A mcraly coating with excellent oxidation resistance and preparation method thereof

A coating and equipment technology, applied in the field of preparing MCrAlY coating by ion-assisted electron beam physical vapor deposition technology, can solve the problems of high cost, high coating deposition efficiency, large porosity, etc., and achieve the effect of reducing damage

Inactive Publication Date: 2011-12-07
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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  • A mcraly coating with excellent oxidation resistance and preparation method thereof
  • A mcraly coating with excellent oxidation resistance and preparation method thereof
  • A 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 feed rod 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) Set...

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Abstract

The invention discloses a MCrAlY coating with excellent oxidation resistance and a preparation method thereof. The plasma-assisted electron beam physical vapor deposition technology is used to prepare the coating by controlling the temperature of the substrate, the anode discharge voltage, the evaporation current and the bias voltage applied on the substrate. The MCrAlY coating has an equiaxed grain size of 10-50 μm; the coating is strongly oriented along the (111) close-packed direction; the twin size in the coating is 200-500 nm; the phase in the coating is along the growth direction It is uniformly distributed in strips, and the size of the β phase is less than 1 μm, forming a large number of phase interfaces. When the coating is used at 1150 °C, the high-density twins and phase boundaries provide channels for the rapid diffusion of Al elements, making it easier to form a dense α-Al2O3 protective film, and at the same time weaken the matrix element diffusion to form an oxide film. The destructive effect of the coating is excellent, and the oxidation resistance of the coating is an order of magnitude higher than that of the traditional 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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Patent Type & Authority Patents(China)
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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