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Method for preparing CeO2-Al2O3 compound ceramic layer by electrolytic deposition of cathode micro-arc plasma on surface of TiAl alloy

A cathode micro-arc, composite ceramic technology, applied in surface reaction electrolytic coating, electrolytic coating, coating and other directions, can solve the problems of complicated operation, low friction coefficient of composite ceramic layer, high temperature oxidation resistance, difficult to control, etc. Simple, improved densification and stability, easy-to-control effects

Active Publication Date: 2018-01-09
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

Therefore, this subject studies the influence of oxide doping on the stability of cathodic micro-arc deposition coatings, using CeO with low PBR value 2 Doping stabilized Al 2 o 3 , improve the density and stability of the cathodic micro-arc deposition ceramic coating, and the prepared composite ceramic layer has a lower friction coefficient and high high temperature oxidation resistance; at the same time, the existing cathodic micro-arc deposition technology uses multiple dipping methods Perform pretreatment to prepare the arc-starting barrier layer, or use the gas film produced by the electrolysis of the surface of the cathode sample in the solution as a barrier layer to generate electricity, the operation is cumbersome and difficult to control, and the pretreatment process of the cathode micro-arc deposition technology is improved. Promotion and application also have value

Method used

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  • Method for preparing CeO2-Al2O3 compound ceramic layer by electrolytic deposition of cathode micro-arc plasma on surface of TiAl alloy
  • Method for preparing CeO2-Al2O3 compound ceramic layer by electrolytic deposition of cathode micro-arc plasma on surface of TiAl alloy
  • Method for preparing CeO2-Al2O3 compound ceramic layer by electrolytic deposition of cathode micro-arc plasma on surface of TiAl alloy

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Experimental program
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Effect test

Embodiment approach 1

[0037] (1) Use 240# to 1500# sandpaper to polish the test piece in turn, remove the TiAl alloy surface covering, and then rinse it with tap water for 2 minutes.

[0038] (2) Put the polished sample piece into a beaker filled with acetone, vibrate for 5 minutes under ultrasonic waves, remove the grease attached to the surface, rinse it with deionized water for 2 minutes, air dry it naturally, and set it aside.

[0039] (3) The treated TiAl alloy sample piece is used as an anode, and the stainless steel piece is placed as a cathode in an aqueous electrolyte in parallel, and the micro-arc oxidation treatment is performed by using a plasma micro-arc oxidation power supply. The electrolyte composition is: Na 2 SiO 3 6g / L, NaAlO 2 46g / L, NaF 2g / L, NaOH 2g / L, the micro-arc oxidation process parameters are: frequency 500Hz, duty cycle 20%, current density 5A / dm 2 , temperature 10-15 ℃. The pretreatment time is 4min. After the pretreatment is completed, rinse with deionized water...

Embodiment approach 2

[0046] (1) Use 240# to 1500# sandpaper to polish the test piece in turn, remove the TiAl alloy surface covering, and then rinse it with tap water for 2 minutes.

[0047] (2) Put the polished sample piece into a beaker filled with acetone, vibrate for 5 minutes under ultrasonic waves, remove the grease attached to the surface, rinse it with deionized water for 2 minutes, air dry it naturally, and set it aside.

[0048] (3) The treated TiAl alloy sample piece is used as an anode, and the stainless steel piece is placed as a cathode in parallel in the electrolyte of an aqueous solution system, and the micro-arc oxidation treatment is performed by using a plasma micro-arc oxidation power supply. The electrolyte composition is: Na 2SiO 3 6g / L, NaAlO 2 46g / L, NaF 2g / L, NaOH 2g / L, micro-arc oxidation process parameters: frequency 500Hz, duty cycle 20%, current density 5A / dm2, temperature 10-15°C. The pretreatment time is 1min, 2min, 3min, 5min and 6min respectively, which are re...

Embodiment approach 3

[0054] (1) Use 240# to 1500# sandpaper to polish the test piece in turn, remove the TiAl alloy surface covering, and then rinse it with tap water for 2 minutes.

[0055] (2) Put the polished sample piece into a beaker filled with acetone, vibrate for 5 minutes under ultrasonic waves, remove the grease attached to the surface, rinse it with deionized water for 2 minutes, air dry it naturally, and set it aside.

[0056] (3) The treated TiAl alloy sample piece is used as an anode, and the stainless steel piece is placed as a cathode in parallel in the electrolyte of an aqueous solution system, and the micro-arc oxidation treatment is performed by using a plasma micro-arc oxidation power supply. The electrolyte composition is: Na 2 SiO 3 6g / L, NaAlO 2 46g / L, NaF 2g / L, NaOH 2g / L, the micro-arc oxidation process parameters are: frequency 500Hz, duty cycle 20%, current density 5A / dm 2 , temperature 10-15 ℃. The pretreatment time is 5min. After the pretreatment is completed, ri...

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Abstract

The invention relates to a method for preparing a CeO2-Al2O3 compound ceramic layer by electrolytic deposition of cathode micro-arc plasma on a surface of a TiAl alloy. According to the method, a pretreatment technology to the electrolytic deposition of the cathode micro-arc plasma is improved, and the method that CeO2 with a low PBR value is doped and introduced into Al2O3 and the CeO2-Al2O3 compound high-temperature-resistant wear-resistant ceramic layer which is uniform, compact and good in stability is prepared on the surface of the TiAl alloy is provided for the first time according to aPBR value theory. The method for preparing the CeO2-Al2O3 compound ceramic layer by the electrolytic deposition of the cathode micro-arc plasma on the surface of the TiAl alloy has the advantages thatcompound ceramic grows in situ on the surface of the TiAl alloy, and binding force is good; the pretreatment technology is simple and easy to control; and the CeO2 with the low PBR value is doped with the Al2O3, compactness and stability of the compound ceramic layer are improved, and compared with a Al2O3 single-component ceramic layer, the CeO2-Al2O3 compound ceramic layer has relatively low friction coefficient and high-temperature oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of metal material surface modification, and relates to the preparation of CeO by cathodic micro-arc plasma electrolytic deposition on the surface of TiAl alloy 2 -Al 2 o 3 The method of composite ceramic layer is specially used for the strengthening and modification of TiAl alloy surface, and the preparation, production and application of high temperature and wear-resistant composite ceramic layer. Background technique [0002] TiAl alloy has the characteristics of low density, high elastic modulus, high specific strength, etc., and is a very promising light-weight high-temperature-resistant structural material for aero-engines, but its insufficient high-temperature oxidation resistance and poor wear resistance have restricted its application. biggest obstacle. At present, there are two ways to improve the high temperature oxidation resistance and wear resistance of TiAl alloy, designing new alloy additio...

Claims

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Application Information

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IPC IPC(8): C25D11/06C25D11/26
Inventor 谢发勤王少青吴向清
Owner NORTHWESTERN POLYTECHNICAL UNIV
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