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Processing technology for prolonging service life of thermal barrier coating of gas engine blade

A gas engine and thermal barrier coating technology, which is applied in metal material coating process, coating, fusion spraying, etc., can solve problems such as coating peeling, cracks, thermal barrier coating failure, etc., to delay fracture, increase Large expansion path, to achieve the effect of service life

Inactive Publication Date: 2021-02-19
HANSHAN RONGSHENG MACHINERY CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make up for this deficiency, the method of coating thermal barrier coatings on the surface of metal substrates is generally used in the prior art. For example, China CN2018107985322 discloses an anti-sintering dual-mode composite decoupling strand thermal barrier coating and its preparation process. For example, Chinese patent CN2018103208457 discloses a preparation method of a thermal barrier coating and its thermal barrier coating. The above patent documents all disclose that the thermal barrier coating has the technical effect of improving the thermomechanical fatigue life of the base material, but in actual production and application , with the formation and thickening of thermally grown oxides, the different thicknesses of the thermally grown oxide layer will also cause stress concentration at the coating interface, and the stress concentration will cause cracks in the coating at interface defects. The expansion of the coating tends to cause the coating to peel off, thus making the thermal barrier coating fail

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A processing technology for improving the service life of a thermal barrier coating of a gas engine blade, the specific technology is as follows:

[0018] 1) According to the mass ratio of 1:4, weigh methyldichlorosilane and dimethyldichlorosilane, use a fractionation device to purify, collect the purified fractions, and control the fraction temperature of methyldichlorosilane to 39°C , the fraction temperature of dimethyldichlorosilane is 69°C, and then according to the mass volume ratio of 1:20g / ml, add benzene and the collected fractions to the container, mix well and stir rapidly at 240r / min, and then add benzene at 60ml / ml Feed ammonia gas into the reaction vessel at a flow rate of 1 min. When the pH value of the solution reaches 7.5, reduce the flow rate of ammonia gas to 35ml / min, continue to stir and react at 100r / min for 2h, filter out the white precipitate under nitrogen protection, and pass the filtrate through The precursor is obtained after vacuum distillat...

Embodiment 2

[0025] A processing technology for improving the service life of a thermal barrier coating of a gas engine blade, the specific technology is as follows:

[0026] 1) According to the mass ratio of 1:6, weigh methyldichlorosilane and dimethyldichlorosilane, use a fractionation device to purify, collect the purified fractions, and control the fraction temperature of methyldichlorosilane to 40°C , the fraction temperature of dimethyldichlorosilane is 70°C, and then according to the mass volume ratio of 1:25g / ml, add benzene and the collected fractions to the container, mix well and stir rapidly at 260r / min, and then add benzene at 65ml / ml Feed ammonia gas into the reaction vessel at a flow rate of 1 min. When the pH value of the solution reaches 8.0, reduce the flow rate of ammonia gas to 40ml / min, continue to stir and react at 130r / min for 2.5h, filter out the white precipitate under the protection of nitrogen gas, and filter the filtrate The precursor is obtained after vacuum di...

Embodiment 3

[0033] A processing technology for improving the service life of a thermal barrier coating of a gas engine blade, the specific technology is as follows:

[0034] 1) According to the mass ratio of 1:8, weigh methyldichlorosilane and dimethyldichlorosilane, use a fractionation device to purify, collect the purified fractions, and control the fraction temperature of methyldichlorosilane to 41°C , the fraction temperature of dimethyldichlorosilane is 71°C, and then according to the mass volume ratio of 1:30g / ml, add benzene and the collected fractions to the container, mix well and stir rapidly at 300r / min, and then add benzene at a rate of 70ml / ml The flow rate of min is passed into the reaction vessel with ammonia gas. When the pH value of the solution reaches 8, reduce the flow rate of ammonia gas to 45ml / min, continue to stir and react at 150r / min for 3h, filter out the white precipitate under the protection of nitrogen gas, and pass the filtrate through The precursor is obtai...

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Abstract

The invention discloses a processing technology for prolonging the service life of a thermal barrier coating of a gas engine blade, and relates to the technical field of machining. The processing technology comprises the following specific steps: (1) processing and preparing mixed micro powder A; (2) processing and preparing mixed micro powder B; (3) processing to obtain nano composite particles with a layered structure; and (4) performing sand blasting roughening treatment on a high-temperature alloy matrix after ultrasonic cleaning, evenly mixing the mixed micro powder A, the mixed micro powder B, the nano composite particles and metal bonding layer powder, spraying the surface of the alloy matrix by a plasma spraying technology to form a bottom layer, and then spraying the bottom layerwith nano ceramic powder. According to the processing technology, various micro-powder particles are introduced into a metal bonding layer, so that the generation and expansion of cracks in a thermalgrowth oxide layer are reduced, the integrity of a microstructure of the thermal growth oxide layer is improved, the peeling failure of a ceramic layer is slowed down, and the service life of the thermal barrier coating is prolonged.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a processing technology for improving the service life of a thermal barrier coating of a gas engine blade. Background technique [0002] During the operation of the engine blades, they are subjected to large mechanical stress and undergo rapid changes in gas temperature. Repeated cycles cause the blades to suffer from variable temperature and low cycle fatigue damage, that is, thermomechanical fatigue damage. When the engine is running, the life of the blade is mainly determined by three factors: high temperature creep, thermal fatigue and the surrounding environment. Under high temperature conditions, the centrifugal load generated by the rapid rotation of the blade causes the blade to elongate, which is high-temperature creep; the rapid cooling and heating of the blade during the engine stop, start, acceleration and deceleration process leads to the pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/11C23C4/02
CPCC23C4/02C23C4/073C23C4/11C23C4/134
Inventor 王安
Owner HANSHAN RONGSHENG MACHINERY CASTING
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