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A kind of titanium alloy surface flame retardant sealing integrated coating and its preparation method and application

A technology of titanium alloy and flame retardant layer is applied in the field of flame retardant sealing integrated coating on the surface of titanium alloy and its preparation field, which can solve the problems of increased fuel consumption and reduced engine efficiency, and achieves reduction of maintenance cost and simplified structure. , the effect of good coating performance

Inactive Publication Date: 2021-11-19
INNER MONGOLIA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the gap between the casing and the blades increases, the efficiency of the engine also decreases. Some data show that the air path clearance of the high-pressure turbine blade tip of a typical engine is reduced by 0.254mm, and the efficiency can be increased by about 1%; the radial clearance of the compressor Increase 0.076mm, the fuel consumption rate can increase by about 1%; every 2% increase in work efficiency of a 530MW steam turbine can save about 23 million yuan and reduce 29,000 tons of CO 2 emissions

Method used

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  • A kind of titanium alloy surface flame retardant sealing integrated coating and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0025] (1) surface-treated titanium substrate: using TC4 titanium alloy specimen having a diameter of 25mm, a thickness of about 3.5mm wafer sample, the sample degreasing before spraying rust treatment, the surface of the sample using sandpaper progressively ground to 800 mesh, the sample is exposed smooth, smoother surface spraying;

[0026] After sandblasting the substrate by blast treatment, sand blasting is used as the alumina component, a particle size of 30 mesh sand, the substrate to obtain a certain roughness to improve adhesion between the coating and the substrate, sandblasting substrate roughness Ra of 1.5 m;

[0027] (2) preheating the substrate alloy: alloy using HVOF for preheating the substrate to produce an appropriate expansion, the preheating temperature of 100 ℃ -130 ℃, preheating time of 20S;

[0028] (3) Preparation of the flame-retardant coating layer is: a coating layer of flame sprayed material is Ti 40 ZR 25 Ni 3 Cu 12 Bo 20 Amorphous alloy spray powder, p...

Embodiment 2

[0032] (1) surface-treated titanium substrate: using TC4 titanium alloy specimen having a diameter of 25mm, a thickness of about 3.5mm wafer sample, the sample degreasing before spraying rust treatment, the surface of the sample using sandpaper progressively ground to 800 mesh, the sample is exposed smooth, smoother surface spraying;

[0033] After sandblasting the substrate by blast treatment, sand blasting is used as the alumina component, a particle size of 30 mesh sand, the substrate to obtain a certain roughness to improve adhesion between the coating and the substrate, sandblasting substrate roughness Ra of 1.5 m;

[0034] (2) preheating the substrate alloy: alloy using HVOF for preheating the substrate to produce an appropriate expansion, the preheating temperature of 100 ℃ -130 ℃; preheating time is 20S.

[0035] (3) Preparation of the flame-retardant coating layer is: a coating layer of flame sprayed material is Ti 40 ZR 25 Ni 3 Cu 12 Bo 20The amorphous alloy spray powder...

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Abstract

The invention discloses a flame-retardant and sealing integrated coating on the surface of a titanium alloy and its preparation method and application. The coating is composed of a flame-retardant coating and an abradable sealing coating. between the surface and the abradable seal coat. The preparation method comprises the following steps: (1) surface treatment of the titanium alloy substrate; (2) preheating of the titanium alloy substrate; (3) preparation of a flame retardant coating; (4) preparation of an abradable sealing coating . The present invention uses the flame-retardant layer of titanium-zirconium amorphous alloy as the bonding layer, cancels the original bonding layer, and uses nickel-chromium-aluminum-bentonite as the abradable sealing surface layer, and its function is to protect the blade and the casing , while reducing the porosity between them, improving thermal efficiency, thereby reducing manufacturing costs and reducing maintenance costs.

Description

Technical field [0001] The present invention relates to the field of surface treatment of titanium alloy. In particular to a titanium surface coating and flame seal Integration preparation method and application. Background technique [0002] Titanium has a low density, high strength, heat resistance and excellent corrosion resistance, it is widely used in aerospace and other fields. Casing, rotor blades of aero-engine compressor, etc., are titanium. However, with the increasing engine performance, the temperature of the compressor casing is also constantly improve, improve equipment for the ambient temperature of the material itself is a challenge. Increase the temperature within the casing of the expansion vane for the resulting material, it is also becoming increasingly apparent. According to the information is understood, 1977--1988 United States and the Soviet Union a spate of high-pressure compressor blade fracture stuck in the casing, causing spontaneous combustion of tita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/06C23C4/02C22C45/10
CPCC22C45/10C23C4/02C23C4/06C23C4/129
Inventor 马文齐英伟白玉汪瑞军马小斌鲍曼雨赵嘉炜张辰楠陈伟东
Owner INNER MONGOLIA UNIV OF TECH