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Pressurization alkali-boiling method for removing ceramic layer in thermal barrier coating

A technology for thermal barrier coatings and ceramic layers, which is applied in the field of pressurized alkali boiling for removing ceramic layers in thermal barrier coatings, can solve problems that have not been applied to the removal of thermal barrier coatings, and achieve high product quality consistency and convenience The effect of recoating and effective stripping

Active Publication Date: 2019-04-05
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it has not been applied to remove thermal barrier coatings prepared by EB-PVD technology

Method used

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  • Pressurization alkali-boiling method for removing ceramic layer in thermal barrier coating
  • Pressurization alkali-boiling method for removing ceramic layer in thermal barrier coating
  • Pressurization alkali-boiling method for removing ceramic layer in thermal barrier coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1) Prepare according to the designed alkali solution ratio, the masses of NaOH, KOH and deionized water are 100g, 100g and 200g respectively;

[0052] 2) Will figure 1 Place the parts in the high temperature and high pressure reactor, close the reactor and ensure the tightness of the reactor;

[0053] 3) Heat the alkali solution in the reaction kettle, control the heating temperature to 150±5°C, set the magnetic stirring speed to 1000rpm, and turn on the magnetic stirring to ensure the uniformity of the temperature of the alkali solution;

[0054] 4) After the temperature rises to the process temperature of 150±5°C, stop the magnetic stirring, and apply pulse pressure to the reaction kettle. The pulse pressure is set at 10-35MPa, and the pressurization time is controlled to be 30s;

[0055] 5) After the pressurization stops, start magnetic stirring for 30s; after the magnetic stirring ends, pressurize, and when pressurizing, turn off the magnetic stirring; each magneti...

Embodiment 2

[0065] 1) Prepare according to the designed alkali solution ratio, the masses of NaOH, KOH and deionized water are 100g, 500g and 4800g respectively;

[0066] 2) Will Figure 6 Place the parts in the high temperature and high pressure reactor, close the reactor and ensure the tightness of the reactor;

[0067] 3) Heat the alkali solution in the reaction kettle, control the heating temperature to 350±5°C, set the magnetic stirring speed to 2000rpm, and turn on the magnetic stirring to ensure the uniformity of the temperature of the alkali solution;

[0068] 4) After the temperature rises to the process temperature of 350±5°C, stop the magnetic stirring, and carry out pulse pressurization on the reaction kettle. The pulse pressure is set at 75-100MPa, and the pressurization time is controlled at 60s;

[0069] 5) After the pressurization stops, start magnetic stirring for 90s; after the magnetic stirring ends, pressurize, and when pressurizing, turn off the magnetic stirring; ea...

Embodiment 3

[0079] 1) Prepare according to the designed alkali solution ratio, the masses of NaOH, KOH and deionized water are 100g, 300g and 1600g respectively;

[0080] 2) Will figure 1 Place the parts in the high temperature and high pressure reactor, close the reactor and ensure the tightness of the reactor;

[0081] 3) Heat the alkali solution in the reaction kettle, control the heating temperature to 100±5°C, set the magnetic stirring speed to 500rpm, and turn on the magnetic stirring to ensure the uniformity of the temperature of the alkali solution;

[0082] 4) After the temperature rises to the process temperature of 100±5°C, stop the magnetic stirring, and pulse pressurize the reaction kettle. The pulse pressure is set at 36-74MPa, and the pressurization time is controlled at 90s;

[0083] 5) After the pressurization stops, start magnetic stirring for 50s; after the magnetic stirring ends, pressurize, and when pressurizing, turn off the magnetic stirring; each magnetic stirring...

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Abstract

The invention discloses a pressurization alkali-boiling method for removing a ceramic layer in a thermal barrier coating. According to the pressurization alkali-boiling method for removing the ceramiclayer in the thermal barrier coating, alkali liquor is used for removing the ceramic layer in the thermal barrier coating; when the ceramic layer is removed, an alpha-Al2O3 layer on the interface ofthe ceramic layer and a metal layer chemically reacts with an alkali solution under a high temperature and a high pressure, so that the ceramic layer is tripped, damage to the metal bottom layer is avoided, and the metal bottom layer does not need to be repaired, so that the procedures are simple, and re-coating of the ceramic layer is facilitated. The pressurization alkali-boiling method can be implemented conveniently and rapidly, the equipment structure is simple, and operation is easy. Compared with a traditional mechanical sand blasting method, the process parameters can be accurately controlled, and the consistency of the product quality is high. It is found through practice that a ceramic layer of a part treated through the method is completely removed and effectively stripped without damaging a metal layer; and the thickness of the metal bottom layer is not changed before and after the ceramic layer is removed.

Description

【Technical field】 [0001] The invention belongs to the field of repairing ceramic layers of thermal barrier coatings of engine turbine blades, and in particular relates to a pressurized alkali boiling method for removing ceramic layers in thermal barrier coatings. 【Background technique】 [0002] At present, because the electron beam physical vapor deposition (EB-PVD) technology has the advantages of easy and precise control of the chemical composition of the coating, the columnar grain structure can be obtained, and the bonding strength between the coating and the substrate is high, it has been widely used in a variety of high-temperature protective coatings for turbine blades. The preparation and processing of the layer significantly improves the high-temperature oxidation resistance, corrosion resistance and heat insulation performance of the turbine blade, and prolongs the working life of the engine. [0003] However, the ceramic layer of blades with thermal barrier coatin...

Claims

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Application Information

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IPC IPC(8): C23G1/14C23G3/00
CPCC23G1/14C23G3/00
Inventor 王玉锋杨鹏寇录文过月娥赵彦辉张华张鹏刘海浪
Owner AECC AVIATION POWER CO LTD
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