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Eutectic alloy, preparation method thereof and application of eutectic alloy as thermal barrier coating bonding layer

A eutectic alloy and alloy technology, which is applied in metal material coating process, coating, mechanical equipment, etc., can solve the problems of weak oxidation resistance, difficulty in meeting higher requirements, and insufficient thermal corrosion resistance.

Active Publication Date: 2022-07-01
EAST CHINA UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, β-(Ni,Pt)Al has excellent oxidation resistance, but its thermal corrosion resistance is insufficient; NiCoCrAlY contains high chromium content, which improves the thermal corrosion resistance of the material, but its oxidation resistance is weak
The existing β-(Ni,Pt)Al and NiCoCrAlY materials as bonding layer materials cannot have high thermal corrosion resistance and oxidation resistance at the same time, and it is difficult to meet the requirements of the next-generation aeroengine thermal barrier coating for bonding layer materials. Higher requirements

Method used

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  • Eutectic alloy, preparation method thereof and application of eutectic alloy as thermal barrier coating bonding layer
  • Eutectic alloy, preparation method thereof and application of eutectic alloy as thermal barrier coating bonding layer
  • Eutectic alloy, preparation method thereof and application of eutectic alloy as thermal barrier coating bonding layer

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preparation example Construction

[0047] The present invention provides the preparation method of the eutectic alloy described in the above technical solution, comprising the following steps:

[0048] The raw materials are mixed according to the atomic number ratio and then smelted and solidified in sequence to obtain a primary eutectic alloy;

[0049] The primary eutectic alloy is repeatedly smelted and solidified to obtain the eutectic alloy.

[0050] According to the invention, the raw materials are mixed according to the atomic number ratio and then smelted and solidified in sequence to obtain the primary eutectic alloy. In the present invention, the raw material is preferably a metal of the corresponding element, and the purity of the metal independently is preferably 99.5% or more, and more preferably 99.6 to 99.9%. In the present invention, the raw materials of each element in the AlCoCrNiPt alloy are preferably particles independently, and the particle size of the particles is preferably 2-5 mm indepe...

Embodiment 1

[0061] The aluminum particles, cobalt particles, chromium particles, nickel particles, and platinum particles with a purity of 99.9% and an average particle size of 3 mm, yttrium particles with a purity of 99.9% and an average particle size of 2 mm and hafnium wires with a purity of 99.9% were used to remove the Ionized water was used as the solvent and the power was 120W for ultrasonic cleaning for 10 minutes, and then ultrasonic cleaning was performed for 10 minutes under the condition that acetone was the solvent and the power was 120W; after drying at 80 °C for 20 minutes, it was used for later use;

[0062] Y: 0.028g (the atomic percentage of the eutectic alloy is 0.05at.%), Hf: 0.057g (the atomic percentage of the eutectic alloy is 0.05at.%), Al: l3.4 g ( The atomic percentage of AlCoCrNiPt alloy is 20 at.%), Ni: 7.5g (the atomic percentage of AlCoCrNiPt alloy is 20 at.%), Co: 7.5g (the atomic percentage of AlCoCrNiPt alloy is 20 at.%) ), Cr: 6.6g (the atomic percentage ...

Embodiment 2

[0064] The eutectic alloy was prepared according to the method of Example 1, except that the amount of raw materials was as follows: Zr: 0.06g (accounting for the atomic percentage of the eutectic alloy: 0.1 at.%), Hf: 0.47g (accounting for the total The atomic percentage of the crystalline alloy is 0.4 at.%), Al: 4.1g (the atomic percentage of the AlCoCrNiPt alloy is 23 at.%), Ni: 6.6g (the atomic percentage of the AlCoCrNiPt alloy is 17 at.%) ), Co: 7.0g (18 at.% in AlCoCrNiPt alloy), Cr: 7.9g (23 at.% in AlCoCrNiPt alloy), Pt: 24.4g (18 at.% in AlCoCrNiPt alloy) The percentage is 19 at.%).

[0065] After the eutectic alloy prepared in Example 1 was longitudinally cut, metallographically prepared and polished, the microstructure and structure were analyzed by scanning and transmission electron microscopes, and the scanning electron microscope backscattered electron diagram was obtained, as shown in the following figure. figure 1 shown. Depend on figure 1 It can be seen th...

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Abstract

The invention belongs to the technical field of bonding layer materials, and particularly relates to a eutectic alloy and a preparation method and application thereof. The eutectic alloy provided by the invention comprises an AlCoCrNiPt alloy and an active element which is dispersed in the AlCoCrNiPt alloy, the AlCoCrNiPt alloy is prepared from the following elements in percentage by atomic number: 18 to 23 at. Percent of Al, 18 to 23 at. Percent of Co, 18 to 23 at. Percent of Cr, 15 to 20 at. Percent of Pt and the balance of Ni. The active element accounts for 0.01 to 0.5 at.% of the atomic number of the eutectic alloy; the eutectic alloy comprises a beta (B2) phase and a gamma '(L12) phase. The eutectic alloy contains high-content Pt which occupies nickel sites in NiAl and Ni3Al, so that the Al / Ni ratio of each crystal face of the alloy is increased, selective oxidation of aluminum oxide is promoted, generation of transient oxides such as nickel oxide is inhibited, and the oxidation resistance of the eutectic alloy is improved. The high-content chromium in the eutectic alloy improves the thermal corrosion resistance of the alloy. The beta (B2) and gamma '(L12) double-phase structure provides a large number of channels for rapid diffusion of Al, rapid formation of a single Al2O3 oxidation film is promoted, and therefore the oxidation resistance of the eutectic alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of adhesive layer materials, and in particular relates to a eutectic alloy and a preparation method and application thereof. Background technique [0002] Thermal barrier coatings are mainly used in the hot end parts of aero-engines to protect the engine from heat. The thermal barrier coating is mainly composed of a ceramic layer for thermal insulation and an adhesive layer for anti-oxidative corrosion. The bonding layer is located between the alloy matrix and the ceramic layer, which can alleviate the thermal expansion difference between the ceramic layer and the superalloy. The dense alumina generated after the bonding layer is oxidized at high temperature prevents further oxidation of the bonding layer and the alloy. [0003] At present, β-(Ni,Pt)Al and NiCoCrAlY are the two mainstream bonding layer materials. Among them, β-(Ni,Pt)Al has excellent oxidation resistance, but its hot corrosion resistance i...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C23C30/00F01D5/28
CPCC22C30/00C22C5/04C22C1/02C23C30/00F01D5/288Y02E60/50
Inventor 张显程赵晓峰李玲涂善东束国刚孙健王卫泽石俊秒雷跃华
Owner EAST CHINA UNIV OF SCI & TECH
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