High-entropy alloy resistant to high-temperature oxidation, thermal barrier coating and preparation method thereof

A high-temperature oxidation-resistant, high-entropy alloy technology, applied in metal material coating technology, coating, fusion spraying, etc., can solve the problems of unreachable high-entropy alloys and unspecified application occasions

Active Publication Date: 2020-10-23
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In Chinese patents CN104711458A and CN101724768A, Pt, Pd and rare earth elements are used to improve the oxidation resistance of the bonding layer material CoNiCrAl, but its composition has not yet re...

Method used

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  • High-entropy alloy resistant to high-temperature oxidation, thermal barrier coating and preparation method thereof
  • High-entropy alloy resistant to high-temperature oxidation, thermal barrier coating and preparation method thereof
  • High-entropy alloy resistant to high-temperature oxidation, thermal barrier coating and preparation method thereof

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preparation example Construction

[0034] In this embodiment, the preparation method of the barrier coating comprises the following steps:

[0035] Step 1: According to the composition of the bonding layer alloy, calculate the demand for pure metal and intermediate alloy raw materials, and prepare materials;

[0036]Step 2: Put the material in a vacuum electric arc furnace for melting to obtain an AlCoCrFeNiTaHfY high-entropy alloy ingot; the molar content of each element in the AlCoCrFeNiTaHfY high-entropy alloy is: Al 16-22%, Co 14-20%, Cr 14-20%, Fe 5-8%, Ni 38-45%, Ta 1-2%, Hf 0.02-0.1%, and Y 0.2-0.5%.

[0037] The electric arc furnace adopts non-consumable vacuum tungsten arc furnace, equipped with water-cooled copper crucible, and the electric arc furnace is vacuumed to 5×10 before melting -3 Below Pa, feed Ar gas to keep the air pressure in the electric arc furnace at 0.4-0.6 MPa to prevent excessive volatilization of metals under the arc.

[0038] The electrode voltage is 30-50V, and the current is 5...

Embodiment 1

[0053] Calculate the alloy composition 18.00Al-16.12Co-16.12Cr-6.16Fe-42.25Ni-1Ta-0.05Hf-0.3Y (mole percent) to obtain the weighted melting point T of the alloy m , mixing entropy ΔS mix , Mixing enthalpy ΔH mix , atomic size difference δ, parameter Ω, and valence electron concentration VEC are listed in Table 1. NiCoCrAlY (composition 40.95Ni-19.74Co-16.54Cr-22.49Al-0.28Y, mole percent) is listed as a comparison. 18.00Al-16.12Co-16.12Cr-6.16Fe-42.25Ni-1Ta-0.05Hf-0.3Y alloy satisfies ΔS mix ≥1.5R (R is the ideal gas constant), parameter Ω>1.1, ΔH mix It is between (-15~3.2) kJ / mol, so it can be called a high-entropy alloy.

[0054] Table 1 Calculation of relevant parameters of high-entropy alloys

[0055]

Embodiment 2

[0057] Preparation of alloy ingots, alloy powders and thermal barrier coatings. Put the raw materials Al, Co, Cr, Fe, Ni, Hf, Ta (all with a purity of 99.9wt% and above) and Al-Y master alloy in 95% absolute ethanol for 10 minutes of ultrasonic cleaning to remove the oily impurities on the surface Afterwards, dry in a drying oven at 50°C. The high-entropy alloy is composed of 18.00Al-16.12Co-16.12Cr-6.16Fe-42.25Ni-1Ta-0.05Hf-0.3Y (mole percent), and the raw materials are weighed and batched with an electronic balance with an accuracy of 0.001g. A non-consumable vacuum electric arc furnace was used for smelting, and a total of 6 alloy ingots of about 50 g were smelted. Put the proportioned materials in the water-cooled copper crucible according to the melting point from low to high and from bottom to top. First use the mechanical pump to evacuate to 5Pa, and then use the molecular pump to continue to evacuate to 5×10 -3 Pa below, then filled with high-purity argon so that th...

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Abstract

The invention provides a high-entropy alloy resistant to high-temperature oxidation, a thermal barrier coating and a preparation method thereof. The AlCoCrFeNiTaHfY high-entropy alloy is prepared by adding alloy elements Fe, Ta and Hf into NiCoCrAlY. The designed high-entropy alloy contains Fe and Hf and has high Ta content, the configurational entropy of the high-entropy alloy is higher than 1.5R, and the high-entropy alloy has the general characteristics of high-entropy alloy. The alloy is simple in phase structure and is of a BCC and FCC double-phase structure without complicated intermetallic compound precipitated phases. Compared with the NiCoCrAlY, the thermal barrier coating provided with the high-entropy alloy as a bonding layer exhibits a lower heat generation oxide increase rateunder a 1,150 DEG C cyclic oxidation condition; an oxide layer of the high-entropy alloy is uniform and dense and is well combined with an alloy substrate; and the high-entropy alloy has the potentialof serving as a bonding layer material.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to a high-entropy alloy resistant to high temperature oxidation, a thermal barrier coating and a preparation method of the thermal barrier coating. Background technique [0002] Thermal barrier coatings usually refer to thermal protective coatings deposited on the surface of gas turbine superalloys with good thermal insulation effects. Thermal barrier coatings are usually composed of a high-temperature oxidation-resistant alloy bonding layer and a ceramic layer with heat-insulating effects, which can reduce the working temperature of the substrate, slow down high-temperature oxidation and corrosion, and are of great significance for ensuring the long-term service of the hot end parts of the gas turbine major. Among them, the bonding layer is an important part of the thermal barrier coating. When serving at high temperature, a thin layer of heat-generated oxide tha...

Claims

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Application Information

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IPC IPC(8): C22C30/00B22F9/08C23C4/073C23C4/11C23C4/134
CPCC22C30/00B22F9/082C23C4/073C23C4/11C23C4/134
Inventor 古立建陈爱英刘芳何美凤李翔
Owner UNIV OF SHANGHAI FOR SCI & TECH
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