NiCrAlY coated YSZ powdered material and coating preparing method

A powder material and coating powder technology, which is applied in the field of laser cladding to prepare thermal barrier coating powder materials, to achieve the effects of high hardness, tight bonding, and high thermal expansion coefficient

Inactive Publication Date: 2017-05-10
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The whole process is placed in a sealed environment

Method used

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  • NiCrAlY coated YSZ powdered material and coating preparing method
  • NiCrAlY coated YSZ powdered material and coating preparing method
  • NiCrAlY coated YSZ powdered material and coating preparing method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] (1) Choose 316 # Steel is used as the substrate for cladding, polished with 600-grit sandpaper, and then cleaned with acetone solution to clean the oil and rust on the surface of the substrate;

[0025] (2) Preset the NiCrAlY coated YSZ powder with 20% mass percentage at 316 # Steel substrate surface, powder thickness 1.5mm;

[0026] (3) Use high-power semiconductor lasers for cladding, where the laser output power is 3000W. The selected spot width is 3-8mm, the overlap ratio is 20%, and the focal length is 370. The scanning speed is 8mm / s, and the protective gas is argon;

example 2

[0028] (1) Choose 316 # Steel is used as the substrate for cladding, polished with 600-grit sandpaper, and then cleaned with acetone solution to clean the oil and rust on the surface of the substrate;

[0029] (2) The NiCrAlY coated YSZ powder of 30% by mass is preset at 316 # Steel substrate surface, powder thickness 1.5mm;

[0030] (3) Use high-power semiconductor lasers for cladding, where the laser output power is 3000W. The selected spot width is 4-8mm, the overlap rate is 20%, and the focal length is 370. The scanning speed is 8mm / s, and the protective gas is argon;

example 3

[0032] (1) Choose 316 # Steel is used as the substrate for cladding, polished with 600-grit sandpaper, and then cleaned with acetone solution to clean the oil and rust on the surface of the substrate;

[0033] (2) The NiCrAlY coated YSZ powder of 30% by mass is preset at 316 # Steel substrate surface, powder thickness 1.5mm;

[0034] (3) Use high-power semiconductor lasers for cladding, where the laser output power is 3000W. The selected spot width is 12-24mm, and the focal length is 370. The scanning speed is 8mm / s, and the protective gas is argon;

[0035] The hardness of the cladding layer obtained in Example 1 is the lowest, and the structure of the cladding layer is poor. The structure of the cladding layer obtained in Example 2 is better, but its average hardness is slightly lower. The cladding layer obtained in Example 3 is excellent both in structure and hardness.

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Abstract

The invention provides a thermal barrier coating preparation technology, and relates to a NiCrAlY coated YSZ thermal barrier coating powdered material preparing method. The method is characterized in that a high pressure water mist method is used for preparing a NiCrAlY alloy coated YSZ thermal barrier coating powdered material, coating powder is arranged on the surface of a high-temperature alloy sample in advanced, the sample is placed in a protection box with argon serving as protective gas, and a ladder bonding layer is prepared through laser wide-band cladding. According to the method, YSZ is coated with laser cladding NiCrAlY, and the ladder bonding layer which can reduce cracks generated by direct cladding of a ceramic layer and a metal base due to different linear expansion coefficients and improve the bonding intensity and thermal shock resistance of the coating.

Description

technical field [0001] The invention belongs to the technical field of preparing thermal barrier coating powder materials by laser cladding, and relates to a preparation process of cermet powder and laser cladding materials. Background technique [0002] With the development of aviation gas turbines in the direction of high flow ratio, high thrust-to-weight ratio, and high turbine inlet temperature, the gas temperature and gas pressure in the combustion chamber continue to increase. For example, the temperature before the turbine of a military engine has reached 1800 ° C, and the combustion chamber temperature is expected to reach 2000 ° C. ~2200℃. Such a high temperature has exceeded the melting point of the existing superalloy, so corresponding measures must be taken. In addition to improving the cooling technology, it is also an effective means to prepare thermal barrier coatings (TBCs) on the surface of the hot end parts of the superalloy. It can It can achieve a heat in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 雷剑波窦俊雅姜伟石川周圣丰顾振杰
Owner TIANJIN POLYTECHNIC UNIV
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