ball milling: Put the prepared protective coating in a ball mill and grind it for 1-3 hours to make the composition uniform and to refine the grains, and the particles of the penetrating agent should be refined to no more than 200 mesh; ⑥Drying: Put the ball-milled protective coating in an oven at 120°C for 40 minutes and then dry it; ⑦Embedding: Put the dried protective coating into a corundum crucible, and put the The samples o...

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 running water, and then dry it for use; ④Preparation of protective coating: Weigh it accurately according to the amount, and the proportion of the protective coating is as follows: 10% Cr powder, 20% Al powder, 10% NH4Cl (analytical pure), 2% Y2O3 powder, the rest is Al 2 o 3 powder (≤250 mesh); ⑤Ball milling: Put the prepared protective coating in a ball mill and grind it for 1-3 hours to make the composition uniform and to refine the grains, and the particles of the penetrating agent should be refined to no more than 200 mesh; ⑥Drying: Put the ball-milled protective coating in an oven at 150°C for 0.5h and then dry it; ⑦Embedding: Put the dried protective coating into a corundum crucible, and put Embed the samples or w...

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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 nickel-based superalloy anti-oxidation and corrosion-resistant protective coating and a preparation process thereof. 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 in improving its high-temperature oxidation properties, and will significantly reduce its mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(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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