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AlFexCrCoNi high-entropy alloy surface ceramization method

A high-entropy alloy and ceramic technology, applied in surface reaction electrolytic coating, anodizing, electrolytic coating, etc., to achieve the effect of improving corrosion resistance and wear resistance

Pending Publication Date: 2021-03-26
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the growth mechanism of the micro-arc oxidation ceramic layer requires the substrate to be a valve metal. Since Fe is not a valve metal in the AlFeCrCoNi high-entropy alloy, it is difficult to use the micro-arc oxidation method to perform ceramic treatment on the high-entropy alloy.

Method used

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  • AlFexCrCoNi high-entropy alloy surface ceramization method
  • AlFexCrCoNi high-entropy alloy surface ceramization method

Examples

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preparation example Construction

[0032] AlFe x The preparation method of CrCoNi high-entropy alloy is generally a smelting method, and the smelting method of this embodiment is specifically:

[0033] Select the elemental metals Al, Fe, Cr, Co and Ni with a purity greater than 99.9% for future use;

[0034] with B 2 o 3 Or boric acid is heated separately with elemental metal Al, Fe, Cr, Co or Ni, and then the oxide film on the surface of the elemental metal can be removed, making the purity of the elemental metal higher. When boric acid is used, boric acid decomposes to form boric anhydride, its melting point is 580°C, and the reaction process is 2H 2 BO 3 →B 2 o 3 +2H 2 O; Boron anhydride forms easily soluble borate with oxides of Cu, Zn, Ni and Fe, and the reaction process is MeO+B 2 o 3 →MeO·B 2 o 3 ; To remove the oxide film on the surface of the elemental metal, MeO represents the oxide formed by each elemental metal.

[0035] The heated elemental metals Al, Fe, Cr, Co and Ni are cleaned and d...

Embodiment 1

[0044] In this example, in AlFe 0.3 The black ceramic layer is prepared on the surface of CrCoNi high-entropy alloy, that is, the micro-arc oxidation ceramic layer is prepared in the electrolyte, so that the surface layer of the high-entropy alloy matrix is ​​uniformly formed in situ containing Fe 3 o 4 A ceramic layer composed of various oxides, the thickness of the ceramic layer is 5 μm.

[0045] The above AlFe 0.3 The preparation method of the black ceramic layer on the surface of CrCoNi high-entropy alloy comprises the steps:

[0046] Step 1: Select the following five high-purity elements Al, Fe, Cr, Co, and Ni (purities are all above 99.9%), and mix them according to the chemical composition of the molar ratio 1:0.3:1:1:1: , among them, Al chooses pure aluminum particles, prepares 10.11g, Fe chooses pure iron particles, prepares 6.28g, Cr chooses pure chromium particles, prepares 19.49g, Co chooses pure cobalt particles, prepares 22.09g, Ni chooses pure nickel particle...

Embodiment 2

[0055] In this example, AlFe 0.5 The black ceramic layer on the surface of the CrCoNi high-entropy alloy, that is, the micro-arc oxidation ceramic layer is prepared in the electrolyte, so that the surface layer of the high-entropy alloy matrix is ​​formed in situ containing Fe 3 o 4 A ceramic layer composed of various oxides, the thickness of the ceramic layer is 15 μm.

[0056] The above AlFe 0.5 The preparation method of the black ceramic layer on the surface of CrCoNi high-entropy alloy comprises the steps:

[0057] Step 1: Select high-purity Al, Fe, Cr, Co, Ni (all above 99.9% in purity) metals, and mix them according to the chemical composition of 1:0.5:1:1:1: Among them, Al is selected Pure aluminum particles, prepare 9.61g of materials, Fe selects pure iron particles, prepares 9.94g, Cr selects pure chromium particles, prepares 18.52g, Co selects pure cobalt particles, prepares 20.99g, Ni selects pure nickel particles, prepares 20.91g, will prepare The good raw mate...

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Abstract

The invention discloses an AlFexCrCoNi high-entropy alloy surface ceramization method. According to the AlFexCrCoNi high-entropy alloy surface ceramization method, an AlFexCrCoNi high-entropy alloy ispre-treated; and micro-arc oxidation treatment is carried out on the pretreated AlFexCrCoNi high-entropy alloy by adopting a direct-current pulse micro-arc oxidation power supply and a prepared silicate micro-arc oxidation electrolyte so as to form a ceramic layer on the surface of the AlFexCrCoNi high-entropy alloy. According to the AlFexCrCoNi high-entropy alloy surface ceramization method, AlFexCrCoNi high-entropy alloy surface ceramization is taken as a target, the matching degree of high-entropy alloy elements is regulated and controlled, the electrical parameters of high frequency, lowduty ratio and high voltage are combined, the appropriate micro-arc oxidation electrolyte is selected and matched, a black oxidation film ceramic layer can be rapidly obtained on the AlFexCrCoNi high-entropy alloy surface, ceramization of the high-entropy alloy is achieved, and the corrosion resistance and the wear resistance are improved.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloy surface coating, in particular to an AlFe x CrCoNi high entropy alloy surface ceramization method. Background technique [0002] High-entropy alloy is also a new type of metal material developed in recent years. It is a single-phase solid solution formed by mixing five or more elements in an equiatomic ratio or approximately equiatomic ratio. It has the advantages of high strength, hardness, and good toughness. And excellent thermal stability and high temperature mechanical properties. [0003] AlFeCrCoNi high-entropy alloy is a relatively mature alloy system. The microstructure of AlFeCrCoNi high-entropy alloy is composed of BCC single-phase solid solution, which is in the form of dendrites. It has excellent corrosion resistance, compressive strength and wear resistance in NaCl solution. In order to further improve the performance of high-entropy alloys, it is suitable to prepare on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/34C22C1/02C22C30/00
CPCC22C1/02C22C30/00C25D11/026C25D11/34
Inventor 杨巍程赵辉石小倩徐大鹏蓝楠武上焜陈建
Owner XIAN TECHNOLOGICAL UNIV
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