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A Laser Surface Treatment Method for Improving Thermal Corrosion Resistance of Thermal Barrier Coatings

A technology of laser surface treatment and thermal barrier coating, which is applied in the direction of coating, metal material coating technology, fusion spraying, etc., can solve the problems of surface thermal corrosion and infiltration thermal corrosion inhibition are not obvious, and reach the surface corrosion level Reduce, improve heat corrosion resistance, inhibit the effect of infiltration

Active Publication Date: 2019-12-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing laser remelting technology process is relatively simple, and the inhibition effect on surface thermal corrosion and infiltration thermal corrosion is not obvious

Method used

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  • A Laser Surface Treatment Method for Improving Thermal Corrosion Resistance of Thermal Barrier Coatings
  • A Laser Surface Treatment Method for Improving Thermal Corrosion Resistance of Thermal Barrier Coatings
  • A Laser Surface Treatment Method for Improving Thermal Corrosion Resistance of Thermal Barrier Coatings

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Effect test

Embodiment 1

[0039] A laser surface treatment method for improving the thermal corrosion resistance of YSZ thermal barrier coatings, comprising the steps of:

[0040] Step S1: Use an ultrasonic instrument to ultrasonically clean the surface of the YSZ thermal barrier coating, and adjust the spot shape of the semiconductor laser to a rectangle, and the spot size is 12mm×2mm;

[0041] Step S2: Adjust the laser power of the semiconductor laser to 400W, adjust the scanning speed of the semiconductor laser to 10mm / s, and obtain an energy density of 7.2J / mm2 A low energy density laser, using the low energy density laser to perform self-preheating scanning on the YSZ thermal barrier coating treated in step S1;

[0042] Step S3: Adjust the laser power of the semiconductor laser to 1800W, adjust the scanning speed of the semiconductor laser to 20mm / s, and obtain an energy density of 12J / mm 2 A high-energy-density laser, using the high-energy-density laser to remelt and scan the YSZ thermal barrier ...

Embodiment 2

[0048] A laser surface treatment method for improving the thermal corrosion resistance of YSZ thermal barrier coatings, comprising the steps of:

[0049] Step S1: Use an ultrasonic instrument to ultrasonically clean the surface of the YSZ thermal barrier coating, and adjust the spot shape of the semiconductor laser to a rectangle, and the spot size is 12mm×2mm;

[0050] Step S2: Adjust the laser power of the semiconductor laser to 300W, adjust the scanning speed of the semiconductor laser to 8mm / s, and obtain an energy density of 7.7J / mm 2 A low energy density laser, using the low energy density laser to perform self-preheating scanning on the YSZ thermal barrier coating treated in step S1;

[0051] Step S3: Adjust the laser power of the semiconductor laser to 1500W, adjust the scanning speed of the semiconductor laser to 15mm / s, and obtain an energy density of 12.9J / mm 2 A high-energy-density laser, using the high-energy-density laser to remelt and scan the YSZ thermal barri...

Embodiment 3

[0057] A laser surface treatment method for improving the thermal corrosion resistance of YSZ thermal barrier coatings, comprising the steps of:

[0058] Step S1: Use an ultrasonic instrument to ultrasonically clean the surface of the YSZ thermal barrier coating, and adjust the spot shape of the semiconductor laser to a rectangle, and the spot size is 12mm×2mm;

[0059] Step S2: Adjust the laser power of the semiconductor laser to 500W, adjust the scanning speed of the semiconductor laser to 12mm / s, and obtain an energy density of 7.5J / mm 2 A low energy density laser, using the low energy density laser to perform self-preheating scanning on the YSZ thermal barrier coating treated in step S1;

[0060] Step S3: Adjust the laser power of the semiconductor laser to 2000W, adjust the scanning speed of the semiconductor laser to 28mm / s, and obtain an energy density of 12.8J / mm 2 A high-energy-density laser, using the high-energy-density laser to remelt and scan the YSZ thermal barr...

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Abstract

The invention discloses a laser surface treatment method for improving the thermal corrosion resistance of a thermal barrier coating, belonging to the technical field of treatment of thermal barrier coatings. The method comprises the following steps: S1, ultrasonically cleaning the surface of the thermal barrier coating, and adjusting the spot shape of a laser to a rectangular shape; S2, adjustingthe laser in the step S1 to emit low energy density laser, and carrying out self-preheating scanning on the thermal barrier coating treated in the step S1; S3, adjusting the laser in the step S1 to emit high energy density laser, and carrying out re-melting scanning on the thermal barrier coating treated in the step S2; S4, adjusting the laser in the step S1 to emit medium energy density laser, and performing a slow-cooling scanning on the thermal barrier coating treated in the step S3; S5, naturally cooling the thermal barrier coating treated in the step S4 to room temperature, and then using compressed air to remove impurities on the surface of the coating cooled to room temperature. After the coating is treated by using the method, the coating is smooth and dense, the thermal corrosionof corrosive salt is inhibited, and the service life of the coating is prolonged.

Description

technical field [0001] The invention relates to the technical field of treatment of thermal barrier coatings, in particular to a laser surface treatment method for improving the thermal corrosion resistance of thermal barrier coatings. Background technique [0002] Thermal barrier coatings have comprehensive properties such as high melting point, low thermal conductivity, high fracture toughness and high thermal expansion coefficient, and are currently widely used in the manufacture of turbine blades for aero-engines and gas turbines. There are many kinds of thermal barrier coating materials, among which YSZ(Y 2 o 3 Stabilized ZrO 2 ) The thermal barrier coating material is the most mature and widely used, and is often obtained by thermal spraying. As one of the important applications, YSZ thermal barrier coatings in gas turbines are often used in harsh conditions of thermal corrosion. Na and V impurities in fuel form Na 2 SO 4 -V 2 o 5 molten salt, and attached to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C23C4/18C23C4/11
CPCC23C4/11C23C4/18C23C24/10
Inventor 伊鹏战祥华尹晓丽贾德龙肖培发王志远桂文波刘衍聪
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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