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Preparation method of titanium alloy high temperature oxidation resistant coating

A technology of high temperature oxidation resistance and titanium alloy, applied in the field of material chemistry, it can solve the problems of difficult to meet service requirements, and the coating is easy to generate pores, etc., and achieve excellent high temperature oxidation resistance, high compactness, and enhanced bonding effect.

Active Publication Date: 2018-09-07
JIANGXI SCI & TECH NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating prepared by thermal spraying has an obvious layered structure, and the coating is prone to pores, and the bonding between the coating and the substrate is mostly mechanical bonding, which is difficult to meet the service requirements under heavy load conditions.

Method used

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  • Preparation method of titanium alloy high temperature oxidation resistant coating
  • Preparation method of titanium alloy high temperature oxidation resistant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Use sandpaper to polish the oxide skin on the surface of TC4, then place it in acetone and absolute ethanol for 5 minutes for ultrasonication to remove oil, oxides and other sundries on the surface of the substrate, and finally use 24# brown corundum sand for sandblasting, Sandblasting pressure is 0.3MPa;

[0022] (2) TiAl with a particle size of 30 μm 3 The powder is used as the feed material, and a coating with a thickness of 50 μm is prepared on the surface of the substrate by supersonic flame spraying. The distance is 150mm.

[0023] (3) In step 2, prepare a layer of metal aluminum with a thickness of 5 μm for vapor deposition on the surface of the coating. The parameters used are: the evaporation power is 11kW, and the evaporation time is 50s. Vacuum degree better than 10 -4 pa.

[0024] (4) Under the protection of industrial argon atmosphere, thermal diffusion treatment is carried out on the coating deposited with metal aluminum. The thermal diffusion trea...

Embodiment 2

[0028] (1) Use sandpaper to polish the oxide skin on the surface of TC4, then place it in acetone and absolute ethanol for 5 minutes for ultrasonication to remove oil, oxides and other sundries on the surface of the substrate, and finally use 24# brown corundum sand for sandblasting, The blasting pressure is 0.2MPa;

[0029] (2) TiAl with a particle size of 25 μm 3 The powder is used as the feed material, and a coating with a thickness of 150 μm is prepared on the surface of the substrate by supersonic flame spraying. The distance is 100mm.

[0030] (3) In step 2, the surface of the coating prepared in step 2 is vapor-deposited a layer of metal aluminum with a thickness of 10 μm. The parameters used are: the evaporation power is 10 kW, and the evaporation time is 100 s. During the evaporation process, the adsorption air in the pores of the coating is removed to keep Vacuum degree better than 10 - 4 pa.

[0031] (4) Under the protection of an industrial argon atmosphere, t...

Embodiment 3

[0035] (1) Use sandpaper to polish the oxide skin on the surface of TC4, then place it in acetone and absolute ethanol for 5 minutes for ultrasonication to remove oil, oxides and other sundries on the surface of the substrate, and finally use 24# brown corundum sand for sandblasting, Sandblasting pressure is 0.4MPa;

[0036] (2) TiAl with a particle size of 40 μm 3 The powder is used as the feed material, and a coating with a thickness of 200 μm is prepared on the surface of the substrate by supersonic flame spraying. The distance is 200mm.

[0037] (3) In step 2, the surface of the coating prepared in step 2 is vapor-deposited a layer of metal aluminum with a thickness of 10 μm. The parameters used are: the evaporation power is 12kW, and the evaporation time is 100s. During the evaporation process, the adsorption air in the pores of the coating is removed to keep Vacuum degree better than 10 - 4 pa.

[0038] (4) Under the protection of an industrial argon atmosphere, the...

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Abstract

The invention discloses a preparation method of titanium alloy high temperature oxidation resistant coating. The method comprises the following steps: polishing the oxide skin of a matrix with abrasive paper, then sequentially feeding the matrix into acetone and absolute ethyl alcohol, performing ultrasonic cleaning, and finally performing sand blasting treatment through brown aluminum oxide sand;spraying supersonic flame onto the surface of the matrix, so as to form coating; performing metallic aluminum evaporation on the surface of the formed coating; finally performing thermal diffusion treatment on the coating with deposited metallic aluminum. The method has the characteristics that the TiAl3 phase content can be increased through thermal dispersion reaction between the metallic aluminum and the coating between metal, and the formed coating is higher in compactness, thereby having excellent high temperature oxidation resistance.

Description

technical field [0001] The invention relates to a preparation method of a titanium alloy high-temperature oxidation-resistant coating, which belongs to the field of material chemistry. Background technique [0002] Titanium is an important structural metal developed in the 1950s. Titanium alloys have the characteristics of low relative density and high specific strength and are widely used in the aerospace field, known as "space metals". Titanium alloy has excellent corrosion resistance, non-magnetic properties, etc. It is an excellent structural material for military ships and is known as "marine metal". In recent years, with the continuous development of the titanium industry, titanium alloys have also been widely used in civil fields, such as automobiles, construction, medicine, stationery, etc., and are known as "all-round metals". [0003] However, titanium alloys still have some defects, such as poor wear resistance and easy oxidation. The above shortcomings can be i...

Claims

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Application Information

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IPC IPC(8): C23C4/129C23C4/08C23C14/24C23C14/16C23C14/58C23C28/02
CPCC23C4/08C23C4/129C23C14/16C23C14/24C23C14/5806C23C28/021C23C28/023
Inventor 段晓华刘学璋
Owner JIANGXI SCI & TECH NORMAL UNIV
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