Aluminum/aluminum oxide/Ni-base superalloy composite coating for titanium-aluminum alloy and preparation method thereof

A composite coating and alloy technology, applied in the direction of metal material coating process, coating, metal layered products, etc., can solve problems such as chemical mismatch, and achieve the effects of avoiding interface reaction, good barrier, and good high temperature stability

Inactive Publication Date: 2008-11-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to improve the high-temperature oxidation resistance of Ti-Al alloys and ensure their service performance in high-temperature environments, the purpose of the present invention is to provide an Al / Al alloy with excellent performance and easy preparation. 2 o 3 / MCrAlY composite coating, to solve the chemical mismatch between MCrAlY coating and Ti-Al alloy, used for high temperature protection of Ti-Al alloy

Method used

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  • Aluminum/aluminum oxide/Ni-base superalloy composite coating for titanium-aluminum alloy and preparation method thereof
  • Aluminum/aluminum oxide/Ni-base superalloy composite coating for titanium-aluminum alloy and preparation method thereof
  • Aluminum/aluminum oxide/Ni-base superalloy composite coating for titanium-aluminum alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This embodiment is Al / Al 2 o 3 Application of / MCrAlY composite coating on γ-TiAl alloy. The substrate composition is Ti-48Al-2Cr-2Nb (at.%), and the sample size is 15×10×2mm 3 . The substrate is ground with metallographic sandpaper, cleaned and sandblasted (220 mesh glass shot, wet sprayed). Deposition of Al and Al on domestic MIP-8-800 arc ion plating equipment 2 o 3 and NiCoCrAlY coating, the cathode target material is metal aluminum (99%, wt.%) and Ni32Co20Cr8Al0.5Y (wt.%) alloy, the background vacuum degree of the vacuum chamber is 7×10 -3 Pa, target base distance is about 240mm, substrate temperature is 300-400°C; first deposit 2-3μm thick Al film, then deposit 2-3μm thick Al 2 o 3 thin film, and finally deposit a 20-30 μm NiCoCrAlY coating. Before depositing the NiCoCrAlY coating, apply a high bias voltage of -800--1000V, and clean the surface of the sample by sputtering for 2-5 minutes; the deposition process parameters are shown in Table 1 . After coat...

Embodiment 2

[0033] This embodiment is Al / Al 2 o 3 / NiCoCrAlY composite coating on O-Ti under isothermal and cyclic oxidation conditions at 800 °C 2 High temperature protection of AlNb alloys. The substrate composition is Ti-22Al-26Nb (at.%), and the sample size is 15×10×2mm 3 . The substrate is ground with metallographic sandpaper, cleaned and sandblasted (220 mesh glass shot, wet sprayed). The coating deposition parameters are the same as in Example 1. After coating, the sample is subjected to vacuum heat treatment, and the temperature is raised at a rate of -1 Pa.

[0034] Prepared Al / Al 2 o 3 / NiCoCrAlY composite coating can treat O-Ti under both isothermal and cyclic oxidation conditions at 800 °C 2 AlNb alloys provide good high temperature protection, as shown in Figure 3(a)-(b) for isothermal and cyclic oxidation at 800°C. O-Ti 2 The surface of AlNb alloy is easy to peel off during the high temperature oxidation process, and TiO 2 The mixed oxide film mainly cannot provide...

Embodiment 3

[0036] This embodiment is Al / Al 2 o 3 / NiCoCrAlY composite coating on O-Ti under cyclic oxidation conditions at 900 °C 2 High temperature protection of AlNb alloys and their high temperature stability. The substrate composition, coating process and heat treatment system are the same as in Example 2.

[0037] Prepared Al / Al 2 o 3 / NiCoCrAlY composite coating can treat O-Ti under cyclic oxidation conditions at 900 °C 2 AlNb alloys provide good high temperature protection, such as Figure 5 is the cyclic oxidation weight gain curve at 900°C. The NiCoCrAlY coating is almost completely consumed, and the O-Ti 2 The microstructure of AlNb is also significantly changed due to the serious interdiffusion between the coating and the substrate at high temperature, so it is difficult for NiCoCrAlY coatings to be directly applied to O-Ti without a diffusion barrier layer. 2 On AlNb, see Figure 6(a). And Al / Al 2 o 3 Formation of continuous and dense α-Al on the surface of / NiCoCrAl...

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Abstract

The invention relates to the coating technique, in particular to an Al/Al2O3/MCrAlY composite coating used in Ti-Al alloy and a preparation method thereof, which aims at improving the high-temperature oxidation resistance of the Ti-Al alloy, guaranteeing the serviceability of the Ti-Al alloy in the high-temperature environment and solving the problem of non-matching between the MCrAlY coating and the Ti-Al alloy and is used for the high-temperature protection of the Ti-Al alloy. The composite coating comprises an Al/Al2O3 diffusion impervious layer and an MCrAlY alloy protective coating which are deposited on a substrate of the alloy in sequence; the thickness ratio among an Al film, an Al2O3 film and the MCrAlY protective coating is (1 to 5): (1 to 5): (20 to 50); in the MCrAlY alloy, M indicates Ni, Co or Ni plus Co. The arc ion plating technique is adopted to deposit the Al/Al2O3 diffusion impervious layer and then the MCrAlY coating on the substrate of the alloy. The composite coating of the invention has good high-temperature oxidation resistance as well as good bonding strength and high-temperature stability and can provide good high-temperature protection to the Ti-Al alloy.

Description

technical field [0001] The invention relates to coating preparation technology, in particular to an Al / Al coating used for high temperature protection of Ti-Al alloys 2 o 3 / MCrAlY composite coating and preparation method. Background technique [0002] Ti-Al intermetallic compound-based alloy (α 2 -Ti 3 Al, γ-TiAl and O-Ti 2 AlNb) has become one of the new high-temperature materials with wide application prospects due to its low density, high elastic modulus and excellent high-temperature properties. It is considered to be an ideal lightweight high-temperature structural material for aerospace and automotive industries. The common problems in the application of Ti-Al alloys are insufficient oxidation resistance and environmental brittleness (dissolved oxygen in the alloy at high temperature causes the alloy to become brittle), α 2 -Ti 3 The oxidation limit temperature of Al alloy is 600-650℃, the oxidation limit temperature of γ-TiAl alloy is 800-900℃, O-Ti 2 The oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B33/00B32B15/04C23C14/06C23C14/22C23C14/54
Inventor 宫骏王启民孙超鲍泽斌华伟刚肖金泉刘山川姜肃猛闻立时
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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