Turbine blade with water erosion-proof coating and preparation method thereof

A technology for steam turbine blades and steam turbines, which is applied to coatings, mechanical equipment, and blade support components, and can solve problems such as poor bonding between coatings and substrates, easy corrosion of brazed seams, large thermal stress and deformation, etc., to achieve Good water erosion resistance, good damage resistance and peeling performance, and the effect of resisting water erosion

Inactive Publication Date: 2011-09-21
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of brazing Stellite alloy, due to the large heat-affected zone, large thermal stress and deformation are generated, and the weld seam is not dense due to the welding process, which makes the brazing seam more prone to corrosion and causes the alloy to fall off; and Coatings are generally prepared by thermal spraying coating or electroplating hard chrome coating to protect the parts of the blade that are prone to water erosion, but the coatings prepared by the two methods have poor adhesion to the substrate, and it is still unavoidable during the long-term operation of the blade. occurrence of water erosion

Method used

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  • Turbine blade with water erosion-proof coating and preparation method thereof
  • Turbine blade with water erosion-proof coating and preparation method thereof
  • Turbine blade with water erosion-proof coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0014] Such as figure 1 and figure 2 The shown steam turbine blade with an anti-corrosion coating has a length of 620 mm, and the back arc of the top of the steam inlet side of the steam turbine blade substrate 1 is covered with a Cr-Ni stainless steel coating 2 deposited by a high-energy micro-arc spark deposition process. The stainless steel coating 2 has a thickness of 0.4 mm and a length L=11 cm.

[0015] The above-mentioned steam turbine blade with an anti-corrosion coating is prepared through the following steps:

[0016] (1) Grinding the back arc at the top of the steam inlet side of the last stage blade substrate (2Cr13) of the steam turbine, then cleaning and drying with acetone;

[0017] (2) Use 316L alloy with a diameter of 2.5mm as the electrode material, clamp the electrode on the welding torch, control the length of the electrode protruding from the nozzle at 20-40mm, and use high-energy micro-arc deposition technology to deposit the electrode material on the ...

Embodiment 2

[0021] A steam turbine blade with an anti-corrosion coating of the present invention has a length of 620mm, and the back arc of the top of the steam inlet edge of the steam turbine blade substrate is covered with a Cr-Ni stainless steel coating deposited by a high-energy micro-arc spark deposition process. The stainless steel coating has a thickness of 0.8 mm and a length L=11 cm.

[0022] The above-mentioned steam turbine blade with an anti-corrosion coating is prepared through the following steps:

[0023] (1) Grinding the back arc at the top of the steam inlet side of the last stage blade substrate (2Cr13) of the steam turbine, then cleaning and drying with acetone;

[0024] (2) Use 0Cr19Ni10NbN alloy with a diameter of 2.5mm as the electrode material, clamp the electrode on the welding torch, control the length of the electrode protruding from the nozzle at 20-40mm, and use high-energy micro-arc deposition technology to deposit the electrode material on the polished part; ...

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Abstract

The invention discloses a steam turbine blade which is provided with a water erosion resistant coating. A stainless steel coating deposited through high energy micro arc spark deposition technique is coated on the back arc of the top of an inlet edge of the steam turbine blade. The stainless steel coating is made of Cr-Ni stainless steel material with the thickness of 0.4-0.8mm and 15-18% of the length of the steamer vane. The steam turbine blade is fabricated through the processes of polishing treatment, washing through acetone, high energy micro arc spark deposition, and polishing. The steam turbine blade fabricated through the method has high hardness, long service life, good abrasion resistance, good corrosion resistance and good water erosion resistance.

Description

technical field [0001] The invention relates to a steam turbine blade and a preparation method thereof, in particular to a coated steam turbine blade and a preparation method thereof. Background technique [0002] Electricity is the cornerstone of modern industrial development and one of the most important energy sources in the world. 80% of my country's electricity comes from thermal power generation, most of which use steam turbines as prime movers. The last-stage blades of the steam turbine work in the wet steam area. When the steam flows to the final-stage blades, the water droplets carried by the wet steam will wash away the high-speed rotating blades. After long-term operation of the existing steam turbine blades, water erosion often occurs on the top of the steam inlet side, resulting in imbalance of blade quality, large vibration of the unit, and the water-eroded part is easy to form a crack source for blade cracking, resulting in blade breakage and forced shutdown ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D5/28C23C4/02C23C4/06C23C26/00
Inventor 陈荐任延杰何建军戎雪坤王钊
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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