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MCrAlY coating with excellent oxidation resistance and preparation method thereof

A technology of anti-oxidation performance and coating, applied in the direction of coating, metal material coating process, ion implantation plating, etc., can solve the problems of high cost, large porosity, complex process, etc., and achieve the effect of reducing damage

Inactive Publication Date: 2010-07-28
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The MCrAlY coating prepared by low-pressure plasma spraying has high deposition efficiency and low cost, but the coating has poor adhesion, large porosity, and poor surface finish; the coating prepared by multi-arc ion plating is mainly formed by the accumulation of droplets, with pores, and the surface The smoothness is not high; the electron beam physical vapor deposition method has fast deposition speed and high smoothness, but the deposited coating is columnar crystals, and oxygen and other corrosive atmospheres can easily enter the interior of the coating along the columnar grain boundaries, reducing oxidation resistance and corrosion resistance. , so subsequent processes such as shot peening and vacuum heat treatment are required, the process is complicated and the cost is high

Method used

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  • MCrAlY coating with excellent oxidation resistance and preparation method thereof
  • MCrAlY coating with excellent oxidation resistance and preparation method thereof
  • MCrAlY coating with excellent oxidation resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: NiCoCrAlY coating is prepared on the as-cast NiCoCrAlY alloy substrate

[0046] (1) prepare the evaporating material rod, and set it aside;

[0047] The composition of NiCoCrAlY rod is nickel, cobalt, chromium, aluminum and yttrium, and its percentage by weight is 47.8% nickel, 20% cobalt, 22% chromium, 8.8% aluminum, 1.4% yttrium, the total amount of the above-mentioned components is 100%;

[0048] (2) Polish the Φ16×2mm disc cut from the above-mentioned rod with 150#, 300#, 400#, 800# sandpaper sequentially to make the surface roughness Ra<0.8. Then put it into acetone for ultrasonic cleaning for 30min, and install it on the rotating substrate frame of electron beam physical vapor deposition equipment;

[0049] (3) NiCoCrAlY feed rod is placed in the water-cooled copper crucible;

[0050] (4) Pump the vacuum chamber to the required lower than 5×10 -3 Pa vacuum degree;

[0051] (5) Set the rotational speed of the rotating substrate holder to 12rpm, a...

Embodiment 2

[0059] Embodiment 2: CoCrAlY coating is prepared on the DZ125 alloy substrate

[0060] (1) Prepare the evaporating material stick, spare

[0061] The composition of CoCrAlY material bar is cobalt, chromium, aluminum and yttrium, and its percentage by weight is 57% cobalt, 30% chromium, 12% aluminum, 1.0% yttrium, and the total amount of above-mentioned each composition is 100%;

[0062] (2) Wire-cut the Φ16 DZ125 (composition in Table 1) alloy test rod into 2mm discs and polish it with 150#, 300#, 400#, 800# sandpaper in sequence to make the surface roughness Ra<0.8. Then put it into acetone for ultrasonic cleaning for 30min, and install it on the rotating substrate frame of electron beam physical vapor deposition equipment;

[0063] Table 1 Chemical composition of DZ125 alloy (wt.%)

[0064]

[0065] (3) CoCrAlY feed rod is placed in the water-cooled copper crucible;

[0066] (4) Pump the vacuum chamber to the required lower than 5×10 -3 Pa vacuum degree;

[0067] (5)...

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Abstract

The invention discloses an MCrAlY coating with excellent oxidation resistance and a preparation method thereof. By adopting a plasma-assisted electron beam physical vapor deposition technique and controlling the substrate temperature, the anodal discharge voltage, the evaporation voltage and the bias voltage applied on a matrix, the MCrAlY coating is prepared, and the crystallite dimension of the coating is 10 Mu m to 50 Mu m of isometric crystal structure; the orientation of the coating along a (111) close-packed direction is strong; the twin crystal dimension in the coating is 200nm to 500nm; the Beta phase in the coating is uniformly distributed in the form of strips along the growing direction, moreover, the dimension of the Beta phase is less than 1 Mu m, and a large quantity of phase interfaces are formed. When the coating is used under the temperature of 1150 DEG C, the high-density twin crystals and the phase interfaces provide passages for Al element to quickly diffuse outwards, so that a dense Alpha-Al2O3 protective film can be more easily formed, meanwhile, the destructive effect of the outward diffusion of the matrix element on the oxide film is weakened, and thereby the oxidation resistance of the coating is excellent, and is increased by one order of magnitude compared with the oxidation resistance of the conventional EB-PVD coating.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy coating preparation, and relates to a MCrAlY coating with a novel structure and a preparation method thereof, more particularly, the MCrAlY coating is prepared by plasma-assisted electron beam physical vapor deposition (EB-PVD) technology. layer method. Background technique [0002] For modern gas turbine engines, one of the main means to improve their working efficiency is to increase the combustion operating temperature of the engine as a whole. Therefore, it is necessary to apply a high-temperature protective coating on the surface of the high-temperature working parts to improve the oxidation resistance and corrosion resistance of the high-temperature working parts. MCrAlY (M=Co, Ni or Co+Ni) coating is a cladding coating that has been widely used since the 1990s. MCrAlY coating has good high temperature oxidation resistance and hot corrosion resistance, and has good plasticit...

Claims

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Application Information

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IPC IPC(8): C23C14/30C23C14/16
Inventor 郭洪波彭徽姚锐宫声凯徐惠彬
Owner BEIHANG UNIV
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