A kind of preparation method of high-temperature oxidation-resistant and wear-resistant composite coating on the surface of titanium alloy

A technology of anti-oxidation and composite coating at high temperature, which is applied in the coating process of metal materials, coating, and plating of superimposed layers. Limited performance, etc., to solve the problem of poor high temperature oxidation resistance, improve high temperature oxidation resistance and wear resistance, and strong oxidation resistance

Active Publication Date: 2015-09-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the ion oxygen penetration technology is directly used for the high temperature oxidation protection of titanium alloys, the phenomenon of "oxygen embrittlement" will easily occur, which will greatly reduce the mechanical properties of titanium alloys.
[0011] At present, the traditional surface technology is used to prepare a single coating due to the limited inward blocking effect of oxygen ions during the oxidation process, so it is very limited to improve the high temperature oxidation resistance.

Method used

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  • A kind of preparation method of high-temperature oxidation-resistant and wear-resistant composite coating on the surface of titanium alloy
  • A kind of preparation method of high-temperature oxidation-resistant and wear-resistant composite coating on the surface of titanium alloy
  • A kind of preparation method of high-temperature oxidation-resistant and wear-resistant composite coating on the surface of titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0053] The NiCoCrAlY alloy target and penetration agent used in the process of preparing the coating on the surface of TiAl alloy, by weight percentage: NiCoCrAlY alloy target, its composition ratio is Co accounted for 21-23wt%, Cr accounted for 22-24wt%, Al It accounts for 15-17wt%, Y accounts for 0.35-0.45wt%, and the balance is Ni; in the solid powder embedding aluminizing process, the components of the infiltration agent formula and the proportions of each component are: pure aluminum powder 20-40wt%, alumina 50 -70wt%, ammonium chloride 2-5wt%, and cerium oxide 0.5-1.5wt%.

[0054] Following table 1-2 provides some preferred embodiments of each component mass percentage of the present invention, but the content of each component of the present invention is not limited to the numerical value listed in this table, for those skilled in the art, fully Reasonable generalizations and inferences can be made on the basis of the numerical ranges listed in the tables.

[0055] Tab...

Embodiment 2

[0084] The NiCoCrAlY alloy target and penetration agent used in the coating process on the surface of TC4 alloy, by weight percentage: NiCoCrAlY alloy target, its composition ratio is 21-22wt% for Co, 22-23wt% for Cr, Al It accounts for 16-17wt%, Y accounts for 0.35-0.45wt%, and the balance is Ni; in the solid powder embedding aluminizing process, the components of the infiltration agent formula and the proportions of each component are: pure aluminum powder 30-40wt%, alumina 54 -70wt%, ammonium chloride 2-4wt%, and cerium oxide 0.5-1.5wt%.

[0085] In conjunction with Table 4-5, provide some preferred embodiments of the mass percentages of each component of the present invention, but the content of each component of the present invention is not limited to the numerical value listed in this table, for those skilled in the art, can fully Make reasonable generalizations and inferences based on the range of values ​​listed in the table.

[0086] Table 4: The mass percentage cont...

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Abstract

The invention relates to a composite coating with high-temperature oxidation resistance and abrasion resistance prepared on the surface of a titanium alloy. The surface layer of the composite coating is a continuous compact Al2O3 oxidation film layer with the thickness of 1-3 microns; an Al settled layer with the thickness of 10-15 microns and a Ni-Co-Cr-Al-Y alloy layer with the thickness of 4-6 microns are arranged in the middle of the composite coating; the metallurgical bonding between the composite coating and a matrix is realized through a NiCoCrAlTi diffusion alloy layer; a uniform continuous compact Al2O3 oxidized film layer is arranged on the surface of the composite coating, and the surface of the composite coating does not have defects of holes, cracks and the like, so that the wear resistance and high-temperature oxidation resistance of the composite coating are greatly improved; the element Al is in graded distribution along the thickness direction in a NiCoCrAlY alloy layer and a NiCoCrAlY diffusion layer to facilitate the combination of coatings, and the storage content of Al phase is high, so that the high-temperature oxidation resistance of the composite coating can be further improved; the juncture part between the composite coating and the matrix is flat and straight and is provided with a bright white mutual diffusion layer which is in metallurgical bonding with the matrix with a firm bonding force. An alloy infiltrated layer is prepared from gamma'-Ni3Al which is a hard phase, is tiny and in dispersed distribution, and can strengthen the matrix and improve the hardness and wear resistance of the matrix.

Description

Technical field: [0001] The invention relates to a method for preparing a high-temperature oxidation-resistant and wear-resistant composite coating on the surface of a titanium alloy, and belongs to the field of preparation of high-temperature oxidation-resistant and wear-resistant coatings. Background technique: [0002] Titanium alloy is an important structural metal developed in the 1950s. It has excellent mechanical and physical properties, such as high specific strength, strong heat resistance, corrosion resistance, good compatibility with structural materials and Low density, etc., have been widely used in the aerospace field. Titanium and its alloys not only have very important applications in aerospace and aerospace industries, but also have begun to be widely used in many industrial sectors such as chemical industry, petroleum, light industry, metallurgy, and power generation. Titanium alloys also have certain disadvantages, such as not being resistant to ablation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00
Inventor 张平则陈小虎魏东博魏翔飞王若男王琼
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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