Last stage vane of steam turbine and preparation method thereof

The technology of the last stage blade and steam turbine is applied in the field of the last stage blade of a steam turbine and its preparation, which can solve the problem that the water erosion resistance of the last stage blade is difficult to fully meet the requirements of water erosion resistance, and achieve good hydrophobic performance, reduce cost, and reduce coating stress. Effect

Active Publication Date: 2012-05-02
湖南省湘电锅炉压力容器检验中心有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the widely used last-stage blade anti-water erosion technologies such as surfacing hard alloy, electroplating hard chrome, plasma spraying, electric spark strengthening, shot peening, etc. are difficult to fully meet the anti-corrosion requirements.

Method used

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  • Last stage vane of steam turbine and preparation method thereof
  • Last stage vane of steam turbine and preparation method thereof
  • Last stage vane of steam turbine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Glow cleaning is performed on the final blade after nitriding treatment at 400°C and argon atmosphere. During the glow discharge, the bias voltage on the workpiece is -1200V, and the glow time is 30 minutes; After cleaning, deposit a 150 nanometer-thick transition metal Cr layer by arc discharge at 0.05 Pa; then deposit a 6-micron CrSiN water corrosion resistant layer by arc discharge at 300°C, -150V bias, and 2.3 Pa pressure. The size of the CrN nanocrystals is 5 nanometers, and the silicon content in the coating is 8at.%; when the water corrosion resistant layer is deposited, 4 microns of Cr is deposited by arc discharge method at 250℃, -200V bias voltage and 3.3Pa pressure. 2 O 3 / SiO 2 Waterproof layer, of which Cr 2 O 3 The nanocrystal size is 4 nanometers, and the silicon content in the coating is 10at.%; after the preparation is finished, it is naturally cooled to obtain the final blade of the chromium-based ceramic composite coating.

Embodiment 2

[0025] Example 2: Glow cleaning is performed on the final blade after nitriding treatment at 450°C and argon atmosphere, the bias voltage on the workpiece during the glow discharge process is -1200V, and the glow time is 30 minutes; After cleaning, deposit a 200nm thick transition metal Cr layer by arc discharge method under 0.06Pa conditions; then deposit 8 micron CrSiN water corrosion resistant layer by arc discharge method under 350℃, -180V bias voltage and 3Pa pressure conditions, in which CrN The nanocrystal size is 7 nanometers, and the silicon content in the coating is 10at.%; when the water corrosion resistant layer is deposited, 5 microns of Cr is deposited by arc discharge method under 300℃, -150V bias voltage and 3.3Pa pressure conditions 2 O 3 / SiO 2 Waterproof layer, of which Cr 2 O 3 The nanocrystal size is 6 nanometers, and the silicon content in the coating is 15at.%; after the preparation is finished, it is naturally cooled to obtain the final blade of the chromi...

Embodiment 3

[0026] Example 3: Glow cleaning is performed on the final blade after nitriding treatment at 430°C and argon atmosphere, the bias voltage on the workpiece during the glow discharge process is -1200V, and the glow time is 30 minutes; After cleaning, a 180-nanometer thick transition metal Cr layer was deposited by arc discharge at 0.05 Pa; then a 10 micron CrSiN water corrosion resistant layer was deposited by arc discharge at 320°C, -190V bias and 4 Pa ​​pressure, in which CrN The nanocrystalline size is 8 nanometers, and the silicon content in the coating is 15at.%; when the water corrosion resistant layer is deposited, 3 micron Cr is deposited by arc discharge method under 300℃, -160V bias voltage and 3.3Pa pressure conditions 2 O 3 / SiO 2 Waterproof layer, of which Cr 2 O 3 The nanocrystal size is 10 nanometers, and the silicon content in the coating is 20 at.%; after the preparation is finished, it is naturally cooled to obtain the final blade of the chromium-based ceramic com...

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Abstract

The invention discloses a last stage vane of a steam turbine and a preparation method thereof. The last stage vane of the steam turbine comprises a last stage vane substrate which is subjected to thermal refining; the last stage vane substrate is bonded with a chrome-based ceramic coating which consists of a bonding layer, a water-erosion resistance layer and a waterproof layer. The last stage vane has reasonably designed coating structure; and the prepared chrome-based ceramic composite coating has excellent bonding force, high hardness (30GPa) and excellent water-erosion resistance and better water-erosion resistance performance than that of the non-coated vane, greatly prolongs the service life of the last stage vane and generates no pollutions during the preparation process.

Description

Technical field [0001] The invention belongs to the technology of steam turbine blades, and specifically relates to a final stage blade of a steam turbine and a preparation method thereof. Background technique [0002] The failure of steam turbine blades is one of the main reasons for the shutdown of power plants. According to statistics from the Electric Power Academy (EPRI), between 1977 and 1981, the direct economic losses caused by the shutdown of the power plant due to blade failure were approximately between 1.55 billion and 1.94 billion US dollars. According to statistics by the Federal German Large Power Plant Workers Association (VGB) on the damage of steam turbine blades in thermal power plants, the damage of the last stage blades accounts for 70%. According to Westinghouse's data, the company's steam turbines have 35 low-pressure blades. 13 of the injuries were caused by water erosion, and Dewey and Riezer also reached similar conclusions. According to research condu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D5/28C23C14/04C23C14/22
Inventor 谢国胜杨兵丁辉杨湘伟万克洋
Owner 湖南省湘电锅炉压力容器检验中心有限公司
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